Two additional scenarios for see-saw nystagmus: achiasma and hemichiasma.
The discovery of canine achiasma and hemichiasma has been followed by the identification of human achiasma (four individuals, to date). See-saw nystagmus was present in all cases of achiasma (canine and human) and in one of two cases of canine hemichiasma studied. Human infants with see-saw nystagmus should be imaged for possible structural abnormalities of the optic chiasm.
Dell'Osso
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LF
Ocular Motor Neurophysiology Laboratory, Veterans Affairs Medical Center, Cleveland, OH 44106, USA.
Daroff
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RB
D000818:Animals; D004285:Dogs; D005124:Eye Abnormalities / Q000150:complications*; D006801:Humans; D009759:Nystagmus, Pathologic / Q000209:etiology*; D009897:Optic Chiasm / Q000002:abnormalities*; D014786:Vision Disorders / Q000209:etiology