So called horn-rimmed glasses seem to be getting popular again. Is it safe to assume that these glasses are all vegan and only made out of plastic nowadays, or are some producers still using actual horn?
No it is not safe to assume they are plastic. Though I think price might be a good indicator.
Many designer glasses are produced in their thousands, but RIGARDS’s are made in their ones. RIGARDS frames are constructed of horn
There are others, but that answers your question.