Simulated night vision after small-incision lenticule extraction

Area of Science:

• Ophthalmology
• Refractive Surgery
• Visual Optics

Background:

• Small-incision lenticule extraction (SIL) is a popular refractive surgery technique.
• Understanding its impact on visual function, particularly at night, is crucial for patient satisfaction.
• Previous studies have focused on visual acuity, but detailed analysis of night vision and related symptoms is less common.

Purpose of the Study:

• To evaluate simulated night vision, night vision symptoms, and refractive outcomes following SIL.
• To assess the safety and efficacy of SIL concerning visual performance in low light conditions.

Main Methods:

• A prospective case series involving 50 eyes undergoing SIL with a femtosecond laser.
• Simulated night vision was measured using logMAR corrected distance visual acuity (CDVA) with a specialized chart.
• Refractive outcomes and vision-related symptoms were assessed up to 12 months post-surgery.

Main Results:

• Overall simulated night vision (CDVA) was not significantly affected at 12 months post-SIL (P=.67).
• In patients with low myopia, simulated night vision actually improved post-surgery (P=.008).
• Most patients reported mild or no night vision symptoms, with high efficacy (98%) and safety (1.17) indices.

Conclusions:

• Small-incision lenticule extraction does not adversely affect simulated night vision or contrast sensitivity.
• Patients undergoing SIL generally experience no or only mild night vision symptoms post-procedure.
• SIL demonstrates favorable refractive outcomes, efficacy, and safety, with no detrimental impact on night vision.