Abstract: A clip having an upper positioning member and a lower positioning member is disclosed for removably attaching a magnifying lens to a visor or brim of a hat. A carriage having a sliding portion and a supporting portion is slidably positioned with the lower positioning member. One end of a link is pivotably positioned with the supporting portion of the carriage. A holding member is pivotably positioned with the other end of the link. The holding member is movable between a rest position, a gripping position to grip the lens and a flexed position to facilitate removal of the lens.