What is eversed Argyll Robertson Pupil?
The pupil reacts to light but not to accommodation reflex. This rare phenomenon may be seen in post-encephalitic parkinsonism. Describe the pathway of Light Reflex : Light falls on retina – optic nerve – optic chiasma – optic tract – superior collicut at midbrain – 2 nd order of neurone starts from here and goes to the Edinger – Westphal (E.W) nucleus bilaterally – preganglionic fibers go to the ciliary ganglion through the oculomotor nerve and its branch to the inferior oblique muscle – post ganglionic fibres from ciliary ganglion supply the sphincter pupillae an dciliaris muscle through short ciliary nerve. Describe the pathyway of Accommodation Reflex : Light falls on retina – optic nerve – optic chiasma – optic tract – lateral geniculate body – optic radiation – occipital cortex – frontal eyelid area or area 8 through superior longitudinal association tract – from here fibres descend to the oculomotor nuclei at midbrain as follows 1) Nucleus for medial rectus – medial convergence o
