What are the defects of eyes?
Others answers (1)
- eAnswers...May 11, 2014
There are many defects of eyes, some few defects are
discussed here : -
>> Myopia : - In this defect a person can see near objects
clearly, but the far objects appear blurred to him. The
image is made infront of the retina instead of image made on
retina. It happens because of long eyeball. The far images
can be made seen by wearing glasses with concave lenses. It
is also called nearsightedness.
>> Hypermetropia : - In this a person can see far objects
easily, but can't see near objects clearly. in this the
image is formed behind the retina. It happens because of
short eyeball. Hypermetropia can be corrected by wearing
glasses of convex lenses. It is also called farsightedness.
>> Astigmatism : - In this light rays don't come to a point
of retina, some rays falls behind the retina and some falls
infront of the retina. It is because of non-uniform
curvature of the cornea. In this if a person see a pattern
of lines placed at different angles then lines going in one
direction will appear sharp and the lines in other direction
will appear blurred. It can be corrected by using glasses of
spherical cylindrical lens.
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