Refractive errors include myopia, hyperopia, and astigmatism, eye conditions that are very common. Most
people have one or more of them. Refractive errors can
usually be corrected with eyeglasses or contact lens.
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|If you have myopia you can clearly see close objects, but
distant objects are blurry. Myopia is caused by the
eyeball being too long. Myopia occurs in different degrees
from minimal to extreme. The more myopic you are the
blurrier your vision is at a distance and objects will
have to be closer to you so you can see them clearly.
||If you have hyperopia, you can see distant objects
clearly, but close ones are blurry. Hyperopia occurs when
the eyeball is too short for the light rays to focus
clearly on the retina.
If you have an astigmatism, the surface of the eye
(cornea) is not perfectly round, rather it is more oval
and doesn’t allow the eye to focus clearly. The cornea
is very important in helping the eye focus light rays on
the retina. Astigmatism rarely occurs alone. It is
usually accompanies myopia or hyperopia.
If you have presbyopia, you have the loss of the ability
to focus up close that occurs as you age. Most people are
between 40 and 50 years when they realize for the first
time that they can’t read objects close to them. The
letters of the phonebook are “too small” or you have to
hold the newspaper farther away from your eye to see it
clearly. At the same time your ability to focus on objects
that are far way remains normal.