A theoretical mechanism of tarsal ectropion and involutional entropion illustrated by an animated film
Author: Philippe Imbert
Base Hospital / Institution: Clinique La Croix du Sud 31130 TOULOUSE
Rapid fire oral presentation
Abstract ID: 24-260
Purpose
A theoretical mechanism of tarsal ectropion and involutional entropion is first presented via an pathogenic algorithm then illustrated by an animated film describing the kinetics of each of the retractor layers at the origin of eyelid instability, and the consequent rotation of the lid margin leading to these two lower eyelid malpositions.
Methods
This presentation follows a recent theory proposing for tarsal ectropion and involutional entropion an overarching mechanism by which the lower eyelid would rotate in one direction or another, involving an involutional change in only the lower eyelid retractors, the posterior layer of the retractors being weakened in both tarsal ectropion and involutional entropion while the anterior layer is weakened only in involutional entropion (doi.org/10.1016/j.jfo.2019.11.008).After recalling descriptive and functional anatomy of lower eyelid retractors resulting from Kakizaki et al’s study, the algorithm for this unified pathogenesis of tarsal ectropion and involutional entropion is presented and illustrated by an animated film.
Results
The theoretical mechanism of the rotation of the lower eyelid margin leading to tarsal ectropion and involutional entropion is illustrated as best as possible by this animated film. It describes the complex kinetics specific to each of the two layers of retractors, from their specific alteration to the final eyelid malposition.
Conclusion
Understanding the complex mechanism by which the lower eyelid would rotate in one direction or another is greatly facilitated by this animated film visualizing the movements of each layer of retractors causing a tarsal ectropion or an involutional entropion.
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