Age-related macular degeneration, a common cause of blindness, has been linked to an increased risk of heart attack and stroke.
Researchers found the risk of dying from the cardiovascular conditions was at least doubled in people with AMD.
The study raises the possibility - disputed by UK experts - that drugs for the condition may be to blame.
AMD affects the centre of the retina (macula) at the back of the eye, which is used for fine central vision tasks, such as reading and driving.
It is most common in the elderly, among whom it is a major cause of untreatable blindness in developed countries. It is estimated to affect 500,000 people in the UK alone.
source: BBC News
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