Possible Clues:

• Pertaining to the part of the eye sensitive to light
• Pertaining to light-sensitive part of eye
• True about metal being of light-sensitive tissue
• Membrane's material with metal lining
• Genuine money's found inside of lining tissue
• Relating to part of the eye
• Of the back layer of the eye
• Metal in concrete touching on part of the eye
• Membrane's genuine but reinforced with metal
• Like part of eye stored in secret in a lab