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presbyopiamore about presbyopia

presbyopia


  2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  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}. 
 
  From  WordNet  r  1.6  [wn]: 
 
  presbyopia 
  n  :  reduced  ability  to  focus  caused  by  loss  of  elasticity  of 
  crystalline  lens  with  age 




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