Problem to be solved: to provide a system which adopts a mask device for treating an eye with a photosensitizing agent, for example, cross-linking treatment.The treatment system 300 positions the mask device 301 on the first and second eyes 1a, 1b, and the rear side 301B of the mask device approaches the face 3, and the front side 301A is located farther from the face.The mask device includes an outer wall 301c defining a chamber 302 extending between the front and rear sides and extending across the first and second eyes.The front side includes a second transparent region 304b that supplies a photoactive light for the first eye to a first section 302a on the first eye 302a and a light activated light for the second eye to a second section 302B on the second eye.The system includes at least one gas source for storing gases different from ambient air and a gas supply system for supplying gas to the chamber.Diagram
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