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From: mmm@weitek.UUCP (Mark Thorson)
Newsgroups: net.med,net.info-terms
Subject: VDT's and eyes.
Message-ID: <341@weitek.UUCP>
Date: Tue, 10-Dec-85 15:10:23 EST
Article-I.D.: weitek.341
Posted: Tue Dec 10 15:10:23 1985
Date-Received: Thu, 12-Dec-85 05:25:47 EST
Organization: Weitek Corp. Sunnyvale Ca.
Lines: 16
Keywords: race lights
Xref: watmath net.med:2946 net.info-terms:740

Here's an interesting phenomenon.  Run your finger along the line of dots
from left to right.  Do it slowly, so that it takes about two seconds for your
finger to cross the screen.  Track your fingertip with your eyes.  You should
be able to see a "race lights" effect, where you see the dots moving.

.............................................................................

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.

Mark Thorson  (...!cae780!weitek!mmm)

PS No flames from folks on printing terminals, please.