These are unique glasses that use a reflection prism to allow you to see 90° directly below you. You can see almost directly below you while facing forward, and you can see your hands while lying on your back. This is convenient for operating smartphones, watching videos, reading, and playing mobile games while lying in bed or on a sofa. It's also a useful item for those who cannot move their bodies due to injury or those who are hospitalized. It allows for a comfortable posture that is gentle on the neck and arms, reducing strain. If the size is right, they can be worn over eyeglasses. Size: Approximately 15cm wide x 4.5cm high Approximately 20cm from the tip of the lens to the end of the temple (when the temple is open) Material: Not specified (rubber material) Will be shipped in simple packaging.