Trans Palpebral Intraocular Pressure (Tpiop) Measurement By Diaton Compared To Goldman Applanation Tonometer (Gat) In Myopic Eyes Before And After Transepithelial Photorefractive Keratectomy (Tprk) In Saudi Arabia.

To compare intra ocular pressure (IOP) measured via the trans palpebral (tpIOP) method using a Diaton with a Goldman applanation tonometer (GAT) and study the determinants of IOP difference in the eyes undergoing transepithelial photorefractive keratectomy(TPRK) for myopia.

This cross-sectional validation study was held in 2020 in an eye hospital in Saudi Arabia

This cross-sectional validation study was held in 2020 in an eye hospital in Saudi Arabia. IOP was measured by Diaton and GAT before treatment, after one week, and one month of TPRK. Matched pair analysis was done to study the efficiency of Diaton compared to GAT. The IOP difference was correlated to spherical equivalent (SE), central corneal thickness (CCT), age, gender, and tpIOP. Spearman correlation was performed to study the determinants.

We studied 200 myopic eyes of 100 patients. The mean difference of IOP by two methods before, 1 week after, and 1 month after TPRK were 0.790, -0.790, and -0.920 mmHg, respectively (P < 0.001). Diaton could measure IOP effectively 89.5% eyes before TPRK and 82% and 84% at one week and one month after TPTK, respectively. At week 1, IOP differences were significantly correlated to baseline CCT (P = 0.02) and tpIOP at week 1 (P < 0.001). One month after TPRK, only tpIOP was significantly correlated to the difference in IOP (P < 0.001).

Diaton is a good screening tool before TPRK. It helps in monitoring IOP after surgery. Although more practical, it is less efficient than GAT. Myopia grade and tpIOP help caregivers become more vigilant when monitoring IOP post-TPRK.