So, at 275mph... How do they keep their eyes from ripping out of their face? 
Good question actually... They don't need to worry about their eyes ripping out, but they do need to be worried about particles of debris in the air. They have nictitating membranes that they flick shut briefly to protect their eyes as they see bits of debris in the air about to collide with their eyes. They cannot just leave them shut in a dive because while the membrane is somewhat transparent they cannot see through it. They also have thicker (more viscous) fluid on their eyes so they don't "water" like ours would at that speed.
In addition, they have small nobs of bone in their nares (nostrils) that disrupt the airflow and allow them to breathe at that speed.
Another amazing thing about that speed is that at the bottom of their stoop (dive) they're pulling out and experiencing 25-35 G's. The fact that they can live through that is amazing in itself, but the fact that they can still move and maneuver under those conditions (often only a few feet above the ground) is insane. There's really nothing else that compares to it on the planet. Imagine how helpless a human is comparatively under only a few (>10) G's...
