People in this topic, get off your high horse. This could be a legitimate question from someone that is unfamiliar with the intricacy of Metal Gear Solid. Kojima doesn't exactly make it easy with his desire to continuously have Big Boss go by Snake. That's your answer by the way, TC. The character in MGS4 is Solid Snake while the character your seeing in MGS5 is Big Boss(Naked Snaked).
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ummmm i think hes talking about the solid eye in MGS4. its not a eye patch its a machine that goes over his eye so he can see in night vision and it also displays a radar. pay no attention to every one else