Von herick's angle grade 3 of anterior chamber denotes: (A) Wide open angle, (B) Moderately open angle, (C) Moderately narrow angle, (D) Closed angle
Answer is B. Von Herick's technique compares the depth of peripheral anterior chamber with the corneal thickness. The method involves a narrow slit of light from a slit lamp being projected on to the peripheral cornea at an angle of 60deg as near as possible to the limbus. Ratio Angle closure Angle grade 1:1 open angle VH grade 4 1:1/2 Moderately open angle VH grade 3 1: 1/4 Moderately narrow angle VH grade 2 1: <1/4 angle closure likely VH grade 1