title: Simulated night vision after small-incision lenticule extraction.
abstract: To describe simulated night vision, night-vision symptoms, and refractive outcomes after small-incision lenticule extraction.
  
  
  
  Tertiary referral eye center, Singapore.
  
  
  
  Prospective case series.
  
  
  
  All patients had small-incision lenticule extraction using the Visumax 500 kHz femtosecond laser system. The main outcome measure was simulated night vision logMAR corrected distance visual acuity (CDVA) using the super vision test-night vision goggle vision chart at 12 months. Secondary outcomes measures included refractive outcomes (ie, efficacy, predictability, and safety) up to 12 months and vision-related symptoms assessed using a validated questionnaire.
  
  
  
  The study comprised 50 eyes. Overall simulated night vision was not affected (mean CDVA 0.08 logMAR ± 0.1 [SD], P = .67; mean mesopic CDVA -0.02 ± 0.1 logMAR, P = .58) after small-incision lenticule extraction at the 12-month follow-up. In low myopia, simulated night vision improved from preoperatively (mean 0.099 ± 0.07) to 12 months postoperatively (mean 0.006 ± 0.09) (P = .008). Most patients reported mild or no night-vision symptoms 3 months after surgery (score range 1.6 to 2.2). At 12 months, the overall efficacy index was 0.98 ± 0.20, with 100% of eyes attaining an uncorrected visual acuity of 20/40 or better and 86% attaining 20/20 or better. Ninety-four percent eyes were within ±1.0 diopter of the attempted correction, and the overall safety index was 1.17 ± 0.17.
  
  
  
  Small-incision lenticule extraction did not affect simulated night vision or contrast sensitivity, with patients reporting no or mild night-vision symptoms.
  
  
  
  None of the authors has a financial or proprietary interest in any material or method mentioned.
authors.affiliation: From the Singapore National Eye Centre (Ang, Farook, Tan, Mehta), Singapore Eye Research Institute (Ang, Farook, Htoon, Tan, Mehta), Duke-NUS Graduate Medical School (Htoon, Mehta), and the National University Health System (Tan), Singapore.
authors.forename: Marcus
authors.initials: M
authors.lastname: Ang
authors.affiliation: From the Singapore National Eye Centre (Ang, Farook, Tan, Mehta), Singapore Eye Research Institute (Ang, Farook, Htoon, Tan, Mehta), Duke-NUS Graduate Medical School (Htoon, Mehta), and the National University Health System (Tan), Singapore.
authors.forename: Mohd
authors.initials: M
authors.lastname: Farook
authors.affiliation: From the Singapore National Eye Centre (Ang, Farook, Tan, Mehta), Singapore Eye Research Institute (Ang, Farook, Htoon, Tan, Mehta), Duke-NUS Graduate Medical School (Htoon, Mehta), and the National University Health System (Tan), Singapore.
authors.forename: Hla M
authors.initials: HM
authors.lastname: Htoon
authors.affiliation: From the Singapore National Eye Centre (Ang, Farook, Tan, Mehta), Singapore Eye Research Institute (Ang, Farook, Htoon, Tan, Mehta), Duke-NUS Graduate Medical School (Htoon, Mehta), and the National University Health System (Tan), Singapore.
authors.forename: Donald
authors.initials: D
authors.lastname: Tan
authors.affiliation: From the Singapore National Eye Centre (Ang, Farook, Tan, Mehta), Singapore Eye Research Institute (Ang, Farook, Htoon, Tan, Mehta), Duke-NUS Graduate Medical School (Htoon, Mehta), and the National University Health System (Tan), Singapore. Electronic address: jodmehta@gmail.com.
authors.forename: Jodhbir S
authors.initials: JS
authors.lastname: Mehta
mesh_terms: D003319:Corneal Stroma; D006801:Humans; D054018:Lasers, Excimer; D009216:Myopia / Q000628:therapy*; D055254:Night Vision; D011446:Prospective Studies; D012029:Refraction, Ocular; D012846:Singapore