Patent ID: 7850303
Filing Date: 2010-12-14
Classification: A42B,A61F,G02C

Abstract:
1. A protective shield for mounting in front of a face of a wearer in an as worn orientation, with the shield extending across the eyes and nose of the wearer for use in a specific activity involving a predetermined activity specific line of sight different than a straight ahead normal line of sight, the protective shield comprising: an arcuate lens that, in the as worn orientation, to fully cover the eyes and nose of the wearer, the lens having an optical center and an apex, either or both of which can be on or off the lens, and a lower edge, and further, wherein a front center of curvature and a rear center of curvature, and an optical axis of the lens extends through the front center of curvature of the lens, the rear center of curvature of the lens, and the optical center of the lens; and wherein the optical center of the lens is displaced from the apex toward the predetermined activity specific line of sight other than the normal straight ahead line of sight, to a position that reduces object shift as the wearer shifts gaze from the normal straight ahead line of sight to the activity specific line of sight, wherein the optical axis of the lens is angled horizontally to a median plane by an angle of equal magnitude to a horizontal component of an angle of deviation of the predetermined activity line of sight from the normal straight ahead line of sight.