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 ?
Usually, patients grow older with you, so most of the optometrists are presbyopic themselves and have some 'skin in the game,' explained Dr Moody.
Marcella McParland, J&J's director of professional affairs for the UK and Ireland, explained that '1-Day Acuvue Moist Multifocal' is specifically designed for the natural shape and function of the presbyopic eye, to help practitioners continue to provide patients with "an excellent vision experience.
All statements in this press release that are not statements of historical fact are forward-looking statements, including statements about any of the following: financial items; the plans, strategies, and objectives of management for future operations or prospects for achieving such plans; statements regarding potential new or improved products (including a presbyopic lens); and any statements of assumptions underlying any of the foregoing.
The pharma company's eye care division, Alcon, announced in July, last year, that it will license the smart lens technology "for all ocular medical use" The two potential uses highlighted by Novartis are measuring the blood glucose of diabetic patients and auto-focusing lenses for correcting the vision of presbyopic patients (Google had no further update for OT on the development).
AT LISA tri supports ophthalmologists and ophthalmic surgeons in meeting the demands of cataract and presbyopic patients who lead an active life and expect surgery to provide them with a quality of vision which is similar to what they were used to before the aging process of their eyes started.
focuses on the research and commercialization of custom optical solutions dedicated to presbyopic vision correction.
MOIST Brand MULTIFOCAL was developed based on years of insights of the presbyopic eye.
According to the authors, surgeons should consider various factors when choosing between RLE and a phakic IOL including age, axial length, type and magnitude of refractive error, anterior segment configuration, endothelial cell count, and the patient's desire for presbyopic correction.
The relationship will allow for our new C-Vue Advanced HydraVUE™ family of custom silicone hydrogel lenses to be aggressively marketed throughout the United Kingdom and Europe, offering eye-care professionals advanced custom contact lens technology to serve the ever expanding global specialty and presbyopic marketplace.
We are excited to bring the KAMRA inlay to surgeons in Canada so they can offer a sound solution to their presbyopic patients," said Ed Peterson, AcuFocus President and Chief Executive Officer.
More than 110 million people in the US are presbyopic, and this population will continue to grow
For hyperopes, the distance vision generally improves over the following month, but near vision worsens slightly if they are presbyopic, and a reading correction is required.