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Acute ultrastructural changes of cornea after excimer laser ablation
Investigative Ophthalmology & Visual Science
|March 1, 1992
Summary
High repetition rates in argon fluoride excimer laser corneal surgery can cause significant surface coagulation and damage to the endothelium. These findings suggest potential irreversible corneal damage with specific laser parameters.
Area of Science:
- Ophthalmology
- Laser Surgery
- Corneal Science
Background:
- Excimer lasers are widely used in corneal surgery.
- Understanding the impact of laser parameters on corneal tissue is crucial for surgical safety.
Purpose of the Study:
- To investigate corneal ultrastructural changes induced by an argon fluoride excimer laser.
- To determine the effect of varying light doses per pulse, repetition rates, and total light doses on corneal tissue.
Main Methods:
- Rabbit corneas were ablated using an argon fluoride excimer laser with controlled parameters.
- Transmission electron microscopy was employed to examine corneal ultrastructure post-ablation.
Main Results:
- Subthreshold light doses per pulse combined with high repetition rates (>30 Hz) and prolonged exposure (>100 sec) led to surface coagulation and increased pseudomembrane thickness.
- High repetition rates (e.g., 80 Hz) caused endothelial and Descemet's membrane damage at ablation depths that were safe at lower repetition rates (<40 Hz).
Conclusions:
- Corneal ablations performed at subthreshold light doses per pulse with high repetition rates may induce significant ultrastructural changes.
- High repetition rates during excimer laser corneal surgery pose a risk of irreversible corneal damage, particularly to the endothelium and Descemet's membrane.