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THE SLOT hand perimeter, a new modification of the standard hand perimeter, is designed for a simpler, more rapid, and more certain localization of the retinal tear, or hole, or any other retinal lesion.
The retinal area is viewed by direct ophthalmoscopy, through the slot in the arm, as the patient fixes on the center of the hand perimeter. The meridian into which the arm is turned and the degrees from the fixation point are noted. The angle, in degrees on the arc of the perimeter, is then translated into distance, measured in millimeters from the limbus on the outer surface of the sclera with the aid of Stine's tables.
The advantages of the slot are obvious in that it greatly simplifies the localizing procedure, since no additional help is required and there is constant direct visualization through the slot. This avoids guesswork and awkwardness.
The small hand perimeter, of
LEVITT H. THE SLOT HAND PERIMETER. AMA Arch Ophthalmol. 1953;50(3):352-353. doi:10.1001/archopht.1953.00920030359015