Large Optical Zones In Klex: 12-Month Refractive, Tomographic And Optical Stability

To Evaluate Refractive, Tomographic, And Optical Stability 12 Months After Keratorefractive Lenticule Extraction (Klex) Using A Large 7.7 Mm Optical Zone.

This Retrospective Single-Surgeon, Single-Center Case Series Includes Consecutive Myopic Patients Treated With Klex Using A 7.7 Mm Optical Zone And 7.9 Mm Cap Diameter. 

Patients Were Evaluated Preoperatively And Followed Up To 12 Months Postoperatively. Outcome Measures Included Uncorrected And Corrected Distance Visual Acuity, Manifest Refraction, Higher-Order Aberrations, Contrast Sensitivity, And Scheimpflug-Based Corneal Tomography. Twelve-Month Findings Were Compared To Early Postoperative Results To Assess Refractive Stability, Optical Quality, And Corneal Structural Behavior Over Time.

Large Optical Zone Klex Demonstrated Sustained Refractive Accuracy And Stability At 12 Months, With Maintenance Of Early Postoperative Visual Acuity Outcomes And No Clinically Relevant Regression. Higher-Order Aberrations Remained Low And Stable, Including Spherical Aberration. Contrast Sensitivity Was Preserved. Tomographic Parameters Showed Stable Anterior And Posterior Corneal Surfaces Without Evidence Of Progressive Thinning, Ectatic Change, Or Adverse Biomechanical Behavior.

Klex Performed With A 7.7 Mm Optical Zone Demonstrates Stable Refractive Outcomes, Preserved Optical Quality, And Tomographic Stability At 12 Months. These Findings Support The Clinical Feasibility Of Larger Optical Zones In Lenticule Extraction Without Evidence Of Long-Term Regression Or Structural Compromise.