Detailed Instructions: Generate a correct and concise answer for the question based on the words in the context.
Problem:Context : Francois Huber was only fifteen years old when he began to suffer from a disease which gradually resulted in total blindness; but, with the aid of his wife, Marie Aimee Lullin, and of his servant, Francois Burnens, he was able to carry out investigations that laid the foundations of a scientific knowledge of the life history of the honey bee.
Question : What was Francois Huber's medical condition near the end of his life?
Solution:
blindness