Multiple Logistic Regression Analysis of Factors in Refractive Outcome of Photorefractive Keratectomy(PRK)

ABSTRACT

PURPOSE: The purpose of our study was to evaluate the preoperative factors associated with refractive outcome of photorefractive keratectomy. METHODS: 113 eyes of 84 patients were observed for 1 year after PRK. We examined the outcome of PRK with efficacy, predictability, and stability and analyzed data through multiple logistic regression analysis to evaluate the independent association of multiple preoperative factors with each of three principle results. RESULTS: Lesser intended correction and lesser intraocular pressure were associated with an increased likelihood of achieving 20/25 or better uncorrected visual acuity. Greater intraocular pressure and lesser corneal opacity were associated with increased predictability. Lesser intended correction was associated with an increased likelihood of stability. Preoperative factors associated with postoperative uncorrected visual acuity are amount of intended correction and intraocular pressure. Predictability is associated with intraocular pressure and degree of corneal opacity. Stability is associated with greater amount of intended correction. CONCLUSIONS: If we consider these factors, we can expect more exact outcome in patient selection, determining timing of fellow eye surgery.