title: [Vision measurement in candelas: description of a psychophysical technique to quantify luminous intensity].
abstract: OBJECTIVE
  To develop a method and a device for vision measurement in candela (cd). Vision measurement studies are important to all visual sciences.
  
  
  METHODS
  It is a theoretical and experimental study. The details of psychophysical method and device calibration were described. Preliminary tests were performed on volunteers.
  
  
  RESULTS
  It is a simple psychophysical test and results are expressed in International System of Units. With this technical description it will be possible to reproduce the experiment in others research centers.
  
  
  CONCLUSIONS
  The results measured in luminous intensity (cd) are an option for visual studies. These results allow to extrapolate measurements for mathematical models and to simulate data for individual aberrometry effects.
authors.affiliation: Departamento de Oftalmologia, Universidade Federal do Estado de São Paulo, SP, Brasil. oftalmologia@msn.com
authors.forename: Airton Leite
authors.initials: AL
authors.lastname: Kronbauer
authors.forename: Paulo
authors.initials: P
authors.lastname: Schor
authors.forename: Wallace
authors.initials: W
authors.lastname: Chamon
authors.forename: Luis Alberto Vieira de
authors.initials: LA
authors.lastname: Carvalho
mesh_terms: D000465:Algorithms; D004867:Equipment Design; D006801:Humans; D007394:International System of Units / Q000295:instrumentation*; D008962:Models, Theoretical; D010364:Pattern Recognition, Visual; D010775:Photic Stimulation; D011601:Psychophysics; D015203:Reproducibility of Results; D014787:Vision Tests / Q000295:instrumentation / Q000379:methods*; D014792:Visual Acuity / Q000502:physiology; D014796:Visual Perception / Q000502:physiology