Spasm of accommodation

An accommodation spasm is a condition in which the ciliary muscle of the eye remains in a constant state of contraction. Normally, this contraction bends the lens to allow the eye to "accommodate" for near-vision. However in a state of perpetual contraction, the ciliary muscle cannot relax when viewing distant objects. This causes vision to blur when attempting to view objects from a distance.

Although antimuscarinic drops can be applied topically to relax the muscle, excessive pupil dilation may occur as an unwanted side effect. The dilation may pose a problem since it could allow an increased amount of harmful ultraviolet light to enter and damage the eye.