Hypoxia occurs when the
cornea does not get enough oxygen. It is the most
common complication of contact lens wear, especially extended-wear
The cornea has no blood supply of its own, so it gets oxygen only
from tears and directly from the atmosphere. A contact lens reduces the oxygen
supply to the cornea, making the cornea swell. Wearing contacts overnight
further decreases the amount of oxygen that gets to the cornea.
Eye floaters are small moving spots that appear in your field of vision. They may be especially noticeable when you look at something bright, such as white paper or a blue sky.
Eye floaters can be annoying, but they generally don't interfere with your sight.
Occasionally a particularly large eye floater may cast a subtle shadow over your vision. But this tends to occur only in certain types of light.
Most of the time people learn to live with eye floaters and ignore them. And they often improve...
Gas-permeable hard contact lenses have almost eliminated some
problems, such as overwearing syndrome and corneal clouding. Problems that still occur include hazy vision caused by mild corneal swelling
(edema) or warping. Over time, corneal hypoxia may cause serious problems with
Primary Medical Reviewer
Kathleen Romito, MD - Family Medicine
Specialist Medical Reviewer
Christopher J. Rudnisky, MD, MPH, FRCSC - Ophthalmology
June 24, 2011
WebMD Medical Reference from Healthwise
June 24, 2011
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