Physics — The Eye & Lens Power
Lens power in dioptres and correction of vision defects.
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P = \frac{1}{f}\ (\text{dioptres})
\text{myopia: diverging (concave) lens}
\text{hyperopia: converging (convex) lens}
\frac{1}{v} - \frac{1}{u} = \frac{1}{f}