A form of ataxia characterized by impaired ability to accurately control the amplitude, force and timing of voluntary movements, as a result of which a person overestimates or underestimates the desired trajectory (hypermetry or hypometry). Most often, it occurs when the cerebellum, which is responsible for coordinating movements, is affected. Dysmetria is often detected by finger-nose or heel-knee tests, when movements are inaccurate or uncoordinated. It can affect both fine and gross motor skills and occurs in conditions such as multiple sclerosis, stroke, or cerebellar degeneration.