Tag: glaucoma progression monitoring

When Glaucoma Keeps Progressing

Glaucoma can progress even with treatment. The most common reasons include suboptimal IOP control, non-adherence to drops, normal-tension progression, and unrecognised structural risk factors. Finding the cause and adjusting treatment early can prevent further vision loss, says Dr Shibal Bhartiya.

Glaucoma progresses in some patients despite regular treatment. This does not mean the treatment has failed, it means the treatment plan needs review.

Understanding why glaucoma advances is the first step toward stopping it. Several factors can drive progression even when eye pressure appears controlled.

Dr Shibal Bhartiya is a fellowship-trained glaucoma specialist and Mayo Clinic Research Collaborator with over 25 years of experience. Her approach focuses on identifying risk before damage is irreversible, simplifying treatment decisions, and protecting vision long-term. Emphasis on early detection, risk assessment, and continuity of care. She is rated 5 stars across 1,500+ patient reviews on Google.

What Does Progression Mean in Glaucoma?

Progression means measurable worsening of the optic nerve or visual field over time. Specialists confirm it using two or more reliable visual field tests and OCT imaging showing thinning of the retinal nerve fibre layer.

A single abnormal test does not confirm progression. Consistent change across multiple visits does.

Why Glaucoma Progresses Despite Drops

1. Eye Pressure Is Still Too High

The target intraocular pressure (IOP) is individual. A pressure that seems normal may still be too high for a given optic nerve. Studies show that lower IOP targets reduce progression rates in moderate and advanced glaucoma significantly.

If visual fields are worsening, the current pressure target may need revision downward.

2. Drops Are Not Working as Expected

Peak pressure often occurs in the early morning, outside clinic hours. A single office reading may miss harmful pressure spikes. Diurnal IOP curves — tested over several hours — can reveal fluctuations that drive unseen damage.

3. Non-Adherence to Eye Drop Therapy

Studies using electronic monitoring show that patients use drops correctly only 50 to 70 percent of the time. Missing doses, incorrect technique, or preservative intolerance all reduce drug efficacy. Non-adherence is the most correctable cause of progression.

4. Normal-Tension Glaucoma Behaving Differently

Some patients have optic nerve damage at pressures within the normal range. This is normal-tension glaucoma (NTG). It may involve poor vascular supply to the nerve, sleep apnoea, low blood pressure at night, or other systemic factors that drops alone cannot address.

5. Structural Risk Factors Not Yet Addressed

Thin corneas cause IOP readings to appear falsely low. A myopic or tilted optic disc is harder to interpret on imaging. Disc haemorrhages are a strong marker of ongoing progression and must be documented carefully.

6. Systemic Factors Affecting the Optic Nerve

Low systolic blood pressure, anaemia, sleep apnoea, and vascular disorders can reduce blood flow to the optic nerve. Treating these conditions alongside glaucoma can slow visual field loss in susceptible patients.

Reason for ProgressionWhat It MeansNext Step
IOP target not low enoughNerve still under excess pressureLower target IOP or add therapy
Pressure spikes between visitsDiurnal fluctuation causing damageDiurnal IOP curve or 24-hour monitoring
Drop non-adherenceInconsistent pressure loweringTechnique review, preserve-free drops, fixed combos
Normal-tension glaucomaVascular or non-pressure mechanismSystemic workup, cardiology review
Thin cornea or high myopiaIOP underestimated by tonometryCorneal-corrected IOP, adjusted targets
Disc haemorrhageActive ischaemia at optic nerveClose follow-up, often signals rapid progression
Systemic comorbidityPoor vascular supply to nerveTreat sleep apnoea, anaemia, hypotension

When to Consider Laser or Surgery

If maximum tolerated medical therapy does not achieve the revised IOP target, laser trabeculoplasty (SLT) or surgery becomes necessary. Selective laser trabeculoplasty is effective in open-angle glaucoma and can reduce the drop burden significantly.

Minimally invasive glaucoma surgery (MIGS) procedures such as iStent and iStent inject offer an option for mild to moderate glaucoma with lower surgical risk. Trabeculectomy remains the benchmark for advanced disease requiring very low pressures.

Dr Shibal Bhartiya’s published research includes peer-reviewed work on 24-hour IOP monitoring and diurnal pressure fluctuation: one of the most under-recognised drivers of progression in treated glaucoma. She has co-authored guidelines on surgical decision-making when medical therapy fails to halt optic nerve damage. As Clinical Director of Ophthalmology at Marengo Asia Hospitals, Gurugram, she manages complex progression cases with a structured protocol: reassess the IOP target, confirm adherence, evaluate vascular and systemic risk, and escalate to laser or surgery when the nerve continues to lose ground.

How Often Should You Be Reviewed?

Patients with progressing glaucoma need more frequent review — often every three to four months. Visual fields should be repeated at least four times a year if progression is suspected. OCT of the optic nerve head and RNFL should accompany each visit.

Waiting six or twelve months between visits when progression is active is not safe practice.

The Role of a Second Opinion

Glaucoma management decisions are complex. If your visual fields continue to worsen, a second opinion from a fellowship-trained glaucoma specialist adds value. Fresh eyes on your imaging, IOP pattern, and structural data can identify a missed cause.

Bringing your previous visual fields, OCT scans, and medication list to the consultation helps the specialist assess the rate of change accurately.

Known for her structured approach to glaucoma risk assessment and progression analysis, Dr Shibal Bhartiya provides trusted second opinions for patients seeking clarity before major treatment decisions. Both, in person, and online.

Frequently Asked Questions

Can glaucoma progress even with normal eye pressure?

Yes. Normal-tension glaucoma progresses at IOP readings within the statistical normal range. The optic nerve in these patients is more sensitive to pressure or more dependent on blood supply. Treatment often involves additional systemic assessment alongside IOP lowering.

How do I know if my glaucoma is progressing?

Your specialist tracks visual field tests and OCT scans over time. Progression is confirmed when two or more reliable tests show consistent worsening. You may not notice early progression — which is why regular monitoring matters.

What pressure should I aim for if my glaucoma is progressing?

The target varies by disease severity and rate of progression. Advanced or rapidly progressing glaucoma typically requires a target below 12 mmHg. Your specialist calculates this based on your structural damage and life expectancy.

Are there lifestyle changes that help slow progression?

Regular aerobic exercise, avoiding head-down positions such as headstands, good sleep hygiene, and managing vascular risk factors all support optic nerve health. Omega-3 supplementation and antioxidant nutrition are areas of ongoing research.

Is surgery the only option if drops stop working?

Not always. Selective laser trabeculoplasty is a non-incisional option that works well in many patients. If laser is not sufficient, MIGS procedures offer a middle path between drops and conventional surgery.

Consult a Glaucoma Specialist

If your glaucoma is progressing despite treatment, you need a specialist review, not just a medication change. The cause must be identified before the right intervention can be chosen.

About the Author

This article was written by Dr Shibal Bhartiya, fellowship-trained glaucoma specialist and Mayo Clinic Research Collaborator, Clinical Director at Marengo Asia Hospitals, Gurugram, known for ethical, patient-centred glaucoma care and independent glaucoma second opinions. She is also the Program Director for Community Outreach & Wellness; and for the Marengo Asia International Institute of Neuro and Spine. This article was updated in May 2026.

She has published peer-reviewed research on glaucoma management, examining how treatment decisions should balance medical evidence, patient preferences, and long-term vision outcomes.

As Editor-in-Chief of Clinical and Experimental Vision and Eye Research and Executive Editor of the Journal of Current Glaucoma Practice (Pubmed Indexed, official journal of the International Society of Glaucoma Surgery), Dr Shibal Bhartiya brings editorial and research depth to every clinical decision. Her 200+ publications, including 90+ PubMed-indexed publications and 28 edited textbooks span glaucoma biology, surgical outcomes, health equity, and emerging diagnostics.

Access her work on Pubmed, Google Scholar, ResearchGate and ORCID.

Dr Shibal Bhartiya
Glaucoma • Second Opinion • Advanced Care

www.drshibalbhartiya.com
 +91 88826 38735

1500+ Five Star Patient Reviews Google Business Profile

Upload your reports for a structured review.

If you are unable to come to Dr Bhartiya’s clinic: Read more about teleconsultation for glaucoma

Related Reading

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Visual Field and OCT: Structure & Function Correlation

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Risk Stratification in Glaucoma

Glaucoma Progression: What It Means and How to Slow It

Glaucoma treatment in Gurgaon

All About Glaucoma Medication

Glaucoma Lasers: SLT & LPI

Glaucoma surgery in Gurgaon

MIGS in Gurgaon

Get a Glaucoma Second Opinion in Gurgaon

Glaucoma in India: Why the Risk Is Higher Than You Think

Glaucoma is the most common cause of irreversible blindness in India, and 90% of cases remain undiagnosed. That means nine out of every ten people with glaucoma in this country do not know they have it. An estimated 11.2 million Indians aged 40 and above have glaucoma. And angle closure glaucoma is more common in India, than in the West, says Dr Shibal Bhartiya. Glaucoma in India is often missed or undertreated because it progresses silently, even when vision and eye pressure appear normal. Good glaucoma care focuses on early detection, risk-based monitoring, and long-term protection of vision, not just adding more eye drops.

Glaucoma does not give you a warning. You lose peripheral vision first. By the time you notice something is wrong, damage is already done. The good news is that glaucoma detected early is highly manageable. Blindness from glaucoma is largely preventable with timely diagnosis and consistent treatment.

In India, this story plays out every day at a scale that is hard to comprehend. Dr Shibal Bhartiya, fellowship trained glaucoma specialist in Gurgaon, explains more about Glaucoma in India, and Indians.

Dr Shibal Bhartiya is a fellowship-trained glaucoma specialist and Mayo Clinic Research Collaborator with over 25 years of experience. Her approach focuses on identifying risk before damage is irreversible, simplifying treatment decisions, and protecting vision long-term. Emphasis on early detection, risk assessment, and continuity of care. She is rated 5 stars across 1,500+ patient reviews on Google.

Why Indians Are at Higher Risk

Indians carry specific anatomical and genetic traits that raise their glaucoma risk. One of the most significant is a shallower anterior chamber angle. This makes angle-closure glaucoma far more common in Indian and South Asian eyes than in Western populations.

Primary angle-closure disease may affect as many as 27.6 million Indians. Patients with primary angle-closure glaucoma are twice as likely to go blind compared to those with open-angle glaucoma. Yet this form is frequently missed or misdiagnosed.

Indians also present with glaucoma at a younger age than patients in Western populations. Juvenile open-angle glaucoma, which begins between the ages of 16 and 40, is well documented in Indian tertiary centre data. A family history of glaucoma raises your personal risk significantly. If a parent or sibling has glaucoma, your chances of developing it are much higher.

Other risk factors specific to the Indian context include:

Steroid use without medical supervision, myopia (short-sightedness), diabetes, and a family history of glaucoma are all important risk factors to discuss with your doctor.

The Problem of Late Presentation

Most glaucoma in India is detected late. Very late.

In India, undetected and untreated glaucoma leads to faster progression, earlier visual impairment, and preventable blindness. The core reason is that glaucoma causes no pain and no blur in the early stages. People feel completely fine. They see no reason to visit an eye doctor.

By the time central vision is affected, up to 90% of peripheral nerve fibres may already be lost. That damage cannot be reversed. No surgery, no medication, and no intervention brings that vision back.

This is what makes early screening so critical. You cannot feel glaucoma coming. You can only catch it on examination.

The Scale of the Problem in India

Glaucoma prevalence among Indians aged 40 and above ranges between 2.7% and 4.3% across multiple population-based studies. In those over 70 years of age, the risk rises sharply. Studies show glaucoma affects over 8% of Indians in their seventies and over 14% of those above 80.

Glaucoma is a leading cause of irreversible blindness globally, and the burden in Asia and India is expected to grow substantially by 2040.

India does not have enough glaucoma specialists to manage this burden. Most patients are diagnosed and managed by general ophthalmologists. Structured, specialist-led care makes a real difference to outcomes.

What Makes Glaucoma in Indians Different to Manage

Treating glaucoma in an Indian patient requires a different approach than using a standard Western protocol.

Indian eyes tend to have thinner corneas. Corneal thickness affects how accurately we measure intraocular pressure (IOP). A thin cornea can make the pressure appear lower than it actually is. This leads to underdiagnosis and undertreatment. Also, thinner corneas are an independent risk factor for glaucoma progression.

Angle-closure disease needs gonioscopy, a specialised examination to assess the drainage angle of the eye. Studies have found that a significant proportion of patients in India are incorrectly treated for open-angle glaucoma when they actually have angle-closure disease.The treatment for these two types is fundamentally different.

Normal tension glaucoma (NTG), where optic nerve damage occurs despite normal eye pressure, is also seen in Indian patients. This form requires looking beyond IOP and addressing other risk factors including blood pressure, sleep patterns, and vascular health.

How I Approach Glaucoma in Indian Patients

I have spent 25+ years specialising in glaucoma. I see this disease in its full Indian context, not through a textbook written for another population.

My clinical approach includes a full angle assessment with gonioscopy for every new patient, corneal thickness measurement to ensure accurate pressure readings, structural imaging with OCT to detect early nerve fibre loss, visual field analysis (with special emphasis on reliability criteria) and a detailed risk factor review including family history, steroid use, and systemic health.

Correct classification, open-angle versus angle-closure, changes treatment completely. Getting this right at the first visit prevents years of inadequate care.

I also believe in clear communication. Glaucoma is a lifelong condition. You need to understand what you have, why treatment matters, and what to monitor. I take the time to explain this at every visit.

If you have a family history of glaucoma, are over 40, have diabetes, are short-sighted, or use steroid eye drops, you need a glaucoma screening now.

Clinical Reality (What’s Not Always Obvious in Glaucoma Care in India)

  • Normal vision does not mean no glaucoma
    Many patients read 6/6 and still have significant optic nerve damage.
  • Symptoms are often absent until late
    Glaucoma is typically silent — by the time patients notice vision loss, it is often irreversible.
  • Eye pressure (IOP) alone is not enough
    Patients can progress despite “normal” pressures — especially in normal-tension glaucoma, which is common in India.
  • Tests in isolation can mislead
    A single OCT or visual field report cannot define disease. Progression over time is what matters.
  • Cataract and glaucoma often coexist — but are not interchangeable explanations
    Improving vision after cataract surgery does not mean glaucoma risk is gone.
  • More medications ≠ better control
    Multiple drops without a clear long-term plan often reflect escalation without strategy.
  • Follow-up gaps are a major cause of vision loss
    Irregular monitoring is one of the biggest real-world failures in glaucoma care.
  • Family history is under-recognised and under-screened
    Many high-risk individuals in India are never examined until damage has already occurred.

What Good Glaucoma Care Looks Like (Indian Context)

  • Early risk identification — even before symptoms
    Screening is guided by age, family history, corneal thickness, optic nerve appearance — not just complaints.
  • Baseline documentation and longitudinal tracking
    OCT and visual fields are used to establish a baseline and detect change, not just diagnose once.
  • Target pressure is individualised
    Treatment is tailored based on stage of disease, risk profile, and rate of progression — not a fixed number.
  • Medication strategy is structured, not reactive
    Each drop has a purpose. Escalation is thoughtful, not additive.
  • Patient understanding is prioritised
    Patients are told what to watch for: subtle visual changes, adherence issues, side effects.
  • Consistency over intensity
    Regular follow-up (every 3–6 months depending on risk) matters more than aggressive but irregular care.
  • Second opinions are used appropriately
    Especially when:
    • Disease is progressing despite treatment
    • Multiple medications are being used
    • Surgery is being considered
  • The goal is not just seeing clearly — but seeing safely for life
    Glaucoma care is long-term risk management, not short-term vision correction.

Remember

SituationWhat Patients Often AssumeClinical Reality (India Context)What Good Care Looks Like
Vision is normal“I can see clearly, so everything is fine”Glaucoma can cause optic nerve damage even with 6/6 visionRisk-based screening and optic nerve evaluation, even without symptoms
No symptoms“No discomfort means no disease”Glaucoma is silent until late stagesEarly detection through structured exams, not symptom-driven visits
Eye pressure (IOP)“My pressure is normal, so I’m safe”Progression can occur even at normal IOP (common in India)Individualised target IOP based on risk and progression
Single test reports“My OCT/field test is normal”One report is not enough — change over time mattersBaseline + serial comparison to detect progression
Cataract vs glaucoma“Cataract surgery fixed my vision, so I’m okay”Cataract improvement can mask underlying glaucomaParallel evaluation of optic nerve even in cataract patients
Multiple eye drops“More drops means stronger treatment”Overmedication may reflect lack of strategyStructured medication plan with defined goals
Follow-up gaps“I’ll come back if I feel a problem”Irregular follow-up is a major cause of preventable vision lossScheduled monitoring every 3–6 months based on risk
Family history“No one told me to get checked”High-risk individuals often remain unscreened in IndiaProactive screening for family members
Treatment approach“Doctor will adjust if needed”Reactive care often misses slow progressionLong-term planning with defined targets and timelines
Understanding disease“Drops are enough”Poor understanding leads to poor adherenceClear patient education on disease, risks, and expectations
Escalation decisions“Add another drop if pressure rises”Escalation without strategy leads to confusion and side effectsStepwise, purpose-driven escalation or de-escalation
Goal of care“I just need to see clearly”Vision clarity ≠ visual safetyFocus on lifelong preservation of functional vision

FAQs: Glaucoma in Indians

Is glaucoma more common in Indians?

Yes. Indians face a higher risk than many Western populations for two main reasons. First, Indian eyes tend to have a shallower drainage angle, which makes angle-closure glaucoma significantly more common. Second, glaucoma in Indians often develops at a younger age and is detected later, by which time substantial nerve damage has already occurred.

Can Indians get glaucoma even with normal eye pressure?

Yes. Normal tension glaucoma (NTG) occurs when the optic nerve is damaged despite intraocular pressure readings within the normal range. This form is well documented in Indian patients. It is one reason why pressure measurement alone is not enough. A full glaucoma evaluation includes optic nerve imaging and visual field testing.

What are the early signs of glaucoma in Indians?

In most cases, there are no early signs. Glaucoma is called the silent thief of sight because it causes no pain and no blurred vision until the disease is advanced. Peripheral vision goes first, and most people do not notice this until significant damage has occurred. The only reliable way to detect early glaucoma is a comprehensive eye examination.

Who should get screened for glaucoma in India?

Anyone over 40 should have a baseline glaucoma check. Screening is especially important if you have a family history of glaucoma, are short-sighted, have diabetes, use steroid eye drops, or have previously been told your eye pressure is elevated. Earlier screening is recommended if more than one risk factor applies.

How is glaucoma treated in Indian patients?

Treatment depends on the type of glaucoma. Angle-closure glaucoma, which is more common in Indians, often requires laser treatment (laser peripheral iridotomy) in addition to or instead of eye drops. Open-angle glaucoma is typically managed with pressure-lowering drops, laser, or surgery. The right treatment must be matched to the specific type of glaucoma you have, which is why correct diagnosis through gonioscopy and full assessment is essential.

If you have been told you have glaucoma but have not had gonioscopy or a visual field or OCT imaging, a structured second opinion can clarify your diagnosis and treatment plan.

Book a consultation with Dr Shibal Bhartiya:

Marengo Asia Hospitals, Gurugram

Phone: +91 88826 38735

Website: drshibalbhartiya.com

Google Business Profile: maps.app.goo.gl/mcfegmHTuhqV5hSp6

Read the research articles

Read the research articles

This article was written by Dr Shibal Bhartiya, fellowship-trained glaucoma specialist and Mayo Clinic Research Collaborator, Clinical Director at Marengo Asia Hospitals, Gurugram, known for ethical, patient-centred glaucoma care and independent glaucoma second opinions. This article was updated in May 2026.

She has published peer-reviewed research on glaucoma management, examining how treatment decisions should balance medical evidence, patient preferences, and long-term vision outcomes.

As Editor-in-Chief of Clinical and Experimental Vision and Eye Research and Executive Editor of the Journal of Current Glaucoma Practice (Pubmed Indexed, official journal of the International Society of Glaucoma Surgery), Dr Shibal Bhartiya brings editorial and research depth to every clinical decision. Her 200+ publications, including 90+ PubMed-indexed publications and 28 edited textbooks, span glaucoma biology, surgical outcomes, health equity, and emerging diagnostics.

Available on Pubmed and Google Scholar

Dr Shibal Bhartiya
Glaucoma • Second Opinion • Advanced Care

www.drshibalbhartiya.com
 +91 88826 38735

Patient reviews Google Business Profile

Upload your reports for a structured review.

If you are unable to come to Dr Bhartiya’s clinic: Read more about teleconsultation for glaucoma

Glaucoma AI Detection: Does it Save Sight?

Posted on by Dr Shibal Bhartiya

AI can now detect glaucoma from a fundus photograph with a sensitivity of over 90% — but the more important…

Glaucoma Diagnosis in Gurgaon

Glaucoma Diagnosis in Gurgaon: What to expect

Glaucoma steals vision silently. Most patients feel no pain and notice no changes, until significant nerve damage has already occurred.

Early diagnosis changes everything. In, Gurgaon, Dr. Shibal Bhartiya offers a complete glaucoma diagnostic workup using advanced imaging and functional testing.

If you have a family history of glaucoma, are over 40, or have been told your eye pressure is high, this page explains exactly what your evaluation involves.

Why Early Glaucoma Detection Matters

Vision lost to glaucoma cannot come back. But when you catch it early, treatment halts further damage. That is why a thorough diagnostic evaluation is essential, not optional.

Early detection matters most if you have:

💡 Research shows that South Asians have a higher risk of angle-closure glaucoma. A screening examination can identify this risk before any symptoms appear.

7 Tests Used to Diagnose Glaucoma

Dr Shibal Bhartiya is a fellowship-trained glaucoma specialist and Mayo Clinic Research Collaborator with over 25 years of experience. Her approach focuses on identifying risk before damage is irreversible, simplifying treatment decisions, and protecting vision long-term. Emphasis on early detection, risk assessment, and continuity of care. She is rated 5 stars across 1,500+ patient reviews on Google.

Dr. Bhartiya uses a structured, evidence-based protocol. Each test answers a different question about the health of your optic nerve and visual system.

1. Intraocular Pressure (IOP) Measurement

High eye pressure is the most well-known glaucoma risk factor. Dr. Bhartiya measures IOP using Goldmann applanation tonometry, the gold-standard technique.

Normal IOP: 10–21 mmHg. Readings above this range trigger further evaluation. However, some patients develop glaucoma at normal pressures (normal-tension glaucoma), so IOP alone is never enough.

The test is quick and painless. It takes less than a minute per eye.

💡 IOP fluctuates through the day. Dr. Bhartiya may check your pressure at different times if she suspects normal-tension glaucoma.

2. OCT- Optic Nerve and RNFL Imaging

Optical Coherence Tomography (OCT) is the most important advance in modern glaucoma diagnosis. It gives Dr. Bhartiya a detailed cross-sectional scan of your optic nerve and retinal nerve fibre layer (RNFL).

OCT detects structural nerve damage up to 6 years before visual field loss becomes visible. This makes it the cornerstone of early detection.

OCT measures:

  • RNFL thickness, thinning here signals glaucoma damage
  • Optic nerve head parameters, including the cup-to-disc ratio
  • Ganglion cell complex, a sensitive early marker of nerve loss

The scan is non-contact, takes about 5 minutes, and requires no eye drops in most cases.

💡 Dr. Bhartiya’s research background in optic nerve imaging means she reads OCT results with particular depth, looking beyond the machine’s colour codes and interpreting the raw data.

3. Visual Field Testing (Perimetry)

Glaucoma damages peripheral vision first. A visual field test maps exactly which parts of your vision are affected, and how severely. You sit in front of a dome-shaped screen and press a button each time you see a light flash. The test takes 5–7 minutes per eye.

Visual field testing answers three questions:

  • Is there functional vision loss,  and where?
  • How fast is the damage progressing?
  • Is current treatment working?

Results compare against age-matched norms. Serial testing over time is especially important, a single test shows the current state; repeated tests reveal the trend.

💡 Reliable results require full concentration. Bhartiya’s team explains the test carefully so your first attempt is accurate. But if there are too many false positives or negatives, they will request a repeat!

4. Corneal Pachymetry

Pachymetry measures the thickness of your cornea. This single measurement significantly changes how Dr. Bhartiya interprets your eye pressure.

Here is why. IOP measurements are affected by corneal thickness. A thin cornea makes pressure read falsely low. A thick cornea makes it read falsely high.

Average corneal thickness: ~545 microns. Corneas below 500 microns carry a significantly higher risk of glaucoma progression, even when IOP appears normal.

The test is painless and takes under 2 minutes. A small probe touches the cornea gently after numbing drops.

💡 Pachymetry is especially important if glaucoma is progressing despite treatment, and for patients with borderline IOP readings.

5. Gonioscopy: Examining the Drainage Angle

Gonioscopy is the only way to directly examine the drainage angle of the eye, where fluid exits. This examination determines whether your glaucoma is open-angle or angle-closure. That distinction drives every treatment decision.

Dr. Bhartiya places a specialised mirrored lens gently on your eye (after numbing drops) to visualise structures that are otherwise invisible.

Gonioscopy reveals:

💡 Many patients in India have narrow drainage angles without knowing it. Gonioscopy at your first visit can prevent a potentially blinding acute angle-closure attack.

6. Diurnal IOP Monitoring and the Water Drinking Test

Eye pressure is not constant. It fluctuates throughout the day and night, typically peaking around 4 AM and varying by as much as 6–8 mmHg over 24 hours. A single pressure reading in clinic captures only one moment in that cycle.

This matters because peak IOP, not average IOP, is what damages the optic nerve. A patient whose pressure appears well-controlled at a morning clinic visit may have dangerously high peaks overnight.

24-hour IOP monitoring records pressure every two hours over a full day and night. It is the most comprehensive method but is cumbersome and expensive. It is reserved for complex cases where standard clinic measurements are insufficient.

The Water Drinking Test is a practical alternative. Eye pressure is measured at baseline, then you drink approximately 10 ml per kg body weight of water over five minutes. Pressure is then recorded every 15 minutes for one hour. The test gives a reasonable estimate of peak IOP, pressure fluctuation, and how quickly your eye recovers to baseline.

If a water drinking test has been scheduled, carry a one-litre bottle of water. There are no other specific preparations.

💡 Dr Bhartiya has published peer-reviewed research on 24-hour IOP monitoring, target IOP, and continuous pressure recording in glaucoma patients. This is an area of active clinical research at this practice.

7. Optic Disc Photography

A high-resolution photograph of your optic nerve is taken and stored in your record. This image becomes one of the most important documents in your long-term glaucoma care.

The reason is straightforward. Glaucoma causes slow, progressive changes to the optic disc — changes that are often difficult to detect at any single visit. A photograph taken today gives your doctor a precise baseline to compare against at every future visit. Subtle changes that would otherwise go unnoticed become visible when images from different years are placed side by side.

Disc photography requires no drops in most cases. You sit in front of a fundus camera, look at a fixation target, and a bright flash takes the image. It takes under two minutes.

💡 Serial disc photography over years is one of the most powerful tools for detecting glaucoma progression — and one of the most underused in routine practice.

What to Expect at Your Glaucoma Evaluation

A complete glaucoma workup takes approximately 60–90 minutes. Here is the sequence:

  1. Brief history: symptoms, family history, current medications
  2. Visual acuity and refraction
  3. IOP measurement (both eyes)
  4. Pachymetry
  5. Gonioscopy
  6. Dilated fundus examination and optic nerve evaluation
  7. OCT imaging
  8. Visual field testing (where indicated)
  9. Detailed consultation: results, diagnosis, and treatment options

Dilation drops may be used during the examination. Your vision may be blurred for 3–4 hours afterwards. Plan not to drive yourself home.

Seeking a Second Opinion on Glaucoma?

Many patients come to Dr. Bhartiya after receiving a diagnosis elsewhere, unsure whether they need surgery, or concerned about a treatment recommendation.

A second opinion review includes a full re-evaluation of all existing tests, a fresh examination, and an honest, unhurried discussion of your options. Dr. Bhartiya brings her research expertise to every such case.

💡 Bring all previous reports, OCT scans, visual field printouts, and prescription history. The more information you bring, the more specific the guidance.

Book Your Glaucoma Diagnosis in Gurgaon

Do not wait for symptoms. Glaucoma gives no warning until significant damage is done.

Book a comprehensive glaucoma evaluation with Dr. Shibal Bhartiya at Gurgaon.

📞  Call or WhatsApp: +91 8882638735

🔗  Also read: Glaucoma Surgery in Gurgaon  |  Glaucoma Second Opinion  |  About Dr. Shibal Bhartiya

Frequently Asked Questions

Is glaucoma diagnosis painful?

No. All five tests are painless. IOP measurement, OCT, and visual field testing involve no contact with the eye. Pachymetry and gonioscopy use numbing drops first, so you feel minimal discomfort.

How often should I get screened?

If you have risk factors — family history, high eye pressure, thin corneas, or age over 40 — annual screening is advisable. For diagnosed patients, Dr. Bhartiya sets a personalised review schedule based on disease stage and stability.

My eye pressure is normal. Can I still have glaucoma?

Yes. Normal-tension glaucoma is well-recognised and common in Asian populations. Dr. Bhartiya evaluates optic nerve structure and visual function alongside IOP — because pressure alone does not tell the whole story.

Can glaucoma be detected before symptoms appear?

Yes, and this is the entire point of a diagnostic evaluation. OCT detects structural nerve damage years before you notice any visual change. Early detection is the single most important factor in protecting your long-term vision.

What is the difference between open-angle and angle-closure glaucoma?

Open-angle glaucoma develops slowly and painlessly as drainage channels lose efficiency over time. Angle-closure glaucoma occurs when the drainage angle narrows or blocks — it can cause sudden pain, redness, and rapid vision loss. Gonioscopy distinguishes between the two and guides treatment.

How long does the full diagnostic evaluation take?

Approximately 60–90 minutes for a first-visit comprehensive workup. Follow-up visits for monitoring are usually shorter, 30–45 minutes.

How should I prepare for my glaucoma tests?

No specific preparation is needed. A few things will help:

Read a little about glaucoma beforehand and write down any questions you want to ask. Get a good night’s sleep before your visual field test, fatigue significantly affects results. Have a light meal before you arrive, as some tests take time. Continue all previously prescribed medications unless told otherwise.

If a water drinking test has been scheduled, carry a one-litre bottle of water. If dilation has been planned, arrange for someone to drive you home, your vision may be blurred for 3–4 hours after dilating drops. Bring something to read while you wait. Glaucoma investigations are painless, but they are time-consuming.

I have been advised gonioscopy. What does it involve?

Gonioscopy is used to examine the drainage angle of your eye, the area where fluid exits. It determines whether your glaucoma is open-angle or angle-closure, which drives every treatment decision.

Your doctor will apply numbing drops first, so the procedure is painless. A small mirrored lens is then placed gently on the eye. You will be asked to look in a specific direction while the doctor examines the angle with the slit lamp. The room lights are usually dimmed for better visibility.

Most people tolerate gonioscopy well. Occasionally, the procedure stimulates the vagus nerve and causes brief dizziness, this passes quickly. The whole examination takes a few minutes.

The visual field test sounds difficult. Any tips?

It is one of the harder tests to do well, but a few things help.

You will sit in front of a dome-shaped screen and press a button each time you see a flash of light. Keep looking at the central fixation light throughout, do not track the flashes. Press the button even if you are only partially sure you saw something.

Pace yourself. If you feel fatigued, tell the operator and take a break. If your eyes feel dry, blink or use your lubricant drops before continuing. Do not rush, pressing quickly to finish the test produces unreliable results and may mean you need to repeat it.

There is a learning curve. Your doctor may ask you to repeat the test at a subsequent visit, this is normal and not a cause for concern.

How is eye pressure measured?

The standard method is Goldmann applanation tonometry. Your doctor applies numbing drops and a small amount of orange dye, then brings a probe into gentle contact with the cornea. The test is painless and takes under a minute per eye.

Some clinics use a non-contact tonometer, the air-puff machine, which requires no drops and no contact. Both methods are accurate when performed correctly.

How does the doctor examine my optic nerve?

The optic nerve sits at the back of the eye and cannot be seen without special equipment. Your doctor will use one of two methods: an ophthalmoscope (a handheld light and lens), or a high-powered lens at the slit lamp. Dilating drops are often used to widen the pupil and allow a clearer view.

What the doctor looks for is the size and shape of the optic cup relative to the disc (the cup-to-disc ratio), the colour and rim tissue of the nerve, and any asymmetry between the two eyes. These findings, combined with OCT and visual field data, form the basis of diagnosis.

Read the research articles

This article was written by Dr Shibal Bhartiya, fellowship-trained glaucoma specialist and Mayo Clinic Research Collaborator, Clinical Director at Marengo Asia Hospitals, Gurugram, known for ethical, patient-centred glaucoma care and independent glaucoma second opinions. This article was edited in April 2026.

She has published peer-reviewed research on glaucoma management, examining how treatment decisions should balance medical evidence, patient preferences, and long-term vision outcomes.

As Editor-in-Chief of Clinical and Experimental Vision and Eye Research and Executive Editor of the Journal of Current Glaucoma Practice (Pubmed Indexed, official journal of the International Society of Glaucoma Surgery), Dr Shibal Bhartiya brings editorial and research depth to every clinical decision. Her 200+ publications, including 90+ PubMed-indexed publications and 28 edited textbooks span glaucoma biology, surgical outcomes, health equity, and emerging diagnostics.

Available on Pubmed and Google Scholar

Dr Shibal Bhartiya
Glaucoma • Second Opinion • Advanced Care

www.drshibalbhartiya.com
+91 88826 38735

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