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 ?
And with the number of presbyopic Americans estimated to be growing by 10% to 15% a year, nonprescription reading glasses offer an inexpensive solution to the problem, those in the industry say.
Presbyopic dental hygienists may compensate for their decreased visual acuity by increasing working distance, which inadvertently compromises their ability to see fine details.
4 As far as clear lens exchange is concerned, it can be offered to presbyopic patients but is not appropriate for younger patients due to their intact accommodation reflex.
Tender notice number : Presbyopic glasess/4/16-17/98 dated 13.
Dr Hayashida will now lead and oversee the company's strategic initiative in building exceptional clinical validation and clinical utility for its continuum of lenses for the myopic, presbyopic and cataract vision care markets.
The presbyopic patients were well explained about the correction, only for distant vision and the need to use the presbyopic glasses thereafter.
Pending FDA approval, the company said it intends to make the Presbia Flexivue Microlens commercially available to US presbyopic patients to improve their near vision and to reduce their dependency on reading glasses, concluded its CEO and president Todd Cooper.
Consequently, it results in an alarming rate of citizens becoming presbyopic at a younger age, before 40.
Later models have overhead switches which are a challenge for the presbyopic set and concern us from a crashworthiness standpoint.
Kristian Hohla, CEO of Technolas Perfect Vision, said, "There's a real, growing need to cater to patient demand for effective presbyopic solutions which provide improved quality of life and convenience.
IOL technology has advanced to the point that not only does surgery correct the cataract problem, but it also can improve problems with distance vision and, with premium presbyopic lenses, near vision for reading.
The articles, which are illustrated by color clinical photographs and imagery, include such topics as surgical planning with corneal topography, wavefront technology, LASIK technique with MK and Intralase and prevention of LASIK complications, phototherapeutic keratectomy, excimer laser correction and hyperopia, irregular astigmatism, presbyopic correction, phakic intraocular lens implantation, cataract surgery under local anesthesia, the difficult iris, phacofluidics and bimanual phacoemulsification and avoiding corneal burns, challenging cases in cataract extraction, limbal stem cell implantation, amniotic membrane transplantation, suturing corneal incisions and lacerations, managing posterior vitreous pressure, and performing glue applications.