You can buy reading glasses cheap, without a prescription. You only have to know a single number, such as 1.75 or 3.50, indicating how powerful the reading glasses should be, according to how bad your eyesight is.
What does an ordinary eyeglasses prescription look like? Does it have more than one such number? One for each eye, or what? Are they the same kind of numbers? What do they mean, in terms of units of measure or whatever?
2007-12-21
18:04:53
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5 answers
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asked by
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Health
➔ Optical
Do some people successfully wear reading glasses in place of ordinary eyeglasses, because their prescription just happens to coincide with them? In that case, what advantage would that particular person get from ordinary eyeglasses?
2007-12-21
20:03:53 ·
update #1