Age-related macular degeneration (AMD) is an eye disease that develops in people over the age of 50. It affects your ability to see what is directly in front of you (central vision). It's the most common cause of sight loss in people over 60.
When light travels through your pupil it's focused onto your retina, which is at the back of your eye. The retina sends signals to your brain that are interpreted as vision. The macula is a small area about the size of a pinhead, in the centre of your retina that processes sharp, clear vision. When you look directly at something, the light is focused on the macula, allowing you to see fine detail and colour.
With AMD, the macula cells become damaged which leads to a gradual loss of your central vision. Your peripheral (side) vision isn’t usually affected, which means it’s unusual to lose your sight completely if you have AMD.
In the UK, around 500,000 people are thought to be affected by AMD.
AMD often affects both eyes although it may affect one eye before the other. AMD isn't a painful condition and you may not notice any symptoms at first.
Your symptoms may develop slowly over several months, but sometimes this happens more quickly. Symptoms vary from person to person, but many people first notice a change in their ability to see detail, for example when reading.
Other symptoms include:
If you have any of these symptoms, arrange to have an eye test with an optometrist (a registered health professional who examines eyes, tests sight and dispenses glasses and contact lenses).
No one knows exactly what causes AMD, although it's more common as you get older. However, there are a number of factors that can make AMD more likely. These include:
If you notice any changes to your vision, make an appointment to see an optometrist. He or she will check your vision and examine your eyes. To get a good view of your eye your optometrist may use eye drops. These can blur your vision so don’t drive straight after the eye examination.
If your optometrist thinks you may have AMD, he or she will refer you to your GP or an ophthalmologist (a doctor who specialises in identifying and treating eye conditions).
You may have other tests listed below.
Currently there is no cure or treatment for dry AMD. Some research has shown that taking large doses of vitamin A, C, E and the mineral zinc may help to slow down the development of dry AMD.
There are a number of things you can try that may help with your AMD. If you carry out close, detailed work you can use visual aids, such as advanced magnifying glasses. By making things bigger, brighter and more colourful you will make things easier to see.
There are a number of treatments available for wet AMD. These mainly work by stopping new blood vessels from growing. This means that it’s important to start treatment as soon as possible. If blood vessels grow for too long they can scar your retina and this scarring can’t be treated.
Your ophthalmologist can inject medicines called anti-vascular endothelial growth factor (anti-VEGF) into your eye, which can help to prevent wet AMD from getting worse and even restore some lost vision. They work by stopping new blood vessels growing.
You will probably need to have more than one injection. Most people have three monthly injections, after which time your eye is monitored to see if you need further treatment.
The procedure is called an intravitreal injection. Before the injection, you will be given anaesthetic eye drops to make your eye numb. The injection shouldn't be painful but your eye may be sore after the anaesthetic wears off.
Anti-VEGF treatment usually works well and in most people it stops sight getting worse. About four out of 10 people also see an improvement in their vision.
The main complications of anti-VEGF treatment are a rise in pressure in your eye, a detached retina and eye infections. These happen to a small number of people (less than one in 100 people having the treatment).
This doesn't restore your vision, but it can help stop wet AMD from getting worse. Your ophthalmologist will inject a special light-sensitive dye into your arm, which then travels to your retina. He or she will then focus a low-energy, cold laser on the macular area of your retina. This destroys the abnormal blood vessels, without affecting the surrounding tissue.
You can help reduce your chances of developing AMD by:
Produced by Dylan Merkett, Bupa Health Information Team, November 2012.
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