🩺 Fundoscopy

Fundoscopy, or ophthalmoscopy, is the clinical examination of the interior of the eye (the fundus). It allows for the direct visualization of the retina, optic nerve head, and retinal blood vessels. This technique is indispensable for diagnosing primary ocular diseases and monitoring systemic conditions like hypertension and diabetes. Success requires mastery of the ophthalmoscope, correct positioning to avoid patient discomfort, and a systematic method to view all relevant posterior pole structures.

Fundoscopy is indicated in the assessment of visual loss, eye pain, or neurological symptoms such as headaches (to look for papilloedema). It is a vital screening tool for systemic diseases that affect the microvasculature, most notably diabetes mellitus (diabetic retinopathy) and hypertension (hypertensive retinopathy). It is also performed to investigate flashes and floaters (suspected retinal detachment) and as part of a comprehensive cardiovascular or neurological secondary survey. Evaluation of the 'red reflex' is essential in paediatrics to screen for congenital cataracts or retinoblastoma.

There are no absolute contraindications to direct fundoscopy, although it may be difficult or impossible in patients with severe photophobia or significant corneal opacity/dense cataracts. The use of mydriatic drops (like tropicamide) is contraindicated in patients with a known or suspected 'narrow-angle' or 'closed-angle' glaucoma, as it can precipitate an acute glaucomatous attack. Always check the anterior chamber depth or ask about glaucoma history before dilating. Direct fundoscopy is also relatively contraindicated in patients with recent intraocular surgery unless directed by an ophthalmologist.

A functioning direct ophthalmoscope with a bright, reliable light source and a range of apertures (small, large, and slit) is required. The device should have a dial to adjust the lenses (dioptres) to compensate for both the clinician's and the patient's refractive errors. Mydriatic eye drops may be used to dilate the pupils for a more comprehensive view, provided there are no contraindications. Alcohol wipes should be used to clean the brow rest of the ophthalmoscope before use on a patient.

Ensure the room is as dark as possible and ask the patient to look at a distant target. Stand about 15cm from the patient and observe the red reflex through the ophthalmoscope. Keeping the reflex in view, move closer until your forehead is almost touching your hand resting on the patient's brow. Find a retinal vessel and follow it 'upstream' (where the branches widen) to locate the optic disc. Once the disc is clear, inspect the four quadrants (superior-nasal, inferior-nasal, superior-temporal, and inferior-temporal) by asking the patient to look in those directions. Finish by inspecting the macula.

Assessment begins with the 'red reflex'; its absence suggests a cataract or vitreous haemorrhage. The optic disc is evaluated for contour (distinct margins), colour (pale vs. pink), and cup-to-disc ratio (normal is <0.3). Papilloedema is marked by blurred margins and loss of venous pulsation. Retinal vessels are assessed for A-V nipping or silver-wiring (hypertension). The retina itself is inspected for haemorrhages (dot-and-blot or flame-shaped), exudates (hard or soft/cotton wool spots), and neovascularization. Finally, the macula is checked for changes such as drusen (macular degeneration).

The most frequent error is failing to darken the room sufficiently, which prevents pupillary dilation and hinders visualization. Students often struggle with the 'red reflex' by moving too quickly or not checking it from a distance first. Another common mistake is using the wrong eye to examine the patient (e.g., using your right eye to look at the patient's left eye), which results in 'bumping noses' and an awkward position. Finally, clinicians often fail to ask the patient to look in specific directions to view the peripheral retina, focusing only on the optic disc.

Ask the patient to fixate on a distant point on the wall and keep both eyes open; this stabilizes the eye and dilates the pupil naturally. Warn the patient that the light will be bright and may be uncomfortable. When examining the right eye, use your right hand and your right eye; the opposite applies for the left eye. To find the macula, ask the patient to look directly into the light briefly at the end of the exam. If you lose the view, move back, re-establish the red reflex, and follow the vessel back to the disc.

Aligned with the MLA 'Ophthalmology' and 'Neurology' systems. Students must be able to recognize 'emergency' findings such as papilloedema, which requires urgent neuroimaging and specialist referral. Understanding the grading of diabetic retinopathy is a common AKT topic. Remember that fundoscopy is a high-yield OSCE station and success depends on a systematic approach: red reflex -> optic disc -> four quadrants of vessels -> macula.