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

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