TruFocals achieve continuous, and virtually instantaneous, adjustable focus by emulating the focusing action of the youthful human eye.
Nearest each eye is a lightweight (approximately 6 gm!), yet robust, adjustable focus assembly. This consists of a precision polycarbonate ophthalmic lens, together with a transparent polymer membrane. The pocket between them holds a small quantity of an inert and crystal clear optical fluid. As the wearer moves a slider on the bridge, the lens pivots, rapidly displacing a small quantity of fluid and thereby “inflating” the membrane. This “inflation” changes the focal length of the assembly, mimicking the natural way in which adjustable optical ADD occurs in the youthful human eye.
Two outer (Z80.1 compliant) ophthalmic lenses provide the wearer’s distance correction: sphere, cylinder and, if needed, prism. These lenses can be removed for cleaning ...or interchanged with appropriately tinted Rx lenses for contrast enhancement or protection from glare.
“Until I started wearing TruFocals, I thought that I was satisfied with bifocals. But it turns out that there are a great many awkward seeing situations that I was simply living with that are no longer awkward.”- SE
