By Indumati Netralaya Medical Team · NABH Certified Eye Hospital, Prayagraj · Updated March 27, 2026

Diabetic Eye Screening: Why Every Diabetic Needs an Annual Eye Exam

People with diabetes should get a dilated eye exam every year, even without symptoms. Diabetic retinopathy causes no pain or vision loss in early stages — by the time symptoms appear, permanent damage may have already occurred. Early screening saves sight.

India has over 100 million people living with diabetes — the highest number of any country in the world. Of these, a significant proportion will develop diabetic retinopathy, a condition that damages the blood vessels of the retina and can lead to permanent vision loss. The frightening truth is that diabetic retinopathy often causes no symptoms until it has already caused serious damage. An annual eye examination is the only reliable way to catch it early, when treatment is most effective.

What Is Diabetic Retinopathy?

The retina is the light-sensitive layer at the back of the eye that converts what you see into signals sent to the brain. It is nourished by a network of tiny blood vessels. Persistently high blood sugar levels damage these blood vessels over time, causing them to leak fluid, swell, and eventually grow new abnormal vessels that bleed into the eye. This process is called diabetic retinopathy.

Diabetic retinopathy is the leading cause of new blindness in working-age adults in India. Yet it is almost entirely preventable with good blood sugar control and detectable with a simple annual eye examination before symptoms appear.

The Four Stages of Diabetic Retinopathy

NPDR stands for Non-Proliferative Diabetic Retinopathy. In the early stages, the damage is within the retina itself and has not yet triggered new blood vessel growth. Once it progresses to Proliferative DR, the risk of serious vision loss rises sharply and treatment becomes more urgent and more complex.

Diabetic Macular Oedema: The Other Threat

Alongside retinopathy, diabetic patients face another condition: diabetic macular oedema (DMO). The macula is the central part of the retina responsible for sharp, detailed vision — used for reading, recognising faces, and seeing fine details. When blood vessels leak fluid into the macula, it swells and vision becomes blurred or distorted. DMO can occur at any stage of retinopathy, including mild NPDR, and is currently the most common cause of vision impairment in diabetic patients.

DMO is treated with anti-VEGF injections into the eye, which reduce the leakage and swelling. Treatment is highly effective when started early, and many patients recover significant vision. Delay in treatment allows permanent scarring of the macula that cannot be reversed.

Diabetic retinopathy and macular oedema cause no pain and often no noticeable symptoms until the damage is already severe. By the time a diabetic patient notices their vision has changed, significant and potentially irreversible damage may have already occurred. Annual screening is not optional — it is essential.

Who Needs Diabetic Eye Screening and How Often?

All people with diabetes — both Type 1 and Type 2 — need regular eye examinations. The recommended frequency depends on the duration of diabetes and existing retinopathy findings:

• Newly diagnosed Type 2 diabetes: Eye examination at the time of diagnosis, then annually if no retinopathy is found.
• Type 1 diabetes: Eye examination within 5 years of diagnosis (or at puberty, whichever comes first), then annually.
• Existing mild or moderate NPDR: Every 6 months.
• Existing severe NPDR or active PDR: Every 3 months or as directed by the treating ophthalmologist.
• Pregnancy with pre-existing diabetes: Before conception and each trimester, as pregnancy can accelerate retinopathy progression.

Poor blood sugar control (high HbA1c), longstanding diabetes, high blood pressure, and kidney disease all increase the risk and rate of progression. Patients with these risk factors may need more frequent monitoring than the standard annual schedule.

What to Expect During a Diabetic Eye Screening

A comprehensive diabetic eye examination at Indumati Netralaya includes the following steps:

1. Visual acuity test: Measures how clearly you can see with each eye. A drop in acuity from a previous visit may indicate macular involvement.
2. Pupil dilation: Eye drops are instilled to widen the pupil. This takes about 20–30 minutes to work and causes temporary blurring of near vision and light sensitivity for a few hours afterwards. Plan not to drive yourself home.
3. Slit lamp examination: The front of the eye, lens, and anterior vitreous are examined for diabetes-related changes including early cataracts, which are more common in diabetic patients.
4. Dilated fundus examination: The ophthalmologist examines the retina, macula, and optic nerve through the dilated pupil using a specialised lens. This is where retinopathy changes are identified.
5. Fundus photography: Digital photographs of the retina are taken to document findings. These photographs allow precise comparison at each annual visit to track whether retinopathy is stable or progressing.
6. OCT scan (when indicated): Optical Coherence Tomography is a non-invasive scan that produces a cross-sectional image of the macula, allowing measurement of retinal thickness and detection of fluid beneath the retinal layers. It is the gold standard for diagnosing and monitoring diabetic macular oedema.

Treatment Options for Diabetic Retinopathy

Laser Photocoagulation

Laser treatment uses a focused beam of light to seal leaking blood vessels and destroy areas of the peripheral retina that are triggering abnormal new vessel growth. Pan-retinal photocoagulation (PRP) is performed over one or two sessions for severe NPDR and PDR. It does not restore lost vision but prevents further deterioration. The procedure is done as an outpatient under topical anaesthetic drops and takes about 20–30 minutes per session.

Anti-VEGF Injections

Anti-VEGF (vascular endothelial growth factor) drugs are injected into the vitreous cavity of the eye to reduce the growth of new abnormal blood vessels and to treat macular oedema. Commonly used agents include ranibizumab and bevacizumab. Multiple injections are typically required over months to years. These injections are the current first-line treatment for diabetic macular oedema and vision-threatening PDR. They are performed as outpatient procedures under strict sterile conditions and take about 10 minutes per session.

Vitreoretinal Surgery

When retinopathy has advanced to the point where there is bleeding into the vitreous (vitreous haemorrhage) or the retina has detached due to fibrous tissue pulling on it, surgery becomes necessary. Vitrectomy — removal of the vitreous gel and repair of the retina — can restore useful vision in many cases but is complex surgery with a longer recovery period.

Prevention: The Most Effective Strategy

No treatment can fully restore vision lost to advanced diabetic retinopathy. Prevention and early detection are far more effective than any intervention. The steps that reduce the risk of developing or progressing retinopathy are:

• Control your blood sugar: Keeping HbA1c below 7% (or as directed by your physician) is the single most effective measure. Every 1% reduction in HbA1c reduces the risk of microvascular complications including retinopathy by approximately 35%.
• Control your blood pressure: Target below 130/80 mmHg. High blood pressure independently damages retinal vessels and dramatically accelerates retinopathy progression.
• Control your blood lipids: High triglycerides and low HDL increase the risk of hard exudates depositing in the macula, threatening central vision.
• Quit smoking: Smoking worsens diabetic vascular disease throughout the body, including in the eyes.
• Annual eye examination without fail: Even when your vision feels perfect.

Book Your Diabetic Eye Screening at Indumati Netralaya

Indumati Netralaya offers comprehensive diabetic retinopathy screening including fundus examination, digital fundus photography, and OCT scanning where indicated. Our retina specialist has experience managing all stages of diabetic retinopathy and macular disease. We offer free initial screening for diabetic patients and can facilitate subsidised or free treatment for eligible patients through government schemes.

To book your annual diabetic eye examination, call our team or visit our contact page. If you have not had an eye examination since your diabetes diagnosis, please do not delay any further.