The nerve supply to the eye consists of two sensory cranial nerves which carry visual impulses from the eye to the brain: 1) optic nerve (cranial nerve II
) and 2) ophthalmic (cranial nerve V).
(2) OAS can lead to dysfunction of the ophthalmic branch of the trigeminal nerve (cranial nerve V1), oculomotor nerve (cranial nerve III), trochlear nerve (cranial nerve IV), abducens nerve (cranial nerve VI), and optic nerve (cranial nerve II
(9) Cranial nerve II
is the afferent tract of secondary sensory pathways that contains photosensitive ganglion cells forming the retinohypothalamic tract that perceive incoming light.
His course was also complicated by the development of partial right cranial nerve II
and VII palsies.
Apart from cranial nerve I (loss of smell) and cranial nerve II
(decreased visual acuity), all other cranial nerves were functionally intact.
Pupil constriction to light involves cranial nerve II
, which senses light, and cranial nerve III, which stimulates the motor response to constriction of the diameter of the pupil.
Damage to cranial nerve II was assessed by visual acuity, color vision, pupil testing, and optic atrophy.
For simplicity and to reflect the difficulty in assessing specific cranial nerve injury in this population, we separated the data for cranial nerve II and aggregated the data for cranial nerves III, IV, and VI.