CPC Subgroup
A61B 3/028 for testing visual acuity; for determination of refraction, e.g. phoropters
Full Title
Apparatus for testing the eyes; Instruments for examining the eyes (eye inspection using ultrasonic, sonic or infrasonic waves A61B8/10) > Subjective types, i.e. testing apparatus requiring the active assistance of the patient > for testing visual acuity; for determination of refraction, e.g. phoropters
4 direct subcodes
Child Classifications
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- A61B 3/032 Devices for presenting test symbols or characters, e.g. test chart projectors (A61B3/036 takes precedence)
- A61B 3/036 for testing astigmatism
- A61B 3/04 Trial frames; Sets of lenses for use therewith