Comparison of intraocular pressure measurements between icare tonometer and transpalpebral tonometer “EasyTon” in patients with and without glaucoma

The iCare is portable rebound tonometer that doesn’t require anesthesia and may prove most useful for measuring IOP in adults who are uncooperative with Goldmann applanation tonometry.The EasyTon is portable transpalpebral tonometerthat provides quick and hygienic intraocular pressure measurement by vibration through the eyelid to calculate the most accurate IOP.It improves safety of IOP measurement by eliminating contact of the cornea with air stream or diagnostic tools.The aim of our study was to assess the accuracy of transpalpebral tonometer EasyTon IOP measurements by comparing them against Icare tonometer in patients with and without glaucoma. 33 patient’s(66 eyes) IOP were examined using Icare and EasyTon tonometers.The mean age was 72,79years.Patients were divided in 2 groups – with glaucoma(10/33) and without glaucoma(24/33).Icare tonometry was performed first, followed by EasyTon tonometery. Normal IOP was considered 10-21mmHg.Data was analysed using Microsoft Exel and IMB SPSS.26.0(Pearson’s correlation coefficient). Mean IOP for iCare tonometer in the right eye was 12.97mmHg(SD+/- 2.81)but in the left eye–13.78mmHg(SD+/-2.96).Mean IOP for EasyTon tonometer in the right eye was 12.81mmHg (SD+/-2.61)but in the left eye 13.75mmHg(SD+/-2.25).The mean difference between Icare and EasyTon IOP’s in the right eye was 0.151mmHg(SD+/-1.74)but in the left eye–0.069mmHg(SD+/-1.99). The Pearson's correlation coefficient r between Icare and EasyTon IOP’s in the right eye was 0.797(p<0.001)but in the left eye 0.640(p<0.001).There was no statistically significant difference found between IOP measured by Icare un EasyTon in the rigth eye(p= 0.467)and in the left eye(p= 0.897)for glaucoma patients. Compared with Icare tonometry,the EasyTon tonometer allows clinicians to estimate IOP with a portable and noninvasive method with similar reliability to that offered by Icare tonometer. It can also be used when Icare tonometer is contraindicated for patients.Both tonometers can be used in patients with glaucoma because there were no statistically significant difference found between IOP’s.