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Astigmatism
impaired vision caused by irregularities in the curvature of the cornea or the lens
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Blind spot
The area on the retina that marks the site of intrance of the optic nerve.
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Blindness
No perception of visual stimuli; lack or loss of ability to see.
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Legal blindness
Less then 20/200 vision with corrective eyeglasses.
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Braille
A system of writing and printing by means of raised points representing letters; enables people with a visual disability to read by touch.
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Cataract
Clouding or opacity of the lens of an eye
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Color blindness
Inability to distinguish between certian colors; most common in red/green confusion; color vision is a function of the cones of the retina.
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Diplopia
Double vision; perception of two images of a single object
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Glaucoma
Group of diseases of the eye characterized by intraocular pressure from pathologic changes in the optic disc; person have visual-field defects
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farsightedness; eyeball is shorter behind the retina; vision is better for distant objects than for near objects
hyperopia
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nearsightedness; longer eyeball from front to back so the image is focused in front of the retina
myopia
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night blindness; may be hereditary or related to vitamin deficiency
nyctalopia
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pertaining to the eye
ocular
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physician who specializes in diagnosing and prescribing tx for defects, injuries, and diseases of the eye (obsolete term: oculist)
opthamologist
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the branch of medicine that deals with the anatomy, diagnosis, pathology, and tx of the eye
opthamology
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tech who prepares and adapts lenses; fills Rx from an opthamologist
optician
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a specialist in optometry, the measurement of visual acuity and adaptation of lenses for correction of visual defects
optometrist
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inflammation of the retina
retinitis
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noninflammatory disease of the retina; identified by the chronic disease of which it is a symptom; for example, diabetic retinopathy reflects the retinal manifestations of diabetes mellitus, including microaneurysms
retniopathy
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