Engineer Helmet

In the scene where the engineer ascends into his pilot's seat , the helmet is mounted . The eyes of the engineer don't fit the eyes of the helmet , the helmet seems thin and a little too big for his head , the eyes of the mask do not fit on the eyes of the engineer , it seem that there is a space between ( more than wearing sun glasses ). In the first scene , where they pull off the mask , if you mark the position of the mask's eyes , after the mask is removed , the eyes are way down at the cheek bone . In the pilot seat scene you can get a glimpse of the back of the helmet , the eyes don't seem to be extended inward. Thus how can the engineer see ? His field of view should be narrowed down and impractical for combat , exploring , running from aliens and such.