Review?
Reread pages 341-345 in System for Ophthalmic Dispensing. On page 362-3 do #4, 5, 10 – 16, 46 – 48, 53, 55*.
Reread pages 137-142 in Optical Formulas Tutorial. Do the exercises on page 139-140*.
Check with your instructor on whether or not you are expected to memorize and use the formulas.