Applanation tonometry in the conscious cynomolgus monkey (Macaca fascicularis).

Four monkeys (Macaca fascicularis) were trained to tolerate applanation tonometry while fully conscious. The tonometer used was the Draeger tonometer with an applanation area of 3.06 diameter, but with a reduced application surface (4 mm instead of 6.8 mm diameter). The reduction did not change the calibration and is applicable in this monkey species without any correction factor. The mean intraocular pressure determined was 19.12 mmHg.