Originally Posted by
Zing
I think you are confusing your corrective lens power with your vision measurement. Yes, a lens power of -8 is ridiculously high. The negative number simply means you are nearsighted. Anything over -6 is pretty extreme.
Your vision measurement will always be 20/something. 20/400 essentially means you can only read the huge "E" at the top of an eye chart. I don't know what my measurement is without my contacts, but with them, I am at 20/15, which means I can see at 20 feet what others can only see at 15. My lens powers are just over -5.