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- W1121774841 abstract "Purpose: The accommodation response has recently been shown to improve visual acuity (VA) in the presence of astigmatism in some individuals. This improvement could potentially result from the accommodation system exhibiting a cyclic tracking response. This type of response would allow the integration of target features over time, resulting in an improvement in VA. In this study we measure VA in simulated astigmatic blur conditions, with the magnitude of astigmatic blur being temporally modulated over a range of astigmatic blur intervals. Improvement of VA with increased range of astigmatic blur would support the integration of visual information over time hypothesis.Methods: Three fully corrected subjects participated in a 3-Alternative Force Choice method of constant stimuli paradigm where they were asked to identify one of three randomly chosen letters (K, R or X). The stimuli (Arial, font size 18) were subjected to varying amounts of Gaussian blur along the horizontal and vertical meridian and presented at a distance of 1.3 m. On any trial, the stimuli were randomly presented to the subjects at one of six astigmatic blur intervals. Each blur interval revolved at a temporal frequency of 2 Hz around the circle of least confusion with the smallest interval presenting the stimuli at the circle of least confusion and the largest oscillating the stimuli across the full interval, i.e. from the most horizontally to vertically blurred meridian.Results: From the resulting psychometric functions it was shown that all subjects exhibit a progressive improvement in letter recognition with increasing astigmatic blur interval.Conclusions: The improvement of VA with increased astigmatic blur interval strengthens the hypothesis that visual information can be integrated over a period of time." @default.
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- W1121774841 date "2005-05-01" @default.
- W1121774841 modified "2023-09-27" @default.
- W1121774841 title "Temporal Integration of Astigmatic Blur Information" @default.
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