Name the three common defect of vision . What are the causes Name the type of lens used to correct each of them
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mayopia, hypermetropia, presbyopia
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2
myopia it is for short sight
the lens used is concave
hypermetropia it is for long sight
the lens used is convex
pressbiopia
the lens used is bi focal lens
the lens used is concave
hypermetropia it is for long sight
the lens used is convex
pressbiopia
the lens used is bi focal lens
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