I have a prescription for my glasses. I should be getting bifocals, but I can’t afford them. The last time, I managed to get two different types - one with my distance prescription and one for close-up. I lost my close-up glasses, and I don’t know how to order a replacement pair from Zenni Optical. Here’s my prescription:
(SPH) (CYL) Axis NV-ADD OD - Right -3.50 -1.00 60 +2.00 OS - Left -3.25 -1.00 75 PD 69
Do I subtract the NV-ADD number from the SPH value? That would make the right eye SPH -1.50 and the left -1.25?
Yes, I know I should buy from my eye professional, but I just don’t have the money. Please help.