No piercings, no tattoos, no lighting and no windows – remember I have an IR camera and it shows the environment with 0 light-sources so it isn’t that either. I have tried improving calibration 20 times now and it doesn’t improve. It works for a moment and gradually gets worse then can randomly get better and then it can be inches off again.
I have one light above my desk which I use when working with electronics. I have tried Tobii with and without this light which uses a dimmable LED bulb – there is no difference.