The Solid Eye was a device invented by Otacon (with the help of Sunny) resembling an eye patch. It was used by Solid Snake in his final mission to eliminate Liquid Ocelot. The Eye appeared to be similar to a plastic eye patch, with the text "SOLID EYE SYSTEM" and a serial number appearing on the front and a small camera lens below the text. The Solid Eye was destroyed along with Snake's OctoCamo Sneaking Suit in the microwave tunnel within Outer Haven.