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1. (n.) presbyopia
farsightedness due to ciliary muscle weakness and loss of elasticity in the crystalline lens, usu. associated with aging.
Etymology: (1785–95; < Gk presby- (comb. form of présbys old, old man) + -opia)
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| Definition of 'presbyopia' |
Princeton's WordNet |
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1. (noun) presbyopia, farsightedness
a reduced ability to focus on near objects caused by loss of elasticity of the crystalline lens after age 45
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| Definition of 'presbyopia' |
Webster Dictionary |
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1. presbyopia
a defect of vision consequent upon advancing age. It is due to rigidity of the crystalline lens, which produces difficulty of accommodation and recession of the near point of vision, so that objects very near the eyes can not be seen distinctly without the use of convex glasses. Called also presbytia
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| Definitions of 'presbyopia' |
The Nuttall Encyclopedia |
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1. presbyopia
diminution of sight due to age, occurring usually about forty-five, when near objects are less distinctly seen than distant, an affliction due to the flattening of the lens.
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| Definition of 'presbyopia' |
U.S. National Library of Medicine |
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1. presbyopia
The normal decreasing elasticity of the crystalline lens that leads to loss of accommodation.
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Definitions of presbyopia 
