Autosomal-dominant Compelling Helio-Ophthalmic Outburst syndrome is the need to do what when seeing the Sun?

The autosomal dominant compelling helioophthalmic outburst syndrome is characterized by an uncontrollable need to sneeze when seeing the sun. This syndrome causes individuals to experience a reflexive response where exposure to sunlight triggers sneezing. The exact reason behind this phenomenon is still not completely understood, but it is believed to be related to the close anatomical proximity between the optic nerve and the trigeminal nerve, which controls sneezing. Therefore, sneezing becomes a reflexive response when light stimulates the optic nerve, leading to an involuntary sneeze.