Condition Library
Macular Degeneration
Macular degeneration is the leading cause of severe central vision loss in adults over fifty. It affects the macula, the small area at the centre of the retina that handles reading, faces, and any task needing fine detail.
There are two forms and the distinction matters enormously. Dry AMD is far more common and progresses slowly over years. Wet AMD, where abnormal blood vessels grow and leak beneath the retina, can cause severe loss within weeks and is treatable with injections that work far better the sooner they start.
Symptoms
- Straight lines appearing wavy or bent, which is often the earliest noticeable sign
- A blurred or blank spot in the centre of vision
- Difficulty recognising faces
- Needing more light to read
- Colours appearing less vivid
- Sudden worsening of any of these, which suggests wet AMD and needs urgent assessment
Causes and risk factors
- Age over fifty, with risk rising steeply after sixty-five
- Smoking, the single largest modifiable risk factor
- Family history and specific genetic variants
- High blood pressure and cardiovascular disease
- Cumulative ultraviolet exposure, which is elevated in Arizona
- Obesity and a diet low in leafy greens and omega-3
Treatment
- For wet AMD, anti-VEGF injections into the eye, which are highly effective and time-sensitive
- For intermediate dry AMD, AREDS2 formulation supplements, which reduce the risk of progression
- Stopping smoking, which has the largest effect of any modifiable factor
- Blood pressure control and cardiovascular risk management
- Home monitoring with an Amsler grid to catch change between appointments
- Low vision rehabilitation to preserve reading and daily function
Reducing your risk
- Stop smoking. By a considerable margin this is the largest modifiable risk factor for both developing macular degeneration and for it progressing.
- Control blood pressure and cardiovascular risk, since the vascular health that protects your heart protects your retina.
- Eat leafy green vegetables and oily fish regularly, which supply the carotenoids and omega-3 the macula uses.
- Wear sunglasses with full ultraviolet protection consistently. Cumulative UV is a contributing factor and in Arizona it is unusually high.
- Use an Amsler grid daily if you have been diagnosed, and report any change the same day.
- Take AREDS2 supplements only if your stage warrants them. They have not been shown to prevent macular degeneration in people who do not have it.
Common misunderstandings about macular degeneration
- That it causes total blindness. It does not. AMD damages the macula and characteristically spares peripheral vision, so people retain the ability to move around independently. What is lost is reading, faces and fine detail, which is a serious loss and a different one.
- That nothing can be done. For wet AMD, injections are genuinely effective and have transformed outcomes over the last two decades. For dry AMD, supplements at the right stage reduce progression risk, and low vision rehabilitation restores specific abilities even when the disease itself cannot be treated further.
- That AREDS2 supplements prevent AMD. They do not, and the evidence does not support taking them prophylactically. They reduce the risk of progression in intermediate dry AMD or advanced disease in one eye. Taking them without that indication is spending money for no established benefit.
- That it is purely genetic and therefore not worth changing anything. Smoking is a large modifiable risk factor, and blood pressure, diet and ultraviolet exposure all contribute. Genetics loads the dice and does not throw them.
How macular degeneration is detected and staged
The earliest sign is usually drusen, small yellowish deposits under the retina, visible on examination or on a retinal image well before a patient notices anything. Their number, size and character determine the stage, and staging matters because it decides whether supplements are appropriate and how often you should be reviewed.
Retinal imaging is particularly valuable here. Drusen change slowly, and comparing this year's image against images from three and five years ago shows a trajectory that no single examination can. Where wet AMD is suspected, we refer for the imaging and treatment that confirm and address it, and that referral is urgent rather than routine.
Monitoring at home, and what to do about a change
An Amsler grid is a simple square of straight lines you look at daily, one eye at a time, with your reading glasses on. If lines start to look wavy or bent, or a blurred or missing patch appears, you contact us the same day. It costs nothing and it is the single most effective home monitoring tool available.
The reason for the urgency is specific. Wet AMD is treated with injections that work considerably better the sooner they start, and the difference between reporting a change in a week and reporting it in two months can be the difference between preserving reading vision and not.
Beyond monitoring, the evidence supports not smoking above everything else, controlling blood pressure, eating leafy greens and oily fish, and protecting your eyes from ultraviolet light, which in this climate means wearing proper sunglasses consistently rather than occasionally.
When to see an optometrist
Book an exam if you are over fifty and have not been checked in a year, or if you notice any distortion in straight lines. Contact us urgently for sudden central vision change or a new blank spot, which may indicate wet AMD.
Related conditions
This page is general educational information, not medical advice or a diagnosis. It is not a substitute for an examination. If you are experiencing sudden vision loss, eye pain or an eye injury, contact us immediately or go to an emergency room.
Macular Degeneration questions
Will I go completely blind from macular degeneration?
Almost certainly not. AMD takes central vision and characteristically spares peripheral vision, so people retain the ability to move around independently. What is lost is reading and face recognition, which is exactly what low vision rehabilitation addresses.
What is the difference between dry and wet AMD?
Dry is far more common, progresses slowly over years, and is managed with supplements and risk factor control. Wet involves abnormal blood vessels leaking under the retina, can cause severe loss within weeks, and is treated with injections that work best when started immediately.
Do AREDS2 supplements help everyone?
No. The evidence supports them for intermediate dry AMD or advanced disease in one eye. They have not been shown to prevent AMD in people who do not have it. We tell you whether they apply to your specific stage.
What is an Amsler grid?
A simple grid of straight lines you look at daily, one eye at a time, at home. If lines start appearing wavy or a spot appears, you contact us immediately. It is the cheapest and most effective home monitoring tool for AMD.
Book an appointment with a doctor who has time for you
We schedule 2 patients an hour, so your exam is unhurried and your questions get answered. Most patients are seen within a few days.