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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.

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  • Publisher Full Text

    • Authors+Show Affiliations

    Schor CM
    School of Optometry, University of California at Berkeley, Vision Science Group, 512 Minor Hall, Berkeley, CA 94720-2020, USA. schor@socrates.berkely.edu
    Bharadwaj SR
    No affiliation info available

    MeSH

    Accommodation, OcularAdolescentAdultAgingCiliary BodyElasticityHumansLens, CrystallineMiddle AgedModels, BiologicalMuscle, SmoothPresbyopiaViscosity

    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 -