In using the binocular magnifier it is essential that the two lenses shall be kept the same height before the two eyes. Unless this is done binocular vision becomes impossible because of the vertical prismatic effect. To insure the keeping of the lenses in proper position the gutta-percha headband has been adopted to support the instrument. When this is obtained of the proper size softened by heat and molded to the head of the operator who is to use it, an ideal means of support has been secured.
To enable the operator to illuminate the field of operation and still keep both hands free for the operation, I have added a mirror to the instrument. This is illustrated in the accompanying cut.
The condensing mirror of proper size and curvature gives as good lighting as the condensing lens ordinarily used for purposes of focal illumination. With it the source of
JACKSON E. BINOCULAR MAGNIFIER FOE USE IN OPERATING. JAMA. 1902;XXXIX(21):1323. doi:10.1001/jama.1902.52480470033002g
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