opsiometer
English edit
Etymology edit
Ancient Greek; compare French opsiomètre.
Noun edit
opsiometer (plural opsiometers)
- An old instrument for measuring vision and determining the focal length of a lens that can correct an individual's imperfect eyesight[from 19th century].
Part or all of this entry has been imported from the 1913 edition of Webster’s Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
(See the entry for “opsiometer”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.)