Definition of Presbyopia
Presbyopia is a condition in which the lens of the eye loses its ability to focus, making it difficult to see objects up close.
Causes, incidence, and risk factors
The lens of the eye needs to change its length or shape to focus on smaller objects, or objects that get closer or farther away. This is called the elasticity of the lens. This elasticity is slowly lost as people age. The result is a slow decrease in the ability of the eye to focus on nearby objects.
Signs and tests
The health care provider will perform a general eye examination, including measurements to determine a prescription for glasses or contact lenses.
Treatment
There is no cure for presbyopia, but it can be corrected with glasses or contact lenses. In some cases, adding bifocals to an existing lens prescription is enough. As the ability to focus up close worsens, the bifocal prescription needs to be changed.
Expectations (prognosis)
Vision can be corrected with glasses or contact lenses.
Review
Linda J. Vorvick, MD, Medical Director, MEDEX Northwest Division of Physician Assistant Studies, University of Washington School of Medicine; and FRanklin W. Lusby, MD, Ophthalmologist, Lusby Vision Institute, La Jolla, California. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc. – 5/24/2010
