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Re: guideline 7.1 about screen flickering

From: Jonathan Chetwynd <j.chetwynd@btinternet.com>
Date: Thu, 26 Jul 2001 22:40:10 +0100
Message-ID: <040c01c1161b$8c45d780$f28e7bd5@btopenworld.com>
To: "Terrie King" <tking@ucp.org>, <w3c-wai-ig@w3.org>
This seems to have generated a huge amount of interest...
People with LDD have about 10x the frequency of epileptics, compared to the
general population.
None the less I don't have so much experience.

One student regularly(twice) has minor fits whilst working at a desktop.
Sufficiently that I don't do so much work with her...
She has fits regularly in any case, in case you thought I'm being
irresponsible, its called quality of life.

Her fits appear to be related to overwork, ie say about 30 minutes
I would not say they related to a particular image, more a state of mind
induced by concentration, and quite possibly triggered by the monitor.

Not a lot to go on, but many(a high proportion) of my students are
epileptic, and over 6 years this is the only student I know of who has had a
fit whilst at a workstation.

I feel the graphic in question is fine. almost all animations will have a
frequency within the given range, that is after all the range in which our
eyes perceive motion.

jonathan chetwynd
IT teacher (LDD)
http://www.peepo.com         "The first and still the best picture directory
on the web"
Received on Thursday, 26 July 2001 18:00:47 UTC

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