title: Measurement of stray light and glare: comparison of Nyktotest, Mesotest, stray light meter, and computer implemented stray light meter.
abstract: OBJECTIVE
  To evaluate the properties of devices for measuring stray light and glare: the Nyktotest, Mesotest, "conventional" stray light meter and a new, computer implemented version of the stray light meter.
  
  
  METHODS
  112 subjects, divided in three groups: (1) young subjects without any eye disease; (2) elderly subjects without any eye disease, and (3) subjects with (early) cataract in at least one eye. All subjects underwent a battery of glare and stray light tests, measurement of visual acuity, contrast sensitivity, refraction, and LOCS III cataract classification. Subjects answered a questionnaire on perceived disability during driving.
  
  
  RESULTS
  Repeatability values were similar for all glare/stray light tests. Validity (correlation with LOCS III and questionnaire scores), discriminative ability (ability to discriminate between the three groups), and added value (to measurement of visual acuity and contrast sensitivity) were all superior for both stray light meters. Results of successive measurements are interrelated for the conventional but not the new stray light meter. This indicates a better resistance to fraud for the latter device.
  
  
  CONCLUSIONS
  The new computer implemented stray light meter is the most promising device for future stray light measurements.
authors.affiliation: Ophthalmology, Vrije Universiteit Medical Centre, PO Box 7057, NL-1007 MB Amsterdam, Netherlands. vanrijn@vumc.nl
authors.forename: L J
authors.initials: LJ
authors.lastname: van Rijn
authors.forename: C
authors.initials: C
authors.lastname: Nischler
authors.forename: D
authors.initials: D
authors.lastname: Gamer
authors.forename: L
authors.initials: L
authors.lastname: Franssen
authors.forename: G
authors.initials: G
authors.lastname: de Wit
authors.forename: R
authors.initials: R
authors.lastname: Kaper
authors.forename: D
authors.initials: D
authors.lastname: Vonhoff
authors.forename: G
authors.initials: G
authors.lastname: Grabner
authors.forename: H
authors.initials: H
authors.lastname: Wilhelm
authors.forename: H J
authors.initials: HJ
authors.lastname: Völker-Dieben
authors.forename: T J T P
authors.initials: TJ
authors.lastname: van den Berg
mesh_terms: D000221:Adaptation, Ocular; D000328:Adult; D000704:Analysis of Variance; D001334:Automobile Driving; D016022:Case-Control Studies; D002386:Cataract / Q000503:physiopathology*; D015350:Contrast Sensitivity; D003936:Diagnosis, Computer-Assisted; D004192:Discrimination, Psychological; D019466:Glare; D006801:Humans; D008875:Middle Aged; D009887:Ophthalmoscopy; D014792:Visual Acuity
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