It is caused by damage to the blood vessels in the eyes, and results in gradual vision loss and blindness.
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Related: gradual
Prev: The biggest concern of pumping out water from this deep is the gradual settling down of the land surface.
Next: Friendships are not made in a day, and the computer would be more acceptable as a friend if it simulated the gradual changes that occur when one person is getting to know another.
