Anyone know of videos available to explain low vision web accessibility issues?

Is anyone aware of any videos in existence that explain issues
or barriers to accessing web or e-resources  that people with low 
vision experience?

We've developed a couple of videos intended to illustrate issues that 
blind web users
face:
http://www.doit.wisc.edu/accessibility/video/index.asp
"Introduction to the Screen Reader" and
"Screen Readers and the Web"

  and are looking at developing a similar resource that looks at low 
vision issues,
but do not want to replicate what may already be in existence.

thanks in advance,
-- 
==============================

Alice Anderson
Technology Accessibility Program (TAP)
Division of Information Technology (DoIT)
http://www.doit.wisc.edu/accessibility/
University of Wisconsin-Madison
1210 West Dayton Street
Madison, WI 53706
Telephone: 608.262.2129

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"I always wondered why somebody doesn't do
something about that.  Then I realized I was
somebody."
(Lily Tomlin)