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The screen test is being used oftener in examination of ocular motility than formerly. As a result, more apparatus is being devised for the technic. Some time ago I devised what I believe is the simplest, although perhaps not the most accurate, device to use in certain cases in which more elaborate apparatus cannot be used, especially in handling children and when one has no assistant or nurse to hold a target. The child now helps in the game to be played.
The apparatus consists of a metal wire fly swatter, with the swatter part sawed off; a National bulb holder and bulb attached to the end with adhesive tape, and cord running to the volt controller. This gives a handle 18 inches (45 cm.) long, with the bulb on the upper end.
With the patient seated in an ordinary arm chair, all the cardinal positions of gaze can be
McMACKIN JV. FIXATION LIGHT. Arch Ophthalmol. 1948;40(3):351-352. doi:10.1001/archopht.1948.00900030357015