You will need OptiFine HD U G5 or a newer release to properly process the advanced shaders.
This is common with GFME. Go to shader options → Water → Disable “Refraction” OR set “Water Transparency” to 0.85. File name- SEUS-PTGI-GFME-Shaders-All-Versions.zip
The base mod is the industry standard for ray tracing in Java Edition Minecraft. Unlike other shaders that fake lighting, SEUS attempts to simulate actual light bounces using path tracing. You will need OptiFine HD U G5 or
: Resolves issues with "ghosting" effects, lighting glitches in newer Minecraft versions, and adds support for the Distant Horizons mod Expanded Light Sources The base mod is the industry standard for
effects via software, meaning it does not require a dedicated NVIDIA RTX graphics card to function. Key features of the GFME edition include: Sonic Ether Per-Pixel Path Tracing
Support developers when possible. If you enjoy the shader, consider subscribing to Sonic Ether for a month to get the official, most stable version.