Not to offend anyone but I have not really had any favorable experiences with the permafocus bins that I have tried. Close focus is definitely an issue. Even with variation due to an individual's eye there still is an issue.
May I ask why you are interested in them as compared to just a regular focus model?
PABowhntr - I saw them in a magazine and I thought they might be quicker for scanning game.
I went to a sporting good store yesterday and looked through a pair of the 10 X 50's, and I now understand why some people like them and some do not. When you look through them, the binoculars magnify the image, but you use your eyes to focus on the object of interest. I think they would work for just quickly scanning objects for short periods of time, but if you really try to hold on an object and study it, it starts to strain the eyes a little bit. With my vision, I was not able to get a totally clear picture in the store, but I waslimited to reading a sign that wasmaybe 30 - 40yards away.