Lets say a Pt normally has an add power of +2.00 for a working distance of 16" but wants his working distance to be at 20" instead of 16" and he is wearining a PAL. (you have no idea where on his lenses he is normally looking...full strength of add power or just above that or in the intermediate) What's YOUR best practice for determining add power for working distances farther away than the norm in a PAL wearer? okay go....
Bookmarks