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aqueous humor
a clear watery fluid that fills the anterior and posterior chambers of the anterior cavity of the eye.
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astigmatism
an unevenness in the corneal or lenticular curvature, causing horizontal and vertical rays to be focused at two different points on the retina, which results in visual distortion.
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conjunctiva
the mucous membrane lining the inner surfaces of the eyelids and anterior part of the sclera.
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hyperopia
farsightedness, or an inability of the eye to focus on nearby objects.
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lens
biconvex, avascular, transparent structure located behind the iris.
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myopia
nearsightedness, or an inability of the eye to focus on objects far away.
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nystagmus
an abnormal involuntary repetitive movement of the eyes.
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presbyopia
a hyperopic shift to farsightedness resulting from a loss of elasticity of the lens of the eye; the condition commonly develops with advancing age, with the first symptoms appearing about age 40 years.
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refraction
the ability of the eye to bend light rays so that they fall on the retina.
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retina
a layered nervous tissue membrane of the eye, continuous with the optic nerve, that receives images of external objects and transmits visual impulses through the optic nerve to the brain.
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sclera
an opaque structure composed of collagen fibers meshed together that encircles the globe of the eye; commonly referred to as the "white" of the eye.
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tinnitus
a subjective noise sensation, often described as ringing, heard in one or both ears.
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vertigo
a sensation that a person or objects around the person are moving or spinning; usually stimulated by movement of the head.
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