phoropter
English edit
Etymology edit
From a trademark.
Noun edit
phoropter (plural phoropters)
- An instrument used in eye examinations to determine an individual's prescription, the patient looking through various lenses at a chart on the other side.
- 2007 September 11, Laura Novak, “Not Autistic or Hyperactive. Just Seeing Double at Times”, in New York Times[1]:
- Testing includes using a pen or finger to test for the “near point of convergence,” as well as a phoropter, which uses lenses and prisms to test the eyes’ ability to work together.