Silhouette Aviator model 8606 with the now typical pilot shape, came from American helicopter pilots. They valued the large lenses - primarily on account of their ability to provide good shielding from sunlight. The high temple placement creates a face lengthening effect, the trapeze-shaped lenses allow every facet of the chin to be shown to its advantage. Regardless of whether the face shape is long, round or broad, the drop-shaped lenses fit in perfectly with the different face shapes.