Assessment of contrast sensitivity in pre & post trans-epithelial photorefractive keratectomy

Purpose: study was to compare the contrast sensitivity before and after Trans- PRK. Methods: The comparative study was conducted in department of ophthalmology medina teaching hospital Faisalabad. Total 30 myopic volunteers of both genders, with ages ranging from 20 years to 35 years, who had not undergone any ocular surgery or medical treatment for systemic or ocular diseases e.g. diabetes, Alzheimer's disease, glaucoma, macular degeneration, dry eye and cataract. Data was collected through non-probability convenient sampling technique from Sep 2018- May 2019. Data was entered in to SPSS version 20 and analyzed by using Paired sample t-test. Results: Significant improvement was seen in contrast sensitivity after Trans-PRK 0.00 (p<0.005) by paired sample t-test. Contrast sensitivity test before and after Trans-PRK of right and left eye showed mean of right eye -.41533±0.18678 and left eye mean -.22167±0.24378 respectively. Conclusion: Our research concluded that, there is greater statistical difference between before and after Trans-PRK contrast sensitivity measurements. Contrast sensitivity improves after surgery significantly. Trans-PRK procedure is best method to correct refractive errors and removal of glasses and contact lens permanently with minimum chance of complications.