In fitting hearing aids, a hearing aid dispenser shall not take facial measurements or fit, adjust, or adapt lenses or spectacle frames, except that a hearing aid dispenser may replace the temple or temples of a person’s spectacle frames with a temple or temples incorporating hearing aid components.
Source:
Section 2538.13, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=BPC§ionNum=2538.13..