Definition of "presbyopia" []

• Inability of the eye to focus sharply on nearby objects, resulting from loss of elasticity of the crystalline lens with advancing age. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "If you experienced 20-20 or better vision for most of your life, and now have age-related loss of vision, otherwise known as presbyopia, you wear "reading glasses.""
• "The inability to focus on close objects, known as presbyopia, is a natural part of aging that occurs when the lenses of the eyes become less flexible."
• "And when you hit 40, that inability to see near—called presbyopia—becomes a bigger problem, meaning that you may need bifocals, or different lenses for seeing close and far."