Intra Ocular Pressure Change After Low Energy And High Energy Nd:Yag Laer Posterior Capsulotomy

Abstract

OBJECTIVE

To determine the frequency of change in Intraocular Pressure (IOP) among patients undergoing YAG Laser Posterior Capsulotomy and to compare IOP change based on the level of YAG laser energy and number of shots applied.

METHODOLOGY

A descriptive cross-sectional study was conducted at the Department of Ophthalmology, Fauji Foundation Hospital Rawalpindi, from December 2021 to November 2022. A total of 200 pseudophakic eyes with posterior capsular opacification were included in the study. Preliminary baseline intra-ocular pressure (IOP) was measured by Goldman Applanation Tonometry (GAT). Patients were divided into groups according to the laser energy utilized and the number of shots. IOP was measured after 1 and 4 hours post-procedure and results compared.

RESULTS

In the low energy group (mean energy 2.73 mJ), average IOP calculated was 14.86 and 12.97 mmHg after 1 and 4 hours of procedure respectively. While in the high energy group (mean energy 4.11mJ), it was 19.42 and 17.51 mmHg respectively. In group 1 (less than 20 shots), mean IOP 1 and 4 hours procedure was 13.88 and 12.97 mmHg respectively. In group 2 (greater than 20 shots) the mean IOP was 21.63 and 18.31 mmHg respectively. The rise in IOP was significantly higher for the higher laser energy and in the group with greater number of shots at both 1 and 4 hours (p=0.000).

CONCLUSION

In conclusion, we found that significant rise of IOP is noted when more energy and greater number of shots are utilized in YAG laser capsulotomy.