After waving his hand in front of your face to be met with no reaction, he sighed and looked you over. You were a child soldier who'd joined Eli, you'd then been kidnapped and tortured for a while which resulted in the loss of your vision. Being saved by Snake after he relocated Eli and the kids onto Mother Base. He took his metallic arm and snapped by your ear which resulted in a yelp from you and a relived laugh from him "Alright, we'll just have to get you a guide dog or something."