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Changes in angle kappa and angle alpha before and after cataract surgery.

Rui Wang1, Tan Long, Xin Gu

  • 1From the Department of Ophthalmology (Wang, Long, Gu, Ma), The First Affiliated Hospital of Northwest University, and Department of Ophthalmology (Wang, Long, Gu, Ma), Xi'an No. 1 Hospital, Xi'an, Shaanxi, China.

Journal of Cataract and Refractive Surgery
|February 13, 2020
PubMed
Summary

Angle kappa magnitude decreased after cataract surgery with multifocal intraocular lens (mIOL) implantation. Angle alpha remained stable, suggesting it

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Area of Science:

  • Ophthalmology
  • Optics
  • Biomedical Engineering

Background:

  • Accurate preoperative assessment is crucial for successful multifocal intraocular lens (mIOL) implantation in cataract patients.
  • Understanding the behavior of angle kappa and angle alpha is essential for predicting visual outcomes and minimizing visual aberrations.
  • Phacoemulsification and mIOL implantation can potentially influence ocular alignment parameters.

Purpose of the Study:

  • To investigate the pre- and postoperative changes in angle kappa and angle alpha.
  • To evaluate the reliability of angle kappa and angle alpha in patients undergoing cataract surgery with mIOL implantation.

Main Methods:

  • Prospective case series involving 81 eyes of 70 cataract patients.
  • Phacoemulsification with mIOL implantation was performed.
  • Angle kappa and angle alpha magnitudes and orientations were measured preoperatively and postoperatively.

Main Results:

  • A significant decrease in angle kappa magnitude was observed post-phacoemulsification.
  • No significant changes were found in the orientation of angle kappa or in the magnitude and orientation of angle alpha.
  • Significant correlations existed between pre- and postoperative measurements for both angles, with displacement vectors noted.

Conclusions:

  • Angle alpha demonstrates a more organized distribution and stability compared to angle kappa.
  • Angle kappa may undergo changes following phacoemulsification.
  • Angle alpha appears to be a more reliable and stable parameter than angle kappa for preoperative evaluation in mIOL candidates.