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J Cataract Refract Surg. 2016 Aug;42(8):1173-80. doi: 10.1016/j.jcrs.2016.04.034.

Simulated night vision after small-incision lenticule extraction.

Author information

1
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.
2
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.

Abstract

PURPOSE:

To describe simulated night vision, night-vision symptoms, and refractive outcomes after small-incision lenticule extraction.

SETTING:

Tertiary referral eye center, Singapore.

DESIGN:

Prospective case series.

METHODS:

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.

RESULTS:

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.

CONCLUSION:

Small-incision lenticule extraction did not affect simulated night vision or contrast sensitivity, with patients reporting no or mild night-vision symptoms.

FINANCIAL DISCLOSURE:

None of the authors has a financial or proprietary interest in any material or method mentioned.

PMID:
27531294
DOI:
10.1016/j.jcrs.2016.04.034
[Indexed for MEDLINE]

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