Abstract

A photokeratoscope is described which makes it possible to record in a single photographic exposure the contour of the entire corneal surface of the eye. This has been accomplished by using a hemispherical object surface located such that its center of curvature coincides with the center of curvature of the cornea being photographed. The reflection of this surface is photographed through a small hole in the object surface. A brief history of the development of photokeratoscopy is presented. Photographs taken thus far verify the spherical nature of the central zone of the cornea.

© 1957 Optical Society of America

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References

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  1. C. L. Weeks, unpublished manuscript read before the Western Ophthalmological Society at Los Angeles, January, 1940.
  2. A. Gullstrand in Physiological Optics by H. von Helmholtz (English translation), Vol. 1, 311 (1924).
  3. M. Amsler, Ophthalmologica 96, 77 (1938).
    [CrossRef]
  4. E. B. Streiff, Ophthalmologica 96, 84 (1938).
    [CrossRef]
  5. H. M. Dekking, Klin. Monatsbl. Augenheilk. 82, 640 (1929).
  6. F. Berg, Acta Ophthalmol. 7, 386 (1929).
    [CrossRef]
  7. W. Kokott, Klin. Monatsbl. Augenheilk. 100, 191 (1938).

1938 (3)

M. Amsler, Ophthalmologica 96, 77 (1938).
[CrossRef]

E. B. Streiff, Ophthalmologica 96, 84 (1938).
[CrossRef]

W. Kokott, Klin. Monatsbl. Augenheilk. 100, 191 (1938).

1929 (2)

H. M. Dekking, Klin. Monatsbl. Augenheilk. 82, 640 (1929).

F. Berg, Acta Ophthalmol. 7, 386 (1929).
[CrossRef]

Amsler, M.

M. Amsler, Ophthalmologica 96, 77 (1938).
[CrossRef]

Berg, F.

F. Berg, Acta Ophthalmol. 7, 386 (1929).
[CrossRef]

Dekking, H. M.

H. M. Dekking, Klin. Monatsbl. Augenheilk. 82, 640 (1929).

Gullstrand, A.

A. Gullstrand in Physiological Optics by H. von Helmholtz (English translation), Vol. 1, 311 (1924).

Kokott, W.

W. Kokott, Klin. Monatsbl. Augenheilk. 100, 191 (1938).

Streiff, E. B.

E. B. Streiff, Ophthalmologica 96, 84 (1938).
[CrossRef]

von Helmholtz, H.

A. Gullstrand in Physiological Optics by H. von Helmholtz (English translation), Vol. 1, 311 (1924).

Weeks, C. L.

C. L. Weeks, unpublished manuscript read before the Western Ophthalmological Society at Los Angeles, January, 1940.

Acta Ophthalmol. (1)

F. Berg, Acta Ophthalmol. 7, 386 (1929).
[CrossRef]

Klin. Monatsbl. Augenheilk. (2)

W. Kokott, Klin. Monatsbl. Augenheilk. 100, 191 (1938).

H. M. Dekking, Klin. Monatsbl. Augenheilk. 82, 640 (1929).

Ophthalmologica (2)

M. Amsler, Ophthalmologica 96, 77 (1938).
[CrossRef]

E. B. Streiff, Ophthalmologica 96, 84 (1938).
[CrossRef]

Other (2)

C. L. Weeks, unpublished manuscript read before the Western Ophthalmological Society at Los Angeles, January, 1940.

A. Gullstrand in Physiological Optics by H. von Helmholtz (English translation), Vol. 1, 311 (1924).

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Figures (3)

Fig. 1
Fig. 1

Side view of the photokeratoscope. At the left may be seen the chin and forehead rest used to locate the subjects head.

Fig. 2
Fig. 2

Photokeratoscopic pictures of normal and distorted corneas. (A) Normal corneas. (B) Advanced Keratoconus. (C) Early Keratoconus.

Fig. 3
Fig. 3

Photokeratoscopic pictures of precision chrome steel balls five-eights and three-fourths inches in diameter.