Comparison of Refractive Outcomes in Small-Incision Lenticule Extraction Performed with One or Two Incisions.

Area of Science:

• Ophthalmology
• Refractive Surgery
• Corneal Surgery

Background:

• Small-incision lenticule extraction (SMILE) is a popular laser vision correction procedure.
• The number of incisions used in SMILE may influence refractive outcomes.
• Comparing single and dual-incision techniques is crucial for optimizing surgical results.

Purpose of the Study:

• To compare the refractive outcomes of small-incision lenticule extraction (SMILE) using a single incision versus dual incisions.
• To evaluate the safety and efficacy of both surgical approaches.

Main Methods:

• A retrospective cohort study involving 324 eyes (162 per group).
• Group 1 underwent single-incision SMILE (120°).
• Group 2 underwent dual-incision SMILE (120° and 270°).
• Refractive outcomes were assessed at 3, 6, and 12 months post-surgery.

Main Results:

• Preoperative spherical equivalents were similar between groups (-5.75 D vs. -6.38 D).
• At 12 months, both groups achieved excellent uncorrected visual acuity (UCVA), with 100% reaching 20/25 and over 95% achieving 20/20.
• Postoperative mean spherical equivalents were -0.25 D (single incision) and -0.5 D (dual incision).

Conclusions:

• Dual-incision SMILE is a safe and effective alternative to single-incision SMILE.
• Both techniques offer predictable and stable refractive correction for myopia and myopic astigmatism.
• The choice of incision number does not appear to significantly alter visual outcomes.