My 7 year old son started at a new school this year. At the beginning of the school year he complained of headaches that went away after a month so we didn't really investigate (he tells us now they never went away but just became a little less painful/frequent). After winter break he started complaining again and this time he said it was the Smartboard (essentially a projector/whiteboard combination) in some classes that gave them to him (these boards are being used more now). He also described what sounds like to me to be the rainbow effect. He also said that it was only certain projectors/Smartboards in some classes that cause this so I went to the school and to the projector, the ones that gave him headaches were DLP and the ones that didn't were LCD. The Smartboards were all using a UF55W projector which is identified as a short throw DLP but there isn't a whole lot of information out there (I assume it is made for use in Smartboards). I am still running a CRT projector (Barco 1209s) at home which causes him no issues either.
We have had his eyes tested for near/farsightness and he is fine but we are going to go to an ophthalmologist for a more in-depth test. We are also going to speak to the school once we know there is not some other underlying condition.
What I am looking for is does any one have any advice on ways to minimize DLP sensitivity? I have seen reducing the brightness and sitting further back as two suggestions, are there any others? If it matters the lights are on when the projectors are being used so I don't think brightness is an issue here.
Also please I don't want this thread to deteriorate into an DLP vs. whatever other technology thread.