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After a review of the literature on transillumination of the eye, a study of the lids by the same method of lighting was undertaken to determine what information could be derived from such an examination.
Several instruments were tried and found to be more or less successful in showing up some of the structures of the lids by transillumination. Among these were the Lange transilluminator, the bulb of the electric ophthalmoscope, both with and without the condensing lens, the whole illuminating system of the May ophthalmoscope detached from the head and, finally, an especially designed prism transilluminator modeled after the lighting system of the ophthalmoscope.The last-mentioned instrument is the one with which most of the observations were made. It consists of a stem with a threaded end, which fits on the handle of some ophthalmoscopes (Welch Allyn, National and perhaps others) and which takes in its other end
WOOD EH. CLINICAL STUDY OF TRANSILLUMINATION OF THE EYELIDS. Arch Ophthalmol. 1939;22(4):608–612. doi:10.1001/archopht.1939.00860100092008
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