Non-default(28 swatches)
These show up as extra color options in the eye pigment section.
Default Replacement(18 swatches)
These replace the base game EA colors. This is a great option if you want to replace the eyes of random townie sims or if you enjoy sticking to one type of eyes!
Facepaint(28 swatches)
These show up in the Makeup facepaint category in Create a sim. They can be worn on top of existing eyes just like a clothing item. If you want to use the Comet eyes on occult sims too, this is a great option!