The curler has a huge design flaw and, just like someone else described in a different review, it pinches your skin when you use it. The pinch happens on both sides of the curler (in the corner where the curler meets the metal part that comes from the handle) and it's sharp. It pinches your under eye when you try curling.
This has NOTHING to do with eye shape - the curler is just poorly designed and clearly not tested. It's not worth it even for free, mine for sure has a date with the trash to make sure I don't accidentally gash my skin trying to curl my lashes.