Definition: A condition common after age 40 in which a gradual lessening of the eye's power of accommodation causes difficulty in seeing near objects. Presbyopia is usually the cause of why people need reading glasses or bifocals after the age of 40.
Presbyopia
By Troy Bedinghaus, O.D., About.com Guide
Updated: January 15, 2009
About.com Health's Disease and Condition content is reviewed by the Medical Review Board
Explore Vision
Must Reads
About.com Special Features
8 Ways to Cut Drug Costs
Learn how to save money on medications with these recommendations. More >
Healthy Bodies, Healthy Minds
Keep yourself, and your family, happy and healthy this fall with these tips. More >
Also from About.com:
©2009 About.com, a part of The New York Times Company.
All rights reserved.