types of eyeglass lenses

The type of lenses used in eyeglasses depends on the type of vision problem and may include:
•    Concave lenses are thinnest in the center. Used to correct nearsightedness (myopia), the numerical prescription in diopters is always marked with a minus (-) symbol.
•    Convex lenses are thickest in the center, like a magnifying glass. Used to correct farsightedness (hyperopia), the numerical prescription in diopters is always marked with a plus (+) symbol.
•    Cylindrical lenses curve more in one direction than in the other and are often used to correct astigmatism.
 

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