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Thursday, February 17, 2011

SQUINT (STRABISMUS)

Squint occurs when the two eyes fail to move in a coordinated fashion. Diplopia results unless one has very poor vision or the defect has been of long-standing since childhood,
when information from one eye becomes suppressed at cortical level (amblyopic eye). Squint may be paralytic or non-paralytic (concomitant).

Paralytic squint: This is due to weakness of one or more of the external ocular muscles because of lesions of the III, IV or VI nerves or of muscles disease (e.g. myasthenia gravis).

Non-paralytic or concomitant squint: This usually has onset in childhood, and is due to failure of development of normal fixation reflexes. This commonly due to refractive error or some other ocular defect, and provision of appropriate correcting lenses may prevent the squint from becoming permanent.

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