Smudge-proof brush pen eyeliner... I totally buy it every day.

I used the Clio brush pen eyeliner because they said it doesn't smudge, but I wonder if there's something wrong with my eyes... or what?

My eyeliner keeps smudging... It really smudges even when I don't do anything special.

It keeps smudging, so I only draw the tail without filling in the waterline. Can you recommend a smudge-proof brush-tip eyeliner?

I heard that pencil eyeliners smudge no matter what you use, so I haven't even tried them.