Polychromatic lusture is seen in-
**Core Concept**
Polychromatic lustre is a characteristic feature of certain types of intraocular pathologies. It refers to the appearance of multiple colors, typically in a circular or ring-like pattern, within the iris or anterior chamber of the eye. This phenomenon is often associated with the presence of inflammation, injury, or other forms of ocular stress.
**Why the Correct Answer is Right**
Polychromatic lustre is typically seen in conditions where there is an abnormal accumulation of inflammatory cells, proteins, or other substances within the anterior chamber or iris. This can lead to the scattering of light, resulting in the characteristic multicolored appearance. In some cases, polychromatic lustre may be associated with conditions such as uveitis, iridocyclitis, or posterior synechiae. The correct answer is related to the condition that most commonly exhibits this characteristic.
**Why Each Wrong Option is Incorrect**
* **Option A:**
Polychromatic lustre is not typically seen in conditions characterized by a uniform or diffuse increase in intraocular pressure, such as glaucoma.
* **Option B:**
While certain types of cataracts may exhibit changes in light scattering, polychromatic lustre is not a characteristic feature of this condition.
* **Option C:**
Polychromatic lustre is not typically seen in conditions characterized by a uniform or diffuse decrease in intraocular transparency, such as vitritis.
**Clinical Pearl / High-Yield Fact**
Polychromatic lustre is often associated with conditions that involve inflammation or injury to the anterior segment of the eye, and its presence can be an important diagnostic clue in these cases.
**Correct Answer: C. Fuchs heterochromic iridocyclitis.**