Spectrum Technologies' Orion Night Vision and Delta Thermal Imaging Filters eliminate night blindness and/or significantly reduce eye fatigue. These optical electronic imaging filters represent a technological advancement for night vision, specialized military applications and covert law enforcement activities. These optical filters "selectively regulate" individual wavelengths of light to minimize the sensations of overwhelming brightness and blindness caused by black/white or phosphorous "green screens." These filters also improve image sharpness (visual acuity) while reducing eyestrain. Delta Optical Filters and Orion Night Vision Optical Filters can be individually fabricated for specialized thermal imaging or night vision devices and are obtainable in customer-specified sizes, shapes and quantities.