1. A method, comprising: establishing a control link between a device and a visual control circuit, the visual control circuit comprising an image sensor disposed at or adjacent a visual feature, which is substantially proximate to the image sensor to form a control point; receiving an image by the image sensor; determining one or more eye-related characteristics including: deriving an eccentricity-related value based on major and minor axes defining an ellipse associated with an eye, and comparing the eccentricity value to an eccentricity threshold associated with a line of sight; evaluating the image to determine whether the eye is oriented substantially toward the control point; determining whether a control action is intended, and, if the control action is intended, deriving the control action; and causing initiation of the control action via the control link.