The ocular hypertension indicator (tonometer) is a screening instrument and not a diagnostic instrument. We believe that this instrument, placed in the hands of general practitioners according to some acceptable plan, may prevent blindness through the earlier discovery of hypertension and earlier reference of the patient to an ophthalmologist. In our opinion the screening instrument need only indicate whether the intraocular pressure is below or above normal. This restriction eliminates the delicate parts of the diagnostic tonometer.
Description of Instrument.—
The hypertension indicator uses the footplate and plunger details of the well known Schiötz tonometer. The weights of these parts correspond to the Schiötz tonometer. At this point the similarity ends. In place of the lever, pointer and scale of the Schiötz, a two part, direct reading indicator is used. The reference part is screwed on the top of the footplate tube, and the indicator is screwed on the
BERENS C, TOLMAN CP. AN OCULAR HYPERTENSION INDICATOR (TONOMETER). JAMA. 1950;142(17):1360. doi:10.1001/jama.1950.72910350004010