What is the term for paralysis of the ciliary body?

The term for paralysis of the ciliary body is cycloplegia. This condition occurs when the ciliary muscles, which control the shape of the lens for focusing, are temporarily paralyzed, preventing them from accommodating or adjusting focus for near or distance vision. In clinical settings, cycloplegia is often induced during eye examinations to allow for an accurate assessment of refractive error, as it disables the eye's ability to change focus. This is particularly helpful when determining the true refractive state of the eye without the influence of accommodation.

Other terms in the question refer to different conditions: myosis is constriction of the pupil, astigmatism is a refractive error due to an irregularly shaped cornea, and presbyopia refers to age-related difficulty in focusing on close objects. These terms highlight different aspects of vision and ocular function that do not pertain to the paralysis of the ciliary body.