Eyepatch

An eyepatch, sometimes referred to as an 'eye pad, is a type of patch that is worn on a single eye. It either comes as a cloth patch attached around a string or a bandage. They are normally worn due to an injury to the eye that resulted in either its amputation or it simply being blinded. However, they were also used even in instances where the eye was not actually blind as a means of eye protection, such as in dangerous occupations like blacksmith work, due to sparks. Sailors and pirates during earlier eras, as well as pilots during the early 20th century also used them, besides as an aftermath for injuries, as a means to adjust quickly to environments that were lacking of visibility, especially when time was precious, such as during nighttime bombing raids for pilots and working below decks on a ship. Due to an advancement in technology, however, eyepatches used for this purpose were very rare.

Usage
The legendary soldier, Big Boss, wore an eyepatch on his right eye as a result of Operation Snake Eater. During Volgin's torture of him, Big Boss received a muzzle burn that blinded him in his right eye, which also destroyed the corona of his eyes, while intercepting a bullet that was meant for Tatyana/EVA, after her cover was blown.

One of the Les Enfants Terribles children, Solidus Snake, wore an eyepatch on his left eye, as a result of his eye becoming injured as a result of his Harrier aircraft being shot down by Raiden, with assistance from Solid Snake and Otacon, during the 2009 Big Shell Incident.

Solid Snake wore the Solid Eye, a device similar in appearance to an eyepatch, on his left eye, in order to aid in his mission to stop Liquid Ocelot in 2014.

Although not an eyepatch, Raiden utilized a cloth to cover his left eye, after a fight with Samuel Rodriguez resulted in his eye being injured and amputated, in 2018.