Dry AMD is the most common form of the condition and develops slowly, eventually leading to loss of central vision.
Wet AMD is caused by leaky blood vessels inside the eye. It is less common than dry AMD but it can cause more rapid loss of vision. It is responsible for 90% of cases of severe vision loss.2 The World Health Organisation names AMD as one of the leading causes of sight loss in the developed world.3 It results in new, weak blood vessels growing behind the retina. These cause bleeding and sometimes scarring.4 The good news is that while wet AMD can develop quickly,5 in the majority of cases, if diagnosed and treated early, as much sight can be saved as possible and some people may even see an improvement.6
It is common for patients to develop the more severe form of wet AMD after first developing dry AMD. What is more, AMD can develop in one eye first with no noticeable effects, as the second, good eye, compensates. Often, it is only when the second eye develops symptoms that a problem becomes apparent. This could be too late to treat the first eye. That is why, if you are over 50, the Association of Optometrists Ireland recommends that you have a comprehensive eye check every 2 years.7
What Causes AMD?
The exact causes of AMD are still unknown. Although there can be a history
of the condition in certain families, AMD is still not believed to be genetic.
However, if close relatives have suffered with sight loss in the past, then
it may be worth getting your eyes checked more regularly.
Studies have shown a definite link between smoking and AMD. Other factors such as high blood pressure and poor diet can also lead to a greater risk of getting AMD. Vitamins (C & E), beta-carotene, copper and zinc supplements in your diet, can help reduce the risk of developing AMD.
There are many risk factors for AMD, some out of your control, such as age, family history, race and gender. However, there are some steps you can take now to help protect your sight from AMD.
Studies have shown that if you smoke you are twice as likely to develop macular degeneration.8
Regular eye tests
If you are aged 50 or over it is important that you go for regular eye tests for AMD. It is recommended that you go every two years.7 And, in particular, to make sure the back of your eye is checked. Regular tests are also essential for drivers, if your occupation depends on having good vision, and if you have certain medical conditions, such as diabetes, glaucoma or high blood pressure.
How AMD can affect your sight
AMD is progressive, it is also painless. While AMD may affect your detailed central vision, most people still retain useful side (or peripheral) vision.5 However if left untreated 17% of people will progress to advanced AMD within five years.9
Key symptoms of AMD include:
- Distortion, where straight lines may appear wavy or bent. For example, tiles in the bathroom appear wavy
- Difficulty in reading or doing any other activity which requires fine vision
- Difficulty in distinguishing faces
- Dark patches or empty spaces, which appear in the centre of your vision
- The need for increased illumination, sensitivity to glare, decreased night vision and poor colour sensitivity
Vision Distortion is an early symptom of Wet AMD
Wet AMD decreases sensitivity to contrast
|Advanced Wet AMD will create a permanent blind spot in your central vision.|
But, please, remember. If you notice any change in your vision, see an eye care professional immediately.
How AMD can affect your life
If left untreated AMD can affect your everyday life. In severe cases often associated with wet AMD, the more rapid and destructive form, you can lose your independence and have to rely on friends, family and carers to help you.
Getting around would be a major ordeal: bus numbers would be hard to read; you may not be able to drive. And you would not be able to see the faces of the people you love the most. For most people hobbies such as reading, watching TV, completing crosswords, painting and close up work, become very difficult.
As we have mentioned here before, the good news is that in some cases, early treatment of AMD can save, and even improve your sight.6 Most people still retain useful side (or peripheral) vision.5
AMD Awareness Week
September 22nd to 30th 2012
Novartis in association with
is supporting an awareness campaign on AMD