Abstract: An elastic constraint system for a pair of eyeglasses includes at least one inextensible flexible wire provided with two wire terminals to be engaged with two distinct portions of an eyeglasses front frame or temple bars, at least one of the wire terminals being provided with an elastic element mounted preloaded and acting in opposition to a tensioning of the inextensible flexible wire.

Abstract: An elastic constraint system for a pair of eyeglasses includes at least one inextensible flexible wire provided with two wire terminals to be engaged with two distinct portions of an eyeglasses front frame or temple bars, at least one of the wire terminals being provided with an elastic element mounted preloaded and acting in opposition to a tensioning of the inextensible flexible wire.

Abstract: A rangefinder is incorporated into a pair of eyeglasses or sunglasses. A pair of holographic images, one including a distance-measuring scale and the other including a pointer, are projected separately into the eyes of a user, such that the images become superimposed over the user's field of view. As the user focuses on a distant object, the user's eyes move, and such movement causes the apparent position of the pointer, relative to the scale, to change. When the user has focused on the object, the pointer indicates a value which represents the distance of the object. The rangefinder can be used by golfers, hunters, surveyors, or the like, to provide a hands-free method of measuring distance.

Abstract: The invention is a band hinge for flexibly connecting the temple member to the lens frame thereby preventing damage from inadvertent pressure or cyclic wear. A distinguishing feature of the invention is the use of a band hinge that holds together the temple member and the lens frame without the use of a pin or screw hinging mechanism. The invention allows for a high degree of freedom of movement for the temple member with respect to the lens frame which will prevent most forms of damages to the glasses from these types of events.