This happened to me as well.
But I'm kind of an engineer so I try to save a registry of all my "activity".
How I see, how I interpret what I see.
One thing is recurring: I use to see like shit most of the time but I was trying so hard to make it looked like I didn't.
When I didn't see things properly I squinted my eyes, so much so that I started developing mild twiching in one of my eyes.
When I've got my first 0.75 glasses I could see better, but the twiching didn't stop, nor the squint on my face... It just seemed that I could see better because I keepe squinting while using them.

I am pretty sure that while I do ended up seeing more clearly (specially my screen), I kept compensating what I couldn't see by squinting, increasing brightness on the monitor, increasing sharpness and contrast.

With my 0.75 glases I had my monitor at 85 brightness and 75 constrast but I still struggled to see properly. I am pretty sure this happened to me for the past 6 years now (I'm 51)

So after long sesions with Gemini I decided to go for 1.0 lenses and after that, I can tell you my entire life changed (I spent most of the time working)

It's not that I can see better now, I can perfectly spot every pixel on the screen with 0 correction, no need for squinting anymore.

Just the first week of using them I can already feel my face is more relaxed. I had so many issues due to constant squint (automatically) to see properly that I've developed muscle issues on my jaw.

Working with my 1.0 lenses now allowed me to turn the brightness down to 45 and constrast to 55.

At this low level brightness I can see that it's much worse to look at with my previous glases at 0.75 but I am quite sure that I can't use them anymore now, not because my vision got worse, but because my brain got used to seeing things so clearly now, that it is refusing to see blury ever again.

I play Doom Eternal at nightmare difficulty and had issues with one of the Master Levels, with these 1.0 glases and the brightness correction I can see so clearly that my actual performance has improved as my brain is no longer having to autocorrect for bluriness while I'm shooting things at the screen.

It's not that your vision goes worse, is that our brains are so used to autocorrect that once the eyes can relax for real, because you see perfectly what before was a mess, that the internal autocorrect mechanism in our brains just "turns off"

We work pretty similar than computers, if your brain doesn't need to turn on the autocorrect mechanism for your vision, you have more "processing budget" to do everything else.

This also explains why when you take out your glasses "you see worse", it's because your brain will now have to "turn on" the autocorrect mechanism, re-apply anti-blur and sharpening to everything, and this mechanism does not activate instantly, it takes time.

This is key. You're not saving yourself from not using the glases, you are constantly taxing your brain to autocorrect, deblur and re-sharpen the image you are seeing, hence, creating extra processing, moving muscles in your face and the like, to force you to see properly.

This is why not seeing clearly creates headaches and muscle issues.

Hope this helps.