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This information is provided by an independent source. Merck & Co., Inc. is not responsible for this content. Please discuss any and all treatment options with your healthcare professional. The manufacturer of a product generally has the most complete information about that product.

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presbyopia (pres″be-o´pe-ә) lessening of accommodation of the lens of the eye, a process that happens normally with aging and usually results in farsightedness (hyperopia). It is caused by a loss of elasticity in the crystalline lens, which focuses images on the retina with the aid of muscles that stretch it to make it less convex or relax it to make it more spherical (more convex). adj., presbyop´ic., adj.

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