Evaluation of a Scanned Laser Display as an Alternative Low Vision Computer InterfaceConor Kleweno, Eric Seibel, P!D!, Kyle Kloec"ner, #ob #urstein, Eri" Viirre, $!D!, P!D!, %omas &urness III!, P!D! 1Problem Statement:Can the Virtual Retinal Display (VRD) be a helpful alternative low vision computer interfaceA testing protocol is needed to compare the two interfaces for low vision use Introduction:'Persons wit low vision find computer use difficult wit te standard computer display (C)%*'A C)% is limited in bri+tness and contrast'Low vision aid software can ma"e computer use cumbersome'%e V)D may be a better alternative for low vision computer users'%e V)D uses a modulated, low power laser tat displays an ima+e directly onto retina usin+ a two mirror scannin+ mecanism, Objectives:'Desi+n a testin+ protocol to compare te V)D wit a standard computer screen display (C)%*'Conduct vision tests wit low vision sub-ects wit different low vision conditions'Determine if te V)D can be an effective alternative low vision computer interface'.se an acuity test to compare visual acuity between te V)D and a C)%/ Objectives (continued):'.se a readin+ speed test to compare readin+ performance between te V)D and a C)% 'Determine wat types of low vision benefit from V)D tecnolo+y'0ave low vision sub-ects compare te 1uality of ima+es displayed between V)D and a C)% in terms of clarity and bri+tness 2Testing Site Setup:'%estin+ conducted in a controlled environment at te Department of Services for te #lind '34 low vision sub-ects wit variety of conditions 4Four Test Conditions:A standard CRT with white on black contrastA standard CRT with red on black contrastThe VRD with red on black contrast with a luminance setting of one half of the measured value of the white on black CRTThe VRD with red on black contrast with a luminance setting that matches the measured value of the white on black CRT Procedure:'C)% acuity test used te wite on blac" contrast'V)D acuity test used te matced luminance settin+')eadin+ speed tests conducted at four caracter an+le si5es'%ree ,6 second trials done at eac caracter an+le si5e'Sub-ects +iven oral 1uestionnaire to obtain sub-ective data on clarity and bri+tness of ima+es 7 Acuity Test:'Acuity tests conducted usin+ te Landolt rin+ test'Pointer arrows were used to assist sub-ect in locatin+ ima+e'Acuity test ran+e was ,6833,9 to ,687:7 Reading Speed Tests:'%ree words sown simultaneously to sub-ect on PowerPoint slides as sown below'Sub-ect manually advanced trou+ slides and orally read te words'.nrelated words used')eadin+ speed evaluated as correctly read words per ,6 second test'#o; placed around words to elp sub-ect locate ima+ebirderstate8 Results:Reading SpeedMean Percent Improvement- 1/ !uminance "R# vs$ %&ite 'RTlson and te Aasin+ton State Department of Services for te #lind, Seattle, Aasin+ton'Bational Science &oundation (Crant number D$I