for testing visual acuity; for determination of refraction, e.g. phoropters

Full Title

Apparatus for testing the eyes; Instruments for examining the eyes > Subjective types, i.e. testing apparatus requiring the active assistance of the patient > for testing visual acuity; for determination of refraction, e.g. phoropters

Classification Context

Section:

HUMAN NECESSITIES

Class:

MEDICAL OR VETERINARY SCIENCE; HYGIENE

Subclass:

DIAGNOSIS; SURGERY; IDENTIFICATION

Child Classifications

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• A61B 3/032 Devices for presenting test symbols or characters, e.g. test chart projectors
• A61B 3/036 for testing astigmatism
• A61B 3/04 Trial frames; Sets of lenses for use therewith