title: Perimetry: a need for standardization.
abstract: Luminance measurements of targets and backgrounds revealed differences for various types of perimetric instruments. A lack of uniform testing conditions for instruments of the same design was also noted. Of the instruments measured, hemispheric-projection perimeters seemed to provide the most repeatable test conditions.
mesh_terms: D006801:Humans; D008027:Light; D009898:Optic Disk; D058609:Visual Field Tests / Q000295:instrumentation / Q000379:methods / Q000592:standards*; D014794:Visual Fields