The Presbyopia reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Presbyopia

Presbyopia is a condition that occurs with growing age and results in the inability of the human eye to focus on objects in varying distances. Prebyopia is most likely the result of a decrease in the flexibility of the eye's lens; a loss of power of the ciliary muscles (the muscles that bend and straighten the lens) is also believed to contribute to this condition. Presbyopia is not a disease as such, but a condition that affects everyone at a certain age. The first symptoms are usually noticeably at the age of 40-50. Presbyopia cannot be cured, but the loss of focusing ability can be compensated by wearing glasses with varying power, so-called multifocal lenses or progressive addition lenses.

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