CW Eye – Procedural Eye Material for Blender – Christoph Werner – Official Website
Human, creature and zombie 25-eyeball set - BlenderNation
Procedural organic, branching meshwork - Support / Materials and Textures - Blender Artists Community | Materials and textures, Artist community, Organic
Realistic Eyes in Blender + Free Project - 3DArt
ArtStation - 16 Colors of Realistic Eye (free demo) | Game Assets