Is false eyelashes a chatziza for a lady for the mikva?
L’chatchila they should be removed before she goes to the mikva, but b’dieved they aren’t a chatzitza. If however they are starting to fall off, and the way they look now is not enhancing her appearance then they must be removed, and if they weren’t a rov should be consulted.
Igros Moshe Y:D 3-62, Pischei Halacha 2 pg. 340.