Visual Disorders - Refractive Errors
is the medical term for nearsightedness and is a vision
condition in which close objects are seen clearly, but objects
farther away appear blurred. Nearsightedness occurs if the
eyeball is too long or the cornea, the clear front cover of the
eye, has too much curvature. As a result, the light entering the
eye isn’t focused correctly and distant objects look blurred.
Some of the signs and symptoms of myopia include Headaches,
Eyestrain, and Squinting.
the medical term for farsightedness and is a vision condition in
which distant objects are usually seen clearly, but close ones
do not come into proper focus. Farsightedness occurs if your
eyeball is too short or the cornea has too little curvature
causing light entering your eye to not focus correctly. Common
signs of farsightedness include difficulty in concentrating and
maintaining a focus on near objects, eye strain, fatigue
and/or headaches after close work, aching or burning eyes,
irritability or nervousness.
|Anatomy of the Eye
Presbyopia is a vision condition in which
the crystalline lens of your eye loses its flexibility, which
makes it difficult for you to focus on close objects. Presbyopia
may seem to occur suddenly, but the actual loss of flexibility
takes place over a number of years. Presbyopia usually becomes
unnoticeable in the early to mid-40s.
Presbyopia is a natural part of the aging process of the eye. It
is not a disease and it cannot be prevented. Some signs of
presbyopia include the tendency to hold reading materials at
arm's length, blurred vision at normal reading distance and eye
fatigue along with headaches when doing close work.
Astigmatism is a vision condition that causes
blurred vision due either to the irregular shape of the cornea
(the clear front cover of the eye) or sometimes the curvature of
the lens inside the eye. An irregular shaped cornea or lens
prevents light from focusing properly on the retina, the light
sensitive surface at the back of the eye. As a result, vision
becomes blurred at any distance. Instead of the cornea having a
symmetrically round shape (like a baseball), it is shaped more
like a football. Astigmatism is a very common vision
condition. Most people have some degree of astigmatism. Slight
amounts of astigmatism usually doesn't affect vision and doesn't
require treatment. However, larger amounts cause distorted or
blurred vision, eye discomfort and headaches. Astigmatism
frequently occurs with other vision conditions like
nearsightedness (myopia)/and farsightedness (hyperopia).
Together these vision conditions are referred to as refractive
errors because they affect how the eyes bend or "refract" light.
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