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I am eye case what is the meaning of cylindrical n spherical power?
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Hi. A purely spherical lens is for correcting nearsightness or farsightedness. If this is the only problem you have, then this is the only parameter needed to create your lens. We're talking about a simple convex (farsightedness) or concave lens (nearsightedness). A person with an astigmatism has an irregular shaped cornea or internal lens of the eye. To adjust for this, a corrective lens may need to vary in thickness across it's surface rather than being symmetrical.
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