The direction of pull of the muscles forms a 23Â° angle relative to the visual axis in the primary position, giving rise to secondary and tertiary functions. The secondary action of vertical rectus muscles is torsion. The superior rectus is an incyclotorter, and the inferior rectus is an excyclotorter.
-Marcia. Dear Marcia, Eyelash growth serums generally contain either a prostaglandin derivative, like prescription Latisse, or over-the-counter Revitalash; peptides, like Jan Marini Growth Serum; or vitamins, like Peter Thomas Roth Lashes to Die For.
Best Eyelash Growth Product 2017. Sure, every lady wants show-stopping lashes to bat, but do you really want to shell out hundreds of dollars for products you know nothing about? And that's not the only downside when shopping for beauty products. Did you know that synthetic lash growth ingredients like bimatoprost can make you blind?