Basic lenses mean that if the prescription are +/-2 -ish, you wont't need the thinned ones.
Remember that thinned lenses are more lightweight that the basic.
However, if you wish to have only the best, we advise you to opt for the 1x or 2x thinned lenses.
If the prescription is more that +/- 4 -ish, we suggest you opt for the 2x thinned lenses.
If you have any further questions, please hit us up via e-mail, Messenger chat or give us a call!