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Contrast sensitivity in eyes with central scotoma: effect of stimulus drift
Linnaeus University, Faculty of Health and Life Sciences, Department of Medicine and Optometry.ORCID iD: 0000-0002-8365-0601
Royal Institute of Technology.
Royal Institute of Technology.
2018 (English)In: Optometry and Vision Science, ISSN 1040-5488, E-ISSN 1538-9235, Vol. 95, no 4, p. 354-361Article in journal (Refereed) Published
Abstract [en]

Significance

In the field of visual rehabilitation of patients with central visual field loss, knowledge on how peripheral visual function can be improved is essential. This study presents measurements of peripheral dynamic contrast sensitivity (with optical correction) for off-axis viewing angles in subjects with central visual field loss.

Purpose

Subjects with central visual field loss (CFL) rely on a peripheral preferred retinal locus (PRL) for many visual tasks. It is therefore important to ascertain that contrast sensitivity (CS) is maximized in the PRL. This study evaluates the effect of stimulus motion, in combination with optical correction, on CS in subjects with CFL.

Methods

The off-axis refractive errors in the PRL of five young CFL subjects were measured with a COAS open-view Hartmann-Shack aberrometer. Low-contrast (25% and 10%) and high-contrast resolution acuity for stationary gratings was assessed with and without optical correction. High-contrast resolution was also measured for gratings drifting at 7.5 Hz (within a fixed Gaussian window). Furthermore, resolution CS was evaluated for both stationary and moving gratings with optical correction for a total of 2-3 spatial frequencies per subject.

Results

High-contrast resolution acuity was relatively insensitive to stimulus drift motion of 7.5 Hz, whereas CS for gratings of 0.5 cycles per degree improved with drift for all subjects. Furthermore, both high- and low-contrast static resolution improved with optical correction.

Conclusions

Just as for heathy eyes, stimulus motion of 7.5 Hz enhances CS for gratings of low spatial frequency also in the PRL of eyes with CFL. Concurrently, high contrast resolution is unaffected by the 7.5 Hz drift, but improves with off-axis optical correction. This highlights the importance of providing optimal refractive correction for subjects with CFL, and that stimulus motion can be used to further enhance CS at low spatial frequencies.

Place, publisher, year, edition, pages
Wolters Kluwer, 2018. Vol. 95, no 4, p. 354-361
Keyword [en]
Central scotoma, Central visual field loss, Contrast sensitivity, Off-axis refractive errors, Peripheral vision, Spatiotemporal contrast sensitivity, Stimulus drift, Preferred retinal locus
National Category
Other Medical Sciences not elsewhere specified
Research subject
Natural Science, Optometry
Identifiers
URN: urn:nbn:se:lnu:diva-71797DOI: 10.1097/OPX.0000000000001195PubMedID: 29561506OAI: oai:DiVA.org:lnu-71797DiVA, id: diva2:1193080
Funder
Swedish Research Council, 621-2011-4094
Note

This research was also supported by “Berit and Carl-Johan Wettergrens Foundation.”

Available from: 2018-03-26 Created: 2018-03-26 Last updated: 2018-05-09Bibliographically approved

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Lewis, Peter

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