Cathode Ray Tube Light Filter

A Cathode Ray Tube (CRT) light filter is a type of filter that is used to reduce the amount of blue light emitted by CRT monitors. CRT monitors are older types of computer monitors that use cathode ray tubes to display images. These monitors emit a significant amount of blue light, which can cause eye strain and fatigue, especially when used for long periods of time.

CRT light filters are typically made of a special material that helps to absorb or block the blue light emitted by the monitor. By reducing the amount of blue light, these filters can help to alleviate eye strain and make the viewing experience more comfortable.

It's worth noting that CRT monitors are not as commonly used today, as they have been largely replaced by LCD and LED monitors, which emit less blue light. However, if you still have a CRT monitor and find that you experience eye strain or discomfort while using it, a CRT light filter may be a helpful solution.