According to my eye doctor, you cannot harm your eyes by using your eyes. One theory about lacemaker blindness is that many of the lacemakers, living in port towns, as most lace towns are, contracted venereal disease and this may have made them go blind. Of course there were probably other infections around as well. Another theory that I have heard is that when people age and their eyes lose the elasticity for focusing at different focal lengths, resulting in needing bi-focals, this may have been a bit of a career ender for people who had to focus at close distances for fine lace work and who didn't have bi-focals. So they may not have been blind so much as too blind at close distances to make lace anymore. I believe my eye doctor made the claim that this process by which your close distance focusing starts to deteriorate starts at 39 1/2 years of age. Devon
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