Tag: narrow angle glaucoma

Why Do I Need a Gonioscopy in Gurgaon?

You need gonioscopy when your doctor must see your eye’s drainage angle directly, to tell open-angle from angle-closure glaucoma. In Gurgaon, I do this five-minute test in a dimmed room, so a narrow angle is not missed.

Your doctor has said you need a gonioscopy. The name sounds alarming, and few people explain it well. It is a short, painless test. It answers one question: is your drainage angle open, narrow, or closed?

What is gonioscopy?

Your eye makes fluid all day. That fluid leaves through a narrow drainage angle between the iris and the cornea. Gonioscopy places a small mirrored lens on the eye’s surface and shows this angle directly. The angle stays hidden from the usual slit-lamp view.

Gonioscopy remains the gold standard for classifying glaucoma. It decides whether your treatment is drops, laser, or urgent care.

Why do you need a gonioscopy?

  • You have a shallow front chamber or a narrow angle. I need to check the angle directly.
  • You have glaucoma, or doctors suspect it. The test tells us whether your angle is open, narrow, or closed.
  • Angle closure runs in your family. Narrow angles often run in families.
  • You have had an eye injury. Trauma can scar the angle. This is called angle recession.
  • You have diabetic eye disease. New blood vessels can grow into the angle.
  • You are planning an ICL. A baseline gonioscopy comes before implant surgery.
  • You take medicines that can trigger angle closure. I may check your angle before you start or continue them.

How I do gonioscopy in Gurgaon

Technique changes the result. Two examiners can grade the same angle differently.

I dim the room lights. Bright light shrinks the pupil. A small pupil pulls the iris away from the angle. A narrow angle can then look falsely open. Dim light keeps the pupil near its natural size. This matches the conditions that trigger angle closure, such as a dark cinema or dusk.

I use dynamic (indentation) gonioscopy where needed. I press the lens gently to tell true closure from appositional closure. This decides whether you need a laser iridotomy, monitoring, or nothing.

I do the test myself. I perform gonioscopy on nearly every glaucoma or glaucoma-suspect patient I see.

What your angle finding means

Angle findingWhat it meansWhat usually happens next
OpenThe drainage channel is clear. If you have glaucoma, it is open-angle.Drops, laser, or surgery to lower pressure over time.
Narrow (occludable)The channel may close, even if it has not yet.Prevent an attack, often with a laser iridotomy.
ClosedThe channel is blocked. This needs prompt treatment.Treatment to protect your vision, planned by urgency.
Other findingsPigment, scarring (synechiae) or abnormal vessels.These point to pigment dispersion, past trauma or diabetic changes. Your plan changes.

I also grade your angle, for example with the Shaffer system. This lets us track changes over time.

Is gonioscopy painful, and what happens during the test?

No, gonioscopy is not painful, but you may feel a little pressure on the eye. Your eye is numbed with anaesthetic drops, so the test itself doesn’t hurt.

  1. I explain the test and answer your questions.
  2. Numbing drops go into your eyes.
  3. A little gel goes on the lens. It feels like ultrasound gel.
  4. I rest the lens gently on your eye.
  5. You look straight ahead, then in other directions.
  6. I view your angle through the microscope.
  7. I help you clean your eyes.

Your vision may stay blurry for 15 to 20 minutes. This clears on its own. Rarely, the test causes brief dizziness. It passes quickly.

Gonioscopy vs. Anterior Segment OCT (AS-OCT)

While Anterior Segment OCT (AS-OCT) offers an objective, non-contact, high-resolution cross-sectional scan of the anterior chamber angle—making it an excellent, non-invasive imaging tool for documentation and screening—gonioscopy remains the indispensable clinical gold standard for glaucoma diagnosis. AS-OCT captures a static image in dark or light conditions, but it cannot differentiate between appositional contact and true permanent scarring (peripheral anterior synechiae, or PAS), nor can it visualize critical pigmentary details, pseudoexfoliation deposits, neovascularization, or angle recession. Remember, AS-OCT is not the same as RNFL- OCT

Gonioscopy uniquely allows the clinician to perform dynamic indentation (compression), gently applying pressure through the mirrored lens to physically test whether a closed drainage angle can be reopened or is permanently scarred shut—a critical distinction that directly determines whether a patient requires preventive laser peripheral iridotomy (LPI), medical therapy, or surgical intervention.

How to prepare for gonioscopy in Gurgaon

You need very little preparation.

  • Continue your regular eye drops.
  • Remove contact lenses before your visit, if possible, or just before the test.
  • Bring earlier eye reports.
  • Bring someone to drive you, if you prefer.

When to see a doctor

See a doctor urgently

Go the same day if you have:

  • Sudden eye pain with a red eye
  • Halos around lights
  • Sudden blurred vision
  • Severe headache with nausea or vomiting

These can signal an acute angle-closure attack. Do not wait for an appointment.

See a doctor

Book a visit if you:

  • Have a shallow front chamber or a narrow angle on record
  • Have a family history of angle closure
  • Have glaucoma and have never had gonioscopy
  • Are planning ICL surgery
  • Have had an eye injury

What this means for you

Gonioscopy is a five-minute test, that just doesn’t just confirm glaucoma. It decides which kind you have, and that decision determines whether your treatment is drops, an elective laser, or urgent intervention.

Why is Gonioscopy Important?

Gonioscopy is an eye test that visualises the drainage angle of the eye. This drainage angle is responsible for maintaining the eye pressure. Gonioscopy determines if the glaucoma is open angle, or angle closure. It’s findings depend heavily on room lighting and examiner technique. A gonioscopy done under bright slit-lamp illumination can make a narrow angle look falsely open. This is because light constricts the pupil and pulls the iris away from the drainage angle. In Gurgaon, I perform gonioscopy in a dimmed room specifically to avoid this artifact. This way, the angle is graded at its true, physiologic width, not an artificially widened one.

Why Doing Gonioscopy in the Dark Matters

This is one of the most under-discussed variables in glaucoma diagnosis.

When light hits the eye, the pupil constricts. A smaller pupil pulls the peripheral iris away from the trabecular meshwork, which can open up an angle that is, in normal daily conditions, narrow or intermittently closing. If your gonioscopy is done in a bright room, an angle-closure risk can be missed — graded as open when it isn’t reliably open at all.

I do gonioscopy with the room lights dimmed, so the pupil stays closer to its natural size. This is closer to how your eye actually behaves when you walk out of a bright clinic into dim evening light, or sit in a dark cinema. These are the exact conditions in which angle closure is most likely to be triggered. Where indicated, I also use dynamic (indentation) gonioscopy. This involves gently pressing the lens to distinguish a truly closed angle from one that only appears closed (appositional closure). This distinction changes management directly. It decides whether you need a laser iridotomy, monitoring, or nothing at all.

Why Experience in This Specific Test Matters

Gonioscopy is a skill-dependent test — the same eye can be graded differently by two examiners. It takes practiced technique to hold the lens steady, avoid corneal compression that distorts the view, and read subtle angle structures consistently.

Gonioscopy is a routine part of my daily glaucoma practice, not an occasional add-on test. As a fellowship-trained glaucoma and neuro-ophthalmology specialist with over 25 years in the field, and as a research collaborator with Mayo Clinic, Jacksonville, my clinical work is built around glaucoma diagnosis and long-term angle monitoring. This means I perform gonioscopy, not delegate, on nearly every glaucoma or glaucoma-suspect patient I see.

Dr Shibal Bhartiya’s Published Research on Angle Closure

My angle-closure glaucoma work has been published in peer-reviewed journals and is indexed on PubMed, including:

You can view these and my other publications on PubMed and Google Scholar.

Frequently Asked Questions

Is gonioscopy painful?

No. Numbing drops remove the pain. You may feel mild pressure. Gonioscopy is very safe, and the lens touches the eye only briefly.

How long does gonioscopy take?

The test takes about five minutes. The full visit, with explanation, takes 20 to 30 minutes.

Will I need gonioscopy more than once?

Yes. Angles change with age, lens growth and after laser. I repeat the test when your glaucoma or narrow angle needs monitoring.

Does room lighting really change my result?

Yes. Bright light can make a narrow angle look falsely open. I do gonioscopy in a dimmed room for this reason. The bright light constricts the pupil and can pull the iris away from the drainage angle, making a narrow angle look artificially open.

Is gonioscopy available in Gurgaon?

Yes. I perform it routinely in Gurgaon, as part of every comprehensive glaucoma evaluation. I specifically do it in a dark room, and do the dynamic indentation where indicated.

What is dynamic (indentation) gonioscopy, and do I need it?

It’s a technique where gentle pressure is applied through the lens to see whether a closed-looking angle is truly closed or only appositionally closed. It’s used selectively, when the initial view suggests possible closure. This is because it changes whether you need a laser iridotomy or just monitoring.

How is this different from gonioscopy done elsewhere?

The test itself is standardised, but technique varies. Room lighting, indentation technique, and examiner experience all affect the reading. These are the specific variables I control for in every gonioscopy I perform.

How long will my vision stay blurry after a gonioscopy, and can I drive myself home?

The mild blurring and smudging you experience usually clear completely within 15 to 20 minutes. This temporary blurriness is not caused by long-acting dilation drops, but simply by the viscous lubricating gel placed on the diagnostic lens to protect your cornea during the examination. Once the gel washes away with natural blinking, your baseline vision returns to normal, and you can comfortably drive yourself home.

Can a gonioscopy test actually prevent an acute glaucoma attack?

Yes, indirectly—it is often the single test that saves a patient from a sudden, sight-threatening emergency. Acute angle-closure glaucoma happens when the eye’s drainage path suddenly blocks, triggering a rapid, agonizing spike in intraocular pressure. Gonioscopy is the only clinical examination that lets a specialist see an anatomically narrow or occludable angle long before symptoms appear. Detecting this early allows your doctor to perform a quick, preventive laser peripheral iridotomy (LPI) to keep the fluid pathway open permanently.

Book a Gonioscopy or Glaucoma Evaluation in Gurgaon

If you have a shallow anterior chamber, a family history of angle closure, or have simply never had your drainage angle formally assessed. A gonioscopy — done correctly — is a five-minute test that can prevent an acute angle-closure attack.

If you have been diagnosed with glaucoma, but have never had a gonioscopy, Request a Glaucoma Second Opinion.

Book an Appointment At my clinic in Gurgaon→

📍 Gurgaon 📞 +91 88826 38735 | 🌐 Contact Us | Second Opinion Form for teleconsults

Please also read about Comprehensive Eye Exam.

This article is part of the Glaucoma Diagnosis Hub. You may also want to read Eye Pressure Measurement, Why Do I Need a Visual Field Test? Understanding Your OCT Report in Glaucoma, Visual Field and OCT: Structure & Function Correlation, Gonioscopy, Glaucoma Progression: What It Means and How to Slow It, Do I Really Need All These Tests and Get a Glaucoma Second Opinion in Gurgaon

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.

Dr Bhartiya has published peer-reviewed research on glaucoma management, examining how treatment decisions should balance medical evidence, patient preferences, and long-term vision outcomes. She is also a committed patient advocate and mainstream medical columnist, translating complex ophthalmic evidence into actionable public health insights across leading national platforms including NDTV and OnlyMyHealth

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). Her 200+ publications, including 90+ PubMed-indexed publications and 28 edited textbooks span glaucoma biology, surgical outcomes, health equity, and emerging diagnostics.

1670+ Five Star Patient Reviews Google Business Profile

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

Read her research on PubMed | Google Scholar | ResearchGate | ORCID | Github | Wikidata

📋Upload your reports for a structured review.| 🌐 Contact Us| 📞 +91 88826 38735

⭐ Helped by this article? Leave a Google review — it helps other patients find reliable eye care.

Last Reviewed: October 2026

Could My Migraines Be Angle Closure Glaucoma?

Angle closure glaucoma can cause severe headache, nausea, and halos around lights, so it can look like migraine. A gonioscopy exam checks your drainage angle, and a laser iridotomy can treat narrow angles when needed.

She came for a routine eye check. She was in her late forties or early fifties. She had no eye complaints. She wanted to know whether her glasses needed a small change.

During the examination, I noticed that the front chamber of her eyes was shallow. I explained that I needed to look at her drainage angles with a gonioscopy. I asked if she had headaches or saw coloured haloes around light bulbs.

She began to talk. For seven to eight years, she had lived with migraines. She had tried treatment after treatment and seen specialist after specialist. The headaches kept coming.

I placed a gonioscope on each eye. It is a contact lens with a mirror that shows the drainage angle directly. Both angles were narrow. In roughly a quadrant of each eye, parts of the angle had already stuck shut. Her eye pressure measured 22 to 24 mmHg. [ADD: one sentence on optic nerve and visual field status.]

We treated [both eyes] with a laser peripheral iridotomy in the clinic. That was ten years ago. She tells me she has had no migraine attacks since. She still gets an occasional headache.

Years of treatment had focused on her head. Her drainage angles had not been examined until that day.

Patient details have been changed to protect privacy.

Her case teaches a careful lesson. Most migraines have nothing to do with the eyes. But narrow angles can cause attacks that look like migraine, and a headache workup does not check for them. If years of treatment have not worked, your tiredness is real. Below, I explain how angle closure mimics migraine, how to tell the clues apart, which migraine medicines can trigger it, and when an eye examination is urgent.

How Angle Closure Glaucoma Mimics Migraine

Angle closure glaucoma can look like migraine because the symptoms overlap. The drainage angle is the gap where fluid leaves the eye. In angle closure, this gap narrows or blocks, and eye pressure rises. In intermittent angle closure, the angle blocks for a while and then reopens. The pressure falls, and the attack passes.

During an attack, a patient may have severe throbbing headache, nausea, vomiting, eye redness, and an ache around the eye. In some people, the headache is the only symptom. Haloes appear because the cornea swells when pressure rises. Attacks often start in dim light or in the evening, when the pupil widens. The International Headache Society lists angle closure as a cause of secondary headache. [CITE 1]

Between attacks, narrow angles cause no symptoms. The eye can look normal and see well. Only an examination with gonioscopy can find them. A full attack, called acute angle closure, is an emergency.

Doctors grade angle closure in three steps. Narrow angles alone are called primary angle closure suspect. Narrow angles with adhesions or raised pressure are primary angle closure. Add optic nerve damage, and it becomes primary angle closure glaucoma. Her eyes had adhesions and raised pressure, so she had primary angle closure.

How to Tell Migraine From Angle Closure

SymptomWhat It SuggestsWhat To Do
Headache with haloes around lights, seen with eyes openCorneal swelling from raised pressureAsk an eye doctor for gonioscopy and a pressure check within the week
Zigzag or shimmering lights that stay when you close your eyesMigraine aura, which comes from the brainTell your neurologist. Ask for an eye check if eye pain also occurs
Headache with red eye and ache around the socketPossible raised eye pressureGo to an eye emergency the same day if the pain is severe
Attacks start in dim light or in the eveningA widened pupil may narrow the angleAsk your eye doctor about narrow angles and gonioscopy
Blurred vision that clears after the headacheTemporary corneal swellingBook an eye exam this week. Go the same day if vision does not clear
Migraine treatment is failing and your angles were never checkedNarrow angles are one possible missed causeAsk a glaucoma specialist for gonioscopy
New eye pain or blur after starting topiramateDrug-induced angle closure is possibleSeek same-day emergency eye care and tell your prescribing doctor

Why is Angle Closure Missed

A headache workup does not include gonioscopy. It is a specialist test. Neurologists and physicians do not carry gonioscopes. That is a gap in the system, not a failing of those doctors.

The symptoms fit migraine, so the label sticks. Both can start suddenly, and both can bring nausea.

Some patients mention haloes. Not every doctor follows up with an eye examination.

Narrow angles are silent between attacks. Good vision and a quiet eye give false reassurance. Routine eye checks, including many glasses checks, do not always include gonioscopy.

Migraine Medicines and Angle Closure

Some medicines can trigger angle closure in vulnerable eyes. Topiramate, sometimes used to prevent migraine, can cause sudden angle closure, often in both eyes. Drops that widen the pupil can also set off an attack in narrow angles. Tell your doctor if anyone has told you your angles are narrow. Do not stop a prescribed medicine on your own.

What Laser Peripheral Iridotomy Does and Does Not Do

A laser peripheral iridotomy (LPI) makes a tiny opening in the iris. Fluid can then pass through it. This relieves the blockage that narrows the angle. We do it in the clinic, and it usually takes under ten minutes. There is no incision and no general anaesthesia.

LPI treats the angle. It does not treat migraine itself. Her attacks stopped after LPI. That is one patient’s experience, not proof that LPI treats migraine.

LPI lowers the risk of angle closure in narrow-angle eyes. A large randomised trial in China showed this. Some eyes still need drops or surgery, especially when adhesions or optic nerve damage are present. Common effects are brief blur, glare, and a short pressure rise. Some patients notice a thin arc of light.

When To See an Eye Specialist for Headaches

See a Doctor Urgently

  • Sudden eye pain with redness and blurred vision
  • Severe headache with nausea, vomiting, and haloes around lights
  • New eye pain or blur after starting topiramate
  • A sudden “worst ever” headache, weakness, trouble speaking, or confusion. Go to an emergency room. This may not be an eye problem.

See a Glaucoma Specialist

  • Recurring headaches have not responded to treatment, and your angles were never examined
  • Your headaches come with haloes or eye ache
  • You have a family history of angle closure
  • You are significantly long-sighted

Frequently Asked Questions

Can angle closure glaucoma cause headaches that feel like migraine?

Yes, in some people. Intermittent angle closure can cause throbbing headache, nausea, vomiting, eye redness, and haloes around lights. These overlap with migraine, so the cause can be missed for years. A gonioscopy exam checks the drainage angle. Most migraines are not caused by the eye, but your doctor can rule this out.

What is a laser peripheral iridotomy, and is it a major procedure?

It is a minor laser procedure done in the clinic, usually in under ten minutes. The laser makes a tiny opening in the iris so fluid can flow freely. There is no incision, no hospital stay, and no general anaesthesia. Most patients resume normal activity the same day. Some notice brief blur or glare afterwards.

Can a laser iridotomy cure my migraines?

Not in general. Laser iridotomy treats narrow angles, not migraine itself. If narrow angles were triggering your headaches, the laser may reduce them. One patient of mine had no migraine attacks for ten years afterwards. That is one patient, so your result may differ.

Who should have their drainage angles checked?

Ask for gonioscopy if you have a family history of angle closure or are significantly long-sighted (hypermetropic). Risk is also higher in people over 40, in women, and in people of East or South Asian descent. Ask too if you have recurring headaches with haloes or eye ache that treatment has not helped. Narrow angles cause no symptoms between attacks, so a normal-looking eye does not rule them out.

Book a Consultation

Book if migraines or headaches with haloes or eye ache have not responded to treatment and your drainage angles have never been checked. Book too if you have a family history of angle closure or are significantly long-sighted.

At my clinic in Gurgaon, I will check your eye pressure and examine your drainage angles with gonioscopy. I will explain whether you have narrow angles and whether laser treatment makes sense. Gonioscopy needs an in-person visit. If you live elsewhere, I can review your reports first and work with your local eye doctor.

Book an Appointment:

📍 Gurgaon 📞 +91 88826 38735 | 🌐 Contact Us | Second Opinion Form for teleconsults

Further Reading

This page is a part of the Glaucoma Hub. you may want to read about Glaucoma Progression, , and Risk Stratification in Glaucoma. Other articles of interest could be Advanced Glaucoma Care in Gurgaon, What Good Glaucoma Care Actually Optimises For, What Happens If Glaucoma Is Left Untreated?, More Glaucoma Eye Drops is Not Better Glaucoma Care, 5 Mistakes Patients Make in Glaucoma Care and Do You Really Need Treatment for Glaucoma?

This page is part of the Neuro-Ophthalmology hub. Read about our full approach to neurological vision conditions. Some vision problems are not eye problems. They are brain problems, nerve problems, or vascular problems, that show up in the eye first. Also read about optic nerve disease, AION and NAION, raised intracranial pressure, Vision not clear but tests normal, double vision, and conditions where no diagnosis has yet been reached. Please also read neuro-ophthalmology second opinion, and guidelines for neuro-ophthalmology consults.

You may want to watch this podcast I did several years ago, for Health Talks.

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.

Dr Bhartiya has published peer-reviewed research onglaucoma management, examining how treatment decisions should balance medical evidence, patient preferences, and long-term vision outcomes. She is also a committed patient advocate and mainstream medical columnist, translating complex ophthalmic evidence into actionable public health insights across leading national platforms including NDTV and OnlyMyHealth

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.

1670+ Five Star Patient Reviews Google Business Profile

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

Read her research on PubMed | Google Scholar | ResearchGate | ORCID | Github | Wikidata

📋Upload your reports for a structured review.| 🌐 Contact Us| 📞 +91 88826 38735

⭐ Helped by this article? Leave a Google review — it helps other patients find reliable eye care.

Last Reviewed: 10 October 2026

Laser Peripheral Iridotomy

Posted on by Shibal Bhartiya

Laser peripheral iridotomy is the treatment for angle-closure disease. During the procedure, your eye doctor will use a laser to create a tiny hole in the coloured part of your eye, the iris. This little hole provides an alternate drainage pathway for the fluid inside the eye. Remember, this impaired fluid drainage can lead to an increase in eye pressure, leading to glaucoma.