title: [Application of contrast vision in identifying the malingering decreased vision].
abstract: OBJECTIVE
  To study the application value of contrast vision in identifying the malingering decreased vision in the practice of clinical forensic medicine.
  
  
  METHODS
  Thirty-one young and middle aged volunteers were selected and divided randomly into group 1 (16 persons with 32 eyes) and group 2 (15 persons with 30 eyes). The optotype contrast was 100%, 25%, 10% and 5%, respectively. The contrast vision of group 1 was tested. The contrast vision of group 2 was tested as follows: (1) the volunteers cooperated without inspector's interference; (2) the volunteers cooperated under inspector's interference; (3) the volunteers disguised decreased vision without inspector's interference; (4) the volunteers disguised decreased vision under inspector's interference. The data was then analyzed by statistics.
  
  
  RESULTS
  There was a close correlation between contrast vision and contrast. As the contrast decreased, the vision acuity also decreased. The contrast vision curve of former two methods showed a good reproducibility while the contrast vision curve of latter two methods had a bad reproducibility.
  
  
  CONCLUSIONS
  The repetition of contrast curve with or without inspector's interference can be used to discriminate malingering vision. The acquired contrast curves can be provided to the court as direct evidence and can help enhance the verification conclusion.
authors.affiliation: Department of Forensic Medicine, Shanghai Medical College, Fudan University, Shanghai 200030, China. fudancjm@hotmail.com
authors.forename: Jie-Min
authors.initials: JM
authors.lastname: Chen
authors.forename: Shu-Ya
authors.initials: SY
authors.lastname: Peng
authors.forename: Wen-Tao
authors.initials: WT
authors.lastname: Xia
authors.forename: Rui-Jue
authors.initials: RJ
authors.lastname: Liu
authors.forename: Chun-Hong
authors.initials: CH
authors.lastname: Weng
mesh_terms: D000328:Adult; D015350:Contrast Sensitivity / Q000502:physiology; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008297:Male; D008306:Malingering / Q000175:diagnosis* / Q000523:psychology; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012720:Severity of Illness Index; D014787:Vision Tests / Q000379:methods* / Q000706:statistics & numerical data; D015348:Vision, Binocular; D015354:Vision, Low / Q000175:diagnosis* / Q000523:psychology; D014792:Visual Acuity; D055815:Young Adult