Reflex, photic sneeze
A disorder, also known as the achoo syndrome, characterized by nearly uncontrollable paroxysms of sneezing provoked in a reflex fashion by the sudden exposure of a dark-adapted subject to intensely bright light, usually to brilliant sunlight. The number of successive sneezes is usually 2 or 3, but can be up to about 40. (The condition was once called the helio-ophthalmic outburst syndrome.) The photic sneeze reflex is much more common than has been generally recognized. In one study it was found in 23% of medical students. The syndrome is one of the most frequent of all known genetic traits. It is inherited in an autosomal dominant manner, affecting males and females alike, who have a 50:50 chance of passing the achoo gene to each of their children who will have the disorder. The syndrome was first described in 1978. One physician reported that he had suffered from photic sneezing for over 20 years and, having just learned of the existence of the syndrome, found that the "symptoms are more easily tolerated if you can put a name to them, even if that produces only an illusory understanding of their significance." He commented on the potential hazards of photic sneezing if it occurs while one is driving a car on a sunny day. Tunnels and shadows created by tall buildings and forested terrain can induce sneezing upon re-entering the bright sunlight. References: {{}}WR Collie, RA Pagon, JG Hall, MHK Shokeir: ACHOO syndrome (helio-ophthalmic outburst syndrome). Birth Defects Orig. Art. Ser. XIV(6B): 361-363, 1978. (The original description of the syndrome.) EW Benbow: Practical hazards of photic sneezing. Brit. J. Ophthal. 75: 447, 1991. (The physician who discovered he had the syndrome.)

Medical dictionary. 2011.

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  • Photic sneeze reflex — is a genetic autosomal dominant trait, which causes sneezing when exposed suddenly to bright light, possibly many times consecutively. It is also referred to as photic sneeze response, sun sneezing, photogenic sneezing, the photosternutatory… …   Wikipedia

  • Photic sneeze reflex — A disorder, also known as the achoo syndrome, characterized by nearly uncontrollable paroxysms of sneezing provoked in a reflex fashion by the sudden exposure of a dark adapted subject to intensely bright light, usually to brilliant sunlight. The …   Medical dictionary

  • Sneeze — A sneeze (or sternutation) is a semi autonomous, convulsive expulsion of air from the lungs, most commonly caused by foreign particles irritating the nasal mucosa. Sneezing can further be triggered through sudden exposure to bright light, a… …   Wikipedia

  • Reflex — A reaction that is involuntary. The corneal reflex is the blink that occurs with irritation of the eye. The nasal reflex is a sneeze. * * * 1. An involuntary reaction in response to a stimulus applied to the periphery and transmitted to the… …   Medical dictionary

  • Photischer Niesreflex — Der photische Niesreflex (v. griech.: φῶς phōs, Gen. φωτός phōtos „Licht“) beschreibt das Phänomen, dass manche Menschen niesen müssen, wenn sie plötzlicher Helligkeit ausgesetzt sind (z. B. Sonnenlicht). Inhaltsverzeichnis 1 Verbreitung 2… …   Deutsch Wikipedia

  • ACHOO — Réflexe photo sternutatoire Le réflexe photo sternutatoire (ou ACHOO, rétro acronyme de Autosomal dominant Compelling Helio Ophthalmic Outburst) est un phénomène physiologique où le sujet éternue lorsqu’il est exposé à une forte lumière (ou aux… …   Wikipédia en Français

  • Reflexe photo-sternutatoire — Réflexe photo sternutatoire Le réflexe photo sternutatoire (ou ACHOO, rétro acronyme de Autosomal dominant Compelling Helio Ophthalmic Outburst) est un phénomène physiologique où le sujet éternue lorsqu’il est exposé à une forte lumière (ou aux… …   Wikipédia en Français

  • Réflexe photo-sternutatoire — Le réflexe photo sternutatoire (ou ACHOO, rétro acronyme de Autosomal dominant Compelling Helio Ophthalmic Outburst) est un phénomène physiologique où le sujet éternue lorsqu’il est exposé à une forte lumière (ou aux rayons solaires dans certains …   Wikipédia en Français

  • Fotischer Niesreflex — Der photische Niesreflex (v. griech.: φῶς phōs, Gen. φωτός phōtos „Licht“) beschreibt das Phänomen, dass manche Menschen niesen müssen, wenn sie plötzlicher Helligkeit ausgesetzt sind (z. B. Sonnenlicht). Inhaltsverzeichnis 1 Verbreitung 2… …   Deutsch Wikipedia

  • List of reflexes (alphabetical) — A list of reflexes in humans. *Accommodation reflex coordinated changes in vergence, lens shape and pupil size when looking at a distant object after a near object.*Acoustic reflex or stapedius reflex or attenuation reflex contraction of the… …   Wikipedia

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