lenses

• Opacity of the lens is readily visible, especially in advanced cases .
  晶状体的混浊易于识别，特别是在晚期病例。
• Nearsighted eyes were equipped with thick lenses of great distance-power .
  一对近视眼戴着一副深度的、厚厚的眼镜。
• In camera, the lens must be focused on the object to be photographed .
  照相机内的镜头必须对准要拍照的物体调节焦距。
• Evidently, it would be desirable for the lens to form a magnified, erect image .
  显然，我们希望透镜成一个放大的正象。
• One highly successful approach utilizes a triplet aspheric lens array .
  一种很成功的方法是利用一个三合非球面透镜阵列。
• Probably because the cemented lenses are distorted by temperature variations .
  这大概是因为胶合透镜会因温度变化而变形。
• Near this village, the thickness of this lens reaches abut a hundred metres .
  在这个村庄附近，透镜体的厚度达100米左右。
• Then the scratches and spots on the field lens would be visible at the eye lens .
  此时场镜上的划痕和小点会在接目镜中看见。
• These lenses are therefore suitable when using the mercury green band .
  所以，当采用水银灯的绿色光带时，此种透镜是适用的。
• The focal length of the camera lens plays an important role in photo criteria .
  摄影机镜头的焦距在摄影规范中起着重要的作用。