IMPROVE COMFORT AND PERFORMANCE - Spectra479 blue light filter clip on glasses will turn your prescription and reading glasses into effective blue light blocking glasses for all day digital screen use. Reduce eyestrain, prevent headaches, and relax your eyes resulting in greater comfort and performance | UNIVERSAL FIT - Each pair of clip on blue light lenses comes with a hard plastic case, a combination microfiber pouch and cleaning cloth, and PDF quick start guide with simple instructions. The computer glasses are ultra lightweight yet durable, and the bright, clear lenses are almost unnoticeable to your eyes | PROVEN EFFECTIVE - Our computer glasses for kids and adults are tested to greatly reduce blue light exposure all day long. Theses lenses greatly surpass the UV400 standard. Our blue light glasses for men and women come with a 90 day replacement and 1 year defect manufacturers warranty | DECREASE HARMFUL EFFECTS OF SCREEN TIME - Easily use your Biorhythm Spectra479 blue light blocking glasses with your existing prescription or reading glasses. Suitable as blue light blocking glasses for kids, as computer reading glasses, gaming glasses for kids and teens | ESSENTIAL SCREEN TIME ACCESSORY - Our men's and women's blue light glasses are an ideal gift for anyone that spends long periods of time in front of a screen. Improve your comfort and performance by wearing computer glasses specially designed for this purpose