title: The short-term accommodation response to aniso-accommodative stimuli in isometropia.
abstract: OBJECTIVE
  There have been only a limited number of studies examining the accommodative response that occurs when the two eyes are provided with disparate accommodative stimuli, and the results from these studies to date have been equivocal. In this study, we therefore aimed to examine the capacity of the visual system to aniso-accommodate by objectively measuring the interocular difference in the accommodation response between fellow dominant and non-dominant eyes under controlled monocular and binocular viewing conditions during short-term exposure to aniso-accommodative stimuli.
  
  
  METHODS
  The accommodative response of each eye of 16 young isometropic adults (mean age 22 ± 2 years) with normal binocular vision was measured using an open-field autorefractor during a range of testing conditions; monocularly (accommodative demands ranging from 1.97 to 2.90 D) and binocularly while altering the accommodation demand for each eye (aniso-accommodative stimuli ranging from 0.08 to 0.53 D) [Corrected].
  
  
  RESULTS
  Under monocular viewing conditions, the dominant and non-dominant eyes displayed a highly symmetric accommodative response; mean interocular difference in spherical equivalent 0.01 ± 0.06 D (relative) and 0.22 ± 0.06 D (absolute) (p > 0.05). During binocular viewing, the dominant eye displayed a greater accommodative response (0.11 ± 0.34 D relative and 0.24 ± 0.26 D absolute) irrespective of whether the demand of the dominant or non-dominant eye was altered (p = 0.01). Astigmatic power vectors J0 and J45 did not vary between eyes or with increasing accommodation demands under monocular or binocular viewing conditions (p > 0.05).
  
  
  CONCLUSIONS
  The dominant and non-dominant eyes of young isometropic individuals display a similar consensual lag of accommodation under both monocular and binocular viewing conditions, with the dominant eye showing a small but significantly greater (by 0.12-0.25 D) accommodative response. Evidence of short-term aniso-accommodation in response to asymmetric accommodation demands was not observed.
authors.affiliation: School of Optometry and Vision Science, Queensland University of Technology, Brisbane, Australia.
authors.forename: Stephen J
authors.initials: SJ
authors.lastname: Vincent
authors.affiliation: School of Optometry and Vision Science, Queensland University of Technology, Brisbane, Australia.
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Collins
authors.affiliation: School of Optometry and Vision Science, Queensland University of Technology, Brisbane, Australia.
authors.forename: Scott A
authors.initials: SA
authors.lastname: Read
authors.affiliation: University of Rochester, Rochester, USA.
authors.forename: Atanu
authors.initials: A
authors.lastname: Ghosh
authors.affiliation: School of Optometry and Vision Science, Queensland University of Technology, Brisbane, Australia.
authors.forename: Christine
authors.initials: C
authors.lastname: Chen
authors.affiliation: School of Optometry and Vision Science, Queensland University of Technology, Brisbane, Australia.
authors.forename: Anthony
authors.initials: A
authors.lastname: Lam
authors.affiliation: School of Optometry and Vision Science, Queensland University of Technology, Brisbane, Australia.
authors.forename: Sonya
authors.initials: S
authors.lastname: Sahota
authors.affiliation: School of Optometry and Vision Science, Queensland University of Technology, Brisbane, Australia.
authors.forename: Rebecca
authors.initials: R
authors.lastname: Vo
mesh_terms: D000065:Accommodation, Ocular / Q000502:physiology*; D000293:Adolescent; D000328:Adult; D023882:Dominance, Ocular / Q000502:physiology; D005260:Female; D006801:Humans; D008297:Male; D010775:Photic Stimulation; D012030:Refractive Errors / Q000503:physiopathology*; D015348:Vision, Binocular / Q000502:physiology*; D015349:Vision, Monocular / Q000502:physiology*; D055815:Young Adult
keywords: accommodation; aniso-accommodation; interocular symmetry; ocular dominance