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The peristriate area 19 interprets accommodation, and sends signals via the Edinger-Westphal nucleus and the 3rd cranial nerve to the ciliary muscle, the medial rectus muscle and (via parasympathetic fibres) the sphincter pupillae muscle.During the accommodation reflex, the pupil constricts to increase the depth of focus of the eye by blocking the light scattered by the periphery of the cornea.The refractive power mainly resides in the cornea, but the overall refractive power is achieved by the actual lens changing its shape.In order to fixate on a near object, the ciliary muscle contracts around the lens to decrease its size.
Read on to learn more about what accommodations are and how they can help your child.
Convergence is the ability of the eye to simultaneously demonstrate inward movement of both eyes toward each other.
This is helpful in effort to make focus on near objects clearer.
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.
When moving focus from a distant to a near object, the eyes converge.