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KMID : 1011420190240010077
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Journal of Korean Ophthalmic Optics Society
2019 Volume.24 No. 1 p.77 ~ p.82
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Measurement of Ocular Torsion Using Iris Imaging during Fixation
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Oh Kwang-Keun
Cho Hyun-Gug
Moon Byeong-Yeon
Kim Sang-Yeob
Yu Dong-Sik
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Abstract
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Purpose: To evaluate the reliability of ocular torsion measurement using iris imaging during fixation.
Methods: Subjective refraction tests were conducted in 32 subjects (mean age, 23.78±1.90 years). A slit lamp microscope was used to capture iris images during fixation with different head tilt conditions (0° and 10° to the right and left, respectively). Ocular torsions were measured three times based on the difference in angle between 0° and 10° of head tilt positions. Reliability was evaluated using repeated measures ANOVA, paired t-test, and pearson’s correction moreover, 95% limits of agreements were evaluated by comparing ocular torsions measured using fundus images.
Results: Ocular torsions measured three times using iris images at the head tilt positions of 0° and 10° to the right and left were not significantly different (p = 0.508 for rightward tilt, p = 0.985 for leftward). The comparisons of ocular torsion measured using iris and fundus imaging showed no significant differences (p = 0.124 for rightward tilt, p = 0.386 for leftward tilt). Correlations between the two measurements were high (0.880 for rightward tilt and 0.935 for leftward tilt, with narrow 95% limits of agreement).
Conclusions: Measurement of ocular torsion using iris imaging revealed a high reliability among repeated measurements and showed good agreement with measurements of ocular torsion using fundoscopy. Therefore, iris imaging may be useful if it is difficult to obtain a fundal image using fundoscopy during fixation.
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KEYWORD
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Ocular torsion, Iris image, Fundus image, Head tilt, Slit lamp microscope, Funduscope
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