Cycloplegia is the paralysis of the ciliary muscle, resulting in a loss of accommodation. The ciliary muscle has muscarinic (parasympathetic) innervation and controls the shape of the lens. Grays FIG. 872- The choroid and iris. ... Light from a single point of a distant object and light from a single point of a near object being brought to a focus by changing the curvature of the lens. ...

Cycloplegic drugs, including atropine, cyclopentolate, succinylcholine, homatropine, scopolamine and tropicamide, are indicated for use in cycloplegic refractions and the treatment of uveitis. Other cycloplegic drugs include Neostigmine, Phentolamine and Pilocarpine. Atropine is a tropane alkaloid extracted from the deadly nightshade (Atropa belladonna) and other plants of the family Solanaceae. ... Cyclopentolate is a mydriatic and cycloplegic agent. ... Suxamethonium chloride (also known as succinylcholine, or scoline) is a white crystalline substance, it is odourless and highly soluble in water. ... Homatropine (Equipin®, Isopto Homatropine®) is an anticholinergic medication that inhibits muscarinic acetylcholine receptors and thus the parasympathetic nervous system. ... Scopolamine, also known as hyoscine, is a tropane alkaloid drug obtained from plants of the family Solanaceae (nightshades), such as henbane or jimson weed (Datura species). ... Tropicamide (troe-PIK-a-mide) is an acetylcholine receptor blocker. ... The straw seems to be broken, due to refraction of light as it emerges into the air. ... Uveitis specifically refers to inflammation of the middle layer of the eye, termed the uvea but in common usage may refer to any inflammatory process involving the interior of the eye. ... Neostigmine is a parasympathomimetic, specifically, a reversible cholinesterase inhibitor. ... Phentolamine is a competitive nonselective alpha adrenergic receptor antagonist. ... Pilocarpine is a muscarinic alkaloid obtained from the leaves of tropical American shrubs from the genus Pilocarpus. ...

Unlike mydriatics, which also dilate the pupil, cycloplegic drugs inhibit focusing. Categories: Medicine stubs | Sign (medicine) ...

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