The relations between a decline of facial muscular strength by the softening of foods and a decline of vision

日本年轻人的视力在这40年或更长时间内呈下降趋势，视力均值的最大值现在是5~6岁。作者试图测量幼儿园儿童的视力和咬合力，并对他们的饮食生活进行问卷调查。用自动验光仪测量儿童的视力，用牙科预刮色法测量儿童的咬合力，并对咬合力、咬合面积、咬合压力和左右咬合平衡进行讨论。5~6岁的儿童大多有乳牙，但也有许多病例没有牙齿磨损。这意味着它们的食物生活是在软性食物上进行的，它们的隐蔽力分布在480N到6N之间，无论最大年龄相差两岁，视觉敏锐度和隐蔽力的分布都没有差异。在食品硬度的感官评价中，豆腐是典型的软食品。但是，一些孩子认为它是一种通常硬度很高的食物。这表明它们在断奶后的饮食生活中存在着许多问题。我们必须关注预防婴儿生活中视力下降和隐匿力下降的方法。

Visual acuity of young Japanese is decreasing for these 40 years or more, and the maximum of mean value of the vision is now 5 to 6 years of age. It has suggested that one of the cause of the decline is a decline of facial muscular strength, and the author tried to measured the vision and the occulusal force of kindergarden children, and also asked their food life by the questionnaire.The vision of the children were measured by the auto-refractometer and the occulusal force were mesured by the dental presucale method, and occulusal force, area of occulusion, occulusal pressure and the occulusal balance of right and left are discussed.The most of the children aged 5 to 6 years have milk teeth, but there were many cases who have no dental abrasion. It means that their food life is carried on the soft food, and their occulusal force have been distributed between 480N and 6N.Regardless of two years age difference at the maximum, there were no differences at the distributuion of the visuaal acuity and occulusal force. In the sensual evaluation of the hardness of the foods, TOFU was the typical soft food. But, some children evaluated it as a food with usual hardness. It suggest that there are many problems in their food life after the weaning. We have to concern the method of the prevention of a decline of vision and occulusal force in the infant life.