Little House on the Prairie

Season 4, Episode 21

Episode Title: I'll Be Waving As You Drive Away (1)

Air Date: 1978-03-06

Overview:

Mary falls in love with Seth. When Mary's eyesight starts to get worse, Charles takes her to a specialist. He is devastated when the specialist tells him that Mary will lose her sight. Charles is unable to tell Mary for a while that she is going blind. When Mary does go blind, the whole family suffers.