**Core Concept**
Tritanomaly refers to a condition where an individual has difficulty perceiving blue colors, but not a complete inability to do so. This condition is often associated with a mild deficiency in the long-wavelength cone cells in the retina, which are responsible for detecting blue light.

**Why the Correct Answer is Right**
Tritanomaly occurs due to a deficiency in the long-wavelength cone cells that detect blue light, which is typically associated with the X-linked recessive gene responsible for red-green color blindness. However, tritanomaly specifically involves blue color perception. This condition is often mild and may not significantly affect an individual's quality of life. The specific impact on blue color perception varies among affected individuals.

**Why Each Wrong Option is Incorrect**
**Option A:** Deuteranomaly refers to a condition where an individual has difficulty perceiving green colors, not blue colors. This condition is associated with a deficiency in the medium-wavelength cone cells.
**Option B:** Deuteranopia is a more severe condition than deuteranomaly, where an individual is completely unable to perceive green colors. This condition is also associated with a deficiency in the medium-wavelength cone cells.
**Option C:** Tritanopia is a condition where an individual is completely unable to perceive blue colors, which is a more severe condition than tritanomaly.

**Clinical Pearl / High-Yield Fact**
It's essential to differentiate between tritanomaly and tritanopia, as the severity of the condition can impact the individual's quality of life and treatment options.

**✓ Correct Answer: D. Tritanomalous**