Original Article

Variability of dynamic contour tonometer measurements and its relation to ocular biometric factors

  • Ümit Aykan
  • Mesut Erdurmuş
  • Burhan Yilmaz
  • Ali Aydın

Received Date: 11.06.2009 Accepted Date: 03.09.2009 Turk J Ophthalmol 2009;39(6):425-429


To investigate the intraobserver variability of dynamic contour tonometer (DCT) measurements and to evaluate the correlation between the readings and ocular biometric factors.


Consecutive 3 measurements of DCT were performed to 78 healthy male subjects. Central corneal thickness (CCT), axial length (AL) and anterior chamber depth (ACD) values were measured for evaluation of possible correlations.


A total of 155 eyes of 78 cases with a mean age of 20,8 ± 1,6 (20-27) years were included into the study. Mean CCT was 549,7 ± 36,1 μm, mean AL was 23,7 ± 0,8 mm and mean ACD was 3,6 ± 0,3 mm. Intraobserver correlation coefficients (%95 confidence interval) were 0,70 (0,63–0,76) for intraocular pressure (IOP) and 0,78 (0,72–0,83) for ocular pulse amplitude (OPA). Mild to moderate positive correlation was detected between the IOP and CCT (r:0,34 p


The agreement of the intraobserver variability of IOP and OPA measurements by DCT were found high. DCT readings were affected by CCT.

Keywords: Dynamic contour tonometer, intraobserver variability, ocular biometric factors, ocular pulse amplitude

Full Text (Turkish)