Measuring the Shape of Soft Corneal Lenses
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The radius of curvature of a hard corneal lens in air is usually measured by the method proposed by DRYSDALE . An autostigmatic microscope is used, the counterpart, for near images, of the autocollimating telescope. This is focused in turn on the surface and on its centre of curvature and the distance between these two positions is the radius. If the projected graticule consists of radial lines, different orientations can be focused separately to measure the two principal radii of a toric surface.
KeywordsBeam Splitter Numerical Aperture Light Trap Radial Line Toric Surface
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