Effects of simulated visual impairment on orientation and shape perception Article Swipe
Andrea Li
,
Byron R. Johnson
,
Silvia Sánchez Calderón
,
Chananya Stern
,
Michael R. Martinez
,
Khalid Barnes
,
Brianna Bisogno
,
Carolyn Wood
,
Chayala Friedman
,
Nicole Cavallo
,
Yu‐Chuan Li
·
YOU?
·
· 2017
· Open Access
·
· DOI: https://doi.org/10.1167/17.15.45a
YOU?
·
· 2017
· Open Access
·
· DOI: https://doi.org/10.1167/17.15.45a
Visual impairment is reduced vision due to aging, disease, or injury that cannot be corrected by corrective lenses or surgery. We explore the effects of digitally simulated visual impairment on orientation and shape perception in individuals with normal or corrected-to-normal vision. Relative effects of blur and contrast reduction on perception were examined by equating impairment levels via visual acuity. Specifically, we determined for each subject, levels of blur and contrast reduction needed to reduce visual acuity to 20/40 (minimum acuity required to obtain a driver's license) or 20/60 levels. These impairment levels were then applied to 1.5 cpd and 4.5 cpd horizontally and vertically oriented Gabor stimuli to measure their effects on tilt thresholds. 20/40 levels of blur had no effect on tilt thresholds, however equivalent levels of contrast reduction significantly increased tilt thresholds at both frequencies. Increasing blur to 20/60 levels significantly increased tilt thresholds at 4.5 cpd (but not 1.5 cpd), owing to a higher pass blur filter. Thus even mild levels of contrast reduction, such as that commonly experienced in cataracts, can affect orientation perception. These results are predictable given the frequency content of our stimuli. However it remains to be seen whether similarly predictable effects will be obtained using more complex stimuli processed by higher order mechanisms in the visual system. Effects of blur and reduced contrast on shape perception using radial frequency patterns will be reported. Understanding effects of different forms of impairment may contribute to digital technologies to enhance vision on an individual basis.
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- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.1167/17.15.45a
- OA Status
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- Related Works
- 10
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https://openalex.org/W2776644303Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.1167/17.15.45aDigital Object Identifier
- Title
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Effects of simulated visual impairment on orientation and shape perceptionWork title
- Type
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articleOpenAlex work type
- Language
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enPrimary language
- Publication year
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2017Year of publication
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2017-12-01Full publication date if available
- Authors
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Andrea Li, Byron R. Johnson, Silvia Sánchez Calderón, Chananya Stern, Michael R. Martinez, Khalid Barnes, Brianna Bisogno, Carolyn Wood, Chayala Friedman, Nicole Cavallo, Yu‐Chuan LiList of authors in order
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https://doi.org/10.1167/17.15.45aPublisher landing page
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YesWhether a free full text is available
- OA status
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goldOpen access status per OpenAlex
- OA URL
-
https://doi.org/10.1167/17.15.45aDirect OA link when available
- Concepts
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Contrast (vision), Tilt (camera), Orientation (vector space), Perception, Vernier acuity, Visual impairment, Audiology, Psychology, Visual acuity, Visual perception, Optics, Computer vision, Medicine, Computer science, Mathematics, Physics, Neuroscience, GeometryTop concepts (fields/topics) attached by OpenAlex
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