ABO NOCE Basic Opticianry

Answer: C - +1.00 +1.00 x 90

The minus prescription +2.00 -1.00 x 180 when transposed to a plus prescription is +1.00 +1.00 x 90. To transpose spherocylindrical lenses, add the cylinder to the sphere, then change the sign of the cylinder, and if the axis is 90 or greater subtract 90. If not, add 90.