hypometria


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Related to hypometria: Dysdiadochokinesia, hypermetria

hypometria

 [hi″po-me´tre-ah]
ataxia in which movements fall short of the intended goal.

hy·po·met·ri·a

(hī'pō-mē'trē-ă),
Ataxia characterized by underreaching an object or goal; seen with cerebellar disease. Compare: hypermetria.
[hypo- + G. metron, measure]

hy·po·me·tri·a

(hī'pō-mē'trē-ă)
Ataxia characterized by underreaching an object or goal; seen with cerebellar disease.
Compare: hypermetria
[hypo- + G. metron, measure]

dysmetria, ocular

Abnormality of eye movements in which the eyes overshoot (hypermetria) or undershoot (hypometria) when attempting to fixate an object. It could be a sign of cerebellar disease, ocular motor nerve paresis, myasthenia gravis, internuclear ophthalmoplegia (overshoot of the eye contralateral to the lesion), etc. See flutter; opsoclonus.
References in periodicals archive ?
This may contribute to saccadic hypometria, as depicted in Figure 2, and slowed initiation of voluntary saccades [57] such as reduced number of rapid alternating self-paced saccades where subjects are asked to shift their gaze as fast and as accurately as possible between to stationary targets [45].
Saccadic hypometria in MSA can be observed, with mildly or moderately inaccurate saccade amplitudes.
Study of oculomotor dysfunctions both in PSP-RS and in PSP-P revealed a similar presentation comprising slowed vertical saccades, saccadic hypometria, prolonged latencies, and impaired pursuit eye movement [65].
In a recent study of oculomotor function in thirty patients with MSA, (8) excessive square-wave jerks were observed in 21 of the patients, a mild supranuclear gaze palsy in eight patients, a gaze-evoked nystagmus in 12 patients, a positioning down-beat nystagmus in 10 out of 25 patients, mild-moderate saccadic hypometria in 22 patients, impaired smooth pursuit movements in 28 patients, and reduced vestibulo-ocular reflex (VOR) suppression in 16 out of 24 patients.
(8) have recently published a list of 'red flag' criteria that are strongly suggestive of a diagnosis of MSA and include excessive square-wave jerks, mild to moderate hypometria of saccades, impaired VOR, and nystagmus.
Particularly useful in separating MSA from other Parkinsonian syndromes is the presence in the former of excessive square-wave jerks, mild to moderate hypometria of saccades, impaired VOR, and nystagmus.
In complex nonunion, intramedullary nailing is preferred in delayed consolidation and hypertrophic nonunion without angular defects or hypometria, while the Ilizarov method is more often indicated in atrophic nonunion and in hypertrophic nonunion with hypometria and angular defects [4].
The main abnormality consists of saccade hypometria, although all types (predictive, anticipatory, and memory-guided) of saccade generation may be involved [24].
Hence, particularly useful in separating MSA from other Parkinsonian syndromes is the presence in the former of excessive square-wave jerks, mild to moderate hypometria of saccades, impaired vestibule-ocular reflex (VOR), and nystagmus.