A Blender node group that fakes caustics in the eyes, released as a CC0 Blend file.
How it works: A Light Path node adjusts the shadows, and a Layer Weight node recreates the look of eye caustics. OP says the goal is looks, not realism.
Bounces: It keeps only the 2nd bounce. That breaks caustics in reflections, so a menu toggle and bounce input bring them back.
Eevee: It works but is "a little bit handicapped." Shadows cap at 0 to 1, so the iris needs a second node group and an Iris material. OP only tested it lightly on a 10GB VRAM card.
Versus MNEE: OP says this avoids MNEE's slowdowns and gives more control, but suspects MNEE is more realistic.
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TL;DR of the post, generated automatically.
A Blender node group that fakes caustics in the eyes, released as a CC0 Blend file.
Ordered: Conan-worthy armor renders.