Slide show: Age-related vision problems
Illustration of the eye showing debris floating in the vitreous cavity
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Your eyeball is filled with a jelly-like substance called vitreous humor. As you age, the vitreous can become more liquid than jelly-like. When this happens, microscopic fibers within the vitreous tend to clump together (see arrows). These clumps can cast tiny shadows on your retina, which you may see as spots and specks (floaters) in your field of vision.

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