Effect of Quantum of Energy used During Nd:YAG Laser Posterior Capsulotomy on Magnitude of IOP Rise
Abstract
Objective: To find out whether there exists a correlation between the quantum of energy used and the amount of rise of intra ocular pressure (IOP) following Nd:YAG laser capsulotomy. Materials and methods: The subjects were enrolled after taking a written informed consent. A total of 110 patients undergoing Nd:YAG laser posterior capsulotomy for management of posterior capsule opacification with a minimum of 3 months following cataract surgery. After detailed history and ocular examination ,Nd:YAG laser capsulotomy was performed. Pre-laser IOP was noted. Nd:YAG laser posterior capsulotomy was performed. Laser energy used was noted following which post-laser IOP was recorded after 1, 2 and 4 hours post-procedure. Paired t-test was used for comparison of means of IOP and energy levels. ROC analysis was used to predict the cutoff value of energy on the basis of change of IOP from baseline. Results: Mean energy used in Nd:YAG Laser posterior capsulotomy procedure for all patients was 58.57±34.63 mJ. Mean IOP at 1st hour follow-up was 15.32±2.91 mmHg, at 2nd hour follow-up was 16.24±3.23 mmHg and at 4th hour follow-up was 16.18±3.35 mmHg. At all three follow-ups, mean change in IOP was found to be statistically significant (p<0.001). Conclusion: Post laser IOP rise is minimal and transient; it varies with the amount of energy used. Delhi J Ophthalmol 2020;31;56-61; Doi http://dx.doi.org/10.7869/djo.592
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