User blog comment:Moogleknight24/Why are the Falmer blind?/@comment-68.227.12.98-20120528083116

I thought it was explained in game? The dwemer preactically made it an essential part of their diet, so even after their masters had perished they needed the mushrooms to actively live. They became dependant on it, either that or it was so heavily engrained into their system that when the female snow elves gave birth the condition was passed on to the offspring.