Interesting article about precision-tinted lenses to reduce hyperactivity in the visual cortex of migraine sufferers:
http://scienceblog.com/45514/precision-tinted-lenses-offer-real-migraine-relief/ And the link to the full scientific article:
http://cep.sagepub.com/content/early/2011/05/20/0333102411409076.full.pdf+html(free for a limited time)
Certain stripes and zigzag patterns, as reported here, are certainly a trigger for me, so it's nice to see some progress in understanding this.