Visual acuity was measured, using a jumping stand technique, in cats which had undergone surgical cyclotorsion of one or both eyes. In cats with unilateral rotations acuity was depressed in the rotated eye and the extent of loss increased with larger amounts of rotation. Cats which had undergone bilateral rotations tended to have lower acuities than normal cats and there was a slight tendency for the eye with the greater rotation to show the larger deficit. Evidence is presented that the lowered acuities were not the result of peripheral damage and it is suggested that the defect may be considered as a form of strabismic amblyopia.