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Dry AMD is a form of the disease which comes on slowly over several years while wet AMD can cause blindness within three months. Dry AMD usually develops after the age of 50 and is caused by the growth of new blood vessels over the macula, a small oval-shaped area at the back of the eye that helps us pick out visual details clearly. These blood vessels leak fluid, causing scar tissue to form and destroying vision in the centre of the eye, making it difficult to recognize faces, read or watch television.
Recent research has found the condition is partly caused by reduced blood flow to the choroid, a vital layer of tissue that sits in front of the retina and some small earlier studies had suggested Viagra can improve blood flow to this tissue. Recent research found the condition is partly caused by reduced blood flow to the choroid, a vital layer of tissue that sits in front of the retina. Studies have suggested Viagra can improve blood flow to this tissue.
In the study, five elderly patients with AMD were given two Viagra pills a day for two years. The results showed the drug improved vision for one participant and completely halted deterioration for the others. Some drugs can already slow progression of AMD and increase vision in some cases, but the medicines have to be injected into the back of the eye every month.