Identifying optical device with green target lines and ink pens

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4 replies · 2K views
Eecinee
I'm stumped by this one... Any idea what it is? Inside there is a focusable optical target with 3 green lines. The white "pens" dip in ink and mark something. Any ideas?

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http://www.centralstores.iastate.edu/surplus/items-for-sales
 
This does not appear to be any sort of standard polarimeter. This does not explain the white pens that mark on some surface.
 
Figured it out.. thought it was physics / science related but actually it's medical. It's a lensometer for optometry.