state the types of lens used in the spectacles
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state the types of lens used in the spectacles
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It can be convex or concave based on the power whether it is positive or negative....
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It is not mentioned. It varies and depends upon the type of eye problem one has. But, in generally, covex lens are used more, it is thicker in the middle and acts as a magnifying glass.
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REGARDS, ARNAB ✌️
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