Solid Eye (technology)

The Solid Eye is a device invented by Otacon (with the help of Sunny) resembling an eye patch. It is used by Solid Snake in his final mission to eliminate Liquid Ocelot.

The Solid Eye has both night vision and thermal vision, and can also be used in conjunction with a radar to be used as a sonar.

Appearance
The Eye appears similar to an eye patch, with the text "SOLID EYE" and a serial number appearing on the front and a small camera lens over the text. It should be noted that the Solid Eye combined with Snake's bandanna and rapid age make Snake look similar to his "father", Big Boss (though Big Boss wore his eye patch on his right eye whereas Solid Snake wears the Solid Eye on his left)

Name
The name of the Solid Eye was taken directly from the Solid Eye peripheral used with Metal Gear Acid 2. Apparently, Hideo Kojima took the name from the peripheral without even telling the producer of MGA2 who was "surprised" when he saw it in the original TGS trailer.