Photic sneeze reflex
Photic Sneeze Reflex
The Photic Sneeze Reflex (pronounced: /ˈfoʊtɪk ˈsniːz ˈriːfleks/), also known as ACHOO syndrome (Autosomal Dominant Compelling Helio-Ophthalmic Outburst), is a condition characterized by sneezing in response to exposure to bright light, particularly sunlight. The term "Photic" is derived from the Greek word "phōs" meaning "light", and "sneeze reflex" refers to the involuntary action of sneezing.
Description
The Photic Sneeze Reflex is a genetic quirk that affects between 18% to 35% of the population. It is an autosomal dominant trait, which means that it can be passed down from one generation to the next. The exact cause of this reflex is not fully understood, but it is believed to be due to a confusion of signals in the trigeminal nerve, which is responsible for facial sensation and motor control.
Symptoms
The main symptom of the Photic Sneeze Reflex is uncontrollable sneezing in response to sudden exposure to bright light. This can occur when stepping out into the sunlight from a dark room, or when looking at a bright light source. The number of sneezes can vary from person to person, but it typically ranges from one to several sneezes in a row.
Related Terms
- ACHOO syndrome: An acronym for Autosomal Dominant Compelling Helio-Ophthalmic Outburst, another name for the Photic Sneeze Reflex.
- Trigeminal nerve: The nerve believed to be responsible for the Photic Sneeze Reflex.
- Autosomal dominant: A mode of genetic inheritance by which the Photic Sneeze Reflex is passed down.
See Also
References
External links
- Medical encyclopedia article on Photic sneeze reflex
- Wikipedia's article - Photic sneeze reflex
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