Dr. JD Ferwerda, MD
Dr. JD Ferwerda, MD: Dutch-trained ophthalmologist specialising in cataracts, lens exchange, retinal disease, glaucoma, and AMD.
AMD affects the macula, the part of the retina responsible for detailed central vision. Early disease may not cause noticeable symptoms. New waviness, a blurred or blank area in the centre of vision, or any rapid change in one eye should be assessed promptly.
Book promptly if straight lines begin to look wavy, a blurred or blank patch appears centrally, or vision changes rapidly in one eye.
Blurred or fuzzy central vision
Straight lines look wavy or bent
A grey, dark or blank area centrally of sights
Colours appear less vivid
Difficulty reading small print
Faces become harder to recognise
More light is needed for detailed tasks
A new difference in vision between the two eyes
The Amsler grid can help you notice new distortion in central vision when used one eye at a time. It does not diagnose AMD, show the disease stage or replace a dilated retinal examination and OCT.
Hold your screen at normal reading distance — about an arm's length (35–40 cm). If you wear reading glasses, put them on. You'll check each eye separately, so have a hand free to cover one eye at a time.
Cover your left eye gently with your hand. With your right eye, look at the dot in the centre of the grid and keep your gaze fixed on it. Without moving your eye, take in the grid around it.
While keeping your gaze on the central dot, do all the lines around it look straight and evenly spaced — or do you notice anything unusual?
Cover your right eye. With your left eye, look at the central dot again and keep your gaze on it.
Same question, on this side. Keeping your gaze on the dot, do all the lines look straight and evenly spaced — or do you notice anything unusual?
This self-check is for guidance only. It does not diagnose AMD and does not replace a clinical examination or OCT imaging. A normal result does not rule out early AMD.
Early AMD may not affect everyday vision. One eye can also compensate for changes in the other, making gradual loss difficult to notice. A dilated retinal examination and OCT can identify macular changes, establish a baseline and show whether closer monitoring is needed.
AMD comes in two forms
dry, which progresses slowly, and wet, which can change vision fast.
Dry AMD is the more common form. It usually develops gradually as the macula changes with age and is described as early, intermediate or late. Early stages may not affect day-to-day vision, which is why examination and imaging matter.
Wet AMD is a late form in which abnormal blood vessels grow beneath the retina and leak fluid or blood. It can cause a faster change in central vision. Anti-VEGF eye injections are the main treatment for wet AMD and may be recommended after examination and retinal imaging confirm the diagnosis.
A specialist examination can confirm the type and stage of AMD
Monitoring, healthy lifestyle choices and risk-factor management
AREDS2 supplements may help reduce the risk of progression in appropriate patients.
Anti-VEGF eye injections are the main treatment.
Advanced vision loss — vision rehabilitation and low-vision support can help maintain independence and everyday function.
If straight lines have suddenly become wavy, a central blank area has appeared or vision has changed rapidly in one eye,
arrange a prompt retinal assessment.
Dr. JD Ferwerda, MD: Dutch-trained ophthalmologist specialising in cataracts, lens exchange, retinal disease, glaucoma, and AMD.
Russian-trained refractive and general ophthalmologist, leads lasik/ laser vision correction at EEC