Module 35

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Module 35:

Hard Contact Lenses

(Rigid Gas Permeable)

OVERVIEW

Estimated study time:  One hour.

Program Level:  Basic and intermediate, with some advanced material.

Target Audience:  OMPs wanting to learn about hard contact lenses or to review for the technician level exam.

Pre-requisites:  None, although knowledge of basic optics and ocular anatomy is helpful.

Date of original release:  March 7, 2006

Description of content:   

This module is part 1 of a 2 part discussion of hard contact lenses.  Included in the discussion are lens parameters, lens fitting designs, and criteria for evaluating the fit of the rigid gas permeable contact lens.

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

• identify factors and terminology related to oxygen transmission to the cornea during contact lens wear

• define terminology associated with hard contact lens fitting

• define the primary function of the corneal topographer

• list the steps in computing the initial hard contact lens power

• explain how a spherical hard contact lens corrects corneal astigmatism

• define terminology related to the RGP lens "base curve/ power" relationship

• list characteristics of the two main hard contact lens fitting techniques

• identify factors that affect the fit of a hard contact lens

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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