J Korean Ophthalmol Soc.  2022 May;63(5):426-433. 10.3341/jkos.2022.63.5.426.

Accuracy of Intraocular Pressure Measurements of Eyes with Therapeutic Contact Lenses after Vitrectomy

• Moon JY
• Kim YH
• Ji YS

• KMID: 2530256
• DOI: http://doi.org/10.3341/jkos.2022.63.5.426

Abstract

Purpose
To evaluate the accuracy of intraocular pressure (IOP) measurements obtained by a rebound and non-contact tonometer in eyes with a therapeutic contact lens (CL) after vitrectomy.
Methods
In 60 eyes of 60 patients who underwent vitrectomy for vitreoretinal disease, IOP was measured using a rebound tonometer (iCare ic200^®; IOP_RT) and non-contact computerized air puff tonometer (CT-80, IOP_NCT), before and after wearing a CL (Purevision2^®, +0.0 diopter). The mean IOP of three consecutive measurements were analyzed, and a comparative analysis with IOP measured by a Goldman applanation tonometer (IOP_GAT) was performed.
Results
The mean IOP_RT without and with the CL was 12.55 ± 5.43 and 13.12 ± 5.13 mmHg, respectively, showing a statistically significant difference (p = 0.02) and strong positive correlation (r = 0.90, p < 0.001). The mean IOP_NCT with and without the CL was 12.18 ± 3.24 and 12.17 ± 3.14 mmHg, showing no statistically significant difference (p = 0.17). The consistency with IOP_GAT (12.57 ± 5.22 mmHg) was highest in IOP_RT without the CL, followed by IOP_RT with the CL, IOP_NCT without the CL, and IOP_NCT with the CL (intraclass correlation coefficients = 0.955, 0.945, 0.856, and 0.850, respectively). In addition, the rebound tonometer successfully measured IOP, regardless of whether the CL was worn; however, the non-contact tonometer failed to measure IOP in seven eyes without the CL and nine with the CL. No difference was observed according to intraocular tamponade type.
Conclusions
A rebound tonometer can be used as an alternative IOL measuring method in eyes for which it is difficult to use a Goldman applanation tonometer due to the postoperative presence of a therapeutic CL.

Keyword

Intraocular pressure; Non-contact pneumotonometry; Rebound tonometry; Therapeutic contact lens; Vitrectomy