Factors affecting predictability of radial keratotomy

Area of Science:

• Ophthalmology
• Refractive Surgery
• Statistical Analysis

Background:

• Radial keratotomy (RK) has faced criticism regarding its predictability.
• Traditional statistical methods often analyze predictor variables independently, limiting comprehensive understanding.

Purpose of the Study:

• To employ multivariate analysis for a simultaneous assessment of multiple predictor variables in RK.
• To identify key factors influencing refractive outcomes after RK surgery.

Main Methods:

• Multivariate statistical analysis was applied to evaluate various factors.
• Variables included patient age, optical zone size, incision number and depth, preoperative keratometry and applanation tension, and sex.

Main Results:

• The optical clear zone size was identified as the most critical factor affecting refractive change.
• This single variable explained 25% to 50% of the procedure's variability.

Conclusions:

• Multivariate analysis offers a more robust approach to understanding RK outcomes than simple correlational statistics.
• While not fully predictive, this method can guide both novice and experienced RK surgeons in refining their techniques.