Protective countermeasures are under development, including lens shutters and filters that block certain laser frequencies.
防御性对策正在开发，包括透镜光闸及滤波器，能阻止某个频谱的激光。
There are two panels inside your camera that are like lightproof curtains on a window and block the light coming through the lens from hitting the sensor.
相机里面有两块隔板，他们就像防光的窗帘一样不让通过镜头的光线照射到传感器上。
The lens is the main factor causing papillary block.
晶体是引起瞳孔阻滞的主要因素。
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