Difficulty seeing at night, even with “normal” tests, can be an early, often missed signal of underlying eye disease. Clear vision isn’t always safe vision; subtle changes in low light deserve a closer, expert look, explains Dr Shibal Bhartiya.
Difficulty seeing at night is not just an inconvenience. It is often the first sign that something is wrong inside your eye. If you strain to read road signs after dark, feel blinded by oncoming headlights, or need more time to adjust when you walk into a dimly lit room, your eyes are asking you to pay attention.
Many people live with night vision problems for years before seeking help. By the time they do, a treatable condition has sometimes become harder to manage. The right time to see a doctor is now, before your symptoms get worse.
Many patients who come to Dr Bhartiya with night vision complaints have never been told that difficulty adjusting to low light is one of the earliest detectable signs of glaucoma, a condition that has no pain, no redness, and no warning until vision is already lost.
An uncorrected or wrongly corrected spectacle power is one of the most common reasons for poor night vision. Myopia (short-sightedness) makes distant objects blur in all lighting conditions, but the effect is far more noticeable at night. An updated prescription often resolves this quickly.
A cataract clouds the natural lens inside your eye. As it thickens, light scatters before it reaches the retina. This causes glare, halos around lights, and reduced contrast — all of which become more pronounced after dark. Cataracts are treatable with surgery, but early detection gives you more options and better outcomes.
Glaucoma damages the optic nerve gradually and silently. One of its earliest and most overlooked signs is difficulty adapting to low light and a narrowing of your side vision. Most people with glaucoma notice nothing unusual until the damage is advanced. Night driving difficulty, bumping into objects in dim light, or needing extra time to adjust when entering a dark room can all be early warnings. Glaucoma cannot be reversed, but it can be stopped — if it is caught in time.
Uncontrolled diabetes damages the small blood vessels in the retina. This affects how the retina processes light, making night vision one of the first things to suffer. If you have diabetes and notice worsening night vision, do not wait.
Vitamin A is essential for producing rhodopsin, the pigment your retina uses to see in dim light. A deficiency, more common in children but possible in adults with certain diets or gut conditions, directly impairs night vision. This is one of the few causes that is fully reversible with the right nutrition.
Retinitis Pigmentosa
This inherited condition progressively destroys the light-sensitive cells in the retina. Night blindness is usually the first symptom, followed slowly by tunnel vision. Early diagnosis allows for monitoring, genetic counselling, and planning.
When Is Difficulty Seeing at Night Serious?
See a doctor promptly if you notice any of the following:
Glaucoma is called the silent thief of sight for a reason. It takes peripheral vision first, the vision you use to see around you, navigate in dim light, and detect movement. By the time central vision is affected, the damage is already severe.
Night difficulty is one of the earliest functional signs of peripheral vision loss. People often blame tiredness, screen exposure, or ageing, and miss what is actually happening to their optic nerve.
OCT scan— provides a detailed cross-section of the optic nerve and retina, detecting changes years before standard tests
This examination takes about 30 to 45 minutes. It is painless. And it could catch a condition that has no symptoms yet.
Frequently Asked Questions
Is difficulty seeing at night always a sign of a serious eye condition?
Not always. A mild refractive error or vitamin deficiency can cause night vision problems that are fully correctable. However, it can also be an early sign of glaucoma, cataracts, or retinal disease — which are serious. The only way to know is a proper eye examination. Do not self-diagnose.
Can difficulty seeing at night be treated?
Yes, in most cases. Treatment depends on the cause. Refractive errors are corrected with updated spectacles or contact lenses. Cataracts are managed with surgery. Glaucoma is treated with eye drops, laser, or surgery to stop progression. The earlier you seek care, the more treatment options are available.
I am 38 and healthy. Do I really need to worry about night vision changes?
Yes. Glaucoma can begin in your 30s, and Indians are at higher risk than many other populations. If your night vision has changed — even slightly — it is worth ruling out the serious causes. An OCT scan and visual field test take less than an hour and can give you complete clarity.
Does using screens at night cause permanent night vision problems?
Screen use causes temporary eye strain and can make it harder to adjust to darkness in the short term. It does not cause permanent night vision damage. However, if you use this explanation to dismiss persistent night vision symptoms, you may delay the diagnosis of something that does need treatment.
How is a glaucoma-related night vision problem different from normal ageing?
Some loss of contrast sensitivity is normal with age. But a progressive change in how quickly your eyes adjust to darkness, or difficulty on the side of your vision in low light, is not simply ageing — it needs investigation. The key question is whether your night vision has changed. If it has, see a specialist.
Book a Consultation
Night vision problems are worth taking seriously. A 45-minute appointment could detect a condition that has no other symptoms — and protect your vision before damage becomes permanent.
Book an appointment with Dr Shibal Bhartiya — Glaucoma Specialist, Gurgaon
She has published peer-reviewed research on glaucoma management, examining how treatment decisions should balance medical evidence, patient preferences, and long-term vision outcomes.
Family History & Glaucoma Screening– My Parent or Sibling Has Glaucoma. Do I Need to Get Tested Too? Short answer, YES. Having a first degree relative with glaucoma: a parent, sibling, or child, raises your lifetime risk of developing the disease by four to nine times compared to someone with no family history, says Dr Shibal Bhartiya.
Your parent or sibling has just been diagnosed with glaucoma. Or perhaps they have had it for years and you are only now realising what that means for you.
You are asking the right question. Most people do not ask it until it is too late. Dr Shibal Bhartiya explains more.
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 Family History Changes Everything in Glaucoma
Glaucoma is not random. It runs in families. Having a first degree relative with glaucoma: a parent, sibling, or child, raises your lifetime risk of developing the disease by four to nine times compared to someone with no family history.
That is not a small increase. That is a fundamental shift in your risk category.
And yet most first degree relatives of glaucoma patients never get tested. They wait for symptoms. Glaucoma does not produce symptoms until significant, often irreversible damage has already occurred. By the time your vision changes, the window for early intervention has often narrowed considerably.
A first degree relative is a parent, sibling, or child: someone who shares approximately 50 percent of your genetic material.
The first degree relative glaucoma risk is well established in research. Studies consistently show that having one affected first degree relative raises your risk of developing primary open angle glaucoma to approximately 1 in 5. Having two affected first degree relatives raises it further.
The risk is highest when the affected relative developed glaucoma before the age of 60, when the disease was severe at diagnosis, or when the relative required surgery rather than drops alone.
First degree relative glaucoma risk is also higher in specific ethnic groups. People of African descent carry a higher baseline risk. In India, primary angle closure glaucoma has a higher prevalence than in Western populations, and this pattern also clusters in families.
Knowing your family history is not just useful. In glaucoma, it is clinically essential.
Does Having a Family History Mean You Will Definitely Get Glaucoma?
No. A family history raises your risk. It does not guarantee disease.
Many people with a strong family history never develop glaucoma. Many develop it only in their seventies or eighties, when treatment is straightforward and vision loss is entirely preventable with monitoring.
What family history means clinically is this: you belong in a higher-risk group that benefits from earlier, more frequent screening for glaucoma. That is all. It is not a sentence. It is a schedule.
Glaucoma Risk Factors Beyond Family History
Family history is the single strongest glaucoma risk factor after age. But it does not act alone. Several other glaucoma risk factors combine with family history to raise your personal risk further.
Age is the most consistent glaucoma risk factor across all populations. Risk rises steeply after 40 and continues to increase with each decade.
Raised eye pressure, also called ocular hypertension, is a major modifiable glaucoma risk factor. Not everyone with high eye pressure develops glaucoma, but the risk is substantially elevated, particularly when combined with family history.
Myopia (near-sightedness) increases glaucoma risk, particularly for primary open angle glaucoma. Moderate to high myopia is an independent glaucoma risk factor.
Thin corneas reduce the accuracy of eye pressure measurements and are independently associated with glaucoma progression risk.
Systemic conditions including diabetes, hypertension, and migraine are associated with higher glaucoma risk in some studies, particularly for normal tension glaucoma.
Previous eye injury or steroid use — whether eye drops, inhalers, skin creams, or oral steroids — can raise eye pressure and trigger steroid-induced glaucoma, particularly in genetically susceptible individuals.
When you combine a family history of glaucoma with one or more of these additional glaucoma risk factors, the case for early screening becomes compelling.
What Does Screening for Glaucoma in Adults Actually Involve?
Screening for glaucoma in adults is not a single test. It is a short, structured examination that covers the four main parameters of glaucoma assessment.
Eye pressure measurement — intraocular pressure is measured using a non-contact tonometer or applanation tonometry. This takes less than a minute. It is painless.
Optic nerve assessment— the ophthalmologist examines the optic disc through a dilated pupil or with specialist lenses. The size, shape, and symmetry of the optic nerve head are evaluated. This is the most important part of any glaucoma screening examination.
Corneal thickness measurement — pachymetry measures corneal thickness, which affects the interpretation of eye pressure readings.
OCT imaging — optical coherence tomography of the RNFL and optic nerve head provides structural data that can detect early glaucoma damage before any symptoms or visual field changes occur. You can read more about what an OCT scan shows and how to interpret your report.
Visual field testing — in higher-risk individuals, a visual field test maps peripheral and central vision to detect any functional loss.
Gonioscopy — in patients where angle closure is suspected, gonioscopy examines the drainage angle of the eye. This is particularly relevant in Indians, where angle closure glaucoma is more prevalent.
A complete screening for glaucoma in adults takes approximately 45 to 60 minutes at a specialist glaucoma clinic, including dilation time.
For most adults with a first degree relative with glaucoma and no other risk factors, screening should begin at 40. Some guidelines recommend starting at 35 in high-risk ethnic groups or when the affected relative had early-onset disease.
For adults with a family history plus additional glaucoma risk factors: high myopia, raised eye pressure found incidentally, or very thin corneas, earlier screening is warranted. In these cases, a baseline examination in the mid-thirties is reasonable.
For adults with no family history and no other risk factors, screening for glaucoma in adults is generally recommended from the age of 40 as part of a routine comprehensive eye examination.
The question is not whether to screen. The question is when to start and how often to repeat.
How Often Should You Be Screened?
Frequency depends on what the first examination shows.
If the first screening is entirely normal: normal eye pressure, healthy optic nerve, normal OCT, annual or biennial review is appropriate for most people in the family history risk group.
If the first screening shows borderline findings: slightly elevated pressure, a suspicious optic disc, or mildly thin RNFL on OCT, more frequent monitoring is needed. Your glaucoma specialist will advise a specific schedule based on your individual findings.
If the first screening confirms early glaucoma, you move from a screening pathway to a treatment and monitoring pathway. Early glaucoma detected through family history glaucoma screening is almost always manageable, and vision loss is highly preventable with timely intervention.
Detecting Glaucoma Early: Why It Matters So Much
Glaucoma destroys retinal nerve fibres. Once those fibres are gone, they do not regenerate. The vision lost to glaucoma does not return.
Detecting glaucoma early changes the entire trajectory of the disease. A patient diagnosed at the very beginning of structural damage, before any visual field loss, has an excellent long-term prognosis with appropriate treatment. A patient diagnosed after significant optic nerve damage faces a harder, narrower path.
The difference between these two patients is often not biology. It is timing. It is whether someone in the family said: you should get checked, and whether the person listened.
Detecting glaucoma early through structured family history screening is one of the highest-value interventions in all of preventive ophthalmology. It costs very little. It changes lives.
What Happens If Glaucoma Is Found?
Finding glaucoma early through family history glaucoma screening is not bad news. It is good news delivered at the right time.
Early glaucoma in a screened patient is almost always managed with eye drops alone. Treatment is started, eye pressure is brought to a safe target, and the optic nerve is monitored regularly. Most patients with early glaucoma, managed well and consistently, never develop significant visual impairment.
The goal of glaucoma treatment is not to cure the disease. It is to slow it so completely that it never affects your quality of life. That goal is realistic. It is achieved every day for patients who are found early.
What changes if glaucoma is found is not your life. It is your schedule, a few extra clinic visits and a bottle of eye drops. That is the trade. For preserved vision over decades, it is a very good trade.
What If the Screening Is Normal?
A normal screening result is genuinely reassuring, but it is not a permanent all-clear.
Glaucoma can develop or progress at any age. A normal result at 40 means you do not have glaucoma now. It does not mean you will never develop it. This is why regular, repeated family history glaucoma screening matters more than a single normal result.
Think of it the way you think of blood pressure checks or dental appointments. A normal result today schedules your next check. It does not cancel all future checks.
A specialist assessment goes beyond a basic eye pressure check. It includes optic nerve imaging, corneal thickness measurement, OCT analysis, and visual field testing, and if indicated, gonioscopy. This gives you a complete, documented baseline against which future examinations can be compared.
Dr Shibal Bhartiya is a fellowship-trained glaucoma specialist and Mayo Clinic Research Collaborator, Clinical Director at Marengo Asia Hospitals, Gurugram. She offers structured glaucoma risk assessments for patients with a family history of glaucoma, including those seeking a second opinion on existing results or diagnoses.
Your parent’s diagnosis is information. It is not fate.
The single most useful thing you can do with that information is act on it early, before symptoms, before damage, before the window narrows.
Glaucoma caught early is a very manageable disease. Glaucoma caught late is a much harder conversation. The difference is often a single timely appointment.
Book one.
Family History as a Glaucoma Risk Trigger, Not a Footnote
A positive family history remains one of the most clinically actionable risk signals in glaucoma, yet also one of the most under-leveraged.
First-degree relatives of patients with glaucoma have a substantially higher lifetime risk (often 3–4× or more), and importantly, may develop disease earlier and with more aggressive trajectories.
Dr Bhartiya’s editorial along with geneticists from AIIMS, New Delhi and Marengo Asia, emphasises on integrating genomics into practice (PMID: 41523176), reinforcing that family history is not merely a background detail but a proxy for inherited susceptibility that should actively trigger structured screening pathways.
In practical terms, this shifts glaucoma care from opportunistic detection to targeted risk-based screening, where identifying and counselling family members becomes a core extension of clinical responsibility, not an optional add-on.
Clinical Reality (Family History & Glaucoma Screening in India)
Family history is one of the strongest risk factors — but often ignored Many patients only realise its importance after damage has already occurred.
Screening is not routine for relatives Unlike diabetes or hypertension, glaucoma screening is rarely proactively advised to family members.
“No symptoms” delays first check High-risk individuals often wait for visual complaints, by which time disease may already be advanced.
Normal eye check-ups may miss early glaucoma Routine vision tests without optic nerve evaluation or fields can miss disease.
Younger family members are often overlooked Screening is delayed until later decades, despite risk beginning earlier.
One normal test gives false reassurance A single normal OCT or pressure reading does not rule out future risk.
What Good Screening Looks Like (If You Have a Family History of Glaucoma)
Early baseline screening — before symptoms Ideally by age 30–40, or earlier if multiple affected relatives.
Comprehensive evaluation, not just vision or pressure Includes optic nerve assessment, OCT, visual fields, corneal thickness.
Risk-stratified follow-up Frequency depends on baseline findings — not “come if needed.”
Risk can begin earlier in those with family history
Screening from 30–40 years or earlier if high risk
Single normal report
“Everything was normal last time”
One test cannot rule out future progression
Periodic follow-up based on risk profile
Family awareness
“No one told my family to get tested”
Screening advice is often not extended to relatives
Proactive, family-based screening approach
Follow-up
“I’ll come back if needed”
Irregular follow-up delays detection of early changes
Structured, risk-based follow-up intervals
Understanding risk
“It’s just genetic, nothing to do now”
Early detection can prevent vision loss
Education + long-term monitoring strategy
Disease perception
“Glaucoma means high pressure only”
Many patients develop glaucoma at normal pressures
Broader risk assessment beyond IOP
Goal of screening
“Just to rule it out”
Screening is about early detection and tracking change
Long-term risk management, not one-time clearance
Frequently Asked Questions: Family History and Glaucoma Screening
Does glaucoma run in families?
Yes. Having a first degree relative: a parent, sibling, or child with glaucoma raises your lifetime risk of developing the disease by four to nine times. Family history is the single strongest glaucoma risk factor after age. Structured family history glaucoma screening is recommended for all first degree relatives of glaucoma patients.
What is the risk of glaucoma if a parent has it?
The first degree relative glaucoma risk is approximately 1 in 5 for primary open angle glaucoma, significantly higher than the general population risk of around 1 in 50. The risk is higher when the affected parent developed glaucoma early, had severe disease, or required surgery.
At what age should I get screened for glaucoma if a parent has it?
Screening for glaucoma early should begin at 40 for most adults with a first degree relative with glaucoma. Those with additional glaucoma risk factors, high myopia, raised eye pressure, or thin corneas, should consider a baseline examination from the mid-thirties.
What does glaucoma screening involve?
Screening for glaucoma in adults includes eye pressure measurement, optic nerve assessment through a dilated pupil, corneal thickness measurement, OCT imaging of the nerve fibre layer, and visual field testing in higher-risk individuals. A complete specialist assessment takes approximately 45 to 60 minutes.
Can glaucoma skip a generation?
Yes. The genetic inheritance pattern of glaucoma is complex and not fully understood. Glaucoma can skip generations or manifest differently across family members. A negative family history in your parents does not fully exclude risk if grandparents or siblings are affected.
What glaucoma risk factors increase my risk beyond family history?
Key glaucoma risk factors that combine with family history include age over 40, raised eye pressure, moderate to high myopia, thin corneas, diabetes, and previous steroid use. The more risk factors present alongside family history, the stronger the case for early and frequent screening.
If my glaucoma screening is normal, do I still need follow-up?
Yes. A normal result at first screening does not mean permanent all-clear. Glaucoma can develop at any point. Annual or biennial review is recommended for adults with a family history of glaucoma, even when the initial assessment is entirely normal.
She has published peer-reviewed research on glaucoma management, examining how treatment decisions should balance medical evidence, patient preferences, and long-term vision outcomes.
