Simplify the following text for a Grade 6 native English-speaking person.
Original: Because of Dalton 's work , the condition was often called daltonism , although this term is now used for a type of color blindness called deuteranopia .
Simplified: Because of this , the condition is sometimes called daltonism . As of 2009 , the word daltonism is used for only one type of color blindness called red\/green color blindness .