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10 cards from this deck
See nearby objects clearly, not distant objects
Diverging (concave) lens with negative power
See distant objects clearly, not nearby objects
Converging (convex) lens with positive power
power=1f\text{power} = \frac{1}{f}power=f1
Dioptres (D), equivalent to m−1\text{m}^{-1}m−1
Cornea not spherical; different curvatures in directions
Cylindrical lens
Spherical: point; Cylindrical: line
Angle (1-180°) for cylindrical lens orientation
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