**Photoptarmosis**

From wikipedia: Photic sneeze reflex
> The photic sneeze reflex (also known as photoptarmosis, Autosomal
> Dominant Compelling Helio-Ophthalmic Outburst Syndrome (ACHOO) and
> colloquially sun sneezing) is a condition that causes variable
> difficulty to control sneezing in response to numerous stimuli, such
> as looking at bright lights or periocular (surrounding the eyeball)
> injection. The condition affects 18-35% of the population, but its
> exact mechanism of action is not well understood.