In order to evaluate the Halberg and Schiøtz tonometers for use by medical students, five students used both tonometers. After each student completed measuring the intraocular pressure of 20 patients, he was asked to evaluate both tonometers subjectively. Objectively, the students were more accurate with the Schiøtz as compared to the Halberg, and subjectively, all students preferred the Schiøtz to the Halberg. The students unanimously agreed that further training in tonometry was desirable in medical school, and that tonometry is a procedure that all physicians should be familiar with, employ frequently, and be able to perform with confidence.
Kaiden JS, Zimmerman TJ, Worthen DM. Hand-Held TonometersAn Evaluation by Medical Students. Arch Ophthalmol. 1973;89(2):110-112. doi:10.1001/archopht.1973.01000040112009