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 ?
Presbyopes have had to choose between vision performance and convenience, but that is no longer the case.
This contraindication does not apply to presbyopes undertaking RLE
Astigmats and Presbyopes to Drive Demand for Contact Lenses III-4
Two powerhouse industry and consumer brands are now working together to provide presbyopes with a new choice.
I would recommend giving the early presbyopes a free pair of their usual lenses in the presbyopic design for them to try instead, or the nearest material you can get.
Emerging or early presbyopes may begin to notice challenges with a multitude of near-point tasks such as looking at a menu, deciphering text from a cell phone or other handheld electronic device, or reading the GPS or satellite radio devices in their cars," explains Susan Resnick, O.
Continua(TM) D28 bifocal lenses offer presbyopes a terrific value," continues Vierzba.
He proposed some simple strategies to ensure net growth in contact lens wearers in practice by targeting key patient groups, namely children and presbyopes.
Unilens, known as the "Eye Care Professional's Specialty Contact Lens Company" continues its tradition of providing outstanding specialty lens solutions exclusively to licensed optical professionals by offering the new C-VUE 1 Day ASV (Aspheric Single Vision) lens as a daily disposable that is ideal for low level astigmats, early presbyopes, and those who simply wish to improve their vision.
In the past, presbyopes relied on vanity-crushing bifocals or reading glasses, but Dr.
Dailies AquaComfort Plus Multifocal contact lenses are designed for presbyopes having trouble reading up close, or switching focus between near, intermediate and far distances.
McDonald said wavefront-optimized lens technology represents the state of the art in spectacle lens correction for presbyopes.