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Corneal topography analysis before and after radial keratotomy
1Zhongshan Ophthalmic Center, Sun Yat-sen University of Medical Sciences, Guangzhou.
Summary
Radial keratotomy (RK) alters corneal shape from positive to negative aspheric surfaces, changing topographic patterns. This surgery flattens central cornea regions, significantly impacting surface asymmetry for improved myopia correction.
Area of Science:
- Ophthalmology
- Corneal Surgery
- Refractive Surgery
Background:
- Mild to moderate myopia is often treated with refractive surgical procedures.
- Radial keratotomy (RK) aims to correct myopia by flattening the central cornea.
Purpose of the Study:
- To analyze changes in corneal topography before and after radial keratotomy (RK) in myopia patients.
- To evaluate the impact of RK on corneal shape, regularity, and asymmetry.
Main Methods:
- Computer-assisted photokeratography was used to analyze corneal topography.
- 58 eyes of 42 patients with mild or moderate myopia were examined before and after RK.
Main Results:
- Corneal surfaces shifted from positive to negative aspheric shapes in 76% of eyes post-RK.
- Topographic patterns changed from symmetric/asymmetric bow tie to round, dumbbell, or belt shapes.
- Surface asymmetry index (SAI) changed significantly, while surface regularity index (SRI) remained stable.
Conclusions:
- RK significantly flattens central and peripheral cornea, particularly around 1.14 mm from the optical center.
- Corneal topographic analysis provides an objective basis for RK planning and effect evaluation.
- Understanding these topographical changes can improve RK clinical outcomes and quality.