BPI is the world's largest manufacturer of optical tints that are used by opticians, optometrists and ophthalmologists in tinting, dying, or otherwise coloring clear plastic – especially optical sunglass lenses. BPI also produces lines of therapeutic tints providing UV protection and aiding with problems such as blepharospasms, headaches, retinitis pigmentosa, color blindness, corneal dystrophys, macular degeneration, retinal damage and dyslexia. BPI has specialty tints such as EVA for viewing computer monitors and Solar Dyes for the finest sunglasses. BPI also manufactures laboratory equipment such as tinting instruments, photometers, ultrasonic cleaners, edgers (for edging lenses), gradient lensors (for producing gradation of tint on lenses) and ovens for heat and chemical tempering of glass lenses for safety glasses and eyewear. BPI supports all optical lens and sunglass manufacturers and optical laboratories.