Monocular temporal hemianopia in a young patient.

A 12-year-old girl presented with a history of sudden visual hemi-field loss in the left eye. The visual field defect was a clear-cut temporal hemianopia in the left eye; eye was normal. Complete eye examination and neuro-imaging of brain and opto-chiasmal region revealed normal structural findings. The visual field defect was suspected to be non-organic. This assumption was proven to be the diagnosis when simultaneous binocular fields showed the same pattern, although the contralateral eye's nasal hemi-field was intact. This symptom was alleviated by reassurance and placebo treatment.