How do glasses work? |

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When light from an object reaches our eyes, the cornea and lens refract the light. In a person having perfect vision, the refracted light is accurately focused on the retina. The retina then sends information to the brain, informing it about the object.

However, in some people, the light does not get properly focused on the retina causing blurry vision. When light gets focused before the retina, the defect is called myopia. Myopia can be corrected using glasses having concave lenses. Whereas, when light gets focused behind the retina, the defect is called Hyperopia or hypermetropia. Hypermetropia can be corrected using glasses having convex lenses. Apart from these, there are other defects also like presbyopia and astigmatism which can also be corrected using glasses having appropriate lenses.