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Elie J. de Lestrange, Chris Dainty; Implication Of Awareness During Visual Stimulation By Aberrated Target. Invest. Ophthalmol. Vis. Sci. 2011;52(14):4771.
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Vision is a dynamic process and only partial information from the external world is integrated by the eye. We want to investigate what part the optical aberration may occupy in this selectivity and the involvement of attention and conscious processing, while perceiving manipulated image.
A photopic high contrast tumbling "E" visual acuity test, based on an adaptive psychophysical procedure, were measured in 2 normal subjects with undilated eyes, over a 5-mm pupil. Using an adaptive optics system, the eye aberrations were controlled in order to fit with three main optical patterns: ‘aberration-free’, ‘random pattern’, ‘natural aberration’, and looked through to a monochrome green OLED microdisplay. We tried to disrupt the voluntary processing of information, and in some part attention, by using the presentation of scattered random dots between trials occupying the all field of the display. One mask acted as a primer, placed before onset of the target and in a second series as an inhibitor, just after onset of the target. The third series of test consisted simply of a normal visual acuity task with a stimulus displayed during 0.5s.
The preliminary results show a change of VA by a factor of 0.15 with both masking methods. As a striking feature, it appears that the introduction of the inhibitory mask was systematically accompanied by a fall of the VA performance in the ‘natural aberration’ condition, while it rather improved the VA in the case of manipulated aberration and ‘free aberration’ state. The nature of the action of the second mask was less clear in regards of the data.
Masks have an impact on how well the subject can perform and may also have an effect on the development of processing of the information that can copy the way things are looked at dynamically. Our result seems to indicate that those masks are not equal in regards to all the aberration, and, in particular, may have an inhibitory effect only when the subject looking through its own optics. However, further examination will be required for more understanding.
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