Wernicke's hemianopic pupil indicates lesion in the optic tract. In this condition light reflex is absent when light is thrown on temporal half of the retina of the affected side and nasal half of retina of the opposite side. In this condition light reflex is present when light is thrown on nasal half of affected side and temporal half of affected side. This patient also has homonymous hemianopia. Ref: Textbook of Ophthalmology edited by Sunita Agarwal, page 304.