Examining the eye with high resolution ultrasonography, authors encountered 34 cases(41 eyeballs) of cataract and found out its characteristic ultrasonographic findings, though cataract is easily recognized by physician on inspection. Ultrasonographic findings of cataract were as follows; 1. Thickening of lens dut to edema. 2. Demonstration of lens echo in whole circumference. 3. Multiple internal lens echo.