Not many people think about it but contact lenses are classified as medical devices. Millions of people use them. Thousands have problems because of them. The best way of ensuring safe contact lens wear is to explain the dangers of contact lens wear on a physiological basis. The front surface of the eye is the cornea. It is clear. It has to be clear or otherwise light couldn't reach the retina to be sensed. But clear is a problem for living tissue. Because in order to be clear, no blood can be in the tissue. And blood is what normally brings living tissue its oxygen. So if there is no bloo...
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