I ordered slightly undercorrected glasses (-2/-2.5 instead of -2.25/-2.75) exactly a year ago to try the same, and it did nothing for my myopia. I use the undercorrected glasses all the time, except when driving at night and when playing sports, and nothing has changed.
I still use them all the time because the cheap frame I chose turned out to be very comfortable, more than the expensive one from my regular glasses.
At first I had some hope because for the first days using the undercorrected glasses I would end up with a strong headache in the evening; when this passed I figured that maybe my eyes had begun adjusting. But every time I try the regular and undercorrected glasses side-by-side, I see noticeably better with the regular ones (I sometimes test this just by eyeballing something afar, or by reading a home-printed Snellen chart 3 meters away).
I figured some people have glass-induced myopia, and some people just have myopia.
Vision therapy doesn't work for everyone, it's quite a bit of effort. Under-correction is only one component, therapy should be designed in conjunction with lifestyle.
For liability reasons (e.g. driving) optometrists tend to err on the side of stronger rather than weaker, so most prescriptions are for distance activity. If you're spending many hours with screens that are at arms length or closer, then reducing a distance-driving prescription by 0.25 may not be enough to reach the "edge of blur" for closeup vision.
The https://endmyopia.org community has more info. If you don't have the time to learn about measurements and feedback testing, look for a local optometrist who endorses vision therapy and can work iteratively with you.
I ordered slightly undercorrected glasses (-2/-2.5 instead of -2.25/-2.75) exactly a year ago to try the same, and it did nothing for my myopia. I use the undercorrected glasses all the time, except when driving at night and when playing sports, and nothing has changed. I still use them all the time because the cheap frame I chose turned out to be very comfortable, more than the expensive one from my regular glasses.
At first I had some hope because for the first days using the undercorrected glasses I would end up with a strong headache in the evening; when this passed I figured that maybe my eyes had begun adjusting. But every time I try the regular and undercorrected glasses side-by-side, I see noticeably better with the regular ones (I sometimes test this just by eyeballing something afar, or by reading a home-printed Snellen chart 3 meters away).
I figured some people have glass-induced myopia, and some people just have myopia.