When I started this process I wanted to know where I actually stood. I had been wearing -2.75 contacts and -3.0 glasses for at least 5 years so I went to the eye doctor who increased my glasses to -3.25. I started with -1.75 differentials since i’d been wearing +1.25 computer glasses over my -2.75 contacts for a while and figured that would give me some blur. It didn’t. So I decreased them to -1.5. Still really no blur, but I wore them for about 6 weeks before ordering -2.25 normalized. With these I do get some blur. But seeing as I do like to wear contacts when doing certain activities, I ordered -2.25 dailies based on this article by @jakey https://endmyopia.org/convert-contact-lens-prescription-glasses-prescription/. No blur whatsoever. Checking Snellen, I can clearly read the 20/12 line! The good news is that I can use the lower strength and still see, but I can’t use them to get any kind of blur. But do I need -2.0 or -1.75? (Rhetorical question, not asking diopter advice!)
It is just so hard to know what strength glasses/contacts to order. I am happy to know that the 3.25 that I was prescribed was way overprescribed and I’m closer to not needing glasses than where I started, but it is such a trial and error process. I wish it were easier.