It’s on his page, go to notes

Its believed that his eyes glow as a vestigile reminant of his father's powers.

The notes contridict themselves that's why I ask

Thats because its never been fully clarified. It thought to be genetic though.

Scott and gabriel both have connection to their powers through their eyes. Ruby summers also does though shes not 616. Alex doesnt but his powers function somewhat differently.

Likely, nathan's eyes are a vestigile reminant of cyclop's genetics.