Like any heavily used item, all bodily parts worsen and weaken with age. We use our eyes every day, the muscles weaken so sight deteriorates even without any disease. The leading cause of vision loss in adults over 60 is mascular degeneration but this will not lead to blindness.
The macula is a small area of the retina controlling central vision and the ability to see fine details. Formation of deposits or abnormal blood vessels under the retina cause the degeneration.
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