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Visual-field deficits associated with proton beam irradiation for parapapillary choroidal melanoma
S S Park1, S M Walsh, E S Gragoudas
1Department of Ophthalmology, University of Texas Southwestern Medical Center, Dallas, USA.
Purpose:
A large series of patients treated with proton irradiation for parapapillary choroidal melanoma were reviewed retrospectively to determine the frequency of radiation papillopathy and visual-field loss after treatment.
Methods:
Among 249 patients with proton irradiation for parapapillary choroidal melanoma, the authors identified 59 patients who had visual-field testing performed before treatment and at least 18 months after treatment. The visual fields, color fundus photographs, and charts were reviewed to determine the prevalence of radiation papillopathy and visual-field loss after treatment.
Results:
Nineteen of the 59 patients reviewed (31%) received a clinical diagnosis of radiation papillopathy. Progressive visual-field loss, defined as enlargement of absolute scotoma of greater than [corrected] or equal to 30 degrees as compared with the pretreatment visual field, was noted in 67% of patients with radiation papillopathy and 73% of patients without papillopathy. In both groups, visual-field loss correlated with the area of the retina predicted to be exposed to irradiation in the majority of patients.
Conclusions:
Progressive visual-field loss is common after proton irradiation for parapapillary choroidal melanoma. However, the scotoma usually correlates with the area of the retina exposed to irradiation. The development of radiation papillopathy does not appear to be associated with additional visual-field defects in most cases.