Computer-Animated Model of Accommodation and Presbyopia
Narrative Responses:
Purpose
To present a computer-animated model of the structures of accommodation based on new understanding of the anatomy of the zonular architecture integrated with biometric measurements of the structures of accommodation.
Methods
A three-dimensional computer animated model of the eye in accommodation and dis-accommodation was produced in collaboration with an experienced medical animator. Recent discovery of the anatomical arrangement of extra-lenticular structures including all zonular elements and movement of the anterior vitreous membrane is incorporated in a second-generation model with accurate dimensions scaled to current biometry studies. Model-based cognitive reasoning is utilized to demonstrate the synchronous movements occurring during accommodation in the normal adult eye and in presbyopia.
Results
Utilizing model-based reasoning the mechanism of accommodation is demonstrated suggesting an integration of prior theories including the concept of reciprocal zonular action, and demonstrating the role of the anterior vitreous membrane and movements of aqueous and vitreous spaces during accommodation. The role of the choroid in providing an elastic foundation for the accommodating structures and providing stored energy for dis-accommodation is demonstrated, as well as recently described changes in the sclera during accommodation.
Conclusion
Computer-animated modeling of accommodation demonstrates the power of cognitive science to advance our understanding of accommodation. The mechanism of accommodation is no longer the mystery it once was.