title: Vernier acuity and aging.
abstract: OBJECTIVE
  Many visual functions change with age. Hyperacuity vernier thresholds, however, seem to remain practically invariant with age.
  
  
  METHODS
  We critically review reports on age-related changes in hyperacuity thresholds and present new data using two and three-point vernier hyperacuity thresholds.
  
  
  RESULTS
  It appears as though the vernier (two dot or two line) alignment hyperacuity thresholds are not sensitive to age.
  
  
  CONCLUSIONS
  Based on these studies we propose that hyperacuity (vernier) thresholds be used as a benchmark, or a gold standard for aging studies. This measurement can serve as a valuable control and reference for other clinical studies of aging.
authors.affiliation: School of Optometry, University of Missouri-St. Louis 63121-5606, USA.
authors.forename: V
authors.initials: V
authors.lastname: Lakshminarayanan
authors.forename: J M
authors.initials: JM
authors.lastname: Enoch
mesh_terms: D000328:Adult; D000368:Aged; D000375:Aging / Q000502:physiology*; D006801:Humans; D008875:Middle Aged; D012684:Sensory Thresholds; D014792:Visual Acuity; D014796:Visual Perception