Bernell Orthoptic Training Tranaglyph BC/51
 Catalogue Number: 3670 Bernell Orthoptic Training Tranaglyph BC/51 Category: Equipment Sub-Category: Tests of binocular vision Corporation: Bernell Corporation Year Of Publication/Manufacture: 1980 Time Period: 1940 to 1999 Place Of Publication/Manufacture: South Bend, Indiana, USA Publisher/Manufacturer: Bernell Corporation Description Of Item: Three identical translucent slides 255 mm x 140 mm imprinted with four sets of separated images in red and green, four sets of concentric circles with a square, an X and a circle within them and a centrally placed diamond. When fused the concentric circle targets appear three dimensional. The diamond provides a suppression check. The border of the slide contains the words TRANAGLYPH ORTHOPTIC SLIDE BC/51 and 1980 BERNELL CORP. South Bend, IN. Historical Significance: Bernard Vodnoy established the Bernell Corporation to produce a number of binocular vision measurement and training aids. The tranaglyph 5X series allowed training of fusional convergence and divergence for prism from 1 base in to 22 base out using red-green images and red-green glasses. See also Cat. Nos. 1685, 1868, 1904, 2782 and 3671. How Acquired: Donated by Colin Bates Date Acquired: 08/10/2018 Condition: Good Location: Archive room. West wall. Unit 4 Drawer 5 |