Dear sir(s),I have some problem to understand the below prescription:
Re- +4.5/-2.5*155 & dcntr -2.90 in//4.90 up
Le-+4.75/-3.25*20 & dcntr-3.40 in//4.90 up
BE ADD-2.00
BE 2.37 ∆ @270
It's a ff progressive lens
I,m not able to understand how 2.37 ∆ prism comes.