title: Evaluation of night vision disturbances.
abstract: BACKGROUND
  Evaluation of night vision disturbances has relied on subjective responses. We designed a test to more objectively measure night vision disturbances.
  
  
  METHODS
  The test consisted of projecting a small circle onto a visual acuity screen. The patient is asked to draw exactly what he sees on an Amsler grid. We evaluated 118 eyes in photopic and scotopic conditions and under different conditions of refractive correction.
  
  
  RESULTS
  Image degradation increased in scotopic conditions for myopes (p = .0001), hyperopes (p = .005), and emmetropes (p = .01). Myopic refractive error correlated with size of glare response (p = .001). Astigmatism correlated with decentration of glare response (p = .0001). Decentration increased in scotopic compared to photopic conditions (p = .002).
  
  
  CONCLUSIONS
  Our test offers a simple, convenient way to evaluate night vision disturbances and may offer a means of assessing night vision disturbances in patients considering refractive surgery.
authors.affiliation: Department of Ophthalmology, Columbia Presbyterian Medical Center, New York, NY 10032.
authors.forename: G J
authors.initials: GJ
authors.lastname: Florakis
authors.forename: D A
authors.initials: DA
authors.lastname: Jewelewicz
authors.forename: H E
authors.initials: HE
authors.lastname: Michelsen
authors.forename: S L
authors.initials: SL
authors.lastname: Trokel
mesh_terms: D000293:Adolescent; D000328:Adult; D003623:Dark Adaptation; D005260:Female; D006801:Humans; D008027:Light; D008297:Male; D008875:Middle Aged; D009755:Night Blindness / Q000175:diagnosis*; D012030:Refractive Errors / Q000209:etiology / Q000503:physiopathology; D014786:Vision Disorders / Q000209:etiology / Q000503:physiopathology; D014787:Vision Tests / Q000379:methods*; D014792:Visual Acuity; D014796:Visual Perception / Q000502:physiology