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Abnormal curvature of the eyeball so that rays of light are not focused on a single point on the retina.
Having two sides that are rounded, elevated, and curved evenly like part of a sphere. The lens of the eye is biconvex.
Prolapse of the upper eyelid caused by abnormalities of the eyelid muscle or by nerve damage.
Structure on each side of the lens that connects the choroid and iris; contains muscles that control the shape of the lens.
Fibrous transparent layer of clear tissue that extends over the anterior portion of the eyeball.
Process of recording (viewing and photographing) the circulation of a fluorescein dye through the blood vessels of the retina.
Fluid accumulation in the anterior and posterior chambers of the eye causing increased pressure and damage to the retina.
Yellowish region on the retina lateral to and slightly below the optic disc; contains the fovea centralis, the area of clearest and central vision.
Deterioration of the macula of the retina and producing a loss of central vision.
Cranial nerve that carries impulses from the rod and cone cells of the retina to the cerebral cortex in the occipital lobe of the brain.
Non-medical professional trained to examine and measure the eye to prescribe and fit eyeglasses and contact lenses.
Bending of light rays by the cornea, lens, and fluids of the eye to bring light rays into focus on the retina.
Inflammation of the retina with pigmentation and progressive scarring of tissue.
Photoreceptor retinal cell; essential for seeing objects in low light and for peripheral vision.
Procedure to suture a band of silicone on the sclera directly over a detached portion of the retina.
Relay center in the brain through which optic nerve fibers pass on their way to the cerebral cortex.
Inflammation of the uvea, which is the vascular layer of the eye (including the iris, choroids, and ciliary body).
Visual acuity test
Measurement of clearness of vision; assessed by reading letters of decreasing size on an eye chart.
Visual field test
Measurement of the area in front of the eye in any part of which an object is seen without moving the eye.
Snail-shaped, spirally wound tube in the inner ear; contains hearing-sensitive receptor cells.
Measurement of the temperature of the tympanic membrane by detection of infrared radiation from the eardrum.
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