title: Potential signal to accommodation from the Stiles-Crawford effect and ocular monochromatic aberrations.
abstract: The purpose of this study is to determine if cues within the blurred retinal image due to the Stiles-Crawford (SC) effect and the eye's monochromatic aberrations can drive accommodation with a small pupil (3 mm) that is typical of bright photopic conditions.The foveal, psychophysical SC function (17 min arc) and ocular monochromatic aberrations were measured in 21 visually normal adults. The retinal image of a 10.2 min arc disc was simulated for spherical defocus levels of -1 D, 0 D and +1 D in each of four conditions consisting of combinations of the presence or absence of the individual SC function and monochromatic aberrations with a 3 mm pupil. Accommodation was recorded in eleven participants as each viewed the simulations through a 0.75-mm pinhole.The SC effect alone did not provide a significant cue to accommodation. Monochromatic aberrations provided a statistically significant but rather small cue to monocular accommodation.
authors.affiliation: School of Optometry, Queensland University of Technology, Brisbane, Australia.
authors.forename: Lawrence R
authors.initials: LR
authors.lastname: Stark
authors.forename: Philip B
authors.initials: PB
authors.lastname: Kruger
authors.forename: Frances J
authors.initials: FJ
authors.lastname: Rucker
authors.forename: William H
authors.initials: WH
authors.lastname: Swanson
authors.forename: Nathan
authors.initials: N
authors.lastname: Schmidt
authors.forename: Caitlin
authors.initials: C
authors.lastname: Hardy
authors.forename: Hadassa
authors.initials: H
authors.lastname: Rutman
authors.forename: Theodore
authors.initials: T
authors.lastname: Borgovan
authors.forename: Sean
authors.initials: S
authors.lastname: Burke
authors.forename: Mustanser
authors.initials: M
authors.lastname: Badar
authors.forename: Raj
authors.initials: R
authors.lastname: Shah