Ocular dippingについて

Two cases of ocular dipping

　両眼が正中位からゆっくり下転し，急速にもとに戻り，側方への動きも伴うことを特微とするocular dippingの2症例を報告した．発生機序として，上方注視障害と下方注視抑制の解除に，上位中枢からの抑制の解除が加わり生じたものと考えられた．責任病巣は間脳・中脳移行部が最も関係が深いと思われた．

Two cases of ocular dipping are reported. One case was a 7-year-old girl with severe hypoxia due to drowning and the other was a one-year-old female baby with Lennox syndrome. Both cases manifested characteristic downward eye movements consisting of slow downward and rapid upward movements. Horizontal eye movements were intact as different from ocular bobbing.

It appeared that the ocular dipping in these cases resulted from upward gaze palsy and impairment of the inhibitory fibers involved in downward gaze. Acute hypoxia also seemed to have played a crucial role in the genesis of ocular dipping.

The clinical features and particularly the associ-ation of Lennox syndrome indicated that the lesion responsible for the abnormal eye movemets was located in the thalamo-mesencephalic junction.