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Resolution of static and dynamic stimuli in the peripheral visual field
KTH, School of Engineering Sciences (SCI), Applied Physics, Biomedical and X-ray Physics.
KTH, School of Engineering Sciences (SCI), Applied Physics, Biomedical and X-ray Physics.ORCID iD: 0000-0001-9172-858X
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 degrees 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]
Visual acuity, Resolution acuity, Dynamic visual acuity (DVA), Peripheral vision, Drifting Gabor
National Category
URN: urn:nbn:se:kth:diva-39514DOI: 10.1016/j.visres.2011.06.011ISI: 000294095300005ScopusID: 2-s2.0-79961028317OAI: diva2:442221

QC 20160427

Available from: 2011-09-20 Created: 2011-09-12 Last updated: 2016-04-27Bibliographically approved
In thesis
1. Peripheral Vision: Adaptive Optics and Psychophysics
Open this publication in new window or tab >>Peripheral Vision: Adaptive Optics and Psychophysics
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis is about our peripheral vision. Peripheral vision is poor compared to central vision, due to both neural and optical factors. The optical factors include astigmatism, defocus and higher order aberrations consisting mainly of coma. Neurally, the density of ganglion cells decreases towards the periphery, which limits the sampling density. The questions that this thesis attempts to answer are how much and under which circumstances correction of optical errors can improve peripheral vision. For this, an adaptive optics system has been constructed with a wavefront sensor and a deformable mirror working in closed loop to perform real-time correction of optical errors. To investigate vision, psychophysical routines utilizing Bayesian methods have been evaluated and modified for peripheral vision to handle the presence of aliasing, fixation instability and rapid fatigue.

We found that correcting both refractive errors and higher order aberrations improved peripheral low-contrast resolution acuity. \\

We looked at two specific topics in peripheral vision research in particular: Central visual field loss and myopia development. Persons with central visual field loss have to rely on their remaining peripheral vision, and it is of great interest to understand whether optical correction can offer them any benefits. In a case study on a single subject, we found meaningful improvements in vision with both optimized refractive correction as well as additional benefits with aberration correction. These improvements were larger than for comparable healthy subjects with a similar magnitude of aberrations. When it comes to myopia development, an interesting hypothesis is that peripheral optics affect and guide the emmetropization process. We have found an asymmetric depth of field in the periphery for myopic subjects, caused by their higher order aberrations, and presented a model on how this asymmetry may influence the emmetropization process.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2013. xiii, 72 p.
Trita-FYS, ISSN 0280-316X ; 2013:08
National Category
Other Physics Topics
urn:nbn:se:kth:diva-120077 (URN)978-91-7501-698-6 (ISBN)
Public defence
2013-04-19, Sal FD5, AlbaNova Universitetscentrum, Roslagstullsbacken 21, Stockholm, 13:00 (English)

QC 20130327

Available from: 2013-03-27 Created: 2013-03-27 Last updated: 2013-04-12Bibliographically approved

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