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Vector Analysis of Moderate to High Myopic Astigmatism After Small-Incision Lenticule Extraction (Smile): 12-Month Follow-Up Publisher Pubmed



Jabbarvand M1 ; Khodaparast M1 ; Moravvej Z1, 2 ; Shahraki K1 ; Ahmadi H1, 3 ; Shahraki K1 ; Jamali A5 ; Narooienoori F5
Authors
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Authors Affiliations
  1. 1. Eye Research Center, Farabi Eye Hospital, Tehran University of Medical Sciences, Iran
  2. 2. Eye Research Center, Eye Department, Amiralmomenin Hospital, School of Medicine, Guilan University of Medical Sciences, Rasht, Iran
  3. 3. Department of Ophthalmology, Mazandaran University of Medical sciences, Sari, Iran
  4. 4. Ophthalmic Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
  5. 5. Rehabilitation Research Center, Department of Optometry, School of Rehabilitation Sciences, Iran University Of medical Sciences, Tehran, Iran

Source: European Journal of Ophthalmology Published:2022


Abstract

Purpose: To evaluate the refractive outcomes of small-incision lenticule extraction (SMILE) surgery in moderate to high myopic astigmatism Study Design: Prospective interventional case series Methods: This study evaluated 111 eyes of 68 patients treated with femtosecond SMILE surgery for the correction of myopia and astigmatism. Inclusion criteria were myopia of − 0.5 D or more and astigmatism between − 1.0 D and −5.0 D. Refractive and visual measurements were obtained preoperatively, 1 and 12 month(s) postoperatively. Vector analysis was used to study the astigmatic outcomes at 12-month follow-up. Comparison of results in two groups of patients with astigmatism below and over 3.00 D was performed. Results: The preoperative mean spherical equivalent was −5.48 ± 2.17 D (range − 1.75 to − 10.00 D) and the mean cylinder was −2.02 ± 1.09 D (range − 1.00 to − 5.00 D). The mean postoperative cylinder value was −0.60 ± 0.52 D at 12-month visit. The 12-month safety and efficacy indices were 0.98 ± 0.07 and 0.97 ± 0.12, respectively. The high astigmatism group showed significantly lower safety and efficacy indices. The postoperative residual astigmatism was 0.5 D or less in 73% of the eyes. Higher amount of residual astigmatism was observed in the high astigmatism group. The angle of error was ± 5 degrees in 49% and ± 15 degrees in 87% of the eyes. Conclusion: SMILE surgery is effective and safe method for correcting myopic astigmatism. Vector analysis indicated a tendency for the under correction of astigmatism in subjects with high astigmatism. © The Author(s) 2022.