Fifty-one Japanese professional surfers were examined in order to analyze surfer's ear. Forty-one cases (80%), 71 ears, were diagnosed as surfer's ear. In 19 cases (37%), 30 ears, the external auditory canals had stenosed by more than 50%. In general, surfer's ear begins to appear after 5 years and is further aggravated by continued surfing. The age at which surfing is taken up has no influence on the appearance of surfer's ear. Surfers who surf on northern (colder) coasts have severer surfer's ear than those who frequent the southern (warmer) coasts.

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Almost all of the conventional clinical reports on the eye-tracking test are made on the horizontal component of the smooth pursuit function of oculomotor system; few are made on the vertical component. One reason is that during the conventional vertical eye-tracking test the artifacts caused by movement of the upper eyelids often make it difficult to analyze the data. To overcome this problem the authors have developed a method to record simultaneously the horizontal and vertical components of eye movement in the eye-tracking test, and moreover, to reduce artifacts as much as possible. Our method, the circular eye-tracking test, is performed by means of an apparatus that provides a visual stimulus drawing a circle clockwise, at a rate of 120°/sec, with a radius of 25.5 cm, and viewed at a distance of 70 cm.

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We examined fifty-one Japanese professional surfers in order to analyze 'surfer's ear'. Forty -one cases (80%) , seventy-one ears, were diagnosed as 'sufer's ear'. In ninteen cases (37%), thirty ears, the external auditory canals have stenosed by more than fifty percent. In general 'sufer's ear' begins to appear after five-year experience of surfin and agravates.The age when they began to practice surfin has no influence on the appearence of 'surfer's ear'. From the view point of their practicing places, the surfers from northern areas have severer 'surfer's ear' than those from southern areas.