Filter glasses (74, 200) for use by an observer of a stereoscopic digital display system that displays stereoscopic images including first-eye images and second-eye images on a display surface, comprising: a first-eye filter having a front surface facing the display surface and an opposite back surface and having transmission characteristics that substantially transmit light from the first-eye images and block light from the second-eye images; a second-eye filter having a front surface facing the display surface and an opposite back surface and having transmission characteristics that substantially transmit light from the second-eye images and block light from the first-eye images; a frame (62, 210) having arms and rims, the rims having a rear portion facing the eyes of the observer, when the filter glasses (74, 200) are positioned on the head of the observer, the arms extending from the rims towards the ears of the observer, when the filter glasses (74, 200) are positioned on the head of the observer, the first-eye filter and the second-eye filter being mounted to the rims of the frame (62, 210), the frame (62, 210) being adapted to position the first-eye filter in front of the observer's first eye and to position the second-eye filter in front of the observer's second eye, the front surfaces of the first-eye filter and the second-eye filter being oriented at a tilt angle (θ) of at least 5 degrees relative to the rear portion of the rims so that light from the display surface that is reflected from the first-eye filter and the second-eye filter is directed upwards in a direction over the heads of other observers that are seated in front of the observer. a first-eye filter having a front surface facing the display surface and an opposite back surface and having transmission characteristics that substantially transmit light from the first-eye images and block light from the second-eye images; a second-eye filter having a front surface facing the display surface and an opposite back surface and having transmission characteristics that substantially transmit light from the second-eye images and block light from the first-eye images; a frame (62, 210) having arms and rims, the rims having a rear portion facing the eyes of the observer, when the filter glasses (74, 200) are positioned on the head of the observer, the arms extending from the rims towards the ears of the observer, when the filter glasses (74, 200) are positioned on the head of the observer, the first-eye filter and the second-eye filter being mounted to the rims of the frame (62, 210), the frame (62, 210) being adapted to position the first-eye filter in front of the observer's first eye and to position the second-eye filter in front of the observer's second eye, the front surfaces of the first-eye filter and the second-eye filter being oriented at a tilt angle (θ) of at least 5 degrees relative to the rear portion of the rims so that light from the display surface that is reflected from the first-eye filter and the second-eye filter is directed upwards in a direction over the heads of other observers that are seated in front of the observer. the rims having a rear portion facing the eyes of the observer, when the filter glasses (74, 200) are positioned on the head of the observer, the arms extending from the rims towards the ears of the observer, when the filter glasses (74, 200) are positioned on the head of the observer, the first-eye filter and the second-eye filter being mounted to the rims of the frame (62, 210), the frame (62, 210) being adapted to position the first-eye filter in front of the observer's first eye and to position the second-eye filter in front of the observer's second eye, the front surfaces of the first-eye filter and the second-eye filter being oriented at a tilt angle (θ) of at least 5 degrees relative to the rear portion of the rims so that light from the display surface that is reflected from the first-eye filter and the second-eye filter is directed upwards in a direction over the heads of other observers that are seated in front of the observer.