Dude, eyeglasses won't make your eyes small. Your eyes will become smaller if you often squint them. Squint the eyes can be a bad habit, but it often happens among people who have some vision problems.
I have mild myopia. So I am also a current eyeglasses user. I only heard that our eyes will protrude after we wear eyeglasses for many years. My math teacher is a beauty. But she wears eyeglasses for more than ten years. She has high prescription as you do. I noticed that she often squint her eyes after she take off her eyeglasses. But her eyes are not small if she doesn't squint them.
Well, I am a current eyeglasses user. After taking off my eyeglasses I can't see things clearly, but I won't squint my eyes. I will keep my eyes open widely. So my eyes look bigger. You can have a try. Good luck!
Your eyes won't become smaller after wearing 500 power lenses. If you still have doubts, you can try contacts. They won't make your eyes protrude as time passes and won't make your eyes smaller. But it is easy to get an eye infection if you don't pay attention to eye hygiene. Hope this helped!
Your eyes will be smaller if you don't open your eyes wide. Seriously, glasses won't make your eyes smaller. I think that if you are used to opening your eyes wide, you'll find that your eyes are always big.