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Mary Ingalls blindness: Study reveals Little House on the Prairie ...

Study reveals the REAL reason sister Mary Ingalls from beloved 'Little House on the Prairie' series went blind as a teenager - and it WASN'T scarlet fever

Mary on the TV show - I thought she was her most beautiful in this episode, when she & Pa went to this party only to find her prospective fiance being unfaithful.

Mary on the TV show - I thought she was her most beautiful in this episode, when she & Pa went to this party only to find her prospective fiance being unfaithful.

Melissa Sue Anderson

"Little House on the Prairie": Where are they now?

Melissa Sue Anderson played Mary Ingalls on the TV series "Little House on the Prairie."

Melissa Sue Anderson played Mary Ingalls on the TV series "Little House on the Prairie."

Melissa Sue Anderson aka Mary on Little House on the Prairie......my first childhood crush!!! LOL!

Melissa Sue Anderson aka Mary on Little House on the Prairie......my first childhood crush!!! LOL!

Melissa Sue Anderson caused 'The Brady Bunch's' Bobby to see fireworks after a brief kiss and at the age of 11. Anderson joined Melissa Gilbert on screen in 'Little House on the Prairie,' which earned her an Emmy nod in 1978. Following 'Little House,' Anderson worked as an associate producer on one of Michael Landon's last TV projects. Reportedly as mild mannered as her character, she romanced both Lorenzo Lamas and Frank Sinatra Jr. (he was more than twice her age) in her prime. She is now…

Melissa Sue Anderson as Mary Ingalls - Photos - 'Little House on the Prairie': Where Are They Now?

Melissa Sue Anderson caused 'The Brady Bunch's' Bobby to see fireworks after a brief kiss and at the age of 11. Anderson joined Melissa Gilbert on screen in 'Little House on the Prairie,' which earned her an Emmy nod in 1978. Following 'Little House,' Anderson worked as an associate producer on one of Michael Landon's last TV projects. Reportedly as mild mannered as her character, she romanced both Lorenzo Lamas and Frank Sinatra Jr. (he was more than twice her age) in her prime. She is now…

A Melissa Sue Anderson Fan Page website dedicated to Melissa Sue Anderson, the actress who played Mary Ingalls

A Melissa Sue Anderson Fan Page website dedicated to Melissa Sue Anderson, the actress who played Mary Ingalls