Large optical ablation zone using the VISX S2 smoothscan excimer laser.

Area of Science:

• Ophthalmology
• Refractive Surgery

Background:

• Laser in situ keratomileusis (LASIK) is a common procedure for correcting myopia.
• Advancements in excimer laser technology aim to improve safety and efficacy.

Purpose of the Study:

• To evaluate the safety and efficacy of a new 6.5 mm large-zone photoablation technology.
• Utilizing the VISX S2 Smoothscan excimer laser for myopia and myopic astigmatism correction.

Main Methods:

• Prospective study involving 42 eyes of 21 patients with myopia.
• LASIK procedure performed using a 6.5 mm optical zone with the VISX S2 Smoothscan.
• Patients followed for 1 day, 1 month, and 3 months postoperatively.

Main Results:

• Significant reduction in mean spherical equivalent (SE) by 94% at 3 months.
• 91% of eyes achieved uncorrected visual acuity of 20/40 or better.
• 7.5% of eyes developed steep central islands at 1 month, with no significant glare or halos reported.

Conclusions:

• The 6.5 mm large-zone photoablation with VISX S2 Smoothscan effectively reduces myopia and myopic astigmatism.
• An increased risk of symptomatic steep central islands may occur with the 6.5 mm zone compared to a 6.0 mm zone.