What is astigmatism and how does it arise, how is it treated?
Astigmatism is usually congenital, meaning a person experiences this condition from birth. However, sometimes trauma, eye surgery, or other eye
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arise?
What is farsightedness and how does it arise?
Farsightedness, one of the eye defects such as nearsightedness and astigmatism, is the reflection of the refracted rays in the
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