Just a quick note about the i-Terminal we use to accurately measure pupillary distance, progressive segment height and optical center placement: I recently wore my old progressives (made w/o i-Terminal) briefly. They are the same Rx as my new ones. They were awful! They were measured the old fashioned way (by hand) at my old office. At the time I thought they were OK, but now I'm spoiled. The reading portion was in slightly different positions in the right and left eyes, which made clear reading difficult. I had to "find the spot" and it was not all that easy. NOT SO in my new ones made with the Zeiss i-Terminal. I'll never go back! You shouldn't, either!