Module 31 

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Module 31:

Measuring Prism in Glasses

OVERVIEW

Estimated study time:  One hour.

Program Level:  Basic and intermediate

Target Audience:  OMPs with little or no knowledge of prism measurement, and more experienced OMPs wanting review.

Pre-requisites:  Knowledge of basic manual lensometry.

Date of original release:  March 7, 2005

Section 1:

Description of content: This section discusses the technique used for obtaining accurate horizontal prism measurements with a manual lensometer.

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

• describe the significance of lens placement when measuring horizontal prism

• explain the procedure used to measure horizontal prism in a pair of glasses

• explain how to recognize the presence of a horizontal prism correction in a pair of glasses

• given the appearance of the lensometer mires, identify the direction and amount of horizontal prism correction in a pair of glasses

Section 2:

Vertical Prism 

Description of content:  This section discusses the technique used for obtaining accurate vertical prism measurements with a manual lensometer.

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

• describe the significance of the position of the lens stage when measuring vertical prism

• explain the procedure used to measure vertical prism in a pair of glasses

• explain how to recognize the presence of a vertical prism correction in a pair of glasses

• given the appearance of the lensometer mires, identify the direction and amount of vertical prism correction in a pair of glasses

• explain what to do when a prism correction in a pair of glasses has moved the mires off of the lensometer scale

Section 3:

Mixed Prism 

Description of content:  

This section discusses the technique used for obtaining accurate mixed prism measurements with a manual lensometer.

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

• define a mixed prism correction

• explain the procedure used to measure mixed prism in a pair of glasses

• explain how to recognize the presence of a mixed prism correction in a pair of glasses

• given the appearance of the lensometer mires, identify the direction and amount of vertical and horizontal prism correction in a pair of glasses

• explain what to do when a prism correction in a pair of glasses has moved the mires off of the lensometer scale

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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