How Is a Retina Exam (Dilated Eye Examination) Performed?

A retina exam is a detailed look at the retina — the light-sensitive layer at the back of the eye where vision forms. It's sometimes called a dilated eye examination, since drops are used first to widen the pupil so the retina, optic nerve and blood vessels can be viewed directly. Many retinal diseases — including diabetic retinopathy, age-related macular degeneration (AMD), and retinal tear or detachment — are often first picked up this way. Unlike a routine eye examination, which centres on your glasses prescription and the eye's surface, a retina exam focuses specifically on the back of the eye: the retina and the optic nerve.

Including the time needed for the dilating drops to work, a retina exam usually takes 30-45 minutes in total, though the examination itself takes only a few minutes. There's no cutting or injection involved, so it isn't painful — just a slight pressure when the lens comes close to your eye. People with no symptoms are usually advised to have one once a year; with a risk factor such as diabetes or high myopia, your doctor may suggest checking more often. As the drops keep working for a few hours afterwards, avoid driving yourself home that day.

A retina exam checks the retinal tissue, blood vessels, optic nerve head and macula. Bleeding, fluid build-up, tears, thinning or abnormal vessels can all be picked up, and OCT adds a cross-sectional image of the retinal layers for finer detail.

The exam isn't limited to the centre of the retina — its peripheral areas are checked too, since a retinal tear often starts there. Vessel calibre, colour and course are also assessed; narrowing, blockages or leakage can be an early sign of diabetic retinopathy. The optic nerve head's colour and edge sharpness are noted too, as changes there can point to other conditions.

Some of this is already covered in a routine eye check; a suspected retinal disease calls for a more focused retina exam.

Diabetic patients, people over 40, those with a family history of retinal disease, and people with high myopia are considered higher-risk and worth watching more closely. Anyone noticing eye floaters, sudden vision loss, flashes of light, or a dark patch in their field of vision should also have a retina exam without delay.

Even with no symptoms, regular retina checks are a valuable habit for early detection. How often varies from person to person; the chart below gives an approximate guide by risk group — your doctor confirms the exact frequency at your exam.

Eye floaters and flashes of light are among the most common reasons for a retina exam; in some patients, they warn of a retinal tear. Blurred or wavy vision, bent-looking straight lines, and a marked drop in night vision are further reasons to get checked.

A curtain or shadow over part of your vision needs urgent assessment too, as it can point to a retinal tear or detachment. Sudden vision loss with no pain, a marked rise in flashes, or a sudden increase in floaters all call for a retina exam without delay.

These symptoms can ease off on their own at times, but that doesn't mean the issue has gone — an assessment should still be carried out.

Drops are applied first to dilate the pupil, taking around 20-30 minutes to work; you may notice your near vision blurring while you wait, which is expected. Because of the drops, near vision stays blurred and light-sensitive for a few hours afterwards, so it helps to bring sunglasses. The steps below outline the general flow of a retina exam.

1. 1Pupil Dilation. Drops are applied to dilate the pupil; they take around 20-30 minutes to start working.
2. 2Waiting for the Drops to Work. You wait in the reception area for a short while until the drops take effect.
3. 3Examination with a Biomicroscope or Ophthalmoscope. Using a special lens and light source, the doctor examines the retina, optic nerve and blood vessels inside the eye in detail.
4. 4OCT Imaging, If Needed. If a finding needs a closer look, an OCT scan captures a cross-sectional image of the retinal layers; the scan is quick and doesn't hurt — you simply rest your chin on the device.
5. 5Reviewing the Findings. The examination findings, along with any OCT results, are reviewed together and discussed with you.

The exam may find your retina healthy, or pick up bleeding, fluid build-up, a tear, or vascular changes. On OCT, retinal-layer thickening or thinning shows a condition's stage and its response to treatment.

Results are read alongside your general health and symptoms; one measurement isn't always enough, and follow-up exams may be needed. A healthy result means regular checks continue at your recommended interval.

A finding alone isn't a diagnosis — its type, location and size together show what it points to and what follow-up or treatment it needs. Some findings are simply monitored; others may lead to an intravitreal injection or retinal laser treatment and surgery, depending on your clinical picture.

The conditions most often picked up on a retina exam are diabetic retinopathy, age-related macular degeneration (AMD), and retinal tear or detachment — each with different findings and its own follow-up or treatment approach. Less commonly, the exam can also detect retinal vein occlusion. The order below reflects relative frequency in clinical practice, not a percentage or rate.

When a condition is found, treatment depends on its type. Intravitreal injection is often first choice for diabetic retinopathy and macular degeneration, while a tear or detachment may call for laser or surgery.

An intravitreal injection delivers medication that slows abnormal vessel growth or reduces fluid build-up, usually as a treatment programme at set intervals. For a mechanical problem like a tear or detachment, retinal laser treatment and surgery apply instead — laser seals around the tear to stop it progressing, while advanced cases may need surgery. The right approach depends on the finding and your overall eye health.

If you think you're in a higher-risk group, or notice any of the symptoms above, you can book a retina exam to have your eye health assessed. Bringing your eye health history and any previous results to your appointment with Op. Dr. Anıl Kaya helps the assessment move faster. To book, or ask a question, reach us through the details on our contact page.