field lens

field lens

noun Optics.
the lens in an eyepiece that is farthest from the eye and that deviates rays toward the center of the eye lens.

Origin:
1830–40
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Field lens is always a great word to know.
So is doohickey. Does it mean:
a gadget; dingus; thingumbob.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
WordNet
field lens

noun
the lens that is farthest from the eye in an optical device with more than one lens 
WordNet® 3.0, © 2006 by Princeton University.
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