Testing of study participants who wore head-mounted display systems found that the glasses created a partial peripheral1 vision obstruction2, according to a study in the November 5 issue of JAMA. Interest in wearable head-mounted display systems for general consumers is increasing, with multiple models in production. However, their effect on vision is largely unknown. Peripheral visual field is a main component3 of vision and essential for daily activities such as driving, pedestrian safety, and sports. Conventional spectacle frames can reduce visual field, sometimes causing absolute blind spots, and head mounted devices have even more pronounced frames, according to background information in the article.Tsontcho Ianchulev, M.D., M.P.H., of the University of California, San Francisco, and colleagues compared performance on visual field tests with a head-mounted device vs regular eyewear to quantify their effect on visual function. Three healthy individuals with 20/20 best-corrected visual acuity4 and normal baseline visual fields were tested in April 2014. Participants used a wearable device , following manufacturers instructions, for a 60-minute acclimation5 period. Perimetric6 visual testing was conducted first with the device, followed by a control frame of similar color and temple width.In addition, to assess how the devices are worn by general consumers, photographs of people wearing the product and facing the camera, obtained from an Internet search, were analyzed7. Photographs were assessed for prism position relative to the pupil.Visual field testing demonstrated significant scotomas in all 3 participants while wearing the device, creating a clinically meaningful visual field obstruction in the upper right quadrant. Defects were induced by the 谷歌 Glass frame hardware design only and were not related to a distracting effect of software-related interference.
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1 peripheral adj.周围的，外围的 参考例句： We dealt with the peripheral aspects of a cosplayt reduction program.大家谈到了减少本钱计划的一些外围问题。 The hotel provides the clerk the service and the peripheral traveling consultation.旅舍提供票务服务和周围旅游咨询。
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