Eyeglasses including video displays that may be pivoted forwardly and outwardly to an open position for viewing through the lenses of the eyeglasses, and may be folded rearwardly and inwardly to a stored position for retention by the temple members of the eyeglasses when not in use, are described. The surgical device employs or affixes the surgical sensor on or about a surgical device for detecting electromechanical characteristics during the surgical procedure. The weather-impact model can comprise at least one of an empirical scoring matrix, a weather indices template, and a proxy model conditions template. The power interface is configured for connecting to the hard disk drive. A retainer operatively couples to the engagement member and is positioned to prevent disengagement of the engagement member from the hub in the non-shielding position, and enables removal of the hub from the needle shield by disengaging the engagement member from the hub when the needle shield moves to the shielding position.