Clinical observation of transepithelial photorefractive ketatectomy on the anterior corneal surface parameters

Abstract

AIM: To observe the effect of transepithelial photorefractive ketatectomy(TPRK)on corneal curvature, asphericity and aberrations. METHODS: Twenty-nine patients(58 eyes)were enrolled. The 1mm-8mm zone curvature, target curvature and 3mm ring curvature, corneal asphericity(Q value)and corneal aberration was measured and analyzed before and 6mo after TPRK surgery. RESULTS: In the 1mm-8mm zone, the corneal curvature all had significant decrease after TPRK surgery. The curvature 3mm ring after operation was 39.20±1.99D, and the curvature target was 39.51±1.99D. And both values had a significant correlation(r=0.98). The Q values before and after operation were -0.44 to -0.30, 0.34-0.66 respectively (PP>0.05).CONCLUSION: After TPRK operation, corneal curvature decreased significantly, and the change in zone of 3mm was the largest. The Q value, total high-order aberration, spherical aberration and vertical coma increased significantly after TPRK operation.

Keywords

• transepithelial photorefractive keratectomy
• corneal curvature
• q value
• aberration