Hashirama's cells or Zetsu substances don't give you eternal eyesight. Obito has it, but his MS doesn't go blind in him. Sasuke's goes blind and he had Zetsu on him.
Sasuke had Zetsu hiding within him, Obito's body was surgically fused with Hashirama's cells which is why he could use Mokuton and not go blind. Comparing the two is like assuming SA have Kurama's powers
Sasuke had Zetsu hiding within him, Obito's body was surgically fused with Hashirama's cells which is why he could use Mokuton and not go blind. Comparing the two is like assuming SA have Kurama's powers
There are multiple factors when comparing Obito and Sasuke bro.
Sasuke using Techniques like Susanoo , and using both of his eyes, and using them without any sort of rest and so on.. had much bigger impact on his eyes and eye sight. Compared to somebody like Obito, who only used Kamui.
And then of course being alive due to Hashirama's dna.