J Korean Ophthalmol Soc.  2015 Apr;56(4):494-498. 10.3341/jkos.2015.56.4.494.

The Angle Kappa in Dominant and Non-Dominant Eye

• Kim HK
• Cho KJ

• KMID: 2215698
• DOI: http://doi.org/10.3341/jkos.2015.56.4.494

Abstract

PURPOSE
To evaluate differences between dominant and non-dominant eyes by analyzing angle kappa in dominant and non-dominant eyes.
METHODS
Fifty-seven subjects who had best corrected visual acuity 20/20 in the better-seeing eye and no underlying ocular disease were recruited. Ocular dominance was determined using the hole-in-the-card test. Corneal topography, refractive error, intraocular pressure (IOP), and axial length were evaluated in both eyes.
RESULTS
On corneal topography examination, the angle kappa and white-to-white measurements were significantly smaller in the dominant eye than the non-dominant eye (p = 0.013 and p = 0.045, respectively). However, no significant differences in sim K's' astigmatism (p = 0.210), central corneal thickness (p = 0.533), and anterior chamber depth (p = 0.216) were observed. In addition, cylindrical powers of the subjects measured by autorefraction (AR) were significantly lower in the dominant eye (p = 0.026); however no differences in spherical equivalent measured by AR (p = 0.061), IOP measured using pneumonic tonometer (p = 0.536), or axial length measured using laser biometry (p = 0.093) were observed.
CONCLUSIONS
In this study, we found the angle kappa a new factor in determining the dominant and non-dominant eye. Difference in axial length and spherical equivalent between dominant and non-dominant eye may be associated with the difference in angle kappa.

Keyword

Angle kappa; Cylindrical power; Dominant eye; Non-dominant eye; White-to-white distance

MeSH Terms

Anterior Chamber
Astigmatism
Biometry
Corneal Topography
Dominance, Ocular
Intraocular Pressure
Refractive Errors
Visual Acuity

Figure

• 

  Figure 1. Schematic diagram of the relationship between angle kappa and axial length. (A) In two eyes with a different axial length, eye with the longer axial length has a smaller angle kappa. In the figure, angle Y (of more myopic eye, Y eye) is smaller than angle X (of smaller eye, X eye). (B) X & Y line (X & Y visual axis) mean visual pathway of different eye (X eye is the smaller eye, and Y eye is the more myopic eye). Y line has a smaller angle kappa, and interferes less with the cornea and lens than the X line.

Reference

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