Seriously?
Do sighted people really need to look at the paper to see if it's clean?
Or maybe that's the reason you people put on lights in the bathroom even in your own house?
Try. Go in your bathroom at nighttime and don't turn on the lights. Do your business, wipe. Should be pretty easy as your muscle memory should tell you where the pot is, where the paper is etc.
If in doubt, use more paper.
And trust your nose. (That's more relevant if you have the lady parts. Iron stinks)

Jesus Christ. Sometimes I don't know why I bother with the Internet.

Wait... Sighties look at the toilet paper they just wiped with?! Eww!

You don't need to sees gay you are doing because it is all feeling before, if you even look at it.

Also you don't bend down and check if you got everything anyway.