In OBS, the steps of adjusting the filter according to the night vision effect are as follows:

1. Select the scene to edit in OBS, and then click the Filter button.

2. Click the+button to add a new filter and select the color correction filter.

3. In the color correction filter option, reduce the saturation to the minimum value, usually "-100".

4. In the color correction filter option, adjust the brightness to the desired night vision effect, usually between "-30" and "-50".

5. (Optional) You can add another Adjust Levels filter to adjust the color values of red, green and blue to get better output results.

Adding filters will have a certain impact on the image quality, so the filters and parameters should be adjusted according to the needs of different scenes. If you want to make a more realistic night vision effect, you need to spend more energy to adjust the filter parameters and use professional software and hardware for post-processing.