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The shape of your eye determines how well your vision can focus. Light rays enter the eye through the clear cornea, then through the pupil and the lens. In a normal eye the light rays are focused onto the retina, a light-sensitive tissue lining the back of the eye. Signals from the retina are sent through the optic nerve to the brain, where they are interpreted as the images we see. |
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Myopia is when people see near objects more clearly, but distant objects are blurry. It occurs when light rays entering the eye are focused in front of the retina instead of directly on it. Myopia is usually a result of the curvature (power) of the cornea being too strong or the length of the eyeball being too long. Myopia is often inherited; it usually starts in childhood and typically stabilizes in the late teens or early adulthood. Patients should realise that even correcting myopia with LASIK procedure will not eliminate the potential need for reading glasses when reaching middle age. |
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Astigmatism is the result of having a corneal surface that is not regular in shape. The eye is unable to focus clearly at any distance because of this irregular focusing surface. Individuals with no astigmatism have corneas that are shaped like basketballs while individuals with astigmatism have corneas that are shaped more like footballs. |
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Irregular curvature of lens or cornea |
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