求翻译：在器件后置一光栏，人眼从后面通过光栏的小孔对外观察。小孔只容许透过部分散射光，对眼睛有较好保护作用。但是这种器件不容许入射光太强。是什么意思？

Set in the device after a light bar, external observation of the human eye from the rear light bar holes. The holes allow only through a part of the scattered light has a good protective effect on the eye. But this device does not allow the incident light is too strong.

After a built-in devices, eye-bar from the back through the small hole external observation. through small holes to allow scattered light, part of the eye is a good protection. However, this device does not allow the incident light is too strong.

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At the device rear light bar, the human eye by small light bar from the back holes of external observation. Small hole allowing through only part of the scattered light, better protective effect to your eyes. However, this device does not allow incoming light is too strong.

In component postpositioned light fence, human eye from behind transmitted light fence eyelet foreign observation.The eyelet only allowed the penetration partial diffused light, have the good protective function to the eye.But this kind of component did not allow the incident light too is strong.