Smile Optometrist - ✓Concave lenses are used in eyeglasses that correct myopia/short-sightedness. Because the distance between the eye's lens and retina is longer than it should be, such people are unable to
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What kind of curvature, internal and external, do you need in a lens to correct astigmatism? - Quora
What's the Difference Between Myopia and Hyperopia?