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Ophthalmology

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Refraction and Optics

Question
5 out of 41
 

No involved in pupillary light reflex: (AIIMS Nov 2013)



A Edinger-Westphal nucleus

B Optic nerve

C Lateral geniculate body

D Pretectal nucleus

Ans. C Lateral geniculate body

1. Shining light in one eye will result in constriction of both pupils equal; the constriction of the ipsilateral pupil is called the direct refer, and the constriction of the contralateral pupil, the consensual or indirect refer.

2. The afferent limb of the reflex is through the optic Qnerve,

3. Fibers pass through the chiasma, and exit the optic thract just befor the LGB center : Pretectalnuckeus in midbrain internuncial neurons from PTN to both sides of edingerwestphal nucleus

4. The efferent limb of the pupillary light reflex begins in the Edinger-Westphal nucleus.

5. They synapse in the ciliary ganglia at the back of the orbit and travel via short ciliary nerves to the iris sphincters.

6. Lesions in the efferent pathway cause anisocoria (the pupil on the affected side is larger than the normal pupil).

Refraction and Optics Flashcard List

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