Product parameters:Material: PlasticDimensions: temple length approx. 145 mm, width approx. 68 mmColor: BlackQuantity: 1 pieceScope of delivery:1 x grid glassesProduct description:1. VERSATILE USE: The pinhole glasses are suitable for the near and far range and can be used for refractive ametropia such as nearsightedness, farsightedness, astigmatism (astigmatism) or presbyopia. In summer they can also be used as sun glasses.2. EYE MUSCLE TRAINING: The glasses are often used for individual, naturopathic eye training / eye gymnastics. It can be worn during training, but also in everyday life when reading, working on the PC or on the go.3. SUITABLE FOR RELAXATION: With a significantly reduced incidence of light, the pinhole glasses are used for visual relaxation / recovery of the eyes.4. THE PRINCIPLE BEHIND: By changing the light rays falling in the eye, the image on the retina in the eye can be optimized in a point-like manner. The subjective impression is a sharper picture.