What is a photic sneeze response?

1/4 of the population has photic sneeze reflex. It just so happens that I have it too. It is when you look into a bright light and sneeze. I usually sneeze twice when it happens but it's probably different for other people. My grandfather has it so I am wondering if it runs through the family. When photic sneeze reflex occurs, you close your eyes while sneezing which may result in having car or plane accidents if you are the driver. I suggest you wear sunglasses. This probably won't help though, it doesn't for me.

Reeze