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OPTOMETRIC INSTRUMENTS
visual screening test; vision screener
Keystone View Company
North America: USA, Pennsylvania, Meadville
1960s
metal
instrument: 455 x 255 x 410 mm; case: 500 x 475 x 310 mm
Binocular vision screener. Cream-coloured plastic eyepiece section with lamp unit on height-adjustable metal anglepoise arm and base. D-shaped lenses. Two swivelling occluders. Black plastic stereogram card holder with tightening screw. Set of stereograms including: Keystone Snellen Acuity Test, Near Point Snellen Acuity Test, Distance Numerals Acuity Test, N.Y. School Vision Test, Ready-to-read Test (Lateral and Vertical Posture at Near Point), Preschool Test (Visual Acuity 20/70 and 20/40), Ready-to-read Test (Usable vision 20/100 and 20/40 at Near Point), V.S. Short Test (Far Point and Near Point), Dvorine Color Screening test (severe and mild colour blindness) plus instruction cards and answer sheets. Contained in purpose-built carrying case with separate lid secured by two white metal clasps.
2005.405
Ex Monica Britton Collection, Bristol