File:Holmgren's coloured wool test for colour blindness, Europe, Wellcome L0058974.jpg

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Summary

Holmgren's coloured wool test for colour blindness, Europe,
Title
Holmgren's coloured wool test for colour blindness, Europe,
Description

The patient had to match one piece of wool to the samples in the box in this colour blindness test. There are light and dark shades to confuse the patient. This helped detect problems. The numbers on the pieces of wool were codes. The doctor used them to determine what type colour blindness the patient had.

Swedish physiologist Alarik Frithiof Holmgren (1831-1897) devised this test in 1874. He pursued his investigations following a railway accident in Sweden in 1876. The accident was believed to be caused by a colour blind train driver. Following Holmgren’s research, colour blindness tests were made compulsory for railway and shipping workers in Sweden.

maker: Unknown maker

Place made: Europe

Wellcome Images
Keywords: Ophthalmology; colour blindness test
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This file comes from Wellcome Images, a website operated by Wellcome Trust, a global charitable foundation based in the United Kingdom. Refer to Wellcome blog post (archive).
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References
  • Library reference: Science Museum A662592
  • Photo number: L0058974
Source/Photographer

https://wellcomeimages.org/indexplus/obf_images/fc/22/35677a8338e204b2cb147b7c0774.jpg

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Image extraction processThis file has an extracted image: Holmgren's coloured wool test for colour blindness, Europe, Wellcome L0058974 (cropped).jpg.
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current16:35, 17 October 2014Thumbnail for version as of 16:35, 17 October 20142,832 × 3,796 (1.25 MB)Fæ=={{int:filedesc}}== {{Artwork |artist = |author = |title = Holmgren's coloured wool test for colour blindness, Europe, |description = The patient had to match one piece of wool to the samples in the box in t...
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