title: Temporal characteristics of proximally-induced accommodation.
abstract: This study sought to determine whether proximally-induced accommodation (PIA) is capable of sustaining an accommodative response over time. Accordingly, the steady-state PIA response was measured during the course of a continuous 5 min stimulus period for targets located at distances of 0.2 or 6 m. The vergence and accommodation loops were opened by subjects (n = 8) monocularly viewing the targets through a 0.5 mm pinhole, while accommodation was assessed using an objective, open-field, infrared optometer. The mean PIA response did not change significantly during the fixation period. This finding suggests that PIA is indeed capable of maintaining a sustained response. This observation is consistent with the constancy of apparent target distance perception during extended fixation of a stationary object of regard under these conditions.
authors.affiliation: Department of Vision Sciences, State University of New York/State College of Optometry, NY 10010.
authors.forename: M
authors.initials: M
authors.lastname: Rosenfield
authors.forename: J L
authors.initials: JL
authors.lastname: D'Amico
authors.forename: S
authors.initials: S
authors.lastname: Nowbotsing
authors.forename: N
authors.initials: N
authors.lastname: Kapoor
authors.forename: K J
authors.initials: KJ
authors.lastname: Ciuffreda
mesh_terms: D000065:Accommodation, Ocular / Q000502:physiology*; D000221:Adaptation, Ocular / Q000502:physiology; D000328:Adult; D003290:Convergence, Ocular / Q000502:physiology; D005260:Female; D005403:Fixation, Ocular / Q000502:physiology; D006801:Humans; D008297:Male; D013997:Time Factors