The intrinsic eye muscles are innervated by the autonomic systems and include the iris sphincter and the ciliary muscle (innervated by the parasympathetic component of cranial nerve III), and the radial pupillodilator muscles (innervated by the ascending cervical sympathetic system with its long course from spinal segments T1 through T3).The muscles of the eye are designed to stabilize and move the eyes.There was evidence of pseudophakic accommodation up to 12 months postoperatively for AIOLs (mostly 1CU): subjective accommodation [95% confidence interval (CI), 0.36–0.98], objective optic shift (95% CI, 0.12–0.76).
The oculomotor nerve has the additional function of control of the pupil and therefore this will be discussed here as well.
Oculomotor function can be divided into two categories: (1) extraocular muscle function and (2) intrinsic ocular muscles (controlling the lens and pupil).
The extraocular muscles include: the medial, inferior, and superior recti, the inferior oblique, and levator palpebrae muscles, all innervated by the oculomotor nerve (III); the superior oblique muscle, innervated by the trochlear nerve (IV); and the lateral rectus muscle, innervated by the abducens nerve (VI).
Even a slight deterioration of any of your senses can be scary.
Not only can it interfere with your safety and your ability to understand your surroundings, but also it can have a huge impact on your overall comfort and independence.