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Myopia is also known as shortsightedness means person can see near things clear but cant focus on far objects well.Hence concave lens are used to correct this defect of vision .In this the image is not focussed on retina but it is formed in front of it.

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Nearsightedness, or myopia, is the most common refractive error of the eye, and it has become more prevalent in recent years.In fact, a recent study by the National Eye Institute (NEI) shows the prevalence of myopia grew from 25 percent of the U.S. population (ages 12 to 54) in 1971-1972 to a whopping 41.6 percent in 1999-2004.Though the exact cause for this increase in nearsightedness among Americans is unknown, many eye doctors feel it has something to do with eye fatigue from computer use and other extended near vision tasks, coupled with a genetic predisposition for myopia.
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When used colloquially, 'myopia' can also refer to a view on or way of thinking about something which is—by extension of the medical definition—hyper-focused and fails to include a larger context beyond the focus.
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