👉 Peridial is a medical term that refers to the space between the skin and the muscles of the eyelid. It acts as a barrier, preventing tears from entering the eye and providing protection against dust, dirt, and other substances that may cause irritation or damage to the eyelids. The peridial area can be divided into two main areas: the outer (outermost) and inner (innermost) peridial layers. The outermost layer is made up of blood vessels and muscle