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Cataracts may lead to index myopia. [78] Form deprivation myopia occurs when the eyesight is deprived by limited illumination and vision range, [79] or the eye is modified with artificial lenses [80] or deprived of clear form vision. [81] In lower vertebrates, this kind of myopia seems to be reversible within short periods of time.
Contact lenses cause corneal neovascularization because they restrict oxygen diffusion to the corneal epithelium. In the short term, the cornea responds to oxygen deprivation by increasing blood flow to the corneal limbus, the narrow circular border between the cornea and sclera. Over time, this chronic limbal hyperemia can progress to corneal ...
Commonest is an autosomal recessive form, which is present at birth, but nonprogressive. Nystagmus is seen in association with this form. Another is an autosomal dominant form that occurs within the first few years of life. This form is progressive, but nystagmus is not seen. Deafness and CHED are seen in Harboyan syndrome. The histologic ...
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Radial keratotomy (RK) is a refractive surgical procedure to correct myopia (nearsightedness). It was developed in 1974 by Svyatoslav Fyodorov , a Russian ophthalmologist . It has been largely supplanted by newer, more accurate operations, such as photorefractive keratectomy , LASIK , Epi-LASIK and the phakic intraocular lens .
Becoming a host city for the Super Bowl is a long and difficult process, one that starts years before the game actually takes place. When all is said and done, the decision behind the host city ...
The Trump administration has ended extended protections granted to thousands of Venezuelans in the United States and is in talks to repatriate them, U.S. Homeland Security Secretary Kristi Noem ...
A rare six-planet parade is predicted to align in our night sky on Jan. 21 that will not only form a fascinating display from our view on Earth but will dazzle the cosmos in a way that affects ...