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Old 09-02-2016, 03:00 PM
Chronos Chronos is online now
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Quote:
Quoth mixdenny:

Not really, they correct vision.
They correct close-up vision. They do not correct distance vision, and in fact will usually make it worse. Vision is not a one-size-fits-all thing to correct: Your eye needs to focus differently to see distant things clearly than to see nearby things. Most of us, when we're young, our eyes can change shape slightly to get this change in focus, but as we age, that ability is often diminished or lost, and so we need to use different glasses for near and far vision to compensate.