If you go to steamapps\workshop\content\108600\2698765788\mods\MyopiaHyperopia\media\lua\shared
and open VisionImpairmentTrait.lua with any text editor, you can change the -2's to whatever you want. Personally, I'd go with -6, but you might want to make it -4 or something if you're deciding to start with glasses.
Do not change the number from a negative to a positive, its backwards for some reason lmao