Deficits in anterograde transport begin in the nasal retina. Retinotopic maps of CTB transport transformed into retinal quadrant and eccentricity coordinates following Siminoff et al. (1966)  and Drager and Hubel (1976) . (A) Colliculus maps for naïve (left), vehicle-group control (middle) and BMD-group control (right) eyes are complete (98-99%) and show location of optic disk (*). (B) Moderate transport deficits (shaded regions) in colliculi from vehicle OHT eyes with 58%, 50% and 43% intact transport (left to right respectively) appear to spread from the nasal retinal representation to the optic disk. (C) Moderate to severe transport deficits in vehicle OHT colliculi with 39%, 19% and 2% intact transport (left to right respectively) continue to spread from the optic disk to other retinal quadrants. (D) BMD treatment ameliorates most transport deficits (96% intact, left) but the same spatial pattern of progression applies for even modest deficits (84% and 80% intact, middle and right respectively). Abbreviations: I, N, S, T indicate inferior, nasal, superior and temporal quadrants of the retina, respectively.