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From: clarke@utcsri.UUCP (Jim Clarke)
Newsgroups: net.med,net.info-terms
Subject: Re: VDT's and eyes.
Message-ID: <1771@utcsri.UUCP>
Date: Thu, 12-Dec-85 16:18:38 EST
Article-I.D.: utcsri.1771
Posted: Thu Dec 12 16:18:38 1985
Date-Received: Thu, 12-Dec-85 16:43:06 EST
References: <341@weitek.UUCP>
Reply-To: clarke@utcsri.UUCP (Jim Clarke)
Distribution: net
Organization: CSRI, University of Toronto
Lines: 26
Keywords: race lights
Summary: 

In article <341@weitek.UUCP> mmm@weitek.UUCP (Mark Thorson) writes:
>
>.............................................................................
>
>After a few times, you will be able to track the moving dots without the aid
>of your finger.  The interesting part is the difficulty in making the dots
>go from right to left.  I can see the dots move that direction when I use my
>finger, but not otherwise.  I suppose this is due to developing left-to-right
>eye muscle coordination for reading.

I find that I can get the dots in phase without finger aid equally easily
R to L and L to R.  This may be because I have misspent many hours rotating
my eyes in order to see whether distant lights are flourescent or incandescent
(incandescent ones don't visibly turn off each cycle) and to find out which way
TV sets scan.  The fact that I have no such difficulty suggests that Mark's
explanation may well be correct, I think.

(More recently, this trick has turned out to be useful for amusing children,
so it's not totally wasted.  However, it disgusts most adults.  I wish I could
see it.)

-- 

Jim Clarke -- Dept. of Computer Science, Univ. of Toronto, Canada M5S 1A4
              (416) 978-4058
{allegra,cornell,decvax,ihnp4,linus,utzoo}!utcsri!clarke