How can I improve my poor eyesight?
If you have 20/20 eye
sight, it does not guarantee you have a vision that is perfect. This is because
reading a chart containing letters and numerals in different light conditions
is just a specific task, whereas our eyes have to perform many different and
challenging tasks in our daily lives. There is a term called binocular vision
that refers to the fact of our eyes working as a team to make sure we see
clearly in all conditions.
Bad eyesight, or blurred vision, is most commonly caused by
a refractive error like nearsightedness (myopia), farsightedness
(hyperopia) or astigmatism. Refractive errors develop when the eye is
unable to focus light directly on the retina. This inability to focus stems
from imperfections in the eye’s length, corneal curvature and/or internal lens
curvature. The refractive error you experience depends on which anatomical flaw
your eyes have.
For example, eye length
is normally associated with farsightedness, corneal curvature is linked to
astigmatism and lens curvature can determine nearsightedness or farsightedness.
Amblyopia (lazy
eye) — caused by a lack of communication between the eyes and the
brain — is another condition that can cause poor eyesight. The brain is
supposed to receive visual signals from both eyes, but in young patients with
amblyopia, the brain ignores signals from one of the eyes. If caught early,
amblyopia can be treated very successfully, but if left untreated, it can cause
permanent vision loss. Presbyopia: Experiencing blurred vision after age
40 is often an indication of presbyopia, or age-related farsightedness. As
your eyes age, the lenses that used to focus on up-close images become stiff,
making it difficult to adapt and causing your near vision to blur.
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