Here is a split view of someone who needs glasses correction of 0.00 x -6.00 x 180. Notice how the correction (right side) stretches everything horizontally.
Here is a split view of someone who needs glasses correction of 0.00 x -6.00 x 90. Notice how the correction (right side) stretches everything vertically.
Here is a split view of someone who needs glasses correction of 0.00 x -6.00 x 135. Notice how the correction (right side) stretches everything on a diagonal.