Moving Eyes, Nystagmus, Causes, Types of Nystagmus

Moving Eyes, Nystagmus, Causes, Types  of Nystagmus


Nystagmus


nystagmus, causes,types of nystagmus Nystagmus is a rhythmic oscillation of the eyes (moving eyes). It is a sign of disease of either the ocular or the vestibular system and its connections. Nystagmus impair the visual ability of an individual.

There are ocular causes of Nystagmus (defect in eye, eye muscles), Central Causes of Nystagmus (nystagmus secondary to central vertigo, central vertigo results from damage to vestibular nucleus of brain stem. which has connections to visual nucleus so any lesion of vestibular nucleus may affect the visual nuclei) Peripheral causes of nystagmus ( Peripheral causes include diseases of ear, the vestibular apparatus of ear, inner ear infections, damage to semicircular canals etc).

Types of Nystagmus


There are two types of nystagmus:

Jerk Nystagmus


It is the usual nystagmus of neurological disease and has two components, fast and slow.
Horizontal or rotatory nystagmus
Horizontal or rotatory nystagmus may be due to peripheral lesion (in middle ear) or central lesion (in 8th nerve, brainstem cerebellum and their connections).

Vertical nystagmus


Vertical Nystagmus is only caused by central lesion ( ie, by lesion inside brain )

Pendular Nystagmus


Pendular nystagmus means to and fro movements, which are similar in amplitude and velocity.
It occurs in ocular diseases in which there is long - standing severe visual impairment.