title: [The American Optical non-contact tonometer and its results compared with the Goldmann applanation tonometer (author's transl)].
abstract: Intraocular pressure (IOP) of 617 eyes was measured with both an AO non-contact tonometer (NCT) and a Goldmann applanation tonometer (GAT). - Statistical evaluation and the scattergram gave the following results: Correlation coefficient r = 0.74. Regression line y = 3.01 + 0.8x. Close agreement between mean GAT (17.8 mmHg) and mean NCT (17.3 mmHg). Variations in readings for NCT-GAT in 92% of all cases with a range of +/- 8 mmHg (95% reliability range) - in some cases much higher or lower - for all IOP values between 10 and 30 mmHg. - Ten NCT measurements were carried out on 42 eyes. The mean values lay between 9 and 22 mmHg, with deviations of up to +/- 6 mmHg from the GAT values. The range was 3 to 13 mmHg, averaging 7.1 mmHg. Standard deviations observed from these measurements were 1.03 minimum, 2.29 average and 3.99 maximum. These were not correlated to IOP. - Changes in the place of applanation are discussed as a possible cause of the variability of NCT readings.
mesh_terms: D006801:Humans; D007429:Intraocular Pressure; D014065:Tonometry, Ocular / Q000295:instrumentation* / Q000379:methods
vernacular_title: Das American Optical non-contact tonometer und seine Ergebnisse im Vergleich zur Goldmannschen Applanationstonometrie.