Age-Related Macular Degeneration: A Guide for Oman Patients and Families

Age-related macular degeneration (AMD) is the leading cause of irreversible central vision loss in people over 60 in high-income countries, and increasingly prevalent in Oman as the population ages. The central vision — used for reading, recognising faces, and driving — is affected while peripheral vision remains intact. Understanding AMD is urgent because the wet form can destroy central vision in weeks if untreated.

The macula and why it matters

The macula is the central 5mm of the retina, responsible for the sharp vision you use for anything you look directly at. It contains the highest density of cone photoreceptors. AMD damages and eventually kills these cells.

Dry AMD (85–90% of cases)

Drusen (yellow deposits of cellular debris) accumulate under the retinal pigment epithelium (RPE). In early and intermediate dry AMD, vision may be near-normal. In advanced dry AMD, large areas of RPE and photoreceptor death (geographic atrophy) produce a permanent blind spot in the centre of vision.

Progression: Slow — geographic atrophy advances about 1.7 mm² per year on average.

Treatment: No approved treatment that reverses damage. The AREDS2 supplement formula (lutein 10mg, zeaxanthin 2mg, vitamin C 500mg, vitamin E 400IU, zinc 80mg) slows progression to advanced AMD by about 25% in intermediate and advanced dry AMD patients. Available at pharmacies.

Wet AMD (10–15% of cases, but causes 90% of severe vision loss)

Abnormal blood vessels grow from the choroid under the RPE (choroidal neovascularisation — CNV). These leak fluid and blood, rapidly distorting and destroying central vision. Without treatment, a patient can go from 6/9 to counting fingers in 6–12 weeks.

Treatment: Anti-VEGF intravitreal injections — ranibizumab, aflibercept, or bevacizumab. Monthly initially, then extend-and-treat once stable. The evidence is clear: early treatment preserves vision; delayed treatment allows irreversible scarring.

Warning signs — call us the same day

• Sudden distortion of straight lines (use an Amsler grid at home)
• Grey or dark spot in the centre of vision
• Rapid deterioration in reading vision

Risk factors and what you can control

• Age and genetics: non-modifiable
• Smoking: doubles the risk of AMD — the single most important modifiable risk factor
• UV exposure: wear UV-blocking sunglasses from early adulthood
• Diet: Mediterranean diet (high fish, vegetables, olive oil) associated with lower AMD incidence
• Blood pressure: hypertension accelerates AMD progression

Monitoring at home: the Amsler grid

Every AMD patient should have an Amsler grid at home. Checking it daily with each eye separately takes 30 seconds. Any new distortion or missing area means call us that day — not next week.