Hernia prosthesis with marking means

A prosthesis comprising a first textile made of a first biocompatible material, said first textile having a first generally plane geometric shape that defines a first face and a second face opposite the first face, said first face including a central region surrounding a center on said first face, said central region having a surface area smaller than a surface area of said first face, and a second open-worked textile made of a second biocompatible material, said second open-worked textile positioned on the first face of the first textile, said second open-worked textile having a second generally plane geometric shape including an outer perimeter situated inside the central region of the first face of the first textile and designed to indicate both the center and a longitudinal direction of the first face of the first textile, said second open-worked textile including a part absent of material, the part located on the center of the first face of the first planar textile.