作者：谁敢动我的牙
使用理由
想必大家都知道，蔡司是一个全球领先的光学于光电行业科技集团，蔡司视力保健事业部是全球领先的镜片和眼科仪器制造商之一。我在他家的网站上发现一个实用的小软件，今天给大家分享一下，估计很多人都不太了解。
这就是蔡司的在线视力筛选检查
通过这个项目，我们可以简单并且快速的检测自己的眼睛。当这个检测结束后，会给出我们一个是否需要在进步一详细检测的小建议。
外观展示
整个筛选检查项目包含：
视敏度检查是一个非常重要的检测项目，我们正常常规检查都是看“E”字表，主要是通过识别缺口的朝向来判断视力。然后我们通常会被验光师进行一个被称为主觉验光的程序，将不同的度数镜片，插入试镜架然后再我们沟通感觉戴上那个镜片的视线效果更好。
在我们个人的电脑上就可以做一个简单的测试，测试之前需要把显示器的亮度提高到最大，这样避免亮度不足造成的测试结果误差。
找个银行卡来做一个对比参考，把测试页面的这张图上的卡片，调整到和实际卡片大小相等的尺寸。
不同于我们平时在眼镜店的测视力，蔡司在线版的测试是要求测试者如果有眼镜就戴好。
和我们传统的“E”字表不一样，在线测试使用的是我们俗称的“C”字表，它一共有八个缺口方向指向，对视力的要求更高，我第一次了解这个东西，还是传说飞行员在检测视力的时候都看这种表。
为了避免误差，整个检查的过程中，我们要距离显示器在一臂远的距离。
检测开始之前，自己找一个东西遮挡住左眼，然后测试中途再轮换到遮挡右眼，分别测两只眼的视力情况。
测试过程比较简单根据上面的“C”字为基准，对应的点下面的缺口，系统会自动的根据你测试结果，调整下一张图的大小，这个感觉就和在店里验光是一样的，就是这个“C”字看起来，要比“E”字更有难度。
对比度视力（发现不同灰度的能力）的重要性很多，其中就包括良好的夜视。这项参数也是逐渐改变，这就意味着我们一般不会轻易注意到视觉上的微小变化，这也就是为什么要定期检查眼睛的重要性。
对比度视力检查，看的东西和视力检查是一样的，也是用这个“C”字表，在检测过程中，灰度会逐渐变的更亮，我们也是通过确定缺口的位置，来点击响应的反应环部位。
这部分就是我们俗称的“色盲”检测，这个就是我们发现不同颜色和色调的能力，这部分所谓的随着时间的推迟逐渐变化的可能性几乎没有，通常都是先天遗传的，但是它确实能影响到后期的许多方面，尤其是教育，考试，甚至是某些职业要求上。
散光是因为眼睛角膜或者晶状体弧度引起的一种缺陷，属于常见病，会导致视力模糊或者扭曲，并且可能随着年龄的增长发生变化。散光是可以通过合适的眼镜或者是隐形眼镜来矫正的。
散光的检测是通过半圆形的黑线进行散光检查，如果存在散光，这些黑线就会呈现出不同的灰度。
视野主要是指我们感知光线以及发现物体的空间范围，这种范围会因为某些眼部疾病或者是神经系统的原因尔缩小
这是以可靠的临床阿姆斯勒测试为基础，采用方格状结构进行视野检查。
最后会给出一个简单的评估测试结果，也会推荐你去有合作的门店进行进一步的专业检测。这是一个免费简单便捷的测试方式，电脑端和手机端都可以体验，整个流程大概在6分钟左右，最后还可以查找自己位置附近的蔡司光学合作门店。我感觉是一个挺实用的小程序。
总结
我在最后把PC端的蔡司在线视力检查链接放一下，有兴趣的朋友们可以上网自己先做一个初步的筛查。
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