So this about Genshin Impact, is there any knowledge or reasonable theories about the condition Kaeya’s eye under his eye patch and how he got his eye in such a condition? Or is a magic eye…? Maybe it is pastey like Paimon said? xD
There are theories floating around, but nothing is concrete yet.
This answer contains spoilers for the Archon Questline in the game, as well as Kaeya’s and Albedo’s story quests, and other sources of lore like character stories and the manga. Take everything with a grain of salt, as I said before: Nothing is confirmed yet.
(Here, have this screenshot of the eyepatch squad I took to appease my sister.)
We know, canonically, that Kaeya is from Khaenri’ah – a country that none of the 7 Archons rule over. Some time about 500 years ago, there was a catastrophic even or series of events that cursed the country. (Khaenri’ah) It’s also known that Albedo, who is now the Alchemist of the Knights of Favonius, practices an ancient branch of alchemy that caused the disaster.
One theory is that all Khaenri’ah-born people have some sort of curse placed upon them, and Kaeya’s affects his eye somehow. (A side note – Albedo’s curse mark might be the gold four-pointed star on his neck, which is seen in other significant people and places, like Paimon’s hairclip, primogems, and the very beginning cutscent with the Unknown God.)
Dainself, the narrator of the youtube videos on Mihoyo’s official channel (Genshin Impact), is also canonically from Khaenri’ah and has an eyepatch as well, although his doesn’t cover his eye which kinda merits the question, “Is it an eyepatch if it doesn’t hide the eye?”
All jokes aside, we really don’t know. Khaenri’ah will eventually be released as a region in Teyvat, near the end of the storyline, according to this video:
I expect a ton of lore will be revealed in due time, especially since the Abyss Order and the Traveller’s twin are involved with the whole Khaenri’ah and Celestia thing, and we eventually will find out what’s going on. But for now, we can only speculate.
There’s another theory that hilichurls are corrupted Khaenri’ahns and we’ve been comitting murder this whole time, but I think that if realtively physically intact humans can survive in Khaenri’ah and have the resources to sneak into Mondstadt, they should be more or less fine in their homeland. Hopefully.
And, of course, you might just choose to believe that Kaeya wears his eyepatch in memory of his grandfather, the pirate, and that there’s absolutely nothing sinister or suspicious about his eyepatch whatsoever. Certianly nothing about Kaenri- Khanri- Khanraey. . . Ahem, the place where he hails from.