presbyopia

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presbyopia

a progressively diminishing ability of the eye to focus, noticeable from middle to old age, caused by loss of elasticity of the crystalline lens

Presbyopia

 

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.

presbyopia

[‚prez·bē′ō·pē·ə]
(medicine)
Diminished ability to focus the eye on near objects due to gradual loss of elasticity of the crystalline lens with age.
References in periodicals archive ?
Uncorrected Refractive Errors in Presbyopes attending medical college eye OPD.
The dynamic focusing lens that Pixel has invented and is developing for commercialization could represent the most significant advance in eyeglasses for presbyopes (those over 45 yrs.
This article will approach the subject systematically beginning, with paediatric fitting and then exploring the opportunities available to adults, presbyopes and the over 60s, thereby looking at the benefits provided by contact lenses throughout the lifetime of our patients.
Two powerhouse industry and consumer brands are now working together to provide presbyopes with a new choice.
Continua(TM) D28 bifocal lenses offer presbyopes a terrific value," continues Vierzba.
The fluid-filled lens, once adjusted by the dial, gives presbyopes a more natural way of seeing the world, he concluded.
In the past, presbyopes relied on vanity-crushing bifocals or reading glasses, but Dr.
However, there are a growing number of emmetropic presbyopes who are reluctant to wear glasses and through higher prevalence of dry eye are less suitable to traditional contact lenses; these are the perfect patients to be considering OK as a vision correction solution and coincidently also in the power range that we have shown hyperopic OK is capable of reliably achieving.
I believe we'll need to do a lot more for our young progressing myopes and our Gen X presbyopes, who will both demand best practice clinical care and the vision correction products to match.
Hyperopic presbyopes can still be treated with LASIK providing the degree of hyperopia is low enough to accommodate the extra treatment required for a laser blended vision treatment (mini-monovision).