By Melinda Beck
Wall Street Journal
There isn't a name for it and few eye doctors test for it. But many people are having trouble seeing in the middle distance that demands so much of our focus.
Some 80% of us use computers, staring intently on screens set well between typical distance and reading range, often for many hours each day. Add in laptops, pagers, e-readers, smartphones, personal-digital assistants and hand-held video games, each with its own optimum distance and tiny flickering screen, and the demands on human eyes today would baffle even Benjamin Franklin, inventor of the bifocal in the late 18th century.
Wall Street Journal
There isn't a name for it and few eye doctors test for it. But many people are having trouble seeing in the middle distance that demands so much of our focus.
Some 80% of us use computers, staring intently on screens set well between typical distance and reading range, often for many hours each day. Add in laptops, pagers, e-readers, smartphones, personal-digital assistants and hand-held video games, each with its own optimum distance and tiny flickering screen, and the demands on human eyes today would baffle even Benjamin Franklin, inventor of the bifocal in the late 18th century.
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