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A pulse-step model of accommodation dynamics in the aging eye.
Vision Res. 2005 May; 45(10):1237-54.VR

Abstract

We have developed a dynamic model of accommodation that combines independent phasic-velocity and tonic-position neural signals to control position, velocity and acceleration properties of accommodative step responses. Phasic and tonic signals were obtained from neural integration of a fixed-height acceleration-pulse and variable-height velocity-step respectively to control independent acceleration and velocity properties of the step response. Duration and amplitude of the acceleration-pulse are increased with age to compensate for age-related increases of visco-elastic properties of the lens to maintain youthful velocity. The model illustrates a neural control strategy that is similar to the classical neural control model of step changes by the saccadic and vergence systems.

Authors+Show Affiliations

School of Optometry, University of California at Berkeley, Vision Science Group, 512 Minor Hall, Berkeley, CA 94720-2020, USA. schor@socrates.berkely.eduNo affiliation info available

Pub Type(s)

Journal Article
Research Support, U.S. Gov't, P.H.S.

Language

eng

PubMed ID

15733957

Citation

Schor, Clifton M., and Shrikant R. Bharadwaj. "A Pulse-step Model of Accommodation Dynamics in the Aging Eye." Vision Research, vol. 45, no. 10, 2005, pp. 1237-54.
Schor CM, Bharadwaj SR. A pulse-step model of accommodation dynamics in the aging eye. Vision Res. 2005;45(10):1237-54.
Schor, C. M., & Bharadwaj, S. R. (2005). A pulse-step model of accommodation dynamics in the aging eye. Vision Research, 45(10), 1237-54.
Schor CM, Bharadwaj SR. A Pulse-step Model of Accommodation Dynamics in the Aging Eye. Vision Res. 2005;45(10):1237-54. PubMed PMID: 15733957.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A pulse-step model of accommodation dynamics in the aging eye. AU - Schor,Clifton M, AU - Bharadwaj,Shrikant R, Y1 - 2004/12/16/ PY - 2004/07/27/received PY - 2004/10/26/revised PY - 2004/11/01/accepted PY - 2005/3/1/pubmed PY - 2005/4/20/medline PY - 2005/3/1/entrez SP - 1237 EP - 54 JF - Vision research JO - Vision Res. VL - 45 IS - 10 N2 - We have developed a dynamic model of accommodation that combines independent phasic-velocity and tonic-position neural signals to control position, velocity and acceleration properties of accommodative step responses. Phasic and tonic signals were obtained from neural integration of a fixed-height acceleration-pulse and variable-height velocity-step respectively to control independent acceleration and velocity properties of the step response. Duration and amplitude of the acceleration-pulse are increased with age to compensate for age-related increases of visco-elastic properties of the lens to maintain youthful velocity. The model illustrates a neural control strategy that is similar to the classical neural control model of step changes by the saccadic and vergence systems. SN - 0042-6989 UR - https://www.unboundmedicine.com/medline/citation/15733957/A_pulse_step_model_of_accommodation_dynamics_in_the_aging_eye_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0042-6989(04)00576-0 DB - PRIME DP - Unbound Medicine ER -