Hi Nigel, I have looked into this before and its not really an issue these days - refresh rates under 60Hz can be problematic, refresh rates between 3 and 30Hz can trigger a seizure. Anything around 60Hz and above shouldn't be problematic. Kind regards, John HodgsonStudy Needs Assessor Date: Fri, 12 Sep 2014 08:41:10 +0000 From: [log in to unmask] Subject: Refresh/Flicker rate PCs vs Macs To: [log in to unmask] Hello I am wondering if there is any empirical/medical evidence that the refresh/flicker rate from a PC screen can detrimentally affect someone with epilepsy; i.e. induce (to be party to) a seizure?(I think you can all see where I am going with this?) Open forum answers fine! Thanks Nigel Nigel J UttingDSA Needs Assessor