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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