Korean J Ophthalmol.  2013 Dec;27(6):421-424. 10.3341/kjo.2013.27.6.421.

The Correlation between Angle Kappa and Ocular Biometry in Koreans

• Choi SR
• Kim US

• KMID: 1792077
• DOI: http://doi.org/10.3341/kjo.2013.27.6.421

Abstract

PURPOSE
To investigate normative angle kappa data and to examine whether correlations exist between angle kappa and ocular biometric measurements (e.g., refractive error, axial length) and demographic features in Koreans.
METHODS
Data from 436 eyes (213 males and 223 females) were analyzed in this study. The angle kappa was measured using Orbscan II. We used ocular biometric measurements, including refractive spherical equivalent, interpupillary distance and axial length, to investigate the correlations between angle kappa and ocular biometry. The IOL Master ver. 5.02 was used to obtain axial length.
RESULTS
The mean patient age was 57.5 +/- 12.0 years in males and 59.4 +/- 12.4 years in females (p = 0.11). Angle kappa averaged 4.70 +/- 2.70 degrees in men and 4.89 +/- 2.14 degrees in women (p = 0.48). Axial length and spherical equivalent were correlated with angle kappa (r = -0.342 and r = 0.197, respectively). The correlation between axial length and spherical equivalent had a negative correlation (r = -0.540, p < 0.001).
CONCLUSIONS
Angle kappa increased with spherical equivalent and age. Thus, careful manipulation should be considered in older and hyperopic patients when planning refractive or strabismus surgery.

Keyword

Axial length; Corneal topography; Refractive errors

MeSH Terms

Anterior Chamber/*pathology
*Axial Length, Eye
Diagnostic Techniques, Ophthalmological/*instrumentation
Equipment Design
Female
Follow-Up Studies
Humans
Male
Middle Aged
Morbidity/trends
Refractive Errors/*diagnosis/epidemiology
Republic of Korea/epidemiology
Retrospective Studies

Figure

• 

  Fig. 1 Normative data of angle kappa and axial length (AL) according to age.

• 

  Fig. 2 Angle kappa according to refractive errors.

Reference

1. Hashemi H, KhabazKhoob M, Yazdani K, et al. Distribution of angle kappa measurements with Orbscan II in a population-based survey. J Refract Surg. 2010; 26:966–971.

2. Von Noorden GK, Campos EC. Binocular vision and ocular motility: theory and management of strabismus. 6th ed. St. Louis: Mosby;2002. p. 169–173.

3. Stone N, Weir CR. Beware angle kappa: an unusual problem following strabismus surgery. Strabismus. 2009; 17:165–166.

4. Basmak H, Sahin A, Yildirim N, et al. Measurement of angle kappa with synoptophore and Orbscan II in a normal population. J Refract Surg. 2007; 23:456–460.

5. Basmak H, Sahin A, Yildirim N, et al. The angle kappa in strabismic individuals. Strabismus. 2007; 15:193–196.

6. Blake CR, Lai WW, Edward DP. Racial and ethnic differences in ocular anatomy. Int Ophthalmol Clin. 2003; 43:9–25.

7. Barretto RL, Mathog RH. Orbital measurement in black and white populations. Laryngoscope. 1999; 109(7 Pt 1):1051–1054.

8. Au Eong KG, Tay TH, Lim MK. Race, culture and Myopia in 110,236 young Singaporean males. Singapore Med J. 1993; 34:29–32.

9. McMahon TT, Irving EL, Lee C. Accuracy and repeatability of self-measurement of interpupillary distance. Optom Vis Sci. 2012; 89:901–907.

10. Kahn DM, Shaw RB Jr. Aging of the bony orbit: a three-dimensional computed tomographic study. Aesthet Surg J. 2008; 28:258–264.

11. Giovanni F, Siracusano B, Cusmano R. The angle kappa in ametropia. New Trends Ophthalmol. 1988; 3:27–33.

12. Lam CS, Goh WS. The incidence of refractive errors among school children in Hong Kong and its relationship with the optical components. Clin Exp Optom. 1991; 74:97–103.