From: Marc Bernatchez Subject: Re: HUMAN-FACTORS: Children, VR, and home entertainment Date: Fri, 15 Nov 1996 13:16:22 -0500 Sarah Dobbin wrote: > > Twolfe (bonsai@nfinity.com) wrote: > > > You can always say that something is almost good enough, but there is > > no comparison between real stereoscopic viewing and simulations that > > use mono images. It's not so much in the stereoscopic vs monoscopic thing than to the real life stereoscopy vs the _simulated_ stereoscopy found in any stereoscopic visualisation device such as the HMDs. See the small E-mail interview I gave to someone at this address: http://www.imaginative.com/VResources/vr_revs/vr_revs1.html#The hardware corner > Terry, what about the fact that stereoscopic viewing can cause "blurring" > when viewing virtual objects at close range? I have done some reading > indicating that this factor detracted from the "realness" of virtual > environments. Any comments? Quite true Sarah. This is yet again related to the fact the the HMDs can't recreate a real life stereoscopic situation. You can read a lot about it in my report called "stereoscopy, principles and applications " also found on our site VResources. In short, it has to do with the fact that you build a stereoscopic scene from two 2D flat images. If the 3D objects you are trying to show in the device are too far from the "virtual image plane" distance, you will get that kind of blurring. Like I state in the interview I pointed out above, it may be of real concern if young kids use HMDs for long period of time (1 hour or more non stop by example) repeatedly. Their visual system is still growing so it is possible to imagine that it could change the course of evolution of their eyes and thus, make them tecnological visually accuity(accommodation) impared children. There is not much research and proof that this could happen but it's preferable to consider it possible than wait and be surprized later. Regards Marc Bernatchez | E-mail: mbernat@gel.ulaval.ca C.O.P.L. (local plt-00307) |============================================ Dep. Genie electrique | http://www.gel.ulaval.ca/~mbernat Universite LAVAL | http://www.imaginative.com/VResources Quebec, Canada |============================================ G1K 7P4 | Virtual Reality is the future of computers ==========================================================================