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The effect of a spherical lens upon a pencil of light-rays entering it obliquely has been carefully studied by Prof. E. C. Pickering and Dr. Charles H. Williams, who have recorded the results of their investigations in the Proceedings of the American Academy of Arts and Sciences, Vol. 10, 1874-5, p. 300. Dr. G. Hay, in a paper "On the Increase of Refractive Power of a Plano-Cylindrical Lens when Rotated about its Axis," in the Transactions of the American Ophthalmological Society for 1875, p. 319, has given the results of a similar study with reference to cylindrical lenses.
In these papers the mathematical questions arising in connection with this subject are clearly and exhaustively discussed. But the only practical applications made of the law developed, is, in the former paper, a reference to its importance in the correcting of wide-angle photographic lenses, and in the latter, the suggestion of an
JACKSON E. EFFECTS OF OBLIQUITY OF THE CORRECTING LENS TO THE VISUAL AXIS. Read in the Section on Ophthalmology, Otology and Laryngology, at the Thirty-Eighth Annual Meeting of the American Medical Association, June, 1887. JAMA. 1887;IX(21):645–647. doi:10.1001/jama.1887.02400200005001b
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