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H.P. Apple, J.M. Miller, E.M. Harvey, D.C. Apple; Child Response to an Electronic Vision Occluder for Acuity Testing . Invest. Ophthalmol. Vis. Sci. 2006;47(13):3161.
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© ARVO (1962-2015); The Authors (2016-present)
To evaluate a novel electronic shutter (AutOccluder) that permits rapid, complete monocular occlusion of vision in children for use in developing a visual acuity test that eliminates the order effect by interleaving presentations between eyes. This human factors study is aimed at determining if normal children will tolerate intermittent occlusion while watching a 60 second cartoon video.
The AutOccluder is similar in appearance to a ViewMasterTM, and utilizes LCD shutters developed for welders’ hoods as well as an ultrasound system to monitor the child’s head position. A child peers through the AutOccluder, which is mounted at eye level on an adjustable floor stand. The shutters silently switch on/off in less than 0.1 second and have sufficient optical density to achieve occlusion. A laptop controls the shutters, monitors the child’s head position, and communicates wirelessly with a second laptop programmed to display visual acuity optotype stimuli and fixation stimuli (videos, etc). We evaluated the child’s response to viewing a 60 second cartoon segment while the shutters went through a preprogrammed cycle. Occlusion alternated between a test sequence of No Occlusion (NO), Right Eye Occlusion (REO), NO, Left Eye Occlusion (LEO), NO, and a sequence of NO, LEO, NO, REO, NO. Changes occurred every 10 seconds. Twenty–four second and third grade students who were participants in a vision screening program that included visual acuity testing and autorefraction participated in this study.
All children complied with the task. No change in ultrasound monitored head position was noted during testing, suggesting that no children demonstrated a startle response when monocular occlusion occurred.. When asked about the experience, most talked about movie content. Two children reported an awareness that the shutters were operating.
This exploratory human factors work suggests that children will tolerate alternating monocular occlusion using this system. Future work will involve a handheld version and use of visual acuity tests.
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