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Originally Posted by Shamou  If we want to be rational about this... we could conclude that if prolonged computer usage was causing eye damage... half of North Americans and most of Europeans would be half-blind... so, since that is not the case... we can assume that there is no correlation between high computer usage and eye problems...
BTW... fifty years ago they used to say the same thing about reading... and one hundred years ago many people believed that if you read too much you could go insane... so much for popular opinion... 
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I have to disagree with you there Shamou. You can only make that assumption if you don't consider the many factors which could help some people resist developing eye problems. And if you ignore the possibility of many people getting by with some degree of damage, but not enough to be considered half-blind.
The apparent lack of huge numbers of half-blind people is not enough to make and judgment about a correlation or lack thereof.