at minimum.

Other than irritating foreign particles, allergies or possible illness, another stimulus is sudden exposure to bright light - a condition known as photic sneeze reflex (PSR). Walking out of a dark building into sunshine may trigger PSR, or the ACHOO (autosomal dominant compulsive helio-ophthalmic outbursts of sneezing) syndrome as it is also called. The tendency to sneeze upon exposure to bright light is an autosomal dominant