Mary Ingalls was cramming for her teacher’s exam by the light of an oil lamp when the words on the page began to swim. In the two-part Little House on the Prairie episode “I’ll Be Waving as You Drive Away,” which NBC aired on March 6 and March 13, 1978, she knocks that lamp over and starts a fire, and a trip to the eye doctor brings the news every viewer dreaded. Mary is going blind, and the show traced it back to the scarlet fever she had suffe…
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