"Prism glasses for reading books and using smartphones while lying down!" Mechanism: The square mirror (prism) on the front reflects your line of sight downwards by 90 degrees. • Even while lying down and looking at the ceiling, • Your line of sight feels like you're "looking down." These are convenient goods that allow you to comfortably read books, use your smartphone, or watch TV without lifting your neck. Lightweight with a plastic frame. - Color: Black - Type: Reading glasses - Lens Shape: Flat - Frame Material: Plastic - Design: With mirror Thank you for viewing.