Why Sith Lords Have Yellow Eyes (But Dooku Doesn't)

TIL for a moment, Count Dooku's eyes appeared yellow (like many Sith) as he was training Savage Opress in the ways of the Force. : r/StarWars

Why Sith Lords Have Yellow Eyes (But Dooku Doesn't)

❔ [Lore: Sith] Why doesn't Dooku have Sith eyes and skin?

Why Sith Lords Have Yellow Eyes (But Dooku Doesn't)

In Star Wars, do people with yellow eyes get mistaken for Sith Lords even though they were just normal people like tax collectors? - Quora

Star Wars: The Yellow Eyes Of The Sith, Explained

Why Count Dooku Didnt Have Sith Eyes Star Wars Explained – Otosection

Why doesn't Dooku have yellow eyes in Star Wars? Because he's not a true Sith? - Quora

What causes Sith to have yellow eyes? Is it a physiological change caused by use of the dark side or is it due to emotions? I also noticed that they aren't always