Metal Gear Rising: Revengeance - Image #903,411

iirc, in-game explanation for this was Doktor didn't have time to construct a fully functioning eyeball and simply laced the fabric with nanomachines and microsensors. Ends working better than an actual eye as it has a better FOV and can process more info than a regular eye.

Eh, you shouldn't expect logic playing a Metal Gear game in general!