A new applanation tonometer has been described. This instrument is an integral part of the slit lamp and uses conventional applanation techniques. A comparison clinically with the Goldmann tonometer indicates that there is little difference in performance of the two instruments.
Campbell CJ, Rittler MC, Dianetti JC, Bartfay SA. Clinical Evaluation of the AO Applanation Tonometer. Arch Ophthalmol. 1967;77(5):646-650. doi:10.1001/archopht.1967.00980020648015