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KMID : 0390219910020010051
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Journal of Clinical Otolaryngology, Head and Neck Surgery
1991 Volume.2 No. 1 p.51 ~ p.57
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Visuaul suppression test in normal subjects
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Abstract
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It was well known that nystagmus from vestibular origin is easily suppressed by fixing the eye to one point and is termed as visual suppression. In examination of -provoked nystagmus, for example rotatory or caloric test, to avoid this visual suppression, we can use Frenzel´s glasses, prism or can examine the patient in dark field.
But recently, many researchers have found that the degree of visual suppression during the caloric test is good parameter for differentiating between peripheral and central lesion.
Authors has investigated the degree of visual suppression in 30 normal subjects(male 18, female 12) while caloric test as guideline in determining between peripheral and central lesions.
To obtain the degree of visual suppression( % ), authors has adopted the same method which was proposed by Takemori and Cohen in 1974.
The results obtained were as follows.
1. There were no differences between either sex statistically.
2. In visual suppression during cold irrigation (30°C), left VS- I was 65.76±10.30%, left VS-II was 51.35±9.69%, left VS-III was 58.56±9.42% and right VS- I , VS- H , VS-III were 66. 36±12.11%, 52.10±10.83%, 59.18±10.52% respectively.
3. In visual suppression during hot irrigation (441c), left VS- I was 66.53±10.07%, VS-II was 52.90± 8.82%, VS-III was 59.71± 8.7% and right VS- I , VS- II, VS-III were 66.50± 7.59%, 51.44± 10.90%, 58.97± 8.55% respectively.
4. There were no differences in respect to age.
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KEYWORD
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