presbyopia(redirected from old sight)
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Inability of the eye to focus sharply on nearby objects, resulting from loss of elasticity of the crystalline lens with advancing age.
pres′by·op′ic (-ŏp′ĭk, -ō′pĭk) adj.
(Pathology) a progressively diminishing ability of the eye to focus, noticeable from middle to old age, caused by loss of elasticity of the crystalline lens
[C18: New Latin, from Greek presbus old man + ōps eye]
pres•by•o•pi•a(ˌprɛz biˈoʊ pi ə, ˌprɛs-)
farsightedness due to ciliary muscle weakness and loss of elasticity in the crystalline lens, usu. associated with aging.
[1785–95; < Greek presby- (comb. form of présbys old, old man) + -opia]
pres`by•op′ic (-ˈɒp ɪk) adj.
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|Noun||1.||presbyopia - a reduced ability to focus on near objects caused by loss of elasticity of the crystalline lens after age 45|