I’m 19 With Myopic Astigmatism, My Perscription Is -4.25 Right Eye And -4.75 Left Eye. How Bad Is This?

That’s either legally blind or really close. I’ve never seen anyone over a 5.0 and they couldn’t see two inches in front of their face. Since you are 19 I’m going to say that it will probably get better with time and then it will level off. Just do things now to prevent it front getting worse like not reading in low light and things like that.