Blue Light Blocking Sleep Glasses These dark red glasses, contain a blue and green light filter, do not let it through and block 100% of blue and green light. Red glasses are especially suitable before sleep, as they block wavelengths below 570nm, and it is precisely these wavelengths that affect a person's circadian rhythm and disrupt sleep. Red glasses are designed for evening/night use, ideally 90 minutes before bedtime. They are especially suitable when working on a computer, phone or watching TV. It also protects against blue light from LED bulbs (indoor/outdoor lighting). By wearing blue and green light-blocking glasses before bed, you can improve your sleep and your health. Thanks to the rounded shape of the glasses, blue light does not reach the eyes from the sides or around the nose. Ventilation holes on the feet of the goggles prevent fogging. Thanks to their shape, the glasses can also be worn over most common prescription glasses. Red glasses are not intended to be worn for long periods of time. Do not use red glasses when driving motor or non-motor vehicles. Technical parameters: block blue and green light: 100% Dimensions: 16.5cm x 5.5cm x 12.7cm   Colour: Red Type: PC goggles Lens colour: red Material: Plastic Dimensions: 16.5 cm x 5.5 cm x 12.7 cm Material Type: Plastic