Opsiometer

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Opsiometer \Op`si*om"e*ter\, n. [Gr. ? sight + -meter: cf. F.
     opsiom[`e]tre.]
     An instrument for measuring the limits of distinct vision in
     different individuals, and thus determiming the proper focal
     length of a lens for correcting imperfect sight. --Brande &
     C.


     [1913 Webster]