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Cycloplegia is paralysis of the ciliary muscle of the eye, resulting in a loss of accommodation. Cycloplegia with accompanying mydriasis (loss of adaptation) can be induced pharmacologically by muscarinic antagonists.Cycloplegia caused by Cyclopentolate 1% instilled into both eyes.
The eye's ciliary muscle contracts, causing the eye's natural lens to thicken or change shape, which allows us to see objects up close. Presbyopia develops as we age, when our lens becomes less flexible and resists changing shape. With presbyopia, up-close focusing becomes more difficult.
The ciliary muscle /ˈsɪli.ɛəri/ is a ring of smooth muscle in the eye's middle layer (vascular layer) that controls accommodation for viewing objects at varying distances and regulates the flow of aqueous humour into Schlemm's canal. It changes the shape of the lens within the eye, not the size of the pupil which is carried out by the sphincter pupillae muscle and dilator pupillae.