Marcus Gunn phenomenon
Marcus Gunn phenomenon (pronounced: mar-kus gun fen-om-e-non) is a rare neurological condition, also known as Marcus Gunn Pupil or Relative Afferent Pupillary Defect (RAPD). It is named after the Scottish ophthalmologist, Robert Marcus Gunn, who first described the condition in 1902.
Definition
The Marcus Gunn phenomenon is a condition characterized by a relative afferent pupillary defect, where the affected eye appears to dilate when exposed to direct light. This is due to an abnormal response of the pupil to light, caused by damage to the optic nerve or severe retinal disease.
Symptoms
The primary symptom of the Marcus Gunn phenomenon is an abnormal pupil reflex, where the affected eye dilates rather than constricts in response to light. This can be observed during a swinging flashlight test, a common diagnostic tool used by ophthalmologists.
Causes
The Marcus Gunn phenomenon is typically caused by damage to the optic nerve or severe retinal disease. It can also be associated with other conditions such as glaucoma, optic neuritis, and retinal detachment.
Treatment
Treatment for the Marcus Gunn phenomenon primarily involves addressing the underlying cause. This may involve treatment for the associated conditions such as glaucoma, optic neuritis, or retinal detachment.
See Also
External links
- Medical encyclopedia article on Marcus Gunn phenomenon
- Wikipedia's article - Marcus Gunn phenomenon
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