Roger wrote:
a grain of salt. BTW, for those who are interested in the EyeOnePros, I was told that if they are held about 5 cm off the screen, a) they won't exhibit any thermal drift whatsoever and b) the readings will not be significantly different from those obtained by contact measurements.
Interesting - I've certainly wondered whether contact with a warm display will exacerbate drift. Graeme Gill.