Module 14 
 

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Module 14:

 Visual Fields - Automated,

What the Printout tells us about Reliability
 

 
 

OVERVIEW
 

 
 

Estimated study time:  One hour.

 

Program Level: Intermediate

 

Target Audience:  OMPs presently performing or planning to perform automated perimetry,  particularly with the Humphrey Field Analyzer.

 

Pre-requisites:  Modules 11, 12, and 13 or knowledge of basic visual field concepts.  Some experience with a Humphrey Field Analyzer is helpful, but not required.

 

Date of original release:  April 2002
   
 

Description of content:  This Module describes how to read the printout from the Humphrey Field Analyzer. The information on the printout gives clues as to the reliability of the test. This information can be used to determine if a test just completed needs to repeated.  Information from a previous HVA field test printout can be used to improve the reliability of a test about to be performed. There is some overlap of subject matter with Module 13, but more detail is given for the more complex concepts.

 

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

  • Describe the methods by which the Humphrey Field Analyzer monitors patient fixation

  • Describe how the HFA tests for false positives and false negatives

  • Describe the significance of false positive and false negative responses

  • Describe the significance of testing time

  • List the steps necessary to test the foveal theshold

  • Identify the effect of a small pupil on the visual field test

  • List the steps necessary to calculate the trial lens needed for HFA testing

  • Match the numeric dB readings with the brightness level of the stimulus

  • Match the shade of the grayscale graph with the sensitivity level of the retina

  • Describe the significance of dB readings and the appearance of the grayscale graph as indicators of reliability.
   
  Financial Interest Statement:  Neither I, nor a member of my family, nor my professional partnership or corporation, currently have or have ever had a financial interest in Zeiss Humphrey, or a financial relationship or advisory capacity with Zeiss Humphrey related to this presentation.

Gary Gallimore, COMT
   
 

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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