lnu.sePublications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Resolution of static and dynamic stimuli in the peripheral visual field.
Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences. (Section of Optometry and Vision Science)ORCID iD: 0000-0002-8365-0601
KTH, Royal Institute of Technology, Stockholm, Sweden. (Biomedical & X-Ray Physics)
KTH, Royal Institute of Technology, Stockholm, Sweden. (Biomedical & X-Ray Physics)
Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences. (Section of Optometry and Vision Science)
2011 (English)In: Vision Research, ISSN 0042-6989, E-ISSN 1878-5646, Vol. 51, no 16, 1829-1834 p.Article in journal (Refereed) Published
Abstract [en]

In a clinical setting, emphasis is given to foveal visual function, and tests generally only utilize static stimuli. In this study, we measured static (SVA) and dynamic visual acuity (DVA) in the central and peripheral visual field on healthy, young emmetropic subjects using stationary and drifting Gabor patches. There were no differences between SVA and DVA in the peripheral visual field; however, SVA was superior to DVA in the fovea for both velocities tested. In addition, there was a clear naso-temporal asymmetry for both SVA and DVA for isoeccentric locations in the visual field beyond 10° eccentricity. The lack of difference in visual acuity between static and dynamic stimuli found in this study may reflect the use of drift-motion as opposed to displacement motion used in previous studies.

Place, publisher, year, edition, pages
2011. Vol. 51, no 16, 1829-1834 p.
Keyword [en]
DVA; Dynamic visual acuity; Periphery
National Category
Ophthalmology
Research subject
Natural Science, Optometry
Identifiers
URN: urn:nbn:se:lnu:diva-13814DOI: 10.1016/j.visres.2011.06.011PubMedID: 21722661OAI: oai:DiVA.org:lnu-13814DiVA: diva2:435302
Available from: 2011-08-18 Created: 2011-08-18 Last updated: 2017-02-17Bibliographically approved
In thesis
1. Improving Peripheral Vision Through Optical Correction and Stimulus Motion
Open this publication in new window or tab >>Improving Peripheral Vision Through Optical Correction and Stimulus Motion
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The loss of central vision subsequent to macular disease is often extremely debilitating. People with central field loss (CFL) must use other peripheral areas of the retina in order to see; areas with inferior resolution capacity, which are also affected by off-axis optical errors. The overall aim of the work encompassed by this thesis was to identify and evaluate methods of improving vision for people with CFL; with focus on the effects of off-axis optical correction and stimulus motion on resolution acuity and contrast sensitivity.

Off-axis optical errors were measured using a commercially-available COAS-HD VR open-view aberrometer. We used adaptive psychophysical methods to evaluate grating resolution acuity and contrast sensitivity in the peripheral visual field; drifting gratings were employed to   measure the effect of motion on these two measures of visual performance. The effect of sphero-cylindrical correction and stimulus motion on visual performance in healthy eyes and in subjects with CFL was also studied; in addition, the effect of adaptive optics aberration correction was examined in one subject with CFL.

The COAS-HD aberrometer provided rapid and reliable measurements of off-axis refractive errors. Correction of these errors gave improvements in low-contrast resolution acuity in subjects with higher amounts of oblique astigmatism. Optical correction also improved high-contrast resolution acuity in most subjects with CFL, but not for healthy subjects. Adaptive optics correction improved both high and low contrast resolution acuity in the preferred retinal locus of a subject with CFL. The effect of stimulus motion depended on spatial frequency; motion of 7.5 Hz improved contrast sensitivity for stimuli of low spatial frequency in healthy and CFL subjects. Motion of 15 Hz had little effect on contrast sensitivity for low spatial frequency but resulted in reduced contrast sensitivity for higher spatial frequencies in healthy subjects. Finally, high-contrast resolution acuity was relatively insensitive to stimulus motion in the periphery.

This thesis has served to broaden the knowledge regarding peripheral optical errors, stimulus motion and their effects on visual function, both in healthy subjects and in people with CFL. Overall it has shown that correction of off-axis refractive errors is important for optimizing peripheral vision in subjects with CFL; the use of an open-view aberrometer simplifies the determination of these errors. In addition, moderate stimulus motion can have a beneficial effect on contrast sensitivity for objects of predominantly low spatial frequency.

Place, publisher, year, edition, pages
Växjö: Linnaeus University Press, 2016. 172 p.
Series
Linnaeus University Dissertations, 248/2016
Keyword
absolute central scotoma, central visual field loss, eccentric viewing, preferred retinal locus, open-view aberrometer, off-axis refractive errors, eccentric correction, dynamic visual acuity, spatial contrast sensitivity, temporal contrast sensitivity, spatio-temporal contrast sensitivity
National Category
Other Medical Sciences not elsewhere specified
Research subject
Natural Science, Optometry; Natural Science, Biomedical Sciences
Identifiers
urn:nbn:se:lnu:diva-52286 (URN)978-91-88357-14-4 (ISBN)
Public defence
2016-05-19, N2007, Smålandsgatan 26E, Kalmar, 09:45 (English)
Opponent
Supervisors
Available from: 2016-05-13 Created: 2016-04-28 Last updated: 2017-01-27Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textPubMed

Search in DiVA

By author/editor
Lewis, PeterGustafsson, Jörgen
By organisation
School of Natural Sciences
In the same journal
Vision Research
Ophthalmology

Search outside of DiVA

GoogleGoogle Scholar

Altmetric score

Total: 78 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf