Abstract
The radius of curvature of a hard corneal lens in air is usually measured by the method proposed by DRYSDALE [1]. 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.
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References
C. V. Drysdale, Trans.Opt.Soc.London 2, 1 (1900).
W. H. Steel, and D. B. Noak, Appl.Opt. 16, 778 (1977).
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© 1982 Springer-Verlag Berlin Heidelberg
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Steel, W.H., Freund, C.H. (1982). Measuring the Shape of Soft Corneal Lenses. In: von Bally, G., Greguss, P. (eds) Optics in Biomedical Sciences. Springer Series in Optical Sciences, vol 31. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-39455-6_42
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DOI: https://doi.org/10.1007/978-3-540-39455-6_42
Publisher Name: Springer, Berlin, Heidelberg
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