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Naso-temporal Asymmetry of Peripheral Static and Dynamic Visual Acuity
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)Conference paper, (Refereed)
Abstract [en]

Summary

Static and dynamic visual acuity was evaluated in the peripheral visual field on normally sighted emmetropes. The results show a significant asymmetry for both static and dynamic visual acuity between the nasal and temporal visual fields.

 

Introduction

It is well known that visual performance thresholds decrease rapidly with increasing retinal eccentricity1. This reduction in performance can be attributed to both optical factors and reduced neural sampling2-3; the latter being the predominant limiting factor in the peripheral retina3.  Previous studies have shown that slowly moving stimuli are more easily resolved than stationary stimuli in the peripheral retina4. There is little evidence published regarding resolution thresholds for moving stimuli in more than a few limited directions in the visual field.     

In this study, static visual acuity (SVA) and dynamic visual acuity (DVA) thresholds were measured at 10° intervals both nasally and temporally on healthy, young emmetropes. DVA was measured at angular velocities of 1 °/s and 2 °/s using drifting Gabor patches.  

 

Discussion

Static and dynamic visual acuity was measured on the right eye of emmetropic subjects. Results for SVA showed significantly better resolution in the temporal visual field compared with the nasal visual field at eccentricities 20° and beyond. The mean difference in acuity at 20° was approximately 0.2 LogMAR and at 30°, 0.3 LogMAR. The difference between the thresholds for DVA showed a similar naso-temporal asymmetry; the reduction in DVA paralleling the decrease in SVA for eccentricities 10° and beyond.  No significant differences were observed between averaged results of SVA and DVA for the eccentricities tested in this study.

 

Conclusions

The results of this study confirm previous research conducted by Frisén (1987) showing better resolution for static stimuli presented in the temporal visual field compared to the nasal visual field. We have found that this is also true for DVA.

Place, publisher, year, edition, pages
2011.
Series
Journal of Modern Optics
National Category
Ophthalmology
Research subject
Natural Science, Optometry
Identifiers
URN: urn:nbn:se:lnu:diva-10203OAI: oai:DiVA.org:lnu-10203DiVA: diva2:389149
Conference
EOS Topical Meeting: 5th European Meeting on Visual and Physiological Optics (EMVPO), 22 August 2010 - 24 August 2010, Stockholm, Sweden
Available from: 2011-01-18 Created: 2011-01-18 Last updated: 2017-02-17Bibliographically approved

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  • apa
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