Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/5/84; site terak.UUCP Path: utzoo!linus!decvax!genrad!panda!talcott!harvard!seismo!hao!noao!terak!doug From: doug@terak.UUCP (Doug Pardee) Newsgroups: net.graphics Subject: Re: Stereo Picture TV Message-ID: <642@terak.UUCP> Date: Fri, 12-Jul-85 12:06:00 EDT Article-I.D.: terak.642 Posted: Fri Jul 12 12:06:00 1985 Date-Received: Mon, 15-Jul-85 02:10:24 EDT References: <8794@ucbvax.ARPA> <5760@utzoo.UUCP> Organization: Terak Corporation, Scottsdale, AZ, USA Lines: 16 > The difficulty is that it requires viewers to > vary the convergence of their eyes (which is a function of how near the > objects appear to be) independently of the focus of the eyes (which is > a function of how far away the light-emitting screen is). Most people > are not used to this, and I am told that it gets uncomfortable after a > while. I wonder if eyestrain only results from focussing _closer_ than the convergence point. When I worked on a flight simulator, we had what is called "infinity optics", a filter for the CRTs which blocked 97% of the light, allowing only collimated light to pass through. The CRTs (and thus the point the eyes had to converge at) were located about 10 feet from the pilot. -- Doug Pardee -- Terak Corp. -- !{ihnp4,seismo,decvax}!noao!terak!doug ^^^^^--- soon to be CalComp