Lack of ability to distinguish colors is called?

• A. Photophobia
• B. Presbyopia
• C. Monochromatism (Color Blindness)
• D. Esotropia

Answer: (C)

Color vision deficiency is when someone has trouble telling colors apart. The lack of ability to distinguish colors is called color blindness. Monochromatism is a specific form of color blindness where color perception is severely reduced or absent, often resulting in grayscale vision due to issues with the cone cells in the retina that normally detect color (red, green, and blue). In other words, color discrimination is greatly impaired because the eye’s color-detecting cells don’t function typically. This is different from photophobia (sensitivity to light), presbyopia (age-related near-vision trouble), or esotropia (eye turning inward).