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Objectives: In the current study, the aim was to evaluate the effect difference in lenticule thickness small incision lenticule extraction (SMILE) cases (≤55 μm versus >55 μm) on the visual outcome in a cohort of 61 patients with low myopia (≤3.0 diopters) Methods: The current prospective cohort study included 61 patients undergoing SMILE refractive procedure during the period extending from November, 14 2019 to June 14, 2020, a total of 99 eyes. The study was conducted in Ibsar ophthalmology surgery centre «private medical centre» in the wholly Najaf city, mid-Euphrates region of Iraq. The cases enrolled in the study were all operated by the same ophthalmologist. According to lenticule thickness, eyes were classified into two groups, (≤55 μm versus >55 μm). The main outcome variable was visual acuity postoperative within two short period of time, 1 week and 3 months. Results: Comparison of visual acuity between patients with lenticule thickness of ≤55 μm and patients with lenticule thickness of >55 μm are shown in Table 6. There was no significant difference in UCVA (P = 1.000), significant difference in BCVA (better with lenticule thickness of ≤55 μm) (P = 0.037), no significant difference in VAAS (P = 0.065), and no significant difference in VA3M (P = 0.599). Conclusion: Thin lenticule of less than or equal 55 micrometer to as low as 41 micrometer can be chosen for SMILE with efficacy and safety comparable to that of thicker lenticule provided that the operation is done by well trained and skilled refractive surgeon.

The effect of thin lenticule versus thick lenticule (a cut-off value of 55 micrometer) on the outcome of SMILE in low myopia