Eye deviation and compensatory ocular counterrolling after regional destruction of the sacculus by laser spot irradiation.

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Eye deviation and ocular counterrolling in guinea pigs after regional destruction of the sacculus by Laser spot irradiation was investigated qualitatively and quantitatively.1. Eye deviation in normal head position: guinea pigs with destruction of 1 /3 of the anterior portion of the sacculus, showed peculiar eye deviation even when the head position was normal; i.e. the eye on the side of destruction deviated downward and laterally, while the eye on the non-operated side deviated slightly laterally.2. Eye position and counterrolling when the head and body were tilted showed two different patterns depending on the direction of the tilt. When the tilt was down towards the damaged side, the eye position appeared "fixed" and counterrolling was scarcely observed. However, counterrolling occurred when the tilt was towards the intact side in an "almost normal manner" or "increased counterrolling".3. Follow-up observations for 3 weeks postoperatively showed that the abnormal eye deviation and ocular counterrolling subsided and gradually improved.These results indicate that regional destruction of the sacculus disturbs fixation of the eyes and ocular counterrolling of the eye on the same side and then causes deviation of the contralateral eye. These results and the facts reported by other investigators suggest that the sacculus on the lower side during head-body tilt acts as the primary and leading factor in vestibulo-ocular reflexes.
耳鼻咽喉科臨床学会の論文

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米田敬
山口大学医学部耳鼻咽喉科学教室

Eye deviation and compensatory ocular counterrolling after regional destruction of the sacculus by laser spot irradiation.

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