This concise manual covers many of the topics found on the National Optician Certification Examination. Using just one page per topic, these instructional lessons are simplified and "get right to-the-point" for ease of learning!
COVERED TOPICS
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 Refraction