Corneal higher-order aberrations in phlyctenular keratitis
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CLINICAL INVESTIGATION
Corneal higher‑order aberrations in phlyctenular keratitis Taiichiro Katayama1 · Yukari Yagi‑Yaguchi1 · Osama Ibrahim1 · Jun Shimazaki1 · Takefumi Yamaguchi1 Received: 18 October 2019 / Accepted: 18 June 2020 © Japanese Ophthalmological Society 2020
Abstract Purpose To characterize tomographic patterns and quantify corneal higher-order aberrations (HOAs) in eyes with corneal scar due to phlyctenular keratitis. Study design Retrospective consecutive case series. Methods This study included 51 eyes of 38 patients (24 women; 14 men) with corneal scar due to phlyctenular keratitis. HOAs of the total cornea, and of the anterior and posterior surfaces were measured using anterior segment optical coherence tomography (AS-OCT). Corneal tomographic patterns were classified into five types: increased regular astigmatism, ectasia, asymmetric, flattening and minimal change patterns. The correlation between corneal HOAs and visual acuity was evaluated. Results Mean months from onset was 50.7 ± 74.7 and mean number of recurrences 2.1 ± 1.1 (1–5). Mean logarithm of the minimal angle of resolution (logMAR) was 0.19 ± 0.31. AS-OCT showed ectasia pattern in 16 eyes (31.4%), asymmetric pattern in 12 eyes (23.5%), increased regular astigmatism pattern in 9 eyes (17.6%), flattening pattern in 3 eyes (5.9%) and minimal change pattern in 11 eyes (21.6%). HOAs of the total cornea were 0.57 ± 0.44 μm and 1.16 ± 0.77 μm within a 4-mm and 6-mm diameter, significantly larger than in normal controls (P
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