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Update on the Danish optical device

Dan Russell • August 16, 2015
 SearchReSearch
Republished with permission from SearchReSearch
Update on the Danish optical device Dan Russell
I ran a few images of devices ...

that might have been found in a Danish opticians office past Elin over the weekend. Here is the one that she said seemed most-like the one she remembered. This is a keratometer from the 1950s.


In particular, it was a monocular device. The biggest difference is that Elin recalls seeing blue and red rings, a bit like the duochrome test.

One optometrist's page tells us that the duochrome test is often red-green, but that blue may be substituted for green on occasion. That same page also tells us that circles are sometimes used in the test, and they're called Verhoeff's Circles.

Don't know if this will solve the Challenge or not, but I thought I should give you this additional clue!

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About the Author

Dan RussellDan Russell

I study the way people search and research. I guess that makes me an anthropologist of search. While I work at Google, my blog and G+ posts reflects my own thoughts and not those of my employer. I am FIA's Future-ist in Residence. More »

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