Korean J Ophthalmol.  2017 Jun;31(3):257-262. 10.3341/kjo.2016.0021.

Measurement of Angle Kappa Using Ultrasound Biomicroscopy and Corneal Topography

Affiliations
  • 1Department of Ophthalmology, Chung-Ang University College of Medicine, Seoul, Korea. lk1246@hanmail.net

Abstract

PURPOSE
To introduce a new convenient and accurate method to measure the angle kappa using ultrasound biomicroscopy (UBM) and corneal topography.
METHODS
Data from 42 eyes (13 males and 29 females) were analyzed in this study. The angle kappa was measured using Orbscan II and calculated with UBM and corneal topography. The angle kappa of the dominant eye was compared with measurements by Orbscan II.
RESULTS
The mean patient age was 36.4 ± 13.8 years. The average angle kappa measured by Orbscan II was 3.98°± 1.12°, while the average angle kappa calculated with UBM and corneal topography was 3.19°± 1.15°. The difference in angle kappa measured by the two methods was statistically significant (p < 0.001). The two methods showed good reliability (intraclass correlation coefficient, 0.671; p < 0.001). Bland-Altman plots were used to demonstrate the agreement between the two methods.
CONCLUSIONS
We designed a new method using UBM and corneal topography to calculate the angle kappa. This method is convenient to use and allows for measurement of the angle kappa without an expensive device.

Keyword

Angle kappa; Corneal topography; Ultrasound biomicroscopy

MeSH Terms

Corneal Topography*
Humans
Male
Methods
Microscopy, Acoustic*
Ultrasonography*
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