The effect of retinal image slip on peripheral visual acuity

Macedo, António Filipe,1976-UCL Institute of Ophthalmology, UK ; University of Minho, Portugal (författare)

Abstract Retinal image slip promoted by fixational eye movements prevents image fading in central vision. However, in the periphery a higher amount of movement is necessary to prevent this fading. We assessed the effect of different levels of retinal image slip in peripheral vision by measuring peripheral visual acuity (VA), with and without crowding, while modulating retinal image slip by using gaze-linked stimuli. Measurements were carried out at four isoeccentric positions at 5 and at 10 degrees eccentricity. Gaze position was monitored throughout using an infrared eyetracker. The target was presented for up to 500 msec, either with no retinal image slip, with reduced retinal slip, or with increased retinal image slip. Without crowding, peripheral visual acuity improved with increased retinal image slip compared with the other two conditions. In contrast to the previous result, under crowded conditions, peripheral visual acuity decreased markedly with increased retinal image slip. Therefore, the effects of increased retinal image slip are different for simple (noncrowded) and more complex (crowded) visual tasks. These results provide further evidence for the importance of fixation stability on complex visual tasks when using the peripheral retina.

Crossland, M. D.UCL Institute of Ophthalmology, UK (författare)
Rubin, G. S.UCL Institute of Ophthalmology, UK ; NIHR Faculty, UK (författare)
UCL Institute of Ophthalmology, UK ; University of Minho, PortugalUCL Institute of Ophthalmology, UK (creator_code:org_t)

Ingår i:Journal of Vision: Association for Research in Vision and Ophthalmology (ARVO)8:14, s. 1-111534-7362

Av författaren/redakt...: Macedo, António ...; Crossland, M. D.; Rubin, G. S.

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MEDICIN OCH HÄLSOVETENSKAP: MEDICIN OCH HÄLS ...; och Klinisk medicin; och Oftalmologi

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