LCD monitors do not "really" use the refresh setting. You can set it,
and it will adjust the quality of the picture seen on older analog to
digital converted systems, but the refresh rate itself never changes on
an LCD. Here's a decent site to explain this in more detail:
Knowing that LCD's are digital, and have nothing to do with refresh
rates, and without knowing more details of your situation except for
what you've provided, I can only speculate on an answer. Here are some
ideas to investigate:
A. Environment... The lighting in the area could be part of the
problem, especially if they're fluorescent lights.
B. The quality of the LCD is poor and could be causing additional
strain on the students' eyes (size of print, text clarity, etc.). If
the LCD is a decent quality, you may have a bad video card.
Upgrade to a decent video card that is a true DVI card, and remove
any analog to digital converters.
C. Some kids just have problems with motion, and video in general,
whether it's on an older CRT, or a newer digital LCD.
I hope that helps, or at least gives you a few other areas to explore.
District Network Services Coordinator
South Burlington School District
Phone: (802) 652-7297
Fax: (802) 652-7013
E-Mail: [log in to unmask]
From: School Information Technology Discussion
[mailto:[log in to unmask]] On Behalf Of Eric Hall
Sent: Thursday, October 05, 2006 9:14 PM
To: [log in to unmask]
Subject: Monitor refresh rates & seizure disorders
I am curious if anyone else has had experience with this: we have a
of students with seizure disorders of one sort or another, and there are
concerns that computer monitors (particularly our new LCDs) are making
things more difficult for them - they may not be consciously aware of
screen refreshing, but it seems to have an effect (increased facial
Default settings on our CRTs are 60Hz, and I have been able to adjust
up to 100Hz. LCDs will not accept higher than 75Hz. Apparently this may
be high enough to avoid side effects when these students use computers.
Is anyone aware of filters or other options for these students? Any
experiences out there?
Washington West Supervisory Union
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