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Dr Gruening's Hand Skiascopes / lens racks
OPTOMETRIC INSTRUMENTS
retinoscopy rack
Europe: Germany
c.1895
wood; glass; cardboard; vinyl
1999.337
OPTOMETRIC INSTRUMENTS
retinoscopy rack
Europe: Germany
c.1895
wood; glass; cardboard; vinyl
Set of four lens racks. Black wood, each containing eight small round lenses (two containing plus lenses, the others minus lenses). Pair of convex racks marked in yellow from 0.5 to 2.5 D and 3.0 to 10.0 D. Pair of concave racks marked in white from 1.0 to 3.5 D and 4.0 to 20.0 D. Contained within vinyl-covered cardboard carrying case.
1999.337