Prices are checked against each store and labelled with when.
It checks today's price at every store, compares the alternatives and answers in about a minute.
Green Sleep Prep Glasses are blue-light-blocking glasses meant to be worn in the evening, about two hours before bed and whenever a screen is in view after dark. They use deep-green lenses that the maker says block 100% of the blue light linked to poor sleep, and they avoid the deep-red tint common to most nighttime blockers, so the world stays closer to its normal colors. Three shapes are offered: a curve-wrap vintage Easy Rider, a box-wrap square, and a wrap that fits over prescription glasses. They suit people who spend evenings on screens and want a less harsh alternative to red lenses, though the maker's sleep and color-research claims are its own and not independently verified here.
In stockReturn policy
These sleep prep glasses have muted garden-green lenses that block blue light from screens in the evening. They are made to be worn after dark, including about 2 hours before bed and whenever a screen is in view. Unlike red-tinted blue blockers, the green lenses don't make everything look red.
The lenses block 100% of 460 nm blue light, the wavelength tied to circadian rhythm and sleep. They also block 100% of 400 to 440 nm blue light and reduce brightness. The lenses may look dark at first.
The wrap-around frames block light from the top and sides. They come in a curve-wrap Easy Rider style and a square box-wrap style. A wrap-around style that fits over your own glasses is also offered. The soft nose bridge is built in.
