Computer Monitor Flicker Found To Be One Migraineur's Trigger

I just received this email from a fellow migraineur and thought it would be helpful for many of you:

Hi,

Thanks for your interesting site.

My migraines almost always manifest as dizzy spells. I had them for
over 30 years before a very smart PT figured this out.

Reading your post on computers as trigger prompeted me to write. One
trigger for me is flickering light. Many older computer monitors, not
flat screens, flicker at low frequencies and have caused me a great
deal of misery. When I change to a flat screen, no more problem.

Many newer CRT (TV screen type) monitors permit adjustment of the scan
rate and higher frequencies don't seem to produce such an annoying
flicker.

Certain florescent lights, maybe old tubes that are going bad, also
have been triggers for me. The two combined, old monitor where I can't
adjust the scan rate plus lousy florescents can be a nightmare. I've
had some help wearing a cap with a brim to block out some of the
flicker from overhead.

Best regards,
Tom Noll