Thanks for your insight, Dave. By the way, how does one technically determine the hertz rate? Terrie ----- Original Message ----- From: "David Woolley" <david@djwhome.demon.co.uk> To: <w3c-wai-ig@w3.org> Sent: Wednesday, July 25, 2001 2:52 AM Subject: Re: guideline 7.1 about screen flickering > Charles wrote: > > > > I am not so sure. The thing moves in my viewer at the sort of rate that is > > potentially a problem (between 5 and 50 hertz, roughly) for people with > > The frame rate is 1/80ms, and there are four circuits in 30 frames, > so the complete sequence repeats at about 1.666 Hz, so I suspect it > may be too slow. > > > photosensitive epilepsy, and is distracting for people with concentration > > difficulties. I think if it is going to be fine it will be so on the basis > > However it is extremely distracting in the peripheral vision, so it > would fail on that point. > > Incidentally, it's not technically accurate, as a real primary radar would > have a fast leading edge and a slow exponential trailing edge, whereas > this picture has slow leading and trailing edges. >Received on Wednesday, 25 July 2001 17:43:37 GMT
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