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Correlation is not necesarilly causation. It may be that the same group of guys who need Viagra are also succeptible to blindness because of the blockages in the tiny blood vessels in their eyes. Many diabetic and pre-diabetic people have this problem and these same people are often ood candidates for Viagra due to E.D. which also is caused by blockages in the chambers that fill with blood that feed the penis to give you an erection.
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