Asked by: Rafa Euro
asked in category: General Last Updated: 26th March, 2020

What causes Marcus Gunn pupil?

Cause. The most common cause of Marcus Gunn pupil is a lesion of the optic nerve (between the retina and the optic chiasm) due to glaucoma, or severe retinal disease, or due to multiple sclerosis. It is named after Scottish ophthalmologist Robert Marcus Gunn.

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Also to know is, what causes Marcus Gunn?

The exact cause of Marcus Gunn phenomenon is not known. For reasons that are unclear, there is a bad connection between the nerves that stimulate, and the muscles that move, the eyelids and the jaw. Some clinical researchers believe that about half of the cases of Marcus Gunn phenomenon are genetically determined.

Similarly, what does it mean if your pupils are sluggish? Reaction to light When light is shone into the eye the pupil should contract immediately. This response is called the consensual light reflex. A sluggish pupil may be difficult to distinguish from a fixed pupil and may be an early focal sign of an expanding intracranial lesion and increased intracranial pressure.

Similarly, you may ask, what causes an afferent pupillary defect?

Causes of RAPDs Common causes of unilateral optic nerve disorders that can be associated with a RAPD include ischaemic optic neuropathy, optic neuritis, optic nerve compression (orbital tumours or dysthyroid eye disease), trauma, and asymmetric glaucoma.

What is reverse Rapd?

Detection of an RAPD requires two eyes but only one functioning pupil; if the second pupil is unable to constrict, such as due to a third nerve palsy, a “reverse RAPD” test can be performed using the swinging flashlight test. A transient RAPD can occur secondary to local anesthesia.

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