ArticleClinical ophthalmology (Auckland, N.Z.)2025
Evaluating the Impact of Angle Kappa on Effective Optical Zone in Kerato-Lenticule Extraction (KLEx) Surgery with Intraoperative Angle Kappa Adjustment.
Article in Clinical ophthalmology (Auckland, N.Z.), 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Purpose: This study aimed to investigate the influence of preoperative angle kappa on postoperative effective optical zone (EOZ) in KLEx patients with intraoperative angle kappa adjustment. Methods: This retrospective study included 174 eyes from 89 myopic patients who underwent the KLEx procedure with intraoperative angle kappa adjustments. Preoperative angle kappa (µ) was approximated as the chord distance between the pupil center and corneal vertex. The cohort was divided into two groups: large angle kappa (µ > 0.2 mm, n = 84) and small angle kappa (µ ≤ 0.2 mm, n = 90). EOZ parameters, including EOZ reduction ratio (RR=EOZ/planned optical zone, %), major and minor axis, decentration, and eccentricity, were measured at one month postoperatively. Linear regression analyses were performed to assess the relationships between preoperative angle kappa and postoperative EOZ parameters. Results: Postoperatively, RR, major and minor axis, decentration and eccentricity did not differ significantly between groups. Univariate linear regression revealed significant but modest negative correlation of angle kappa with RR and minor axis (adjusted R Conclusion: In conclusion, our study showed that preoperative angle kappa had minimal effect on EOZ parameters in KLEx surgery when appropriate intraoperative adjustments for angle kappa were implemented.
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