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A Study in Slab-Off

Author: Jesse Walters, ABOM

Jesse Walters has no relevant financial relationships to disclose. The content and format of this course is presented without commercial bias and does not claim superiority of any commercial product or service.

Course Description

The causes and solutions for unwanted prismatic experience must be understood by every optician. Certain concerns such as large prescription differences between eyes may require specialty lens solutions we don’t frequently come across. This class explores identification, ordering, and verification of slab-off prism. 

Course Objectives

  • Recognize that all lenses are prisms and how alignment, power, and line of sight affects prismatic experience
  • Determine ANSI standards for prism and how to calculate unwanted prism using Prentice’s Rule
  • Identify anisometropia and the potential need for slab-off prism
  • Assess, troubleshoot, and potentially avoid slab-off prism

Course Assessment

There is a 20-question test at the end of the course. A successful passing score of 80% is required on all ABO-NCLE continuing education courses in order to earn the designated number of credits. You will know your grade instantly after completing the course.