Abstract
The value of Haidinger's brushes for pleoptic treatment is widely proclaimed. Thus, there is reason to have this simple entoptic phenomenon available via the instruments used for this work. The clinical haploscopic instruments readily lend themselves to this purpose. Arruga and Downey (1960) 1 have reported such an attachment for the Clement-Clarke synoptophore, but the description given by them is not sufficient to allow one to duplicate it. Thus it is perhaps of interest to report a similar solution in some detail, which can be used with any clinical haploscope that is designed to take slides.* The particular haploscope which I have used is the American Optical Company's troposcope. The arrows in Fig 1 show two models of the attachment in place as they fit into the slide slots in each of the arms of the instrument. Fig 2 shows the device in detail. Fig 3 gives the machine drawings.
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