Optical factors in increased best spectacle-corrected visual acuity after LASIK

Area of Science:

• Ophthalmology
• Refractive Surgery
• Visual Optics

Background:

• Laser-Assisted In Situ Keratomileusis (LASIK) is a common procedure for vision correction.
• Understanding factors influencing visual acuity outcomes is crucial for patient selection and managing expectations.

Purpose of the Study:

• To identify preoperative and intraoperative factors correlating with improved best spectacle-corrected visual acuity (BSCVA) following LASIK.
• To analyze the impact of refractive error type and magnitude on visual outcomes.

Main Methods:

• A prospective clinical trial involving 850 eyes undergoing LASIK for myopia, hyperopia, and mixed astigmatism.
• Analysis of pre- and postoperative BSCVA, refraction, pupil diameter, corneal topography, asphericity, and wavefront aberrations using NIDEK OPD-Scan.
• Comparison of visual outcomes between different refractive error groups and amblyopic eyes.

Main Results:

• A negative correlation was found between increased BSCVA and preoperative BSCVA.
• Mixed astigmatic and highly myopic eyes showed greater BSCVA improvement compared to moderately myopic and hyperopic eyes.
• Induction of spherical aberration negatively correlated with BSCVA gain; no significant difference was noted between normal and amblyopic eyes.

Conclusions:

• Preoperative visual acuity, type of refractive error (mixed astigmatism, high myopia), and the degree of induced spherical aberration are significant predictors of BSCVA improvement after LASIK.
• These findings aid in predicting LASIK outcomes and optimizing surgical planning.