In recent years, surveys have indicated that approximately 2% of persons over 40 years of age have undiagnosed glaucoma.1-3 In order to detect chronic simple glaucoma in its early symptomless stage, it seems desirable that in patients over 40 tensions should be taken routinely during general physical examinations. With this in mind, the Berens-Tolman Ocular Hypertension Indicator was introduced4 to the medical profession in 1950 and was later modified somewhat as described in a statistical report of its use by Cholst and Horotivtz.5 In the latter paper, the Berens-Tolman and Schiøt instruments were compared on 180 glaucoma patients (numbber of eyes not stated), with use of a 5.5 gm. weight on the Schiøtz tonometer and the 1948 Schiøtz calibration scale. Of 57 eyes with tensions elevated to between 30 and 60 mm. Hg, 54 (95%) registered "high" on the OHI and 3 (5%) registered "normal" (false negatives
JOHNSTONE WW. Clinical Comparison of the Berens-Tolman Ocular Hypertension Indicator with the SchiÖtz Tonometer. AMA Arch Ophthalmol. 1959;62(1):75–77. doi:10.1001/archopht.1959.04220010079008
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