2b. PLR And Its Lesions Flashcards
(14 cards)
What is the afferent and efferent limb of the pupillary light reflex?
Afferent: Optic nerve (CN II); Efferent: Oculomotor nerve (CN III).
What is the clinical significance of the Marcus Gunn pupil?
It indicates an afferent pupillary defect, commonly seen in optic neuritis.
Which lesion causes a dilated pupil that reacts to accommodation but not to light?
Argyll Robertson pupil (seen in neurosyphilis).
What is the hallmark of Horner syndrome?
Miosis, ptosis, and anhidrosis on the affected side.
Which test is used to diagnose Horner syndrome pharmacologically?
Cocaine and apraclonidine tests.
What causes a relative afferent pupillary defect without vision loss?
Optic nerve damage that’s partial or early (e.g., optic neuritis).
What is Adie’s pupil?
A tonic, dilated pupil with slow reaction to light and accommodation.
What are the characteristics of a midbrain (tectal) pupil?
Large, poorly reactive pupils due to dorsal midbrain syndrome.
What pharmacologic agent differentiates Adie’s pupil?
Dilute pilocarpine (0.125%) causes constriction.
What is the swinging flashlight test used for?
To detect a relative afferent pupillary defect.
The afferent limb of the pupillary light reflex is the ________ nerve, and the efferent limb is ________ nerve.
Optic , oculomotor
A positive swinging flashlight test indicates a ____________ .
relative afferent pupillary defect (RAPD)
Argyll Robertson pupil reacts to _______ reflex but not to ______ reflex.
accommodation , light
In ________ syndrome, the classic triad includes miosis, ptosis, and anhidrosis.
Horner
