Diseases, Disorders and Diagnostic Terms

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1

Snellen Chart

Test of clearness or sharpness of vision

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myopia

nearsightedness, parallel rays entering the eye are focused in front of the retina

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hyperopia

farsightedness, or inability of the eyes to focus on nearby objects; rays of light entering the eye are brought to focus behind the retina

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astigmatism

uneven focusing of the image, resulting from distortion of the curvature of the lens or cornea.

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tonometry

measuring of intraocular pressure using a tonometer

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assessment of visual fields

determines the physical space visible to an individual in a fixed position

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slit lamp examination

examines the various layers of the eye with a bright light

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mydiatric

agent that dilates the pupil

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presbyopia

hyperopia and impairment of vision due to advancing in years or old age

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accommodation reflex

ability of the eye to adjust to variations in distance

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fluorescein angiography

procedure that uses a bright green fluorescent dye to examine movement of blood through blood vessels in the eye

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amblyopia

reduced vision in one eye, not correctable by wearing glasses but by wearing an eye patch, also called strabismus

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blepharitis

inflammation of the eyelid

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cataract

abnormal progressive condition of the lens, characterized by loss of transparency

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achromatic vision

the inability to see any color at all

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achromatopsia

profound inability to see color

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daltonism

a weakness in perceiving colors distinctly

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conjunctivitis

inflammation of the conjunctiva also called red eyes or pink eye

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glaucoma

an abnormal condition of increased pressure within the eye. Prolonged pressure can damage the retina and optic nerve

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hordeolum

sty or stye, resulting from an infected sebaceous gland of an eyelash

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macular degeneration

progressive deterioration of the retina associated with new vessel formation that can progress to blindness

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nyctalopia

poor vision at night or in dim light

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photophobia

excessive sensitivity of the eyes to light

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ptosis

drooping of the upper eyelids

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retinal detachment

separation of the retina from the choroid, usually resulting from a hole or tear in the retina

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retinopathy

any disease of the retina