This patient has HLA-A29 positive birdshot retinochoroidopathy. (A) Right eye. Visual acuity is 20/200. (B) Left eye. Visual acuity is 20/200. (C) Normal control. Rod ERGs from both eyes are subnormal; there are negative maximal responses (feature often found in this condition) and mildly delayed 30-Hz flicker and photopic ERGs. Although visual acuity is not significantly reduced, PERG from right eye shows nondetectable PSO component with some residual N95, and PERG from left eye is slightly better preserved but of globally reduced amplitude. Patient went on to develop visual acuity loss from cystoid macular edema.