Wavefront-guided LASIK for myopia: effect on visual acuity, contrast sensitivity, and higher order aberrations

Area of Science:

• Ophthalmology
• Refractive Surgery
• Visual Optics

Background:

• Myopia and astigmatism are common refractive errors impacting visual quality.
• Laser-assisted in situ keratomileusis (LASIK) is a prevalent surgical option for correcting these conditions.
• Wavefront-guided LASIK aims to optimize visual outcomes by addressing individual aberrations.

Purpose of the Study:

• To evaluate the effects of wavefront-guided LASIK on visual acuity and contrast sensitivity in myopic eyes.
• To assess the impact on higher-order aberrations (HOAs) after wavefront-guided LASIK.
• To compare outcomes under both high and low contrast conditions, and photopic and mesopic lighting.

Main Methods:

• Bilateral wavefront-guided LASIK was performed on 324 eyes of 162 patients with myopia and/or astigmatism.
• Visual acuity and contrast sensitivity were measured using standard charts and gratings.
• Higher-order aberrations were quantified using a Shack-Hartmann wavefront sensor.

Main Results:

• 84% of eyes achieved 20/20 or better uncorrected visual acuity six months post-surgery.
• Significant improvements were observed in high and low contrast best spectacle-corrected visual acuity (BSCVA).
• Contrast sensitivity improved significantly under photopic and mesopic conditions; specific HOAs changed, but spherical aberration did not significantly increase.

Conclusions:

• Wavefront-guided LASIK effectively enhances visual acuity and contrast sensitivity in myopic patients.
• Despite some increase in HOAs, the procedure yields excellent visual results.
• The lack of significant change in spherical aberration is a key advantage over non-wavefront-guided LASIK.