scope:

Specifies minimum requirements and test methods for trial frames for holding trial case lenses complying with ISO 9801 in front of a subject's eyes in order to assess visual acuity and facilitate optical correction of vision. This standard is applicable to lens holders mounted on headbands, bracket-mounted frames and frames mounted in the manner of spectacles with supports on the ears and the bridge of the nose. It is applicable to all types of trial frames, including half-eye end rotating lens holders.