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Quantification of Oculomotor Responses and Accommodation Through Instrumentation and Analysis Toolboxes
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Seeing the future: Predictive control in neural models of ocular accommodation.
Jenny C A Read1,2, Christos Kaspiris-Rousellis1,3, Toby S Wood4,5
1Biosciences Institute, Newcastle University, Newcastle upon Tyne, United Kingdom.
Journal of Vision
|August 4, 2022
Summary
This study models ocular accommodation, the eye's focus adjustment mechanism. A dual integral control system with a Smith predictor accurately explains accommodative responses and adaptation effects.
Area of Science:
- Ophthalmology
- Control Theory
- Computational Neuroscience
Background:
- Ocular accommodation adjusts the crystalline lens for sharp retinal focus.
- Retinal defocus is the primary stimulus for accommodation.
- Accurate accommodative control is vital for clear vision.
Purpose of the Study:
- To introduce control theory concepts to vision scientists.
- To present a unified model of accommodative control.
- To explain accommodative response properties across various stimuli.
Main Methods:
- Utilized dual integral control theory.
- Incorporated a Smith predictor to account for sensorimotor latencies.
- Developed a model explaining adaptation and response to sinusoidal stimuli.
Main Results:
- Dual integral control with a Smith predictor accurately models accommodative responses.
- The model accounts for adaptation effects and sinusoidal oscillation gain/phase.
- A novel proportional-control signal explains accommodative microfluctuations.
Conclusions:
- Critically-damped dual integral control with a Smith predictor provides a comprehensive model for ocular accommodation.
- The model successfully explains both steady-state and dynamic aspects of accommodation.
- Proposed control signal offers insights into focus optimization and microfluctuations.
