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Influence of Corvis ® ST on intra ocular pressure (IOP) measurements

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First Author: D.Borroni ITALY

Co Author(s):    C. Bonzano   K. Gadhvi   R. Hristova   P. Wolfrum   C. Rocha de Lossada   V. Romano     

Abstract Details

Purpose:

Corvis ST Tonometry (CST) produces a biomechanically corrected intraocular pressure (bIOP), which is comparable to the Goldmann applanation tonometer (GAT), using a high-speed camera and air-puff to applanate the cornea. Subsequent IOP measurements immediately following GAT are known to be lower, likely due to the effect of applanating the cornea. The effect on subsequent IOP measurement following of CST pneumatic applanation of the cornea is not fully known. We purposed to investigate the effect of CST on subsequent intraocular pressure (IOP) measurement using the iCare Rebound Tonometer (ICRT) which does not applanate the cornea.

Setting:

Royal Liverpool University Hospital

Methods:

We conducted a prospective randomised study between April and September 2019. Participants had an ICRT measurement at baseline, followed by a CST measurement in one randomly selected eye. Their other eye was used as the control. ICRT measurements were then repeated at 10 seconds, 1, 2, 4, 8, 15, 30- and 60-minutes. Results were compared using paired samples t-tests and repeated-measures analysis of variance (ANOVA).

Results:

40 participants (80 eyes) including 20 healthy and 20 with primary open angle glaucoma. Baseline characteristics, as well as ICRT and CST measurements were comparable at baseline. IOP was significantly lower at each time point in glaucomatous eyes (p=0.000-0.009) and in healthy eyes (p=0.000-0.005) following CST.

Conclusions:

CST results in a reduction of IOP in both glaucomatous and healthy eyes for a minimum of 60 minutes.

Financial Disclosure:

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