We measured the axial length of 170 normal emmetropic eyes using the A-mode of the Ocuscan-400 from Feb. 1, 1982 to August 31. 1982. The results were as follows; 1. The range of the axial length of the eyeball was from 21.73mm to 25.47mm. 2. The mean axial length was 23.62mm, that of males was 23.87mm and 23.22mm in femaies. 3. The eyes with axial length from 23.00 to 24.50mm were found in 103 eyes of 170 eyes (60.6%) and axial lengths below 22.00mm were found in 5 of 170 eyes (2.9%) and above 25.00mm in 6 of 170 eyes (35%).