Definition
Accommodation is the adjustment of the eye for seeing objects at various distances accomplished by the ciliary muscle, which controls the lens of the eye and allows it to flatten or thicken, bringing images of objects into focus on the retina as needed. The circular ciliary muscle fibers affect the zonular fibers of the crystalline lens during accommodation. When the ciliary muscle contracts, this releases tension on the lens caused by the zonules and causes the lens to become more spherical, adapting to shorter near range of focus. Accommodative spasm can result in ciliary muscle contraction and can be worsened by fatigue and strain.
Etiology
Functional accommodative disorders may be caused by trauma, eye-strain, or be nonorganic. Rarely true accommodative spasm can be organic.
Clinical Presentation
Functional accommodative disorders are characterized by intermittent...
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Further Reading
Walsh FB et al (2008) Walsh and Hoyt’s clinical neuro-ophthalmology: the essentials. Wolters Kluwer Health/Lippincott Williams & Wilkins, Philadelphia
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Choudhury, E., Almarzouqi, S.J., Morgan, M.L., Lee, A.G. (2018). Accommodation, Functional (Nonorganic/Nonphysiologic) Disorders of. In: Schmidt-Erfurth, U., Kohnen, T. (eds) Encyclopedia of Ophthalmology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-69000-9_1143
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DOI: https://doi.org/10.1007/978-3-540-69000-9_1143
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