A curious case of glaucoma?

An 84-year-old woman diagnosed with primary open-angle glaucoma was referred because her optic nerve appearance did not account for her visual field deficits. Further evaluation showed loss of color vision and rapid progression of visual field defects. Electroretinography revealed abnormal scotopic and photopic responses. Blood samples were positive for anti-retinal antibodies, but a malignancy work-up was negative, consistent with non-paraneoplastic autoimmune retinopathy.