Rav Sheshet Sima himself

Rabbi Gershom writes that he blinded himself. Of course, this is the Rabbi's pikuach nefesh. There was no modern medicine. I speak according to Rabbi Gershom's explanation.

I didn't see it there. On the contrary, I saw in his words at the end of the tractate that Segi Nehorin was made.
But even without modern medicine I don't see why there is necessarily a pico”n here.

Here is the quote:
El Rav to Rav Shimi. Shimi you are. You are the one Shimi. Since he would not see him because of his faded house in many miles of piety that he would not raise his eyes from the ground and would look before him out of great humility, and this was one of his dimensions. And Rav Yosef and Rav Shesha, his six disciples, wanted to act in this dimension and became Segi Nahorin:

I understand. This is how Wikipedia gave the entry for Rabbi Gershom. Forgive me. Thank you Rabbi