Comparison of Goldmann Tonometry and Dynamic Contour Tonometry in Normal and Descemet Stripping Endothelial Keratoplasty Eyes
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Published on: May 25, 2020
Dipanjan Pal1, Jayangshu Sengupta
1From the Priyamvada Birla Aravind Eye Hospital, Kolkata, India.
Purpose:
This study aimed to compare intraocular pressures (IOP) measured by dynamic contour tonometry (DCT) with Goldmann tonometry (GAT) in Descemet stripping endothelial keratoplasty (DSEK) eyes. The agreeability between the 2 established methods and their relation to central corneal thickness (CCT) was also studied.
Design:
A comparative case series.
Methods:
Forty-six eyes of DSEK were enrolled at least 3 months after the procedure. Thirty-five other eyes of the same patient cohort served as control. Intraocular pressures were measured by DCT and GAT by 2 different examiners in a randomized manner. Central corneal thickness was measured by ultrasonic pachymetry. Statistical analysis was used for the calculation of means, SD, coefficient of determination, linear regression, and Bland and Altman plot. Statistical significance was considered as P < 0.05.
Results:
Mean CCT was 624.49 μm and 518.41 μm in DSEK and control eyes, respectively. Mean IOP by GAT and DCT, respectively, was 19.4 and 21.5 mm Hg in DSEK eyes and 15.12 and 17.6 mm Hg in controls. Descemet stripping endothelial keratoplasty eyes showed universally higher IOP by either method in comparison with normal controls. Dynamic contour tonometry reading was significantly higher than GAT in both (P < 0.05) groups. The correlation between IOP and CCT was not significant in DSEK eyes (P > 0.05).
Conclusions:
A higher baseline IOP is to be expected in DSEK eyes, which is independent of corneal thickness. Both GAT and DCT can be used as a standard method to measure IOP in DSEK eyes, but their readings cannot be used interchangeably.
