Thin Lenses for Strong Prescriptions: What You Are Actually Paying For
5 October 2026
12:20
The first sign is rarely blur. It is usually a straight line that has stopped being straight. A door frame with a slight bow in it, a line of text that dips in the middle, the edge of a bathroom tile that kinks when you look right at it.
That is the macula telling you something, and it is worth knowing what, because one form of macular degeneration is slow and the other is not. Which one you have decides whether you book a routine appointment or pick up the phone today.
The macula is a small area at the centre of the retina, and it does nearly all of your detailed seeing. Reading, recognising faces, threading a needle and checking a number plate all happen there. Your side vision comes from the rest of the retina.
So when the macula is damaged, you do not go blind in the way people fear. You keep your side vision and can still get around a room. What you lose is the detail in whatever you are looking straight at, which is why it is such a frustrating condition to live with.
Age-related macular degeneration, usually shortened to AMD, comes in two forms.
Dry AMD can turn into wet AMD, which is why anyone with early dry changes should know the warning signs below.
In the early stages there are often no symptoms at all, particularly if one eye is doing the work for both. That is the reason I ask people to cover each eye in turn now and then. Problems in one eye hide very well behind the other.
Early AMD shows up as small yellow deposits under the retina called drusen. You cannot feel them and they usually cause no symptoms, but I can see them when I examine the back of your eye.
An OCT scan goes further. It gives me a cross-section through the layers of the macula, so I can see fluid or swelling under the surface that a photograph would not show. That is how early wet AMD is picked up, sometimes before the patient has noticed a change. I include it in every eye examination rather than charging for it as an extra, and I have explained what it shows in what an OCT eye scan is.
The scan also gives us a record. Next time you come in, I am comparing your macula with how it looked before, which tells me far more than a single picture.
I refer you urgently to the hospital eye service. Treatment is a course of injections into the eye that stop the abnormal vessels growing and leaking. It sounds worse than it is, and for many people it holds their vision steady for years. Where something else needs a quick specialist opinion I can also arrange a private referral.
There is no treatment that reverses it, so the aim is to slow it and to make daily life easier.
Plenty of people arrive worried about macular degeneration and leave with a different answer. Cataracts dim and blur everything and are very treatable. Glaucoma affects side vision first, the opposite pattern to AMD. Sometimes it is simply an out-of-date prescription.
If you are reading this about a parent, the changes you notice from the outside can look like memory problems, which I have written about in vision, memory and getting older. And if driving is the worry, the standard you have to meet is set out in eyesight and driving.
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Often there is no sign at all in the early stages. When symptoms do appear, the most typical first one is distortion: straight lines such as door frames or lines of text look wavy or bent. Others include a smudge in the centre of your vision, needing brighter light to read, and difficulty recognising faces.
Dry macular degeneration is the more common form and develops slowly, usually over years, as the cells of the macula wear out. Wet macular degeneration is caused by abnormal blood vessels leaking under the macula and can reduce central vision within weeks or days. Wet AMD is treatable with injections but needs to be treated quickly.
Sudden distortion or a new dark patch in your central vision should be seen the same day, because it can be a sign of wet macular degeneration. Ring an optometrist rather than your GP, as going through a GP adds delay. Gradual change over months is not an emergency but should still be examined.
Yes. An optometrist can see the early deposits, called drusen, when examining the back of the eye. An OCT scan shows a cross-section through the macula and can reveal fluid under the surface, which is how early wet macular degeneration is detected, sometimes before symptoms are noticed.
Macular degeneration affects central vision, which is used for reading, faces and fine detail. It does not affect side vision, so it does not cause total blindness. Many people with dry AMD keep useful reading vision for years, and treatment for wet AMD holds vision steady for many patients when it is started early.
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