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The original form of the binocular magnifier was that of two partial lenses cemented together at an angle. Its proportions were not what have since proved to be the best, but they were sufficiently good to make it a very practical working instrument, as soon as it had been learned how to use it. But the writer's first attempt to employ it, persisted in until it caused severe eyeache and headache, resulted in complete failure; so that the lens was thrown aside for weeks before the second attempt was made. The same difficulty has been experienced by others.
The use of such lenses seems easiest to young persons who have worked little with optical instruments, and are accustomed only to normal binocular vision. In proportion as one has learned to use monocular optical instruments, like the microscope and ophthalmoscope, and especially the ordinary magnifier or corneal loupe, is the difficulty
JACKSON E. EXAMINATION OF THE EYE BY OBLIQUE ILLUMINATION, WITH THE BINOCULAR MAGNIFIER. JAMA. 1898;XXX(5):245–247. doi:10.1001/jama.1898.72440570013001g
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