u/GloudPlay

Yup, the topic have been going on forever, I'm just asking because my search got no results.

I'm currently using a glasses with measurements of -7.25 and -8.25. Let says the shop I want to buy it from have an option for -7.25 to -8.00 and -8.25 to -9.00. Obviously, I have to go with the second option. The thing here is the price difference is almost 25% more for the latter option.

Is it okay for me to just make my prescription lens as I've described before or I have buy the exact measurement of my glasses prescription? Does the difference noticeable if i buy the difference prescription lens? Thank you in advance.