A person with this form of color deficiency can see only shades of gray and truly no color what so ever.The person has cones but the cones are nonfunctional.

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Quizplus · Accepted Answer

Rod monochromacy is a rare form of color blindness where a person has no functioning cones and can only see shades of gray, similar to how things look in very low light conditions. It is also known as achromatopsia. Akinetopsia is the inability to perceive motion, deuteranopia is a type of red-green color blindness where the person has no functioning green-sensitive cones, and tritanopia is a type of color blindness where the person has no functioning blue-sensitive cones.

A Person with This Form of Color Deficiency Can See