The term "metaverse" has become a common word in recent years. This term, a virtual space on the Internet, is gaining importance in various fields in today's era of remarkable progress toward the fusion of virtual space and real space using digital science. The authors have been engaged in a project to develop educational applications using experiences in 3D virtual space with headset-type goggles. In this study, we investigated the physiological effects on the viewer by observing and analyzing the blink and discussed its applicability.
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