Module 1 

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Module 1:

OVERVIEW

Estimated study time:  3/4 hour.

Target Audience:  This module discusses basic concepts.  It is appropriate for assistant and  technician level personnel with limited A-scan experience,  and it provides exam review for experienced personnel.

Pre-requisites:  A basic knowledge of ocular anatomy.

Date of original release:  February 2000

Section 1:

Description of content:  This section covers basic concepts and techniques necessary to arrive at an accurate measurement.  Reflectivity, perpendicularity, gain level,  optical axis, spike height, corneal compression, and velocity of sound are covered.

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

• Define the basic concepts of A-scan biometry.

• Discuss how these concepts affect an accurate measurement.

Section 2:

Description of content:  This section discusses techniques to be used and scan characteristics to watch for that can improve the accuracy of the A-scan.  The hand-held and tonometer mount methods are discussed in detail.

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

• Choose the appropriate mode to use for a given situation. 

• List the steps necessary to perform an accurate A-scan measurement.

• Name appropriate tip disinfection methods.

• Discuss potential sources of error and how to avoid them.

• Describe the characteristics of proper alignment.

Section 3:

Description of content:  This section discusses features that are common to many of the newer A-scan instruments.  Use this section to become more familiar with your current instrument and to help guide you in the purchase of a new or used instrument.

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

• Describe the function and utility of common A-scan features.

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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