Metal Gear Wiki
Metal Gear Wiki
This article is about Solid Snake's eyewear. You may be looking for the Solid Eye Tobidacid bundled with Metal Gear Acid 2.

The Solid Eye System was an optoelectronic 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.


Guns of the Patriots Incident[]

See also: Liquid Sun, Solid Sun, Third Sun, Twin Suns, Old Sun, and Naked Sin/Naked Son

The Solid Eye appeared similar to a plastic eye patch, with text of the device name and serial number printed on the front, with a small camera lens positioned below. The Solid Eye was destroyed along with Snake's OctoCamo Sneaking Suit in the microwave tunnel within Outer Haven.

Solid Eye view

A view taken from the Solid Eye, showing the identification and weapons of observed soldiers.

The Solid Eye combined ENVG (Enhanced Night Vision Goggles) light amplification and imaging technology, and also allowed for binocular functionality (though not simultaneously). In addition, the NV capability could also reveal things that normally wouldn't be seen, such as footprints, thus allowing Snake an easier time predicting enemy route patterns and reacting accordingly.

The Solid Eye can detect in body temperature, heart rate and sweat secretion to calculate a soldier's physical and emotional state. Its camera vision utilized the fish-eye perception.[1] Snake's model also acted as a corrective lens for far-sightedness. When heavy artillery such as tanks enter the field of view it displayed their specifications and armaments.

A similarly designed toy called Tobidacid was known to exist by Solid Snake, apparently having owned one at childhood, though Otacon was unaware of it.

World Marshal Incident[]

See also: Raid at World Marshal, Ambush in Africa, Abkhazian Coup, Investigation in Guadalajara, Raid in Denver, and Operation Tecumseh
Warning: The following information is from outside Hideo Kojima's core "Metal Gear Saga." Its canonicity within the continuity is disputed, therefore reader discretion is advised.[?]

Raiden made use of a retractable dual Solid Eye System, which was incorporated into his headgear and worked in conjunction with his visor; the eye pieces were labeled with the text "caution /// dual solid eye system." By 2018, he had replaced the dual system with a single retractable eyepiece, labeled as an "artifical compound eye unit."

Non-"Metal Gear Saga" information ends here.

Behind the scenes[]

The name of the Solid Eye is taken directly from the Solid Eye Tobidacid peripheral used with Metal Gear Acid 2. Apparently, Hideo Kojima took the name from the peripheral without telling the producer of Metal Gear Acid 2, who was "surprised" when he saw it in the original TGS trailer. The name is also a play on the term "naked eye," referring to unaided human visual perception, as well as being the partial namesake of Naked Snake.

Mgs4 logan hayter

David Hayter wearing the Solid Eye in a TV spot cutscene.

The Solid Eye's writing on the front of the eye says:

OTC • 0017/02"

A similar device appears in Metal Gear Solid: Peace Walker, called the Sonic Eye, which allows Big Boss to "sense" an enemy's path and location through soundwaves. In addition, the Analyzer has features similar to that of the Solid Eye, such as analyzing soldiers and the armaments and weaknesses of vehicles, including the classification and troop strength of the latter.

The Solid Eye also appeared on the official series website under Versus Battle, where it competed with FaceCamo.

Detects Everything on the Battlefield
Microwave Tunnels
Developed by Otacon and Sunny, Snake’s Solid Eye allows him to see, assess, & analyze nearly anything, near or far, day or night
―Solid Eye description on Versus Battle

Dummied code in the PC version for Ground Zeroes indicated that the Solid Eye was planned to be in the game.

The Solid Eye is an equippable item for the character Gabriel Belmont in Castlevania: Lords of Shadow, which can be unlocked after beating the game.

Notes and references[]

  1. ^ This is made especially apparent while Liquid is taunting Snake at the end of Liquid Sun.