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Sang-Mok Lee, Hyuk Jin Choi, Mee Kum Kim, Won Ryang Wee; Correlation of Angle Kappa with Ocular Biometric Parameters in Korean: Strong Correlation between Angle Kappa and Axial Length. Invest. Ophthalmol. Vis. Sci. 2016;57(12):5749.
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© ARVO (1962-2015); The Authors (2016-present)
To evaluate the correlation of the total, horizontal, and vertical component of angle kappa with other ocular biometric parameters.
Total 48 eyes of 24 Korean volunteers without any significant ocular disease were enrolled in this study (12 men and 12 women, mean age of 31.3 ± 6.4 years old). Each eye underwent the following ocular biometric data measurements: spherical equivalent (SE) with an autorefractor/keratometer (RK-F1; Canon, Tokyo, Japan); angle kappa, simulated K (Sim K), white-to-white corneal diameter, thinnest corneal thickness, and anterior chamber depth (from endothelium) with slit-scanning topography (Orbscan II, Bausch and Lomb, Rochester, NY, USA); and axial length with partial coherence interferometry (IOLMaster; Carl Zeiss Meditech Inc., Dublin, CA, USA). The Pearson's correlation test was used for the statistical analysis using SPSS for Windows (Version 22.0; SPSS Inc., Chicago, IL) and P < 0.01 was considered statistically significant.
The mean (±SD) total angle kappa was 4.3 (± 1.1) degrees. The total angle kappa showed significant correlation with axial length, SE, Sim K min, and Sim K max (Pearson’s correlation coefficient r = -0.676, P < 0.001; r = 0.532, P = 0.001; r = 0.608, P < 0.001; r = 0.444, P =0.009, respectively). The horizontal component of angle kappa (x- axis intercept) showed significant correlation with axial length and SE (r = -0.557, P <0.001; r = 0.537, P = 0.001, respectively) if modified to represent the nasal direction as positive value. However, the vertical component of angle kappa (y- axis intercept) did not show any significant correlation with any ocular parameters.
The total and horizontal component of the angle kappa showed significant correlation with axial length and SE. The axial length showed stronger correlation than SE with both the total and horizontal component of the angle kappa.
This is an abstract that was submitted for the 2016 ARVO Annual Meeting, held in Seattle, Wash., May 1-5, 2016.
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