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. 2009 Feb 24;2(1):29-32.
doi: 10.1007/s12177-009-9016-8.

Intraocular pressure profile during the modified diurnal tension curve using Goldman applanation tonometry and dynamic contour tonometry

Carlos Gustavo Vasconcelos de Moraes, Alexandre Soares Castro Reis, Milena Eimi Sano, Alan Kardec Barreira, Roberto Murad Vessani, Remo Jr Susanna

Intraocular pressure profile during the modified diurnal tension curve using Goldman applanation tonometry and dynamic contour tonometry

Carlos Gustavo Vasconcelos de Moraes et al. J Ocul Biol Dis Infor. .

Abstract

The aim of this study was to compare the intraocular pressure (IOP) profile during the modified diurnal tension curve (mDTC) using Goldman applanation tonometry (GAT) and dynamic contour tonometry (DCT) in treated glaucomatous eyes. Eligible subjects were submitted to the mDTC using GAT and DCT in this sequence. IOP measurements were performed at 8 a.m., 10 a.m., 2 p.m., and 4 p.m.. Central corneal thickness was measured using ultrasound pachymetry in the morning. Statistical analysis was performed using paired Student's t test and Bland-Altman plot. The mean difference between DCT and GAT measurements was 0.9 mmHg. The mean +/- SD IOP measurements during the mDTC were 19.68 +/- 4.68, 17.63 +/- 4.44, 17.25 +/- 5.41, and 17.32 +/- 4.25 mmHg using GAT and 19.97 +/- 4.75, 18.79 +/- 4.61, 19.53 +/- 5.30, and 19.43 +/- 5.45 mmHg using DCT. IOP measurements were higher in the morning (8 a.m.) and decreased throughout the day using both tonometers. The difference between IOP measurements using GAT and DCT was smaller in the morning and increased throughout the day. The IOP variability using GAT was higher than using DCT. Corneal biomechanical properties might help explain our findings.

Keywords: Corneal biomechanics; Dynamic contour tonometry; Glaucoma; Intraocular pressure; Tension curves.

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Figures

Fig. 1
Fig. 1
Agreement between intraocular pressure (IOP) values using Goldman applanation tonometry (GAT) and dynamic contour tonometry (DCT). The 95% confidence interval of the mean ranged between −0.3 and 2.1 mmHg
Fig. 2
Fig. 2
Frequency distribution of differences between dynamic contour tonometry (DCT) and Goldman applanation tonometry (GAT) during the day
Fig. 3
Fig. 3
Mean intraocular pressure (IOP) profile during the modified diurnal tension curve (mDTC) using Goldman applanation tonometry (GAT) and dynamic contour tonometry (DCT). *Paired samples Student’s t test showed signifficant difference between morning (8 a.m.) and afternoon (2 and 4 p.m.) IOP measurements using GAT and DCT (p < 0.001). *Paired samples Student’s t test did not show significant differences between GAT and DCT IOP measurements at 8 a.m. (p = 0.54). At 10 a.m., the difference was significant (p < 0.001) and remained throughout the day
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