How can you identify the type of vision defect a person is suffering from by physically touching their spectacles?
(N/A) By touching the lenses of the spectacles,one can determine their shape.
$1$. If the lens is thinner in the middle and thicker at the edges,it is a concave lens,which is used to correct myopia (nearsightedness).
$2$. If the lens is thicker in the middle and thinner at the edges,it is a convex lens,which is used to correct hypermetropia (farsightedness).
$1$. If the lens is thinner in the middle and thicker at the edges,it is a concave lens,which is used to correct myopia (nearsightedness).
$2$. If the lens is thicker in the middle and thinner at the edges,it is a convex lens,which is used to correct hypermetropia (farsightedness).
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