![]() When light is flashed into the affected eye: Pupil dilates in that eye because of nerve fibre damage.Take a torch and flash it into normal eye and observe: Pupil constricts in both eyes.optic disc, optic nerve just before optic chiasma) disorders like optic neuritis (M/C), AION, optic nerve glioma Normal pupil does not constrict because solution is very diluteĪlso Read : NEET PG 2023: High-Yield Topics for Ophthalmology Marcus Gunn Pupil (RAPD).0.125% pilocarpine solution used, put in both eyes.Confirmed by pilocarpine challenge test.Ciliary body fibers goes into aberrant mode & goes to pupil which is why it constricts so strongly to near objects but no reaction to light) No reaction to light & Accommodation reflex positive (aberrant regeneration: fibers innervating ciliary body i.e., III nerve fibers and parasympathetic fibers also innervate pupil, but the fibers innervating ciliary body is 30% than the pupil therefore after damage, there is regeneration in ciliary body.Vermiform movement of iris (sluggish moment).Unopposed sympathetic dilation of pupil occurs.Parasympathetic constrictor fibres of pupil to damage, so no constriction.Virus attacks ciliary ganglion, CN III is present in ciliary ganglion which gets affected causing.A/k/a Prostitute’s pupil (because it accommodates but no reaction).Light reaction - negative accommodation reflex - positive.Does not constrict to light but to near vision (because lesion is in dorsal midbrain damaging the light fibers but accommodation center is spared).Seen in neurosyphilis, tertiary syphilis.Read this blog and get a quick overview of this important Ophthalmology topic. Knowledge of abnormal pupillary responses is crucial for medical professionals appearing for NEET PG as it forms an important part of the ophthalmology section in the exam. Abnormal pupillary responses can provide valuable diagnostic information in various medical conditions, including neuro-ophthalmic disorders, systemic diseases and drug effects.
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