Ophthalmologists who are interested in encouraging scientific perimetry have felt that moving objects by means of wires or cards not only is time-consuming, but also is sure to distract the patient's attention, particularly when the objects are worn. It is not always possible to make the theoretically approved technic practical for clinical studies, but an electric spot-light object has been devised which approaches the ideal. This has been in use in various forms for the last three years, and though no claim for originality is being made, the combination suggested seems not to have been used in the way described. To all intents and purposes a small slit-lamp has been constructed which projects a disklike spot of light on the arc. The size of the object can be varied by turning a small wheel, and its intensity and color can be modified by appropriate filters. The projection device is
Evans JN. PERIMETER SPOT-LIGHT OBJECT. Arch Ophthalmol. 1932;7(4):614–619. doi:10.1001/archopht.1932.00820110128011
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