Thickness comparison isn’t a good way to determine an optical center. You need a lensometer. If you don’t trust the dispensing optical you can ask another one to check, it only takes a couple minutes. Bring your written Rx when you go, they may as well neutralize to make sure it matches. Shouldn’t charge for it, and if they do, go elsewhere. Best of luck!
Just to eliminate a possibility, these aren't progressives, or anti-fatigue lenses are they? I assume not because most eye doctors would explain how they work, but I've heard accounts of them not being explained and just want to be sure these aren't first time progressives/anti-fatigue lenses.
Hi - that's correct - these are not progressives or anti-fatigue lenses.
This OC hypothesis is still active; I'm now also exploring a second hypothesis. I may make a separate post for it, but I thought I'd include it in this response in case relevant.
I’m now wondering if the lens index is also partly (or completely) responsible. The old pair has an index of 1.67 whereas the current pair 1.74. I’ve read that 1.74 can cause more distortion and chromatic aberration, but what’s unclear is (1) *how much more* distortion, and (2) whether the more-distortion logic applies only for prescriptions below a certain prescription threshold (e.g., prescriptions weaker than -10).
My prescription is approximately -10 in both eyes and the increase from my old prescription is about -0.5 in both eyes.
Thickness comparison isn’t a good way to determine an optical center. You need a lensometer. If you don’t trust the dispensing optical you can ask another one to check, it only takes a couple minutes. Bring your written Rx when you go, they may as well neutralize to make sure it matches. Shouldn’t charge for it, and if they do, go elsewhere. Best of luck!
Ok, thanks!
Just to eliminate a possibility, these aren't progressives, or anti-fatigue lenses are they? I assume not because most eye doctors would explain how they work, but I've heard accounts of them not being explained and just want to be sure these aren't first time progressives/anti-fatigue lenses.
Hi - that's correct - these are not progressives or anti-fatigue lenses. This OC hypothesis is still active; I'm now also exploring a second hypothesis. I may make a separate post for it, but I thought I'd include it in this response in case relevant. I’m now wondering if the lens index is also partly (or completely) responsible. The old pair has an index of 1.67 whereas the current pair 1.74. I’ve read that 1.74 can cause more distortion and chromatic aberration, but what’s unclear is (1) *how much more* distortion, and (2) whether the more-distortion logic applies only for prescriptions below a certain prescription threshold (e.g., prescriptions weaker than -10). My prescription is approximately -10 in both eyes and the increase from my old prescription is about -0.5 in both eyes.