Yes, Adam did regain his sight. On episode 10 season 7 of little house. The episode was called, "To see the light".
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Considering when the sword was placed back in the stone, not only did the robot army return back to normal but also the two headed dragon, my guess would be that he did get his sight back even though the loss of his sight wasn't caused by magic. But it doesn't really appear that he did regain his sight. When you see Kayley running up to him once Ruber was defeated, you can see that Garrett seemed to be searching for her. And he still had his walking stick at when they were knighted.
Stop Her On Sight was sung by Edwin Starr
Sword of Omens, give me sight beyond sight!
Second Sight - Marc Johnson album - was created in 1987-03.
Line Of Sight