Module 3 
 

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Module 3:

 Refractometry Techniques   
 

 
 

OVERVIEW
 

 
 

Estimated study time:  3/4 hour.

 

Target Audience:  This module is appropriate for assistant,  technician, and technologist level personnel with refractometry experience.

 

Pre-requisites:  Refractometry experience

 

Date of original release:  February 2000

 
 

 
 

Section 1:

 Binocular Balancing 
   
 

Description of content:  This section explains the refractive technique of binocular balancing,  a technique used to neutralize undesirable affects of accommodation.

 

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

 

  • explain why balancing is beneficial

  • identify patients who would benefit from balancing

  • list the steps that comprise the balancing  procedure

  • describe the desirable endpoints of the balancing procedure
   
 

Section 2:

 High Power Refractometry
   
 

Description of content:  This section discusses techniques necessary to ensure accuracy in the determination of high power glasses corrections.

 

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

 

  • explain the importance of the vertex distance and describe situations in which it should be measured

  • explain how the vertex distance is measured

  • describe situations in which the over-refraction method and the trial frame method might be useful

  • list the steps used to over-refract a patient

  • explain how a prescription is placed into a trial frame
   
 

Section 3:

 Cylinder Power Optimization
   
 

Description of content:  This section explains how a technique that makes use of the spherical equivalent is used to make sure that the patient has the optimum amount of cylinder correction.

 

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

 

  • define the optimum cylinder power

  • identify spherically equivalent corrections

  • describe the technique used to determine the optimum cylinder power
   
 

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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