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Photocoagulation of the fovea
Transactions of the American Ophthalmological Society
|January 1, 1978
Summary
Foveal argon laser photocoagulation for choroidal melanoma can cause outer retinal damage. Despite initial vision loss, recovery occurred, with visually-evoked potential (VEP) changes noted in this case study.
Area of Science:
- Ophthalmology
- Medical Research
Background:
- This study details a case of malignant choroidal melanoma treated with foveal argon laser photocoagulation before enucleation.
- Investigates the effects of low-intensity foveal burns on retinal structure and function.
Observation:
- A foveal argon laser burn destroyed outer retinal layers while sparing inner retinal layers.
- Immediate visual acuity dropped to 20/50 but improved to 20/30 within 24 hours.
Findings:
- Visually-evoked potential (VEP) testing showed altered amplitude and waveform post-photocoagulation.
- Similar retinal damage and VEP changes were observed in experimental animal models and a patient with solar retinopathy.
Implications:
- The findings suggest a low retinal energy density threshold for foveal argon laser photocoagulation, below 0.13 joules/mm².
- Highlights the potential for functional and structural retinal changes even with targeted laser treatment.