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Role of parafovea in blur perception
KTH, School of Engineering Sciences (SCI), Applied Physics.
KTH, School of Engineering Sciences (SCI), Applied Physics, Biomedical and X-ray Physics.ORCID iD: 0000-0002-4894-7944
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2017 (English)In: Vision Research, ISSN 0042-6989, E-ISSN 1878-5646, Vol. 138, p. 59-65Article in journal (Refereed) Published
Abstract [en]

The blur experienced by our visual system is not uniform across the visual field. Additionally, lens designs with variable power profile such as contact lenses used in presbyopia correction and to control myopia progression create variable blur from the fovea to the periphery. The perceptual changes associated with varying blur profile across the visual field are unclear. We therefore measured the perceived neutral focus with images of different angular subtense (from 4° to 20°) and found that the amount of blur, for which focus is perceived as neutral, increases when the stimulus was extended to cover the parafovea. We also studied the changes in central perceived neutral focus after adaptation to images with similar magnitude of optical blur across the image or varying blur from center to the periphery. Altering the blur in the periphery had little or no effect on the shift of perceived neutral focus following adaptation to normal/blurred central images. These perceptual outcomes should be considered while designing bifocal optical solutions for myopia or presbyopia.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 138, p. 59-65
Keywords [en]
Angular subtense, Blur adaptation, Central vision, Perceived neutral focus, Peripheral blur
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Identifiers
URN: urn:nbn:se:kth:diva-212253DOI: 10.1016/j.visres.2017.07.005ISI: 000408398200007Scopus ID: 2-s2.0-85026529361OAI: oai:DiVA.org:kth-212253DiVA, id: diva2:1133990
Funder
EU, FP7, Seventh Framework Programme, PITNGA- 2010-264605Swedish Research Council, 621-2011-4094EU, European Research Council, ERC-2011- AdC 294099
Note

QC 20170817

Available from: 2017-08-17 Created: 2017-08-17 Last updated: 2017-09-27Bibliographically approved

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CiteExportLink to record
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  • apa
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