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Myopic keratomileusis by excimer laser on a lathe
S Ganem1, D Aron-Rosa, M Gross
1Clinique du Belvedere, Boulogne Sur Seine, France.
Journal of Refractive and Corneal Surgery
|September 1, 1994
Summary
This study introduces an improved excimer laser keratomileusis system for precise corneal reshaping. The new method creates a smoother ablation surface, enhancing refractive surgery outcomes.
Area of Science:
- Ophthalmology
- Laser Surgery
- Corneal Reshaping
Background:
- Excimer laser keratomileusis (ELK) delivery systems aim to improve refractive surgery precision.
- Current systems may result in irregular ablation zones.
Purpose of the Study:
- To design an advanced ELK delivery system.
- To enhance the regularity of the refractive cut surface.
- To achieve greater precision in ablation level and shape.
Main Methods:
- A novel ELK delivery system was developed.
- Corneal discs from human and beagle eyes underwent microkeratectomy.
- A 193-nm excimer laser with an oval beam was used for ablation.
- The laser beam was rotated to ensure overlapping pulses for uniform ablation.
Main Results:
- Electron microscopy revealed smooth, circular, and concave ablation zones.
- Histological examination showed stromal thinning without adverse reactions.
- Mean preoperative corneal power decreased significantly postoperatively.
Conclusions:
- The new ELK technique produces a smoother cut surface.
- The clear zone is free from stepwise concavity and irregularities.
- This system offers improved outcomes compared to diaphragm-based systems.