Yeah, I mean there are glasses that already exist that are designed to be less obvious they have cameras on them, but they aren't sold en masse to the general public that way. You can't avoid it. And modding for illicit purposes is always going to be an issue with any technology. But the majority of people don't have those skills and it will be more obvious to people once they know what to look for, if the light is removed or covered up. At least it would create a socially awkward situation for the majority, just like not aiming your phone camera around inside a changing room isn't a major issue because people know where the camera is. Knowing an individual pair of glasses has a camera isn't as easy as knowing all phones have one, so more of an indicator is needed. Of course there are still people who film in changing rooms with their phones, but it dissuades the casual from creeps doing it.