High quality 3D eye patches for the treatment of lazy eye amblyopia, strabismus, post surgery and double vision. Protect sensitive eye area and reusable. It's light weighted, breathable and comfortable. The convex shape helps to avoid pressure to eyeball. The eye patch blocks about 90% of the light but will block more after wearing it for a few times because the leather will be naturally soften. The size of the eye patch 4"(10 cm) X 1.8" ( 4.5 cm). The lengths of the straps 24" and 26" (from the buckle to the end). The lengths required for proper fit should be 1.5" or 2" longer then the head size. Please let me know if you need shorter or longer straps. This eye patch is hand crafted from 100% premium veg tan leather. Lining is made of soft lambskin or deerskin leather. The eye patch is covered with nontoxic eco leather finish. If there are any issues with the item, please let me know and I will be happy to help. Real leather, like any natural material, may have small defects that are inherent to the material. These natural defects can include tiny marks, scars, and variations in texture or color. These natural marks are a sign of the leather's authenticity and should not be viewed as a defect in the product.