Group of four is spiderman pointing I think

Connections Puzzle #810 🟦🟦🟦🟦 🟪🟪🟨🟪 🟪🟪🟪🟪 🟨🟨🟨🟨 🟩🟩🟩🟩

I thought I’d gotten an easy group:

Tap for spoiler

Rod, Cone, Iris, and Lens all being part of the eye

Are you ready for the salad theory?

It’s also available on steam if that simplifies things: …steampowered.com/…/projectM_Music_Visualizer/