Keystone Ophthalmic Telebinocular

Catalogue Number: 1650
Keystone Ophthalmic Telebinocular
Category: Equipment
Sub-Category: Vision screener
Designer/inventor: Gifford M Mast & Wright K Gannett
Year Of Publication/Manufacture: 1960's
Time Period: 1940 to 1999
Place Of Publication/Manufacture: Davenport, Iowa, USA
Publisher/Manufacturer: Keystone View Co
Description Of Item: Binocular vision screener. Cream coloured metal unit with eyepiece section, internal target illumination and adjustable cardholder mounted on lockable angle-poise arm and base. Sliding card position calibrated in Dioptres of accommodation. Labelled: 'Keystone View. OPHTHALMIC TELEBINOCULAR MADE IN USA. PAT No 2,557,608. KEYSTONE VIEW SINCE 1892. DIVISION OF MAST/ KEYSTONE DAVENPORT, IOWA 52803.' Serial Number on sticker on base: 21873. Complete with double lens holder/occluders, 2 sets of Keystone target cards: 005-170 PEEK-A-BOO TEST SET & 005-100 VISUAL SKILLS TEST SET, Instruction sheets, 2 test record score pads and plastic dust cover. H: 41cm x W: 24cm x D: 42cm
Historical Significance: This unit was used for decades by school nurses at The Peninsula School, Mt Eliza, to screen the vision of incoming Year 7 students. It was decommissioned in 2010 as the company that had calibrated and serviced the machine felt that it was no longer worth maintaining.US Patent 2,557,608 was granted on June 19, 1951 to Gifford M Mast & Wright K Gannett and assigned to the Keystone View Company. (See instruction manual Cat No 2016 for details of operation including its use for binocular refraction). The Keystone View Company was founded in 1895 by B L Singley, a typewriter salesman, with an interest in stereographic photography. It became a major distributor of stereographic images, located in Meadville, Pennsylvania. From 1892 to 1963 Keystone produced and distributed both educational and comic/sentimental stereoviews, and stereoscopes. By 1905 it was the world's largest stereographic company. By 1935 it had photographers around the world and a stock of 2 million stereo negatives. Keystone's Stereo-ophthalmic Department was formed in 1932 to meet the needs of eye specialists, safety and efficiency engineers and psychologists who needed stereoscopic vision tests. In 1963 Department A (stereoviews sold to individual families) and the Education Departments were closed down, but Keystone continued to manufacture eye-training stereographic products as a subsidiary of Mast Development Company. In 1972 Mast closed the Meadville manufacturing site.
How Acquired: Donated by The Peninsula School, Mt Eliza
Date Acquired: 28.10.2010
Condition: Very good
Location: Archive office. East wall shelves unit 1

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