A brief history of the evolution of tonometers and comparison of goldmann applanation tonometer versus non–contact tonometer and their correlation to central corneal thickness

: This study was designed to evaluate and compare differences between Goldmann applanation tonometer’s (GAT) values non-contact (NCT) In various central corneal thickness(CCT). prospective of 100 eyes 50 subjects done for the age group 25 yrs – 75 yrs, who did not have any glaucomatous changes in optic disc. Intraocular pressure readings were taken by GAT NCT measured within a fixed time range 10:00 AM 1:00 PM minimize effect diurnal variation. CCT NIDEK 530P while performed Appasamy ref AATM-K001 after 20 minutes recorded from both subjects. Then correlated with intraocular values, which obtained NCT. The data subjects, whom 24 females 26 males. mean 51.22 ± 2.7 years, value 530.6 5.7 µ. IOP respectively 15.41 0.6 mmHg, 15.11 0.5 (Table 1). shows significantly strong positive correlation (r= 0.73, P< .0001), 0.55, .0001) 2, 5 6). Pearson coefficient also (r = 0.76, .00001)(Table 3). findings our correlate earlier research. It demonstrates that, application appropriate correction factors CCT, can be considered good screening tool measuring pressure.