To determine:
The way in which corneas should be reshaped by laser surgery to correct nearsightedness and farsightedness respectively.
Introduction:
An individual can see objects because the light from that object falls on the fovea of the retina. The focusing of light begins at the cornea and ends at the lens. When focusing on nearby objects, this lens becomes rounded; and to focus on distant objects, it becomes flattened.
If an individual cannot see the nearby objects clearly, it means that their cornea is too rounded, due to which, light from nearby objects falls behind the retina. Individuals with this problem are farsighted.
If an individual cannot see the distant objects clearly, it means that their cornea is too flat, due to which, light from nearby objects falls in front of the retina. Individuals with this problem are nearsighted.
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