The rapidly growing popularity of the shadow test as an accurate method of obtaining the exact refraction of an eye under the influence of a mydriatic, prompts the writer to present an inexpensive eye for the use of the student or oculist who may desire to learn skiascopy at his leisure.
The eye as here shown, reduced one-third in size, is made of two cylinders of cardboard, one slightly smaller than its fellow, to permit slipping evenly into the other. Both cylinders are well blackened inside. The smaller cylinder is closed at one end, and on its inner surface is placed a colored lithograph of the normal eye ground. The larger cylinder is also closed at one end, except for a central round opening, ten millimeters in diameter, which is occupied by a + 20 diopter lens; and on its outer surface is a colored lithograph of the normal eye with
THORINGTON J. A SKIASCOPIC EYE. JAMA. 1895;XXIV(1):13. doi:10.1001/jama.1895.02430010013001d
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