True statement about Jackson's Cross - Cylinder test is: (A) Used for subjective refinement of spherical error, (B) Most commonly uses -0.5D sphere with +0.5D cylinder, (C) Uses spherocylindrical toric lens, (D) All of the above
Answer is C. It is used for subjective refinement of cylindrical error. Most commonly uses -0.5D sphere with +1.0D cylinder.