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THIS NEW instrument was exhibited during the 1953 Session of the American Academy of Ophthalmology and Otolaryngology. The instrument was developed through the mutual efforts of one of us (E. B. S.) as a physician and the other (W. G. C.) as a patient.
The instrument was worked out to obtain more complete accuracy in central field examination. At the same time, the determination can be done in much less time than is usually required for this examination with similar tangent screens.
The instrument is 24 by 24 in. (60 by 60 cm.) with a fixed central fixation point. A magnet moves the test object freely upon the visible field. At the conclusion of testing for each radius the test object is withdrawn from view behind a concealment shield. At the rear, or operating, side there is a sheet of nonmagnetic metal with a circular opening which serves as a
CONOVER WG, SPAETH EB. CONOVER-SPAETH MAGNETIC CAMPIMETER. AMA Arch Ophthalmol. 1954;52(1):125-126. doi:10.1001/archopht.1954.00920050127015