The photic sneeze response is a genetic condition where exposure to bright light, such as sunlight, triggers a reflexive sneeze. It is estimated to affect about 18-35% of the population. The exact cause of this phenomenon is not fully understood.

Bright light

It is possible for some people to experience a phenomenon known as "photic sneeze reflex," where exposure to bright light, such as sunlight, can trigger a sneeze. This reaction is thought to be due to a genetic predisposition.

An involuntary reflex.

Sneezing is a reflex. A reflex is where your body does something automatically and is something that you have no control over. Some people can sneeze with their eyes open, and some people can not.