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Operation for squint after paralysis of the abducens.

Both are supplied by the abducens nerve, together with the rectus externus muscle.

The olfactory, optic, oculo-motor, pathetic, ophthalmic division of the trigeminal, and the abducens nerves are all liable to be implicated.

The defect of movement towards the side of the right abducens amounts to about 2 or 3 mm.

Crossed diplopia could be produced with a red glass, tenotomy of the left abducens sufficed to correct it.