Abstract

Light from a set of target rings is directed onto a living cornea at near-normal incidence, The reflected real image of the target is photographed simultaneously with a profile of the cornea projected onto a scale that indicates the radius of a reference sphere. The difference of position between any target point on the photograph and the corresponding point on a photograph taken with a spherical reflector in the apparatus is used to calculate the departure of the cornea from the reference sphere. Errors of positioning of the cornea with respect to the apparatus are compensated by calculating the asphericity of the cornea for a reference sphere that most closely matches the corneal surface for the central 3-mm-diam zone. In tests, the standard deviation of calculated asphericity at the edge of the 9-mm-diam region observed on known surfaces was 4.3 µm.

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  1. J. Stone, Brit. J. Physiol. Opt. 19, 205 (1962).
  2. H. von Helmholtz, Treatise on Physiological Optics, English translation by J. C. P. Southall (Opt. Soc. Am., Rochester, N. Y., 1924; Dover, New York, 1962), Vol. 1, pp. 10–14.
  3. A. Gullstrand, Kgl. Svenska Vetenskaps Akad. Handl. 28, 12 (1896), English translation by W. Ludlam, Am. J. Optom. Arch. Am. Acad. Optom. 43, 249 (1966).
  4. L. Evershed-Martin, Brit. J. Physiol. Opt. 16, 24 (1959).
  5. R. Bonnet and P. Cochet, Am. J. Optom. Arch. Am. Acad. Optom. 39, 227 (1962).
  6. A. G. Bennett, Brit. J. Physiol. Opt. 21, 234 (1964).
  7. M. Uhlig, Ophthalmologica 153, 43 (1967).
  8. S. Wittenberg and W. M. Ludlam, J. Opt. Soc. Am. 56, 1612 (1966).
  9. B. A. J. Clark, Master's thesis, University of Melbourne, 1966.
  10. J. H. Prince and W. H. Havener, Am. J. Ophthalmol. 43, 461 (1957).
  11. B. A. J. Clark and L. G. Carney, Am. J. Optom. Arch. Am. Acad. Optom. 48, 333 (1971).
  12. A. Gullstrand in Appendix II of Ref. 2, p. 314.
  13. B. A. J. Clark, Appl. Opt. 7, 1403 (1968).
  14. L. G. Carney, Master's thesis, University of Melbourne, 1970.
  15. B. A. J. Clark, PhD thesis, University of Melbourne, 1971.

Bennett, A. G.

A. G. Bennett, Brit. J. Physiol. Opt. 21, 234 (1964).

Bonnet, R.

R. Bonnet and P. Cochet, Am. J. Optom. Arch. Am. Acad. Optom. 39, 227 (1962).

Carney, L. G.

L. G. Carney, Master's thesis, University of Melbourne, 1970.

B. A. J. Clark and L. G. Carney, Am. J. Optom. Arch. Am. Acad. Optom. 48, 333 (1971).

Clark, B. A. J.

B. A. J. Clark and L. G. Carney, Am. J. Optom. Arch. Am. Acad. Optom. 48, 333 (1971).

B. A. J. Clark, PhD thesis, University of Melbourne, 1971.

B. A. J. Clark, Appl. Opt. 7, 1403 (1968).

B. A. J. Clark, Master's thesis, University of Melbourne, 1966.

Cochet, P.

R. Bonnet and P. Cochet, Am. J. Optom. Arch. Am. Acad. Optom. 39, 227 (1962).

Evershed-Martin, L.

L. Evershed-Martin, Brit. J. Physiol. Opt. 16, 24 (1959).

Gullstrand, A.

A. Gullstrand in Appendix II of Ref. 2, p. 314.

A. Gullstrand, Kgl. Svenska Vetenskaps Akad. Handl. 28, 12 (1896), English translation by W. Ludlam, Am. J. Optom. Arch. Am. Acad. Optom. 43, 249 (1966).

Havener, W. H.

J. H. Prince and W. H. Havener, Am. J. Ophthalmol. 43, 461 (1957).

Ludlam, W. M.

S. Wittenberg and W. M. Ludlam, J. Opt. Soc. Am. 56, 1612 (1966).

Prince, J. H.

J. H. Prince and W. H. Havener, Am. J. Ophthalmol. 43, 461 (1957).

Stone, J.

J. Stone, Brit. J. Physiol. Opt. 19, 205 (1962).

Uhlig, M.

M. Uhlig, Ophthalmologica 153, 43 (1967).

von Helmholtz, H.

H. von Helmholtz, Treatise on Physiological Optics, English translation by J. C. P. Southall (Opt. Soc. Am., Rochester, N. Y., 1924; Dover, New York, 1962), Vol. 1, pp. 10–14.

Wittenberg, S.

S. Wittenberg and W. M. Ludlam, J. Opt. Soc. Am. 56, 1612 (1966).

Other

J. Stone, Brit. J. Physiol. Opt. 19, 205 (1962).

H. von Helmholtz, Treatise on Physiological Optics, English translation by J. C. P. Southall (Opt. Soc. Am., Rochester, N. Y., 1924; Dover, New York, 1962), Vol. 1, pp. 10–14.

A. Gullstrand, Kgl. Svenska Vetenskaps Akad. Handl. 28, 12 (1896), English translation by W. Ludlam, Am. J. Optom. Arch. Am. Acad. Optom. 43, 249 (1966).

L. Evershed-Martin, Brit. J. Physiol. Opt. 16, 24 (1959).

R. Bonnet and P. Cochet, Am. J. Optom. Arch. Am. Acad. Optom. 39, 227 (1962).

A. G. Bennett, Brit. J. Physiol. Opt. 21, 234 (1964).

M. Uhlig, Ophthalmologica 153, 43 (1967).

S. Wittenberg and W. M. Ludlam, J. Opt. Soc. Am. 56, 1612 (1966).

B. A. J. Clark, Master's thesis, University of Melbourne, 1966.

J. H. Prince and W. H. Havener, Am. J. Ophthalmol. 43, 461 (1957).

B. A. J. Clark and L. G. Carney, Am. J. Optom. Arch. Am. Acad. Optom. 48, 333 (1971).

A. Gullstrand in Appendix II of Ref. 2, p. 314.

B. A. J. Clark, Appl. Opt. 7, 1403 (1968).

L. G. Carney, Master's thesis, University of Melbourne, 1970.

B. A. J. Clark, PhD thesis, University of Melbourne, 1971.

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