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Visual Psychophysics / Physiological Optics - ARVO

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<strong>ARVO</strong> 2013 Annual Meeting Abstracts by Scientific Section/Group – <strong>Visual</strong> <strong>Psychophysics</strong> / <strong>Physiological</strong> <strong>Optics</strong>image processing using a Head Mounted Display (HMD), to locateand identify objects.Methods: We enrolled 12 patients with RP, complaining of nightblindness to various degrees, (23 to 81 years old, mean = 43; visualacuity (VA) = -0.1 to +0.5 logMAR, mean = +0.15; horizontal visualfield = 20° to 180°, mean = 52°). Dark-adaptation threshold wasassessed with Goldmann-Weekers adaptometer.We used a non-immersive HMD (Lumus, Israel; Essilor Int. andInstitut de la Vision, Paris) which provides a luminance-enhancedvideo image, displayed through transparent lenses.The experiment took place in a living room, including regularfurniture. Before starting the evaluation, the tested subject viewed thefurniture setting in photopic lighting condition (700 lux). Then, thesubject turned his back on the scene, and the experimenter placednine objects on various locations. Eventually lighting was abruptlyreduced to 3 lux, and the, subject was asked to identify all addedobjects as quickly as possible. Trials were repeated three times, withand without the HMD. Between two consecutive trials, objectlocations were changed, and the subject was exposed to photopiccondition during 5 minutes to prevent dark adaptation. The number ofobjects and the detection time were recorded.Results: To identify the presented objects, four of 12 patientsperformed better using the HMD than without it (F(1,54) = 8.05; p

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