05:56 PM EDT 08/24/2014
Originally posted 02/05/2013 09:45AM
Think you know everything about Laura Ingalls Wilder's Little House on the Prairie series?
Readers of the beloved series will remember how Wilder's older sister Mary went blind as a result of scarlet fever. But a new study published in Pediatrics, the Official Journal of the American Academy of Pediatrics, has revealed the cause of Mary's blindness was likely meningoencephalitis – a disease similar to meningitis.
Top 10 News Categories
The most buzzed about stars this minute!
Treat Yourself! 4 Preview Issues
More On PEOPLE.com
Got a News Tip?
Send it to our People.com editors!