Final answer:
The defect of an eye where the cone cell does not function well is known as Color Blindness. It differs from other common vision defects like myopia and hyperopia, which are related to the focusing of light rather than color perception.
Step-by-step explanation:
The defect of an eye where the cone cell does not function well is known as Color Blindness. Color blindness, also referred to as color vision deficiency, is a condition where an individual has difficulty distinguishing between certain colors. This issue typically results from an absence or malfunction of cone cells in the retina of the eye, which are responsible for color vision.
Common vision defects like myopia and hyperopia, which relate to difficulties focusing on distant or close objects, are different from color blindness. While these conditions are associated with how the eye converges light and brings it into focus, color blindness is specifically about the perception of color.