If you don't see a difference, you are already very close to the optimal correction and a subtle change in either direction is unnecessary. They will still go ahead and try fine-tuning the prescription and when you tell them that A and B are the same, they can fall back when they add another correction. A and B might currently be the same, but if you add C, A+C could be better than B+C.
You know, it makes me wonder how that works. Because most of the time, they get the prescription right, even though, for the most part, we only guess which one feels right to us, even though, to us, one and two look practically the same.
I think part of the image processing is done subconsciously and so we can pick up the minute differences in image quality by feel, even when we can't say what exactly is different.
That makes sense. Our subconscious is better at picking up the small details than our conscious mind, because it takes more effort for us to think about it. That's why they say "go with your gut" because our brains calculate things subconsciously. It's why we can do things without thinking about it.
If it isn't obvious, you're done. The weaker of the 2 lenses is right for you.
Me: One?
Optometrist: Wrong! How dare you! Get out of my sight!
Get out of my "sight" lol
Where I'm from, optometrists always ask "one, two, or are both the same?" I've never had any issue with that.
I hate when you get it wrong and they poke your eyeball.
