J Korean Ophthalmol Soc.  2019 Dec;60(12):1250-1256. 10.3341/jkos.2019.60.12.1250.

Comparison of Intraocular Pressures Measured by the Corvis ST and Other Tonometers in Normal Eyes

• Lee SH
• Moon JI
• Jung YH

• KMID: 2466178
• DOI: http://doi.org/10.3341/jkos.2019.60.12.1250

Abstract

PURPOSE
We compared the intraocular pressures (IOPs) measured by the Corvis ST (CST), Goldmann applanation tonometer (GAT), and Rebound tonometer (RBT) and correlated the measured IOPs with the corneal center thickness (CCT).
METHODS
The IOPs were measured in 34 eyes of 34 normal subjects using the CST, GAT, and RBT by independent examiners. Comparisons between the IOPs measured by the CST and other tonometers were made using paired t-tests and Bland-Altman plots and Pearson's correlation coefficient was used to correlate the measured IOPs with the CCTs.
RESULTS
The IOP measured by the CST (C-IOP; 14.57 ± 2.37 mmHg) was significantly higher than that measured by the GAT(13.56 ± 2.25 mmHg) and RBT (13.57 ± 3.26 mmHg) (p < 0.05). The biomechanically corrected C-IOP (C-bIOP; 13.40 ± 2.06mmHg) showed no difference from the GAT-IOP and RBT-IOP (p > 0.50). In analyzing the correlation with CCT, RBT-IOP (R =0.34; p = 0.705) showed a lower correlation than the GAT-IOP (R = 0.49; p < 0.01) and C-IOP (R = 0.48; p < 0.01). The C-bIOP showed no correlation with the CCT (p = 0.74).
CONCLUSIONS
The IOP measurements using the C-IOP were significantly higher than the RBT-IOP and GAT-IOP but the C-bIOP showed no difference from the RBT-IOP and GAT-IOP. C-IOP, RBT-IOP, and GAT-IOP were significantly correlated with corneal thickness, but there was no correlation between CCT and C-bIOP. C-bIOP may therefore be considered clinically useful.

Keyword

Biomechanical corrected intraocular pressure; Central corneal thickness; Corvis ST

MeSH Terms

Intraocular Pressure*

Figure

• 

  Figure 1 Comparisions between IOPs measured by different tonometers. (A) C-IOP vs. GAT, (B) C-IOP vs. RBT, (C) C-bIOP vs.GAT, (D) C-bIOP vs. RBT, (E) RBT vs. GAT. Bland-Altman plots between different tonomters. The solid line indicates mean differenceof both tonometers. The dotted lines are 95% of limits of agreement. C-IOP = intraocular pressure measured with CorvisST tonometer; GAT = Goldmann applanation tonometer; RBT = rebound tonometer; C-bIOP = biomechanically corrected C-IOP.

• 

  Figure 2 Correlation between CCT vs. RBT, GAT, C-IOP, and C-bIOP. (A) CCT vs. C-IOP, (B) CCT vs. GAT, (C) CCT vs.RBT, and (D) CCT vs. C-bIOP. Moderated positive linear correlation were noted between CCT and C-IOP (R = 0.482, p < 0.01),CCT and GAT (R = 0.488, p < 0.01), CCT and RBT (R = 0.340, p = 0.705). The correlation between CCT and C-bIOP was notsignificant (p = 0.774). CCT = central corneal thickness; C-IOP = intraocular pressure measured with Corvis ST; GAT =Goldmann applanation tonometer; RBT = rebound tonometer; C-bIOP = biomechanically corrected C-IOP.

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