It’s important that you really understand what this S5 filter is before using it. Basically, according to a report cited by Mirror, the S5 filter is a built-in filter built into TikTok that can add a bluish color to your videos. Also, as we all know, this effect does not alter your eye color. The trend of using S5 filters started when I discovered the TikTok username Maliabroo, that the filter can change the color of your eyes when using the camera flash. However, flash can damage eyes, so it is best to use a filter without the flash.