[ELI5] what is the chemical/biological reaction that makes people sneeze when looking into the sun

Question

[ELI5] what is the chemical/biological reaction that makes people sneeze when looking into the sun

In: Chemistry

Answer 1

Reflexive sneezing induced by light, and sunlight in particular, is estimated to occur in 18 to 35 percent of the population and is known as the photic sneeze reflex (PSR) or the ACHOO (autosomal dominant compulsive helio-ophthalmic outbursts of sneezing) syndrome.