Depending on what you are looking for, here is the distinction between these two types of content:
: These appear as additional swatches in Create-a-Sim (CAS). They don't replace the original eyes, allowing you to have a massive variety of colors and styles from different creators simultaneously. Popular Sources for Eye CC
g., realistic "Alpha" vs. cartoonish "Maxis Match") for your game? Eye colors default replacement non-default at...
: Search under the "Makeup" or "Eye Color" categories.
: These swap out the standard EA (Electronic Arts) eye textures for every Sim in your game. You can only have one set of default replacements installed at a time. Depending on what you are looking for, here
: Known for "Eyes V2," offering a very realistic but "Maxis-Match" (style-consistent) look.
If you are looking for high-quality "good content" eyes, these creators are frequently cited for their default and non-default sets: cartoonish "Maxis Match") for your game
: A great visual board for finding "lookbooks" that link directly to the creators' Patreon pages.