An interview to three detectives

Three detectives are applying to get the promotion, the interview consisted in detecting what's suspicious about the man shown in a photo.
The first one says: This man has only one ear!
The Sheriff, a little annoyed says: You dumb motherfucker, it's a profile photo. And asks for the next one.
The second one says: This man has only one eye!
The Sheriff, amused says: How can you be this useless? It's a profile photo! - looks to the third one and says- I hope you aren't as idiot as your colleagues.
The third one looks at the photo and says: This man is using lenses!
The sheriff, impressed says: Well, I didn't know that, let me check it.- And leaves the room.
Half an hour after he comes back and says: Yes, very good, he was using lenses, how did you guessed it?
The third man responses: Well, only having one ear and one eye who the fuck is going to wear glasses?