Vitreous floater: You may have a vitreous floater. The clear gel that fills eyeball is normally attached to all parts of the inside of the eye. With age, it can become more liquid (watery) and detaches from the back of the retina causing your "dark curtain" floater. This can also reult in a retinal tear or detachment. You should see your eye doctor to check the retina for this, hemorrhage (blood) or retinal tear.
Answered 12/9/2013
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