How do glasses help people see from far and near?

Answer:
It has to do with the curvature of the lenses-whether or not they are convex or concave. That helps your eye to compensate for problems with diverging and converging. (When the eye is too strong or not strong enough.)

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the way the lens are cut and reflect sight

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http://en.wikipedia.org/wiki/lens_(optic...

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The way the lens are made...they adjust and correct the vision problem.

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