Title: Analysis of Higher-Order Wavefront Aberrations in Standard PRK
Abstract: Purpose: To investigate the preoperative characteristics and postoperative change of the higher-order wavefront aberrations (HOAs) in myopic photorefractive keratectomy (PRK). Methods: Standard PRK was performed in 39 eyes (spherical equivalent -4.711.56D) using the VISX? STAR S4TM excimer laser system. Wavefront analysis was performed preoperatively and 6 months postoperatively using the VISX? WaveScanTM aberrometer. Statistical analysis was performed to assess the preoperative characteristics of the HOAs and the PRK-induced aberrations. Results: The preoperative root mean square (RMS) value of the total HOAs was 0.291 : coma 0.159 , trefoil 0.157 , spherical aberration 0.093 . Among the 3 HOAs, only the spherical aberration showed moderate magnitude negative correlation with the spherical equivalent (p=0.012) and sphere (p=0.005). The magnitude of all of the HOAs, except trefoil, were significantly increased at postoperative 6 months: total HOAs 183% (0.533 , p, p, p, p=0.681). In the postoperative correlation analysis, only the PRK-induced spherical aberration showed the increase of magnitude with increasing preoperative spherical equivalent (p=0.036) and sphere (p=0.019). Conclusions: The HOAs, especially spherical aberration and coma, were increased after PRK. Among the 3 HOAs, the spherical aberration showed the greatest increase of magnitude and percent change; it also showed a positive correlation with increasing preoperative spherical equivalent and sphere. Further software improvements in the wavefront-guided surface ablations need to have a diminution of PRK-induced spherical aberration.
Publication Year: 2005
Publication Date: 2005-01-01
Language: en
Type: article
Access and Citation
Cited By Count: 4
AI Researcher Chatbot
Get quick answers to your questions about the article from our AI researcher chatbot