Most ophthalmologists agree that the best apparatus to use in the early stages of fusion training for persons with concomitant squint is the Worth-Black amblyoscope or the synoptophore, which is in principle an amblyoscope. The synoptophore has only two advantages over the original amblyoscope: (1) It is mounted and (2) the corneal reflex is more visible with this instrument than with the amblyoscope. The first advantage is important, but the second is of little practical importance. The disadvantage of the synoptophore lies in the high cost of both the apparatus and the slides. Many ophthalmologists feel that they cannot afford to purchase high-priced apparatus for fusion training, especially if lower-priced apparatus will give as good results. In such cases and also for use in the home, the Worth amblyoscope is the only alternative. Bearing that in mind, I have devised a mounting and card ejectors for the original Worth-Black
Hunt GA. MOUNTING FOR THE WORTH-BLACK AMBLYOSCOPE. Arch Ophthalmol. 1936;15(5):898–899. doi:10.1001/archopht.1936.00840170110010
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