1. a person who has color blindness, especially red-green color blindness
Usage: named after John Dalton, the chemist who first described the condition; somewhat dated or technical; 'color-blind person' is more common in modern usage

1. relating to or affected by color blindness, especially red-green color blindness
Usage: technical or medical context; less common than 'color-blind' in modern English

Examples

• John Dalton was a daltonian who made important contributions to chemistry despite his color blindness.
• The test revealed that he was daltonian and unable to distinguish red from green.
• Many daltonians find it helpful to use specialized apps that assist with color identification.
• Daltonian vision affects approximately 8% of males and 0.5% of females.
• She discovered she was daltonian when she failed the color vision screening at her eye exam.