Presbyopia

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  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}.
     [1913 Webster]

From WordNet (r) 2.0 [wn]:

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