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.
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 -