protanopia
/ˌproʊtəˈnoʊpiə/
noun
- A type of color blindness where a person cannot see red light; red and green look similar.
- People with protanopia often confuse red and green traffic lights.
- Because of his protanopia, he could not tell the difference between ripe and unripe tomatoes.
- The eye doctor diagnosed him with protanopia after the color vision test.