We performed a follow-up study of the visual field in 10 patients with temporo-occipital subcortical cerebral hematoma. The hematoma location was: temporal (3 patients), occipital (4 patients) and temporo-occipital (3 patients). In 7 patients in whom hematoma was 30mm or larger in diameter, surgical treatment was applied, whereas conservative treatment was performed in the other 3 in whom hematoma was under 30mm in diameter and whose visual field defect was slight. In all of 7 patients who underwent surgical treatment, severe visual field defect was recognized. However, visual field was almost fully recovered except for 3 patients who were left with only quadrant hemianopsia. In conclusion, the prognosis of impaired visual field was unexpectedly good with appropriate treatment. When we discuss surgical indication for a subcortical hematoma, not only mortality but functional prognosis should be considered. We considered that a patient with subcortical hematoma that is larger than 30mm in diameter should be treated surgically even if his/her consciousness is not disturbed and only visual field defect is present.