Abstract: Spectacles for reducing glare due to oncoming traffic while driving at night. The spectacles include a mask or filter that blocks light from entering the wearer's eyes when the source of light is on the opposing side of the highway. The mask may either be a part of the lenses of the spectacles or supported in front of the spectacle lenses by means of a “clip-on” device. If a perpendicular reference line is drawn on the lenses that passes through the optical center of the lens, the mask covers the portion of the lens between ˜225° and 15° with respect to the perpendicular (or the mirror image on British-type highways), or, with reference to the face of a clock, the portion of the lens between 7:30 and 12:30. The mask can be opaque, or it can be a low transmissivity filter (transmissivity ˜10%) or a notch filter that passes only red light. The angle from which oncoming light can be blocked my be changed by a slight rotation of the wearer's head.

Abstract: Spectacles for reducing glare due to oncoming traffic while driving at night. The spectacles include a mask or filter that blocks light from entering the wearer's eyes when the source of light is on the opposing side of the highway. The mask may either be a part of the lenses of the spectacles or supported in front of the spectacle lenses by means of a “clip-on” device. If a perpendicular reference line is drawn on the lenses that passes through the optical center of the lens, the mask covers the portion of the lens between ˜225° and 15° with respect to the perpendicular (or the mirror image on British-type highways), or, with reference to the face of a clock, the portion of the lens between 7:30 and 12:30. The mask can be opaque, or it can be a low transmissivity filter (transmissivity ˜10%) or a notch filter that passes only red light. The angle from which oncoming light can be blocked my be changed by a slight rotation of the wearer's head.

Abstract: In order to detect the identification marks on an exposed transparent card in a stack of similar cards, the identification marks on the exposed card are illuminated by polarized light that is incident at an angle greater than the polarizing angle of the transparent material of the cards. The high angle of incidence and the polarization of the incident light reduce the transmission of light through the exposed card, and thereby reduce the illumination and probability of detection of identification marks on a card adjacent the exposed card.