Hello there, i want to know who exactly uses Cross Cylinder Transposition. The only conjecture comes to mind is either lab-tech, an ophthlamologist, and maybe optometrist.
Even though i am an a apprentice optician i have lots of use with flat transposition since i can evaluate which eye defect a patient has, and with toric transposition its has most of use in surfacing the lens itself and then the lab will send it(the lens) to the optician. Furthermore, in theory i know and understand the Cross Cylinder Transposition but not in practice in the business sphere.

Any sort and kind of feedback welcomed