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Measuring Low Vision: Perception and Function.
Measuring Low Vision: Perception and Function.

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자료유형  
 학위논문
Control Number  
0017162587
International Standard Book Number  
9798383704011
Dewey Decimal Classification Number  
153
Main Entry-Personal Name  
Freedman, Andrew C.
Publication, Distribution, etc. (Imprint  
[S.l.] : University of Minnesota., 2024
Publication, Distribution, etc. (Imprint  
Ann Arbor : ProQuest Dissertations & Theses, 2024
Physical Description  
157 p.
General Note  
Source: Dissertations Abstracts International, Volume: 86-02, Section: B.
General Note  
Advisor: Legge, Gordon.
Dissertation Note  
Thesis (Ph.D.)--University of Minnesota, 2024.
Summary, Etc.  
요약The impact of vision impairment affects both what can be perceived as well as how effectively visual tasks can be carried out. Therefore, a complete understanding of the effects of vision impairment must account for both its functional and sensory impact. This dissertation investigates both sides, focusing on function in the context of a visual search task, and focusing on sensation in the context of remote tests of visual acuity and contrast sensitivity. Chapter 1 provides an overview of the thesis and introduces key concepts employed throughout the research. Chapter 2 evaluates how visual impairment affects functioning in the context of a visual search task, focusing on how illumination and contrast affect object visibility, a key factor determining whether a space is safe and easy to move through with impaired vision. While recommendations for improving object visibility typically center on increasing illumination, suggesting "brighter is better," we aimed to determine whether the efficacy of such interventions depend on the degree to which they also increase contrast. Normally sighted participants wore blur goggles that severely restricted their visual acuity, artificially restricting it to 20/1250. They then walked through a room, visually searching for target objects, some of which received enhanced illumination from spotlights. Results showed that enhanced illumination improved the rate at which targets were seen only if it also improved the target's contrast with the background behind it, and this information was used to provide guidelines for implementing focused lighting for visual accessibility. Chapter 3 focuses on evaluating the sensory impact of visual impairment by describing the development and initial validation process for novel remote tests of visual acuity and contrast sensitivity. Remote testing allows patients to undergo vision evaluation from a location outside a clinic, and typically involves the digital presentation of test stimuli over a device the patient owns. Such tests are especially valuable during times when travel is restricted (e.g. COVID-19 lockdown), or for individuals with limited mobility, as the tests can be taken without leaving home. The new tests can measure much poorer acuities than other currently available remote tests, and overcome challenges in contrast calibration not addressed by other digital contrast sensitivity tests. To validate the new tests, normally sighted participants with artificially restricted visual acuity and contrast sensitivity were tested in a laboratory environment using both the remote tests and gold-standard clinical charts for comparison. The novel tests showed good agreement with the charts, demonstrating similar scores with low variance. Chapter 4 reports on the continued validation process of the tests developed in Chapter 3, moving from a controlled laboratory testing environment to remote testing of low vision participants at their homes. We found that the tests demonstrated similar scores on average, but scores were also more variable compared to testing in a laboratory environment, potentially due to uncontrolled viewing conditions in the home environment. Altogether, the studies presented in this dissertation provide insight into how the complex functional and sensory consequences of vision impairment can be both measured and addressed. The guidelines and tools developed in this work serve as valuable resources, applicable to both the creation of visually accessible spaces and the administration of remote vision testing. 
Subject Added Entry-Topical Term  
Cognitive psychology.
Subject Added Entry-Topical Term  
Biomedical engineering.
Subject Added Entry-Topical Term  
Health sciences.
Subject Added Entry-Topical Term  
Computer science.
Index Term-Uncontrolled  
Accessibility
Index Term-Uncontrolled  
Lighting
Index Term-Uncontrolled  
Low vision
Index Term-Uncontrolled  
Remote testing
Index Term-Uncontrolled  
Visual acuity
Index Term-Uncontrolled  
Visual search
Added Entry-Corporate Name  
University of Minnesota Psychology
Host Item Entry  
Dissertations Abstracts International. 86-02B.
Electronic Location and Access  
로그인을 한후 보실 수 있는 자료입니다.
Control Number  
joongbu:658267

MARC

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■1001  ▼aFreedman,  Andrew  C.
■24510▼aMeasuring  Low  Vision:  Perception  and  Function.
■260    ▼a[S.l.]▼bUniversity  of  Minnesota.  ▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a157  p.
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-02,  Section:  B.
■500    ▼aAdvisor:  Legge,  Gordon.
■5021  ▼aThesis  (Ph.D.)--University  of  Minnesota,  2024.
■520    ▼aThe  impact  of  vision  impairment  affects  both  what  can  be  perceived  as  well  as  how  effectively  visual  tasks  can  be  carried  out.  Therefore,  a  complete  understanding  of  the  effects  of  vision  impairment  must  account  for  both  its  functional  and  sensory  impact.  This  dissertation  investigates  both  sides,  focusing  on  function  in  the  context  of  a  visual  search  task,  and  focusing  on  sensation  in  the  context  of  remote  tests  of  visual  acuity  and  contrast  sensitivity.  Chapter  1  provides  an  overview  of  the  thesis  and  introduces  key  concepts  employed  throughout  the  research.  Chapter  2  evaluates  how  visual  impairment  affects  functioning  in  the  context  of  a  visual  search  task,  focusing  on  how  illumination  and  contrast  affect  object  visibility,  a  key  factor  determining  whether  a  space  is  safe  and  easy  to  move  through  with  impaired  vision.  While  recommendations  for  improving  object  visibility  typically  center  on  increasing  illumination,  suggesting  "brighter  is  better,"  we  aimed  to  determine  whether  the  efficacy  of  such  interventions  depend  on  the  degree  to  which  they  also  increase  contrast.  Normally  sighted  participants  wore  blur  goggles  that  severely  restricted  their  visual  acuity,  artificially  restricting  it  to  20/1250.  They  then  walked  through  a  room,  visually  searching  for  target  objects,  some  of  which  received  enhanced  illumination  from  spotlights.  Results  showed  that  enhanced  illumination  improved  the  rate  at  which  targets  were  seen  only  if  it  also  improved  the  target's  contrast  with  the  background  behind  it,  and  this  information  was  used  to  provide  guidelines  for  implementing  focused  lighting  for  visual  accessibility.  Chapter  3  focuses  on  evaluating  the  sensory  impact  of  visual  impairment  by  describing  the  development  and  initial  validation  process  for  novel  remote  tests  of  visual  acuity  and  contrast  sensitivity.  Remote testing  allows  patients  to  undergo  vision  evaluation  from  a  location  outside  a  clinic,  and  typically  involves  the  digital  presentation  of  test  stimuli  over  a  device  the  patient  owns.  Such  tests  are  especially  valuable  during  times  when  travel  is  restricted  (e.g.  COVID-19  lockdown),  or  for  individuals  with  limited  mobility,  as  the  tests  can  be  taken  without  leaving  home.  The  new  tests  can  measure  much  poorer  acuities  than  other  currently  available  remote  tests,  and  overcome  challenges  in  contrast  calibration  not  addressed  by  other  digital  contrast  sensitivity  tests.  To  validate  the  new  tests,  normally  sighted  participants  with  artificially  restricted  visual  acuity  and  contrast  sensitivity  were  tested  in  a  laboratory  environment  using  both  the  remote  tests  and  gold-standard  clinical  charts  for  comparison.  The  novel  tests  showed  good  agreement  with  the  charts,  demonstrating  similar  scores  with  low  variance.  Chapter  4  reports  on  the  continued  validation  process  of  the  tests  developed  in  Chapter  3,  moving  from  a  controlled  laboratory  testing  environment  to  remote  testing  of  low  vision  participants  at  their  homes.  We  found  that  the  tests  demonstrated  similar  scores  on  average,  but  scores  were  also  more  variable  compared  to  testing  in  a  laboratory  environment,  potentially  due  to  uncontrolled  viewing  conditions  in  the  home  environment.  Altogether,  the  studies  presented  in  this  dissertation  provide  insight  into  how  the  complex  functional  and  sensory  consequences  of  vision  impairment  can  be  both  measured  and  addressed.  The  guidelines  and  tools  developed  in  this  work  serve  as  valuable  resources,  applicable  to  both  the  creation  of  visually  accessible  spaces  and  the  administration  of  remote  vision  testing. 
■590    ▼aSchool  code:  0130.
■650  4▼aCognitive  psychology.
■650  4▼aBiomedical  engineering.
■650  4▼aHealth  sciences.
■650  4▼aComputer  science.
■653    ▼aAccessibility
■653    ▼aLighting
■653    ▼aLow  vision
■653    ▼aRemote  testing
■653    ▼aVisual  acuity
■653    ▼aVisual  search
■690    ▼a0633
■690    ▼a0566
■690    ▼a0984
■690    ▼a0541
■71020▼aUniversity  of  Minnesota▼bPsychology.
■7730  ▼tDissertations  Abstracts  International▼g86-02B.
■790    ▼a0130
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17162587▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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