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Marcus Gunn phenomenon is an autosomal dominant condition with incomplete penetrance, in which nursing infants will have rhythmic upward jerking of their upper eyelid. This condition is characterized as a synkinesis : when two or more muscles that are independently innervated have either simultaneous or coordinated movements.
A relative afferent pupillary defect (RAPD), also known as a Marcus Gunn pupil (after Robert Marcus Gunn), is a medical sign observed during the swinging-flashlight test [1] whereupon the patient's pupils excessively dilate when a bright light is swung from the unaffected eye to the affected eye. The affected eye still senses the light and ...
Marcus Gunn pupil: Robert Marcus Gunn: ophthalmology, neurology: severe retinal disease, lesion of optic nerve anterior to chiasm: Gunn's pupillary phenomenon at Who Named It? Relative pupil dilatation when light swings to the affected side Markle's sign: George Bushar Markle IV: surgery: appendicitis (needed) RLQ pain on dropping from standing ...
Aponeurotic and congenital ptosis may require surgical correction if severe enough to interfere with the vision or if appearance is a concern. Treatment depends on the type of ptosis and is usually performed by an ophthalmic plastic surgeon or a reconstructive surgeon specializing in diseases and eyelid problems.
The two different types of near response are caused by different underlying disease processes. Adie's pupil is caused by damage to peripheral pathways to the pupil (parasympathetic neurons in the ciliary ganglion that cause pupillary constriction to bright light and with near vision).
However, papillitis may be unilateral, whereas papilledema is almost always bilateral. Papillitis can be differentiated from papilledema by an afferent pupillary defect (Marcus Gunn pupil), by its greater effect in decreasing visual acuity and color vision, and by the presence of a central scotoma. Papilledema that is not yet chronic will not ...
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