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Short-term effects of Q-switched ruby laser on monkey anterior chamber angle
Investigative Ophthalmology & Visual Science
|March 1, 1982
Summary
Q-switched ruby laser application to monkey eyes demonstrated that higher pulse energies (≥45 mJ) caused significant trabecular meshwork damage. Lower energies (20 mJ) showed no appreciable change, indicating a dose-dependent response in the anterior chamber angle.
Area of Science:
- Ophthalmology
- Laser Surgery
- Microscopy
Background:
- The trabecular meshwork is crucial for aqueous humor outflow.
- Understanding laser effects on ocular structures is vital for surgical safety.
Purpose of the Study:
- To investigate the effects of Q-switched ruby laser pulses on the trabecular meshwork.
- To determine the energy thresholds for structural damage and functional changes.
Main Methods:
- Application of Q-switched ruby laser pulses (20-110 mJ) to monkey trabecular meshwork.
- Gonioscopy and scanning electron microscopy for morphological assessment.
- Perfusion studies to evaluate outflow facility.
Main Results:
- A dose-dependent response was observed, with significant anterior chamber angle disruption at energies ≥45 mJ.
- Discrete trabecular damage occurred at 25 mJ; marked alteration at ≥45 mJ.
- Power density ≥150 x 10^8 W/cm² caused extensive tissue disruption; corneal edema and Descemet's membrane tearing noted at higher energies.
Conclusions:
- Q-switched ruby laser treatment causes graded structural damage to the trabecular meshwork.
- Energy levels significantly impact the severity of damage to anterior chamber angle structures.
- Further research is needed to correlate these findings with functional changes in outflow facility.