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In order to see a clear image, the eye must focus rays of light on to the light-sensing part of the eye - the retina, which is located in the back of the eye.This focusing - called refraction - is performed mainly by the cornea and the lens, which are located at the front of the eye, the anterior segment.
Wills Eye Hospital is a non-profit eye clinic and hospital in Philadelphia, Pennsylvania. It was established in 1832 and is the oldest continually operating eye-care facility in the United States. It is the ophthalmology residency program for Thomas Jefferson University . Since 1990, Wills Eye Hospital has consistently been ranked one of the ...
Ophthalmology ( / ˌɒfθælˈmɒlədʒi /, OFF-thal-MOL-ə-jee) [1] is a clinical and surgical specialty within medicine that deals with the diagnosis and treatment of eye disorders. [2] A former term is oculism . An ophthalmologist is a physician who undergoes subspecialty training in medical and surgical eye care. [3]
Contact lenses. to correct refractive errors of the eye; a little invasive. Phoropter. used in refraction testing. Tonometers. used to determine the intraoccular pressure (IOP) - useful in glaucoma; video link for various types of tonometers. Speculum: to keep the eyes open during any operation. Universal eye speculum.
Non-contact tonometer ND: Neutral density filter NLP: No light perception No light perception is considered total visual impairment, or total blindness; see Visual impairment#Classification: NPC: Near point of convergence or no previous correction NRC Normal retinal correspondence NV Near vision NWT Normal wearing time o symptoms Zero symptoms ϕ
Glaucoma is a group of eye diseases that lead to damage of the optic nerve, which transmits visual information from the eye to the brain. Glaucoma may cause vision loss if left untreated. It has been called the "silent thief of sight" because the loss of vision usually occurs slowly over a long period of time. [5]
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