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Transscleral infrared laser for retinal ablation without retinal visualization in an experimental model
1University of Maryland Medical School, Department of Ophthalmology, Baltimore 21201, USA.
Retina (Philadelphia, Pa.)
|December 29, 2000
Summary
Transscleral diode laser can achieve retinal photocoagulation without causing retinal holes when using a retina probe, even with opaque media. However, a transscleral cyclophotocoagulation probe may create retinal holes.
Area of Science:
- Ophthalmology
- Medical Devices
- Laser Technology
Background:
- Transscleral laser procedures are used for various ophthalmic conditions.
- Reliable retinal photocoagulation without complications is crucial for treatment efficacy.
- Opaque media can hinder direct visualization during laser procedures.
Purpose of the Study:
- To evaluate the reliability of transscleral diode laser for retinal photocoagulation.
- To determine if retinal holes are formed under simulated opaque media conditions.
Main Methods:
- Optimal infrared diode laser power settings were determined in pigmented rabbits.
- Transscleral retinal photocoagulation was applied at 4 mm and 6 mm from the limbus without visualization.
- Testing involved retina and cyclophotocoagulation probes on sclera, conjunctiva, and scleral buckles.
Main Results:
- A retina probe achieved moderate photocoagulation in 75% (4 mm) and 50% (6 mm) of spots.
- Retinal holes were exclusively formed with the transscleral cyclophotocoagulation probe on sclera.
- Burn intensity was associated with conjunctiva for the TSCPC probe (P=0.0001), but not the retina probe (P=0.125).
Conclusions:
- Transscleral infrared photocoagulation with a retina probe did not cause retinal holes, even through conjunctiva, sclera, or scleral buckles.
- The transscleral cyclophotocoagulation probe created retinal holes when placed directly on the sclera.
- Reduced laser power is necessary for treatments closer to the limbus.
