Study Status: Completed
Recruit Status: Completed
Study Type: Observational
Official Title: Changes in Regional Retinal Oxygen Extraction and Function After Radiation Therapy
Brief Summary: The investigators propose using retinal oximetry to assess for abnormalities in regional retinal oxygen consumption in previously- irradiated patients, and relate these abnormalities to changes in regional retinal function (i.e. visual field abnormalities). Since different regions of retina receive different radiation doses, the investigators will assess for a dose response as well.