Optical refraction testing instrument
FIG. 1 is a perspective view of an optical refraction testing instrument, showing my new design.
FIG. 2 is a front elevational view thereof.
FIG. 3 is a top plan view thereof.
FIG. 4 is a side elevational view as taken from the left hand side of FIG. 2.
FIG. 5 is a bottom plan view thereof.
FIG. 6 is a rear elevational view thereof.
International Classification: D2401;