Short Term Effect of Monocular Wearable Device on Accommodation

Abstract

Purpose: This study is to investigate various problems of wearing google glass, and to compare an accommodative response of short term usage of a computer, tablet PC, and google glass. Methods: We measured accommodative responses of thirty university students (8 males and 22 females) who presented normal binocular function (accommodation and vergence). To compare accommodative response, subjects viewed 10 min of computer, tablet PC, google glass in order respectively, after distance refractive error was measured. Accommodative response was measured by using open-view auto-refractometer (Nvision-K5001, shin-nippon, Japan). Results: When accommodative stimulation was different, each accommodative response was 1.13±0.33D on the right eye and 1.15±0.35D on the left eye, and there is no significant correlation between right and left. The average accommodative response with left eye was 0.77±0.54D (computer), 1.42±0.45D(tablet PC) a nd 0 .2 9±0.18D (google glass) respectively. There was no significant correlation between computer and tablet PC. However, there were significant correlations between computer and google glass and between tablet PC and google glass (p<0.05). Conclusions: When google glass was used, the amount of accommodative response was small in quantity. This accommodative response was not enough to make spasm of accommodation or diplopia. Thus, much researches about accommodation are needed. Although the image of google glass is virtual image, a certain degree of accommodative response was induced. Therefore, wearers of google glass with presbyopia or high degree of hypermetropia can have difficulty on seeing the clearer image.