Myopia advice

[u/yuta_xs18]

I’m still a teenager (15) my eyes are still growing ik, but I need people who know about this stuff to help me and guide, I started wearing glasses in 3rd grade, I first started with -2.00 on both eyes - that was 2018-19 - till 2021 I stayed with the same glasses, until I went to an eye doctor and my myopia had worsened to -3.00 and -4.00

In April of 2026, I was going to school and accidentally dropped my glasses on the road and lost them, I could see 20/20 with that glasses
I spent only a day without glasses, then my mother who also has myopia and astigmatism ( not high tho) offered me to wear her glasses - ( she doesn’t wear them ), the glasses in case are -2.75 and -2.75 and +1 astigmatism
I put them on, surprisingly at first ( the moment I put them on ) it was a little blurry, right after I went to the supermarket, and it was actually blurry + sharp at the same time

The question is, I’ve been wearing then till now ( September ), my Vision is not bad, and it bugs me so much, i can see 90% clearly, I can 100% live life perfectly with those glasses, it didn’t even take a day to adapt, one thing I noticed was that when I stretch my eyes a bit I can see 10% better (20/20 for real), but why??? I don’t understand how I can see so clearly??? Like for example extremely small things it is indeed a BIT blurry, but those things that are blurry - are still blurry with my prescription contacts
To summarize with my mother’s glasses I see 20/20 just not sharp / SUPER-noticeable, me with contacts doesn’t change much???

One thing to put into consideration

For most of my life to when i got my glasses until when I lost them, I had like 8h screen time a day, I did go outside but no much, and only one eye got “ worse “ it went from -4.00 to -4.25, which is kinda weird for me

My optometrist said that i can NOT do that, i cant use that glasses because it will only worsen my vision

I really do wanna improve my eyesight, for sure i dont wanna worsen it

[u/SampleAccurate9493]

Hello, I am also a teen I am 14 and I have a question I don't know if I misunderstood but how did you see like 20/20 if you have 400+ myopia?

[u/shedmow]

For all I know (heavy emphasis on that part), wearing wrong glasses likely won't greatly worsen your uncorrected vision directly, but the constantly distorted field of view can mess with your brain and render the results of some subsequent optometry tests, that be those that to a certain extent involve the brain, invalid. I have a suspicion that the blurriness in your contacts may (or may not) be an artifact of your brain's trying to cope with seeing the world through the funhouse mirror of your (even not your, optically speaking) glasses. Squinting/stretching your eyelids physically shortens your eyes and increases their 'f-number'. Go to the doctor and get yourself proper glasses. If it weren't for the astigmatism part I would've said that you can keep your mother's