What is astigmatism? Why do I get tired eyes? How to relieve tired eyes?

What is astigmatism?
Astigmatism is a very common refractive (focussing) error of the eyes which can
cause blurred vision. It occurs as a result of irregular curvature on the surface of the
cornea (corneal astigmatism) or in the lens of the eye itself (lenticular astigmatism).
Astigmatism may cause blurring of both distant and near objects. You can be born
with astigmatism or it may develop as you age. Astigmatism can also occur in
combination with either near‐sightedness (myopia) or far‐sightedness (hyperopia).
Astigmatism may be experienced as uneven blurring because the irregular curvature
can make some parts of what you view more out of focus than other parts. By using
the diagrams below, you can create an effect like that of astigmatism. If you are
viewing the diagrams on a computer screen move your head to the side and look at
the screen at an angle (about 30°) notice the horizontal lines are more distinct or if
you print the diagrams to paper and when you tilt the top of the printed page away
from you. Lines running across the page will appear less distinct than lines running
up and down.
The blur resulting from uncorrected astigmatism can make things (such as print)
uncomfortable to look at, difficult to focus on, and may cause headaches, tiredness
and poor concentration. Your optometrist can prescribe glasses or contact lenses to
correct your astigmatism and provide you with clear, comfortable vision.
Why do I get tired eyes?
If you have tired eyes you may have uncorrected astigmatism. Astigmatism can
cause fatigue if you are concentrating on a visual task (reading, computer use,
driving, etc.) for a long period of time. Your focussing system is constantly adjusting,
trying to achieve a sharp image which the astigmatic eye cannot produce without
optical correction. Fatigue or frontal headaches may occur if you ‘squint’ your eyes
to see more clearly, causing the muscles of the eyelids and face to become
uncomfortable

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