title: Assessment of adult stereopsis using the Lang 1 Stereotest: a pilot study.
abstract: OBJECTIVE
  To assess the use of the Lang 1 Stereotest as a vision-screening test for adults, for which little is known or reported.
  
  
  METHODS
  The Lang 1 Stereotest was administered to 292 consecutive participants of the Visual Impairment Project (VIP) five year followup study, which is a population based study of eye disease in Melbourne, Australia. 56.9% were female. The mean age was 59.4 years, range 44-90 years. A "positive" stereoscopic response was recorded where the stereoscopic target image was correctly named; a "partial positive" response where depth was appreciated but the shape could not be named; and a "negative" response where there was no appreciation of a stereo effect. The responses were further categorized so that the test was either "passed" or "failed". A "pass" score was 3/3 positive responses; 3/3 partial positive responses or 2/3 positive and/or partial positive responses where the negative response was at the 550" of arc stereoacuity level. "Failure" was 3/3 negative responses and 2/3 negative responses where the positive or partial positive response as at the 1200" level.
  
  
  RESULTS
  Of the 292 participants tested, 19 (6.5%) participants "failed" the test. In addition to strabismus and anisometropia, failure was associated significantly (p<0.001) with reduced distance visual acuity (<6/12) irrespective of the ocular morbidity.
  
  
  CONCLUSIONS
  The Lang 1 Stereotest correctly identified people with vision defects associated with reduced stereopsis. This suggests the Lang 1 Stereotest is an appropriate for the vision screening of adults as it is for children.
authors.affiliation: Centre for Eye Research Australia, East Melbourne, Australia. sbrown@raco.org.au
authors.forename: S
authors.initials: S
authors.lastname: Brown
authors.forename: L
authors.initials: L
authors.lastname: Weih
authors.forename: N
authors.initials: N
authors.lastname: Mukesh
authors.forename: C
authors.initials: C
authors.lastname: McCarty
authors.forename: H
authors.initials: H
authors.lastname: Taylor
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000550:Amblyopia / Q000150:complications; D003867:Depth Perception; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010468:Perceptual Disorders / Q000175:diagnosis* / Q000209:etiology; D010865:Pilot Projects; D011446:Prospective Studies; D012307:Risk Factors; D013285:Strabismus / Q000150:complications; D015351:Vision Screening / Q000379:methods*; D015348:Vision, Binocular; D014792:Visual Acuity; D019987:Persons with Visual Disabilities