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a progressively diminishing ability of the eye to focus, noticeable from middle to old age, caused by loss of elasticity of the crystalline lens
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



diminution of the power of accommodation of the eye due to advancing years. Presbyopia occurs as a result of sclerosing of the crystalline lens, which is unable to increase its curvature to the limit when there is a maximum tension (accommodation); the result is that its refractive power decreases, and the ability to see objects close to the eye is impaired.

Presbyopia begins at age 40 to 45 when eye refraction is normal. When myopia is present, it begins later, and with hyperopia, it comes on earlier. Treatment consists in appropriate selection of glasses for reading and close work. Persons 40 to 45 years of age with normal refraction need a plus lens of 1.0 to 1.5 diopters for reading at a distance of 33 cm. Every five years the refractive power of the lens is increased by 0.5 to 1 diopter. Corresponding corrections in the lens power are made for myopia and hyperopia.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


Diminished ability to focus the eye on near objects due to gradual loss of elasticity of the crystalline lens with age.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
And in addition, we have a large group of presbyopes with increasingly active lifestyles and prolonged life expectancy who count on us to provide a good alternative to spectacle lens wear.
Malu (2013) (11) in their study found 249/482 (51.65%) subjects to be Emmetropic, 157/482 (32.57%)--Hypermetropic and 76/482 (15.76%) subjects myopic M Ghatak, H Sowbhagya, (2013) (12) found equal number of hyperopic presbyopes and myopic presbyopes.
Uncorrected Refractive Errors in Presbyopes attending medical college eye OPD.
Stereopsis in presbyopes fitted with single vision contact lenses.
The current generation of presbyopes have a different self-perception than that of their parents.
For patients who are only very early presbyopes (normally under the age of 55) and who do not fulfill the criteria for safe laser eye surgery, phakic IOLs represent another alternative.
* Why don't heterophoria angles change with and without glasses in most myopes, presbyopes and nonstrabismic hypermetropes?
Many presbyopes are fitter and more active than they were a generation ago.
We know that only about 8% of presbyopes who need visual correction wear contact lenses and only 1.2% wear multifocal contact lenses.
With improved surgical techniques and availability of improved biosynthetic materials the corneal inlay is an attractive option for presbyopes that seek spectacle independence.