Module 47

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Module 47:

More on Refractometry

OVERVIEW

Estimated study time:  One hour.

Program Level:  Intermediate and Advanced

Target Audience:  OMPs wanting to know more than the basic refractometry techniques

Pre-requisites:  Knowledge of basic refractometry techniques

Date of original release:  March 7, 2008

Description of content:   

This module discusses add powers, characteristics of astigmatism, and the red green test for spherical refinement.

Instructional  objectives:  Upon completion of  this section,  the student should be able to:

• discuss the significance of add powers lesss than 1 D and greater than 2.5 D

• identify sets of astigmatic axes that are symmetrical

• explain how knowledge of the symmetrical nature of astigmatism can help in the refractometry process

• identify against-the-rule astigmatism

• explain the advantage of against-the-rule astigmatism

• explain the advantage of with-the-rule-astigmatism

• define the Javal Rule

• calculate the amount and axis of astigmatism from K readings

• explain what the astigmatic dial is used for

• identify procedures associated with the astigmatic dial

• explain what the red/green test is used for

• identify procedures used with the red/green test

About the Author: 

Gary Gallimore is a certified ophthalmic technologist who assists with research at the Eye Foundation of Kansas City and works for a large multi-specialty ophthalmology practice in the metro area of Kansas City.   He has taught CE courses for many years on all subjects of ophthalmic technology. 

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