I recommend an eyelash curler.

I bought a Shiseido eyelash curler and have been using it constantly. I have slightly round eyes, and the curvature seems to fit me well. If I use it with the Etude eyelash fixer, it keeps the curl super tight all day long.

You can use it like new again just by replacing the rubber after use.

Even if a product is really famous and good, I think the best eyelash curler is one that fits the curvature well. Just so you know.