Rodenstock colour vision test disc 3040.173

Catalogue Number: 3425
Rodenstock colour vision test disc 3040.173
Category: Equipment
Sub-Category: Colour Vision Test
Designer/inventor: GUILING G., WIECZOREK H. L.
Year Of Publication/Manufacture: 1976
Time Period: 1940 to 1999
Place Of Publication/Manufacture: Munich, Germany
Publisher/Manufacturer: G Rodenstock Instrumente GmbH
Description Of Item: Black plastic disc, 120 mm diameter, with 12 circular test colours arranged in a circle around the disc. The disc is designed to be inserted in a Rodenstock vision screener to provide a colour vision screening test. The Rodenstock vision screener provides binocular viewing. The 12 test colours are paired so there are 6 identical pairs. The disc rotates with 6 stops and at each stop the identical pairs are presented to the left and right eyes and are 'fused' so the testee sees only one image. Each circular test colour is divided in half. One pair has the same colour in both halves: the other 5 have different colours that are on the confusion lines of the red-green colour vision deficiencies. It is contained in a blue padded book-like folder. Disc is marked on rear '3040.173'. Blue folder 162 x 140 x 20 mm.
Historical Significance: This test is designed to detect persons who have a red-green colour vision deficiency and the colours have been chosen to make a diagnosis of protanomaly, protanopia, deuteranomaly and deuteranopia. Details of the design principles and validation data can be found in Guiling G, Wieczorek HL A new screening method for detecting colour vision deficiencies. Mod Prob Ophthal 1976; 17: 201-210 and Verriest G, Ubijls A. Value of the Rodenstock Farbentestscheibe 3040.173 for diagnosis of congenital colour vision defects. In; Verriest G (=ed) Colour vision deficiencies VII 1984. The test is now well known an never achieved great acceptance, perhaps because it was an accessory to the Rodenstock vision screener and not a stand alone colour vision test. The validation data suggest it is quite good at detecting abnormal colour vision but less good in diagnosis of type.
How Acquired: Purchased by Kett Museum
Date Acquired: October 2017
Condition: Disc excellent, Folder fair.
Location: Archive room. West wall. Unit 1 Drawer 2

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