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The correlation between angle kappa and ocular biometry in Koreans.

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Angle kappa, a measure of the eye's visual axis alignment, increases with age and refractive error. This finding is crucial for refractive and strabismus surgery planning in older and hyperopic individuals.

Keywords:
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Area of Science:

  • Ophthalmology
  • Optometry
  • Biometry

Background:

  • Angle kappa describes the angular displacement between the pupil center and the visual axis.
  • Understanding normative angle kappa values and their correlations is essential for accurate ophthalmic procedures.

Purpose of the Study:

  • To establish normative angle kappa data in a Korean population.
  • To investigate correlations between angle kappa and ocular biometric measurements, including refractive error and axial length.
  • To examine demographic influences on angle kappa.

Main Methods:

  • Analysis of data from 436 eyes using Orbscan II for angle kappa measurement.
  • Ocular biometric data (spherical equivalent, interpupillary distance, axial length) collected via IOL Master.
  • Statistical analysis to determine correlations between angle kappa, biometry, and demographics.

Main Results:

  • Angle kappa showed a mean of 4.70 ± 2.70 degrees in males and 4.89 ± 2.14 degrees in females.
  • Significant correlations were found between angle kappa and axial length (r = -0.342) and spherical equivalent (r = 0.197).
  • Axial length and spherical equivalent exhibited a negative correlation (r = -0.540, p < 0.001).

Conclusions:

  • Angle kappa values increase with higher spherical equivalent and patient age.
  • Surgical planning for refractive or strabismus procedures requires careful consideration of angle kappa in older and hyperopic patients.