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Comparison of the effects of cylindrical correction with and without iris recognition technology in wavefront laser‐assisted in situ keratomileusis
Author(s) -
Wang TsungJen,
Lin YuHuang,
Chang David CK,
Chou HsiuChu,
Wang IJong
Publication year - 2012
Publication title -
clinical and experimental ophthalmology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.3
H-Index - 74
eISSN - 1442-9071
pISSN - 1442-6404
DOI - 10.1111/j.1442-9071.2011.02614.x
Subject(s) - keratomileusis , astigmatism , medicine , ophthalmology , wavefront , laser , lasik , optics , visual acuity , physics
A bstract Background: To analyse the magnitude of cylindrical corrections over which cyclotorsion compensation with iris recognition (IR) technology is beneficial during wavefront laser‐assisted in situ keratomileusis. Design: A retrospectively comparative case series. Participants or Samples: Fifty‐four eyes that underwent wavefront laser‐assisted in situ keratomileusis without IR (non‐IR group) and 53 eyes that underwent wavefront laser‐assisted in situ keratomileusis with IR (IR group) were recruited. Methods: Subgroup analysis based on baseline astigmatism were: a low degree of astigmatism (≥1.00 D to <2.00 D), a moderate degree of astigmatism (≥2.00 D to <3.00 D) and a high degree of astigmatism (≥3.00 D). Main Outcome Measures: Vector and non‐vector analyses were used for comparison. Results: The mean cylinder was −1.89 ± 0.76 D in the non‐IR group and −2.00 ± 0.77 D in the IR group. Postoperatively, 38 eyes (74.50%) in the IR group and 31 eyes (57.50%) in the non‐IR group were within ± 0.50 D of the target induced astigmatism vector ( P = 0.063). The difference vector was 0.49 ± 0.28 in the IR group and 0.63 ± 0.40 in the non‐IR group ( P = 0.031). In the analysis of subgroups, the magnitude of error was significantly lower in the moderate IR subgroup than that of the moderate non‐IR subgroup ( P = 0.034). Furthermore, the moderate IR subgroup had a lower mean difference vector ( P = 0.0078) and a greater surgically induced astigmatism ( P = 0.036) than those of the moderate non‐IR group. Conclusions: Wavefront laser‐assisted in situ keratomileusis for the treatment of astigmatism using IR technology was effective and accurate for the treatment of myopic astigmatism.