## **Core Concept**
Chronic iridocyclitis, also known as chronic anterior uveitis, is a form of uveitis characterized by inflammation of the iris and ciliary body. The condition can lead to various complications if not properly managed. A key aspect of managing uveitis is monitoring its activity.

## **Why the Correct Answer is Right**
The correct answer, **. Posterior synechiae**, indicates that the presence of posterior synechiae is a sign of activity in chronic iridocyclitis. Posterior synechiae are adhesions between the iris and the lens (or vitreous in aphakic eyes) that form as a result of inflammation. Their presence suggests active inflammation.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because it does not accurately represent a recognized sign of activity in chronic iridocyclitis.
- **Option B:** Similarly, this option does not correspond to a known indicator of active inflammation in this context.
- **Option D:** This option is also incorrect as it does not specify a valid sign of activity.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that **posterior synechiae** are not only a complication but also a sign of active inflammation in iridocyclitis. Their presence necessitates careful management to prevent further complications, such as irregular pupil shape and secondary glaucoma.

## **Correct Answer:** . Posterior synechiae