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Related Experiment Video

Updated: Sep 19, 2025

Author Spotlight: Advancements in Refractive Surgical Correction for Presbyopia and Exploring Postoperative Visual Acuity
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Alpha and Kappa angle on postoperative visual quality in cataract surgery.

Xiao-Na Chen1, Ying-Yue Xiong1, Jia Wei1

  • 1Jinan University, Guangzhou 510632, Guangdong Province, China.

International Journal of Ophthalmology
|June 19, 2025
PubMed
Summary

Preoperative Kappa angle, not Alpha angle, impacts visual quality after multifocal intraocular lens (MIOLs) implantation. Consider relaxing the Kappa angle standard based on axial length and keratometry for better patient selection.

Keywords:
alpha anglecataract surgerykappa angleocular biometric instrumentspostoperative visual quality

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Area of Science:

  • Ophthalmology
  • Optometry
  • Biomedical Optics

Background:

  • Accurate measurement of ocular angles is crucial for predicting visual outcomes.
  • Multifocal intraocular lenses (MIOLs) implantation aims to improve visual quality but can be affected by preoperative ocular parameters.

Purpose of the Study:

  • To investigate the influence of preoperative Alpha angle and Kappa angle on postoperative visual quality after MIOLs implantation.
  • To establish predictive models for these angles based on patient demographics and ocular measurements.

Main Methods:

  • Collected Alpha and Kappa angles using IOL Master 700, iTrace, and Pentacam before and after cataract surgery.
  • Assessed postoperative visual quality indicators including high-order aberrations (HOA), modulation transfer function (MTF), and point spread function (PSF).
  • Employed multiple linear regression and Pearson correlation analyses to determine relationships between angles and various ocular parameters.

Main Results:

  • Developed predictive models for Alpha and Kappa angles based on age, axial length, keratometry, and corneal white-to-white distance.
  • Found a weak positive correlation between Alpha and Kappa angles (r=0.291, P=0.000).
  • Kappa angle significantly predicted HOA, MTF, and PSF, while Alpha angle did not.

Conclusions:

  • Patients with older age, flatter keratometry, and shorter corneal white-to-white distance may have larger Alpha and Kappa angles.
  • Kappa angle is a significant predictor of postoperative visual quality and should be carefully considered during MIOLs selection.
  • The preoperative standard for Kappa angle may be relaxed based on axial length and keratometry.