We have noticed for years that when we process a plus powered PAL, with a small B and a distance AOC of 12 or less that some of the plus power "creeps" up into the distance by an 1/8 or so. We have never had any offices or their patients complain but it is on all platforms. We have seen it on Zeiss, Shamir, IOT, and Seiko. I have a thought in my mind why it happens but does someone have a better scientific reason? Thanks