Practical light-blocking design: This eye patch, specially designed for glasses, covers both eyes, protecting them from light damage and helping to alleviate eye problems. The self-adhesive eye patch fits the glasses perfectly and stays in place. The black eye patch is easy to wear, saving training time. Breathable fabric: This eye patch is made of soft, lightweight, and breathable skin-friendly fabric, suitable for all skin types. It is comfortable to wear without feeling stuffy or pulling on the glasses. The moderate thickness prevents contact with the eyelids. Easy to use: You can cover the lenses to block vision in the amblyopic eye. The eye patch has two covering methods: monocular or binocular. Follow your doctor's instructions regarding covering method and duration. Product content: You will receive 12 eye patches. Each eye patch measures 2.1 x 4.2 inches / 5.5 x 12 cm, suitable for most adult glasses. The quantity is sufficient for daily use and replacement. Versatile: This black eye patch is particularly suitable for amblyopia, strabismus, and amblyopic eye training, such as during or after cataract surgery, when reading, shooting, or sleeping.