glasses-separator

glasses-separator is a variable defined in `glasses.el'.
Its value is

"_"

Documentation:
String to be displayed as a visual separator in identifiers.
It is used both for adding missing separators and for replacing separators
defined by `glasses-original-separator'. If you don't want to add missing
separators, set `glasses-separator' to an empty string. If you don't want to
replace existent separators, set `glasses-original-separator' to an empty
string.

You can customize this variable.