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The change in the shape of the lens is controlled by the ciliary muscles inside the eye.Changes in contraction of the ciliary muscles alter the focal distance of the eye, causing nearer or future images to come into focus on the retina; this process is known as accommodation.The oculomotor neurons functions to send its axons in the oculomotor nerve, to control the medial rectus, and converge the two eyes.
Information from the light on each retina is taken to the occipital lobe via the optic nerve and optic radiation (after a synapse in the lateral geniculate body of the posterior thalamus), where it is interpreted as vision.
When moving focus from a distant to a near object, the eyes converge.
The ciliary muscle constricts making the lens thicker, shortening its focal length.
This limb includes Edinger-Westphal nucleus and the oculomotor neurons.
The main function of the Edinger-Westphal nucleus is to send axons in the oculomotor nerve to control the ciliary ganglion which in turn, sends its axons in the short ciliary nerve to control the iris and the ciliary muscle of the eye.