THIS COMPREHENSIVE REVIEW MANUAL IS PERFECT FOR ANYONE SEEKING TO GAIN CERTIFICATION IN THE REWARDING FIELD OF OPTICIANRY. SECTION ONE: The reader will walk through twenty essential topics including simplified examples. Covered subjects include: Metric System - Focal Lengths & Lens Powers - Transposition - Astigmatism Classification - Optical Crosses - Finding Power at a Non-Prescribed Axis - Spherical Equivalent - Determining Reading / Intermediate Rx - Vertical Decentration (Above/Below) -Decentration - Minimum Blank Size - Image Jump - Splitting Prism - Prism Direction - Prentices Rule (Spherical Rx's) - Prentices Rule (Cylindrical Rx's) - Vertex Distance - Slab Off - Common Lens Values - Index of RefractionSECTION TWO: In the second part of this manual the reader will encounter a 125 question multiple choice test. SECTION THREE: Answers and Explanations to the 125 question exam