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.
Eyelash extensions are individual fibers â not a strip of lashes â that are glued, one by one or in small groups, onto your natural eyelashes to enhance the appearance of length and fullness. Most eyelash extensions are made of synthetic fibers, such as nylon, and are bonded using various types of professional glues. Silk is another material used for eyelash extensions. There are even mink eyelashes made of natural fur.