The Photic Sneeze Reflex (PSR) is a neuro-ophthalmological phenomenon that causes people to sneeze in response to light. The Autosomal Dominant Compelling Helio-Ophthalmic Outburst syndrome is another name for the PSR. PSR is hypothesized to be produced by a shift in light intensity that begins at the beginning of light exposure and worsens with lacrimation or nasal discomfort.
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