Nystagmus
Blockage Syndrome
The nystagmus blockage
syndrome (NBS) is a type of nystagmus that begins in early infancy
accompanied by esotropia. In these infants, as the
eye is
moving laterally towards the abduction, the nystagmus
appears. The name "nystagmus
blockage syndrome" reflects the assumption that patients block their nystagmus
by converging their eyes.
Esotropia associated with
manifest latent nystagmus (MLN), is usually mistaken
for NBS.
The differentiation between
MLN from NBS may be difficult because most
esotropic infants with
manifest congenital nystagmus show an
increase in the magnitude of the nystagmus with
abduction of the fixating eye, which is
characteristic of manifest-latent but not of
manifest congenital nystagmus .
Surgery
Of various surgical
approaches, a recession of both medial rectus
muscles, which may be combined with posterior fixation sutures,
is advocated .
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