Why can't you keep your eyes open when you sneeze?

It is possible, but not for most people, most of the time. The contractions of the facial muscles that accompany a sneeze include the muscles of the eyelids that control blinking. So while it is impossible for most people to keep their peepers from shutting during the process, some rare folks are capable of it.

Some other comments on the subject:

  • I tried it several times. I got it once, but I was never able to do it again.
  • Yes, it is possible and has happened with many people. Although most cannot, there are some who are able to sneeze with their eyes open.

(see link below)