ANSI Application POWER CT BC (Lecture 3 from 2/14/23)

This video explains how to apply ANSI Z80.1 prescription lens power tolerances (SPH, CYL, AXIS, and ADD) to determine if a given lens passes or fails. We'll look at how to determine the error, how to read the chart to determine the tolerance allowed, and whether the lens passes or fails ANSI. We'll also briefly discuss some of the miscellaneous tolerances like lens height, center thickness, and base curve tolerances.