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Article
May 4, 1895

ERRORS OF REFRACTION.

JAMA. 1895;XXIV(18):665. doi:10.1001/jama.1895.02430180011002d

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Abstract

These eighteen propositions will assist the beginner to more readily understand the many pages treating of the same subjects in all our text-books.

With a second lecture on the lenses which correct the errors of refraction, and a third lecture on the frames which hold the lenses which correct the errors of refraction, we will have completed the "House that Jack Built."

  1. Three essentials to sight—Lighty; eye; brain.

  2. Three characteristics of light; it proceeds—From every point; in every direction; along straight lines called Rays.

  3. Three directions to rays of light—Parallel; divergent; convergent.

  4. Three destinies for light—Absorbed; reflected; refracted.

  5. Three varieties of forms of glass reflect light— Plane; prism; curved surfaces.

  6. Three combinations of curved surfaces converge rays of light—Convex spherical; convex cylindrical; convex sphero-cylindrical.

  7. Three combinations of curved surfaces diverge rays of light—Concave spherical; concave cylindrical; concave sphero cylindrical.

  8. Three refracting surfaces in the eye—Anterior surface of cornea; anterior surface

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