Why didn't Nagato die

[Fair Warning]

So the gift of sight is now classified as an eye tech

Wow you are dense.

Byakugan, drains chakra. Sharingan, drains chakra. Rinnegan, drains chakra.

The fact that you can't turn it off Is why it drains chakra. Read the Manga

 

[CloyEscapade]

Wow you are dense.

Byakugan, drains chakra. Sharingan, drains chakra. Rinnegan, drains chakra.

The fact that you can't turn it off Is why it drains chakra. Read the Manga

Data book says rinnegan doesn't affect chakra and sharingan is ok if senju dna is present... That's why Danzo could open so many eyes... Please show me where we are told rinnegan drains chakra. I'm open to it, I'm not dense I just want fact not your assumption

 

[Keezyyy]

Being an uzumaki he had a strong life force and a lot of chakara

 

[vasu 32]

The people of 4 descendant clans,hyuga,uzumaki,senju and uchiha can use eyes without any problem.