Threshold vision in amblyopia: Orientation and phase

Hess, Robert & Malin, Sam (2003) Threshold vision in amblyopia: Orientation and phase. Investigative Ophthalmology and Visual Science, 44(11), pp. 4762-4771.

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Abstract

Purpose

  • The visual deficit in amblyopia involves both elevated contrast thresholds and distorted suprathreshold percepts at high spatial frequencies. It is currently unclear whether these two anomalies are part of the same neural disturbance or whether they reflect different neural dysfunction.

Methods

  • The quality of the spatial percepts in amblyopia was assessed at detection threshold. The ability of amblyopes to discriminate the orientation and local spatial phase of well-localized spatial stimuli was measured at the detection threshold. Measurements were made as a function of spatial frequency.

Results

  • Performance seemed normal for orientation discrimination, even at high spatial frequencies, but, in some cases, it was disturbed in phase discrimination.

Conclusions

  • A different explanation and neural basis is needed to encompass both threshold and suprathreshold spatial deficits in amblyopia.

Impact and interest:

9 citations in Scopus
8 citations in Web of Science®
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Full-text downloads:

3 since deposited on 17 Jun 2009
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ID Code: 21783
Item Type: Journal Article
Refereed: Yes
DOI: 10.1167/iovs.03-0259
ISSN: 0146-0404
Divisions: Current > Research Centres > Centre for Health Research
Current > QUT Faculties and Divisions > Faculty of Health
Copyright Owner: 2003 Association for Research in Vision and Ophthalmology
Deposited On: 17 Jun 2009 12:57
Last Modified: 08 Dec 2016 05:05

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