Evaluation of a scanned laser display as an alternative low vision computer interface
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Evaluation of a Scanned Laser Display as an Alternative Low Vision Computer Interface. Conor Kleweno, Eric Seibel, Ph.D., Kyle Kloeckner, Bob Burstein, Erik Viirre, M.D., Ph.D., Thomas Furness III., Ph.D. . Problem Statement:.

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Evaluation of a scanned laser display as an alternative low vision computer interface

Evaluation of a Scanned Laser Display as an Alternative Low Vision Computer Interface

Conor Kleweno, Eric Seibel, Ph.D., Kyle Kloeckner, Bob Burstein, Erik Viirre, M.D., Ph.D., Thomas Furness III., Ph.D.


Problem statement
Problem Statement: Vision Computer Interface

  • Can the Virtual Retinal Display (VRD) be a helpful alternative low vision computer interface

  • A testing protocol is needed to compare the two interfaces for low vision use

1


Introduction
Introduction: Vision Computer Interface

  • Persons with low vision find computer use difficult with the standard computer display (CRT)

  • A CRT is limited in brightness and contrast

  • Low vision aid software can make computer use cumbersome

  • The VRD may be a better alternative for low vision computer users

  • The VRD uses a modulated, low power laser that displays an image directly onto retina using a two mirror scanning mechanism

2


Objectives
Objectives: Vision Computer Interface

  • Design a testing protocol to compare the VRD with a standard computer screen display (CRT)

  • Conduct vision tests with low vision subjects with different low vision conditions

  • Determine if the VRD can be an effective alternative low vision computer interface

  • Use an acuity test to compare visual acuity between the VRD and a CRT

3


Objectives continued
Objectives (continued): Vision Computer Interface

  • Use a reading speed test to compare reading performance between the VRD and a CRT

  • Determine what types of low vision benefit from VRD technology

  • Have low vision subjects compare the quality of images displayed between VRD and a CRT in terms of clarity and brightness


Testing site setup
Testing Site Setup: Vision Computer Interface

  • Testing conducted in a controlled environment at the Department of Services for the Blind

  • 15 low vision subjects with variety of conditions

4


Four test conditions
Four Test Conditions: Vision Computer Interface

  • A standard CRT with white on black contrast

  • A standard CRT with red on black contrast

  • The VRD with red on black contrast with a luminance setting of one half of the measured value of the white on black CRT

  • The VRD with red on black contrast with a luminance setting that matches the measured value of the white on black CRT

5


Procedure
Procedure: Vision Computer Interface

  • CRT acuity test used the white on black contrast

  • VRD acuity test used the matched luminance setting

  • Reading speed tests conducted at four character angle sizes

  • Three 20 second trials done at each character angle size

  • Subjects given oral questionnaire to obtain subjective data on clarity and brightness of images

6


Acuity test
Acuity Test: Vision Computer Interface

  • Acuity tests conducted using the Landolt ring test

  • Pointer arrows were used to assist subject in locating image

  • Acuity test range was 20/1128 to 20/67

7


Reading speed tests
Reading Speed Tests: Vision Computer Interface

  • Three words shown simultaneously to subject on PowerPoint slides as shown below

  • Subject manually advanced through slides and orally read the words

  • Unrelated words used

  • Reading speed evaluated as correctly read words per 20 second test

  • Box placed around words to help subject locate image

bird

her

state

8


Results reading speed
Results: Reading Speed Vision Computer Interface

9


Results visual acuity subjective responses
Results: Vision Computer Interface Visual acuitySubjective responses

10


Discussion
Discussion: Vision Computer Interface

  • VRD increased visual acuity and reading speed in some low vision subjects

  • Overall, subjects with low vision conditions due to optical causes benefited most from VRD

  • 64% of subjects had equal or better visual acuity with the VRD

  • 71% of subjects found VRD images clearer

  • 79% of subjects found VRD images brighter

  • In general, subjects disliked red on black contrast

  • The testing protocol allowed a valid comparison between the two displays

  • More testing is planned to further define types of low vision that will benefit from VRD

11


Acknowledgements
Acknowledgements: Vision Computer Interface

  • Human Interface Technology (HIT) Lab

  • Howard Hughes Medical Scholar Summer Program

  • John Olson and the Washington State Department of Services for the Blind, Seattle, Washington

  • National Science Foundation (Grant number DMI-9801294)

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