Guide to Common Eye Disorders
Floaters are small specks, strands or clumps or aggregates of cells that move through a person’s field of vision. Flashes, as the name suggests, are sudden flashes of light or "lightning streaks." Both are caused by changes related to aging that take place in the vitreous. Flashing lights may be associated with high nearsightedness and could indicate a serious retinal problem.
The vitreous is the gel-like fluid that fills the eyeball. Around middle age, this gel may begin to thicken, and as it does, small clumps or strands of cells may form. These clumps get in the way of the light entering your eye and cause you to see floaters. Some will fade after a time, but other floaters remain for years.
Important: If a new floater appears suddenly or if any flashes are noticed — even if you have had them for years — see your ophthalmologist immediately. It could indicate a retina problem.
Flashes are caused when the shrinking vitreous pulls at areas of the retina where it is tightly adhered. This pulling or tugging pressure on the retina produces a sensation of light, similar to when you press the side of your eye with your finger. Again, if you experience sudden flashes, see an ophthalmologist immediately. This could indicate a retinal tear or detachment, which is a sight threatening condition.
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