Statistical analysis of computed tomography scans in the department of ophthalmology

A retrospective analysis was made of computed tomography (CT) scans in 322 patients undergoing CT over a period of 4 years and 4 months. The ratio of males to females was 1.4. The peaks of number of patients were in their second and fifth decades of life. Computed tomography was positive for decreased bilateral visual acuity in 52 % (13/25, Group 1), decreased unilateral visual acuity in 52 % (13/25, Group 2), normal visual acuity associated with disturbed bilateral visual fields in 31 % (5/16, Group 3), disturbed unilateral eye movement unrelated to injury in 37 % (13/35, Group 4), injury related unilateral disturbance of eye movement in 88 % (14/16, Group 5), bilateral exophthalmus in 78 % (25/32, Group 6), and injury in 56 % (20/36, Group 7). Common underlying diseases or causes were brain tumor in Group 1, intracranial lesions and paranasal mucocele in Group 2, occipital lesions in Group 3, intraorbital and intracranial lesions in Group 4, blowout fracture in Group 5, endocrine ophthalmopathy in Group 6, and blowout fracture, optic canal fracture, and foreign body in Group 7. (Namekawa, K.)