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Photodynamic therapy for corneal neovascularization using topically administered ATX-S10 (Na)
1Department of Ophthalmology, Osaka City University Medical School, Osaka, Japan. yuko-go@med.osaka-cu.ac.jp
Ophthalmic Surgery and Lasers
|September 8, 2000
Summary
Topical photodynamic therapy (PDT) with ATX-S10(Na) effectively occluded experimental corneal neovascularization (CoNV) in rabbits. This approach offers a potential treatment for CoNV, avoiding systemic administration side effects.
Area of Science:
- Ophthalmology
- Biomedical Engineering
- Photomedicine
Background:
- Corneal neovascularization (CoNV) poses a significant threat to vision.
- Photodynamic therapy (PDT) is a promising treatment modality for various medical conditions.
- Previous studies explored systemic administration of photosensitizers for CoNV treatment.
Purpose of the Study:
- To evaluate the efficacy of topical ATX-S10(Na) in photodynamic therapy for corneal neovascularization (CoNV).
- To assess the feasibility of using a topical photosensitizer for CoNV treatment in a rabbit model.
Main Methods:
- Rabbit eyes with induced CoNV were treated with ATX-S10(Na) eye drops (10 mg/mL).
- Topical administration was followed by diode laser irradiation (670 nm) within 20 minutes.
- Fluence levels ranged from 510-1019 J/cm2.
Main Results:
- Corneal neovascularization (CoNV) occlusion was observed in 7 out of 16 treated rabbit eyes.
- The therapeutic effect showed variability compared to previous studies using systemic administration.
- Fluorescein angiography confirmed the occlusion of CoNV.
Conclusions:
- Topical ATX-S10(Na) photodynamic therapy (PDT) demonstrated potential for treating corneal neovascularization (CoNV).
- This topical approach may circumvent the side effects associated with systemic dye administration.
- Optimization of eye drop formulation (pH, osmotic pressure) is necessary for enhanced dye accumulation and efficacy.