Get the version corresponding to Minecraft 1.18 from the OptiFine website and install it.
Requires OptiFine HD U H4 or newer for Minecraft 1.18.1. SONIC ETHER’S SHADERS 1.18 - SEUS
A reinvention of the legacy SEUS versions designed to provide high-quality visuals using traditional rendering methods, resulting in better performance than the PTGI version. Version 1.18 Enhancements (PTGI HRR 3) Get the version corresponding to Minecraft 1
Optimized "HRR" (High Resolution Rendering) technology to reduce blurring during quick movement and improved stability. Technical Requirements SONIC ETHER’S SHADERS 1.18 - SEUS
