Hopefully your vision will improve. Please dont do this anymore. It is beyond dangerous.
Here is the deal....You are lucky to still be alive. There are a couple 16 yr old girls from my area who decided to do this, now 1 is dead and the other spent time in ICU with seizures. They found the girl face down in a field after she went into the ditch. They had done this before so it can and WILL happen. You and your friend are not exempt. Time to change friends and stop this deadly activity.