Abstract: This patent application discloses the use of specialized optical filters or similarly functional devices to improve the utility of Night Vision Devices (NVD) by placing these specialized filters in the internal optics train of the eyepiece such that the undesirable illumination of the user's face is reduced while at the same time maintaining the peripheral vision of the user and concomitantly reducing the dark adaptation time of the user when transitioning from the NVD to the unaided eye.

Abstract: This patent application discloses the use of specialized optical filters or similarly functional devices to improve the utility of Night Vision Devices (NVD) by placing these specialized filters in the internal optics train of the eyepiece such that the undesirable illumination of the user's face is reduced while at the same time maintaining the peripheral vision of the user and concomitantly reducing the dark adaptation time of the user when transitioning from the NVD to the unaided eye.

Abstract: A light-altering filter for use by military and law-enforcement personnel in lowlight environments is disclosed. The filter can be placed between a lit computer monitor screen and the face of the computer user. Light coming from the monitor screen is modified by the filter so that the night vision capabilities of the computer user are not adversely affected, and splash-back reflective illumination of the user is minimized.

Abstract: An eyecup and optical filter appliance is disclosed and claimed. The appliance can be attached to a vision aid device such as an active or passive night vision device, a telescopic sight for a weapon, or the like. The appliance includes a tubular body, an optical filter mounted within a tubular body end cap, and means for mounting the appliance to the vision-aid device. The tubular body includes a main body and an eyecup sized and shaped to mold closely to that portion of the users face surrounding his eye, so that light is not reflected from the user toward his opponent.

Abstract: A color enhancing filter is disclosed which is especially adapted for use to improve eye vision under all lighting environments. Lighting environments include extreme lighting environments, such as, low level and brightly illuminated light environments. The filter is supported by an adapter ring. It also has a filter element which passes impinging light wavelengths as follows:______________________________________ Light Wavelength (nm) % Incident Light Transmitted ______________________________________ 400 25 450 12 470 08 500 04 520 07 570 50 600 87 700 90 ______________________________________A method of improving human eye vision utilizing the filter is also disclosed. The method includes causing various types of light to travel to a subject and to be reflected or transmitted from the subject to a light-amplification device or the human eye.

Abstract: A color correction filter is disclosed, which is especially adapted for use in underwater photography. The filter has a transparent element which passes impinging light wavelengths as follows:______________________________________ % incident light Light wavelength, nm transmitted ______________________________________ 400 25 450 12 470 8 500 4 520 7 570 50 600 87 700 90 ______________________________________A method of taking underwater photographs utilizing this filter is also disclosed. The method includes causing daylight to travel through seawater to the subject, and reflected light from the subject to the camera, over a total distance of less than about 50 feet.