Ocular deviation (OD) measurements in T2-weighted axial images of brain MRIs.Three lines were drawn to measure OD values in T2-weighted axial images. The first line (A) was drawn on the midline of the nasal structures. The second line (B) connected both ends of the lens. The third line (C) was drawn perpendicular to line B. We measured the angle formed by the intersection of lines A and C (arrow).