OptiForge

OptiForge is a mod that provides compatibility with OptiFine in a Forge modded environment for 1.13.2 versions of Minecraft and higher.

OptiForge is also the term that would be used to call OptiFine in a Forge environment in general, but this term applies more to versions before the OptiForge mod was created (1.12.2 and prior).

Installation:

 * 1) Setup a Forge modded environment (choose launcher to use, add Forge to it).
 * 2) Download OptiFine from it's official site.
 * 3) Download the OptiForge mod from Curseforge.
 * 4) When the environment is ready (whether a large modpack or a small test pack, either will work). Add OptiFine and OptiForge to the mods folder (extracting OptiFine isn't necessary).
 * 5) Launch the game with the Forge profile and the obvious signs of the Video Settings additions will make it clear that it was applies/installed correctly). The OptiForge mod will be visible in the Mod Options menu.



References:

 * OptiFine Official Website Downloads
 * OptiForge Curseforge Downloads