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The Collaborative International Dictionary
Presbyopia

Presbyopia \Pres`by*o"pi*a\[NL., from Gr. ? old, n., an old man + ?, ?, the eye.] (Med.) 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.

Douglas Harper's Etymology Dictionary
presbyopia

"far-sightedness brought on by age," 1791, medical Latin, from Greek presbys "old man" (see presby-) + -opia, from ops "eye" (see eye (n.)). Related: Presbyopic.

Wiktionary
presbyopia

n. inability of the eye, due to ageing, to focus on nearby objects; farsightedness

WordNet
presbyopia

n. farsightedness resulting from a reduced ability to focus caused by loss of elasticity of the crystalline lens with age

Wikipedia
Presbyopia

Presbyopia is a condition associated with aging in which the eye exhibits a progressively diminished ability to focus on near objects. The first signs of presbyopia – eyestrain, difficulty seeing in dim light, problems focusing on small objects and fine print – are usually first noticed between the ages of 40 and 50.

Presbyopia's exact mechanisms are not fully understood; research evidence most strongly supports a loss of elasticity of the crystalline lens, although changes in the lens's curvature from continual growth and loss of power of the ciliary muscles (the muscles that bend and straighten the lens) have also been postulated as its cause. It is a type of refractive error.

The word is from Greek presbys (πρέσβυς) = old man + ops (ὤψ) = see like, sight > meaning literally trying to see as old men do.

Usage examples of "presbyopia".

This recession of the near point with age is called presbyopia (prez'bee-oh'pee-uh.

They were for presbyopia, she guessed, and she had already noticed he was slightly lame in the off hind leg.