**Core Concept**
Fuch's heterochromic iridocyclitis is a type of chronic, low-grade uveitis characterized by heterochromia of the iris, often with a sectoral distribution. It is associated with a poor visual prognosis and can lead to glaucoma.

**Why the Correct Answer is Right**
The correct answer is not a sign of Fuch's heterochromic iridocyclitis. Fuch's heterochromic iridocyclitis is typically associated with a lack of pain, minimal inflammation, and a characteristic sectoral heterochromia. The presence of significant pain or a marked reduction in vision would be unusual in Fuch's heterochromic iridocyclitis.

**Why Each Wrong Option is Incorrect**
**Option A:** Heterochromia of the iris is a hallmark sign of Fuch's heterochromic iridocyclitis, making this option incorrect.
**Option B:** Segmental keratic precipitates (KPs) are often seen in Fuch's heterochromic iridocyclitis, which makes this option incorrect.
**Option D:** Band keratopathy is not typically associated with Fuch's heterochromic iridocyclitis, but it can occur in other conditions such as chronic uveitis or systemic diseases.

**Clinical Pearl / High-Yield Fact**
Fuch's heterochromic iridocyclitis is often associated with a poor visual prognosis, especially if left untreated. Early recognition and treatment can help slow disease progression.

**Correct Answer: D. Band keratopathy is not typically associated with Fuch's heterochromic iridocyclitis.**