presbyopia Meaning, Definition & Usage

  1. noun a reduced ability to focus on near objects caused by loss of elasticity of the crystalline lens after age 45
    farsightedness.

WordNet

Pres`by*o"pi*a
Etymology
NL., from Gr. old, n., an old man + , , the eye.
Definitions
  1. (Med.) A defect of vision consequent upon advancing age. It is due to rigidity of the crystalline lens, which produce 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.

Webster 1913