As you hear from Essilor(Vision Printing System), Ipseo designed bese on individual habit. One is eye mover and the opther is head mover.
I regard the concept is as a most advanced design concept in PALs. In addition, I know head mover is better adapt to PALs than eye mover. However, unfortunately, there is no method to determine whether he/she is eye mover or head mover without use special equipment such as VPS.
If you have any method or skill regarding above matter, Please let me know.
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