Including lens selectively insertable in optical path:
(under subclass 205) Subject matter wherein adjustably mounted test lens(es) are selectively placed in front of the observed eye for measuring the refraction of the eye so as to provide correcting lenses therefor.
(1) Note. The lenses may be spherical, cylindrical or prismatic, and may be insertable in monocular or binocular test instruments, which may be portable or fixedly mounted in a physicians's office.
SEE OR SEARCH THIS CLASS, SUBCLASS:
234, for subjective testing instruments wherein lenses or filters are mounted on a rotatable disc.
