how many types of defects in vision you know in human beings? enlist them all with its cause and method of its rectification?
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Explanation: Myopia is also called nearsightedness. It affects about one third of people. People with myopia can see nearby objects clearly, but distant objects appear blurry.
In myopia, the eye is too long. Below, you can see how images are focused on the retina of someone with myopia (Figure below). Myopia is corrected with a concave lens, which curves inward like the inside of a bowl. The lens changes the focus, so images fall on the retina as they should.
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