Two patients with congenital anomalies involving the optic pathways are described. The first case presented a unilateral hypoplastic optic nerve as well as an ipsilateral inferior conus and an elevated disc. The second case showed the features of homonymous hemianopia with sparing of the macula and decreased visual acuity on the side of the affected cerebral hemisphere. Red free photographs were obtained in both cases. The importance of this old new investigative tool in completing a neuro ophthalmological study is stressed.