Fundoscopy

Fundoscopy is an eye examination that allows a doctor to look directly at the back of your eye — including the retina (the light-sensitive layer that captures images), the optic disc (where the optic nerve enters the eye), and the blood vessels that supply them.

The doctor uses a handheld instrument called an ophthalmoscope, or sometimes a slit-lamp (a microscope with a bright beam of light) with a special lens, to shine a focused beam of light through your pupil. This gives a magnified, detailed view of structures inside the eye that cannot be seen from the outside. The examination itself does not touch the eyeball and produces no radiation.

Fundoscopy is used whenever a doctor needs to assess the health of the back of the eye, either as a routine screen or to investigate a specific symptom. It is one of the few examinations that also lets doctors see the body's blood vessels and nerve tissue directly, so it is sometimes used to monitor systemic (whole-body) diseases as well as eye diseases.

• Diabetic retinopathy — damage to the retinal blood vessels caused by long-term high blood sugar
• Hypertensive retinopathy — changes to retinal vessels caused by persistently high blood pressure
• Glaucoma — a condition where raised pressure inside the eye damages the optic nerve
• Age-related macular degeneration (AMD) — deterioration of the macula (the central part of the retina responsible for sharp, detailed vision)
• Retinal detachment — when the retina peels away from the back of the eye
• Papilloedema — swelling of the optic disc, which can signal raised pressure inside the skull
• Sudden or unexplained loss of vision, blurred vision, or flashes and floaters (spots or shapes drifting across your field of view)
• Routine monitoring during pregnancy or before starting certain medications that can affect the eye
• General eye health screening for people with diabetes, high blood pressure, or a family history of eye disease

There are very few situations where fundoscopy cannot be performed, but it may be limited or postponed in some circumstances.

• Severe corneal (front surface of the eye) cloudiness or scarring that blocks the view through the pupil
• Dense cataract (clouding of the eye's natural lens) that prevents enough light from reaching the back of the eye — in such cases a different imaging technique may be used
• Very young children or patients who are unable to cooperate — a brief general anaesthetic (a sleep medicine) may be needed instead
• Active infection or very painful eye injury — the examination may be deferred until the eye is stable

Fundoscopy is a non-invasive diagnostic examination — nothing enters the eye — so it carries very few risks. Any discomfort is mild and temporary.

• Temporary blurred vision and light sensitivity lasting up to several hours, most commonly caused by dilating (widening) eye drops used to open the pupil — this is expected and not a complication
• Mild stinging or watering of the eyes from the dilating drops, which passes quickly
• Difficulty reading or driving while the pupils remain dilated — patients are usually advised not to drive until dilation wears off
• In very rare cases in people who are already predisposed, dilating drops can trigger acute angle-closure glaucoma (a sudden rise in eye pressure) — your doctor will check whether drops are safe for you beforehand
• Allergic reaction to dilating drops — uncommon and usually minor (redness, itching)

Fundoscopy requires minimal preparation, and in many cases none at all. However, if your doctor plans to dilate your pupils with eye drops, there are a few practical things to arrange beforehand.

Fasting, stopping medications, and avoiding alcohol or smoking are not required for this examination. If you wear contact lenses, you will usually be asked to remove them before the drops are applied and to bring your glasses instead. Because your vision may be blurred for several hours after dilation, it is strongly advisable to arrange for someone else to drive you home.

Your doctor may review your current eye medications or any medications that could affect eye pressure before the appointment. No routine blood tests or imaging are needed specifically for this examination.

The examination itself typically follows these steps:

• You sit in an examination chair in a darkened or dimly lit room.
• If dilation is planned, the nurse or doctor places one or two drops of dilating solution into each eye. You may feel a brief sting.
• You wait for the drops to take effect — usually around 20 to 30 minutes, though your doctor will advise the expected time.
• The doctor dims the room lights further and asks you to look in various directions.
• Using the ophthalmoscope or slit-lamp, the doctor shines a bright but brief beam of light into each eye to examine the retina, optic disc, and blood vessels.
• The doctor may ask you to look directly at the light at certain moments.
• Both eyes are examined in turn. The whole assessment usually takes only a few minutes once dilation is complete.
• The doctor shares findings with you, or arranges a follow-up consultation if further tests are needed.

Because fundoscopy is a non-invasive examination with no incisions or instruments entering the eye, there is no wound care or physical recovery period. The main aftercare consideration is managing the temporary effects of dilating drops, if these were used.

• Expect blurred vision and increased sensitivity to bright light for up to several hours after the examination — this is normal and will resolve on its own as the drops wear off.
• Wear sunglasses outdoors until your pupils return to their normal size; a pair is sometimes provided at the clinic.
• Do not drive or operate heavy machinery until your vision has fully returned to normal.
• Reading and close-up work may be difficult for the same period — plan accordingly.
• If your eyes feel uncomfortable, cold compresses or simply resting in a dimly lit room usually helps.
• No special diet, activity restrictions, or wound care is required after this examination.
• Your doctor will advise whether and when a follow-up fundoscopy or additional tests (such as retinal photography or optical coherence tomography — OCT, a detailed scan of retinal layers) are needed, based on the findings.
• If you notice sudden changes in your vision, new floaters, flashes of light, or eye pain after leaving the clinic, contact an eye doctor promptly, as these could indicate a separate issue unrelated to the examination itself.