Laser Assisted In Situ Keratomileusis (Lasik) Versus Trans Epithelial Photorefractive Keratectomy (T-Prk) In Astigmatic Patients

Doi: 10.36351/pjo.v38i1.1250

Abstract

Purpose:  To compare the results of LASIK versus Trans Epithelial Photorefractive Keratectomy (T-PRK) in correcting astigmatic refractive error.

Study Design:  Quasi experimental study.

Place and Duration of Study:  Lahore Medicare Hospital from January to October 2018.

Methods:  One hundred and twenty six eyes of 63 patients, age 18 to 35 years, either gender, presenting with astigmatism were enrolled in this study. Myopes with spherical equivalent (SE) ? -13.0 diopter sphere (DS), hyperopes with SE ? +5.0 DS and astigmatism ? 1.5 D with visual acuity better or equal to 0.3 LogMAR were included. Astigmatic eyes with < 1.5D and with any other ocular pathology were excluded. Refractive status was assessed by Canon Autorefractor and Heine Retinoscope. Average reading of both methods was taken. Patients were divided into two groups (31: LASIK; 32: trans-PRK) by spin of a coin method. Refractive surgery was done in both groups. Data was analyzed by SPSS 20. Normality of quantitative data was checked by Shapiro Wilk test. Mann Whitney-U test was used for non-parametric data. P-value ? 0.05 was taken as significant.

Results:  Mean age of the patients was 25.83 ± 3.09 years. The difference in residual sphere, amount of cylinder, axis of cylinder and CCT (central corneal thickness) after surgery in two groups was insignificant. P values were as follows; for sphere p = 0.85, amount of cylinder p = 0.22, axis of cylinder P = 0.46 and CCT p = 0.07.

Conclusion:  Both techniques are equally good in correcting astigmatism (p = 0.22). LASIK or T?PRK can be done alternatively in patients with astigmatism.

Key Words:  LASIK, Trans epithelial PRK, Astigmatism.