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A heart attack is an emergency, but the condition that causes it usually takes years to develop. Over time, fatty substances collect on the walls of the heart's arteries. As these arteries become narrower, it's more likely that one will become fully clogged, causing a heart attack.

As you age, you are more likely to get flashes and floaters in your vision. Here is an explanation of what these are and when to get medical care.

Most often, seeing a few flashes and floaters is normal. Some people may notice them for a while after eye surgery. Most flashes and floaters need no treatment. But sometimes they can be signs of a serious eye problem.

Glaucoma is an eye disease that can cause blindness. It often begins when pressure builds up in the eye. If caught early, it can often be controlled. But it often has no symptoms, so you need regular eye exams.

Treatment can prevent or limit vision loss from glaucoma. The goal of treatment is to control glaucoma by lowering eye pressure. Medicines and procedures may also help.

Diabetic retinopathy is a disease that can lead to blurry, distorted vision or even blindness. It happens when diabetes harms blood vessels on the retina at the back of the eye.

Treatment may help slow the progress of diabetic retinopathy. Your treatment plan depends on your condition. You may need frequent exams to watch for changes. You may also need laser treatment and other procedures. Here's what you need to know.

AMD is the leading cause of vision loss in adults over age 50. Learn about the 2 types of AMD and how to spot the symptoms.

The retina is the inside lining of the eye. It turns light into nerve signals. These signals are then sent to the brain where they become the images you see. The retina may be torn or detached due to aging, an eye injury, or other problems. Tears and detachments are painless.