Change in Biometric Parameters after Deep Vitrectomy with Silicon Oil Tamponade

Abstract

Purpose: To determine change in biometric parameters after PPV with silicon oil tamponade. Study Design: Quasi experimental study. Place and Duration of Study: Shahid Sadoughi University of Medical Sciences, Yazd, Iran, from 2021 to 2023. Method: This study included 50 patients of 50 to 85 years with vitreous hemorrhage and proliferative diabetic retinopathy who were referred to Yazd hospital for PPV. The study evaluated all patients before and three months after PPV with Silicon oil (SO) injection in terms of anterior segment biometric parameters including lens thickness (LT), axial length AL, central corneal thickness (CCT), anterior chamber depth (ACD) and mean of keratometry. The IBM SPSS version 16.0 processor software was used to analyze the data. The Kolmogorov-Smirnov test was employed to evaluate the normality of the data distribution. The paired t-test was performed to evaluate the mean differences between datasets. The P-value of less than 0.05 was considered statistically significant. Results: The study consisted of 50 participants, of which 28% (n = 14) were females. Mean age was 65.92 ± 9.58 years. Vitreous hemorrhage was present in 34% (n = 17) participants and proliferative diabetic retinopathy was seen in 66% (n = 33). Mean of each parameter was as follows after surgery: AL: 23.88 ± 1.48, LT: 4.32 ± 0.39, CCT: 527.63 ± 39.38, ACD: 3.17 ± 0.59, and keratometry: 44.0 ± 1.32. Conclusion: SO increased the axial length of the eye and caused a myopic shift in patients who underwent vitrectomy surgery with SO tamponade.