A person has defective blue colour appreciation. His condition is better named as –
**Core Concept**
The condition described involves a defect in color appreciation, specifically the inability to perceive the color blue. This is a form of color vision deficiency, which affects the way an individual perceives colors. In this case, it is a specific type of color vision deficiency that affects the perception of blue colors.
**Why the Correct Answer is Right**
The condition is likely Deuteranopia, a type of red-green color blindness where the affected individual has difficulty perceiving blue colors. This is because the condition affects the long-wavelength sensitive cones in the retina, which are responsible for detecting red light. However, it is worth noting that the condition is often referred to as a type of blue-blindness, as the affected individual has difficulty perceiving blue colors. This is because the condition affects the cone cells that are sensitive to long-wavelength light (600-700 nanometers), which includes the blue-violet end of the visible spectrum.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specifically describe a condition where the individual has difficulty perceiving blue colors.
**Option B:** This option is incorrect because it is not a recognized condition related to color vision deficiency.
**Option C:** This option is incorrect because it is not a specific type of color vision deficiency that affects blue color perception.
**Clinical Pearl / High-Yield Fact**
It's worth noting that color vision deficiency can be inherited in an X-linked recessive pattern, which means that it is more common in males than females.
**Correct Answer:** C.