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Defects of the Eye

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dora ho

on 29 May 2011

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Transcript of Defects of the Eye

Eye defect Symptoms Inability to perceive differences between some of the colours that others can distinguish Causes It's caused by the absence or defect of one or more types of cone cells on the retina Treatments Colour blindness is hereditary,and it is more commonly found in males than females.Although colour blindness cannot be corrected,it does not cause too much trouble to our daily life Video Colour-blindness Long sight Symptoms cannot see a near objects clearly Causes eyeball being too short lens being too thin hereditary Treatments wearing glasses with convex lenses laser eye surgery Video Short sight Symptoms cannot see a distant objects clearly Causes hereditary eyeball being too long the lens being too thick Treatments wearing glasses,contact lenses with concave lenses laser eye surgery Video Cataract Symptoms
Blurry vision
Sunlight seem to be too bright or cause glare.
Bright colors may appear dulled.
Double vision
Frequently changing contact or eyeglasses prescriptions. Causes
A cataract scatters the light as it passes through the lens, preventing a sharply defined image from reaching your retina.
Aging Treatments
extra-capsular: removing the lens but leaving the majority of the lens capsule intact, then replaced with a plastic lens.
intra-capsular: removing the entire lens of the eye, including the lens capsule, then replaced with a plastic lens. Viedo Astigmatism Causes
Due to an irregular or toric curvature of the cornea or lens Treatments
Can be corrected by a toric lens Symptoms
blurry vision, squinting, asphenopia, fapigue, or headaches. Viedo
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