Thin-Film Buckling Theory and Clinical Application of the Mechanism of Double Eyelid Formation.

Background: The mechanism underlying the formation of upper eyelid creases has been the subject of extensive study and ongoing debate. This research aims to elucidate the principles of upper eyelid creases formation, leveraging the membrane bending theory from engineering mechanics.

Methods: We developed an anatomical model of the eyelid and implemented the finite element analysis.

N,N'-[(2,3,5,6-Tetra-methyl-p-phenyl-ene)dimethyl-ene]bis-[2-chloro-N-(2-chloro-ethyl)ethanamine].

The title mol-ecule, C(20)H(32)Cl(4)N(2), lies on an inversion center. A weak intra-molecular C-H⋯N hydrogen bond may, in part, influence the conformation of the mol-ecule.