## **Core Concept**
Iris cysts are abnormal, fluid-filled structures that can form on the iris. They are often associated with chronic uveitis or other inflammatory conditions of the eye. The prevention of iris cysts involves addressing the underlying causes and using specific treatments to reduce inflammation.

## **Why the Correct Answer is Right**
Anticholinergic agents, such as cyclopentolate and atropine, are used to prevent the formation of iris cysts, particularly in the context of uveitis. These medications work by inducing **pupillary dilation**, which helps to prevent the formation of synechiae (adhesions) between the iris and the lens. By reducing inflammation and preventing synechiae, anticholinergic agents can help prevent the formation of iris cysts.

## **Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because while corticosteroids may help reduce inflammation in the eye, they do not directly prevent iris cysts from forming.
* **Option B:** This option is incorrect because antibiotics are used to treat bacterial infections, not to prevent iris cysts.
* **Option D:** This option is incorrect because while antihistamines may be used to treat allergic reactions, they are not typically used to prevent iris cysts.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that **atropine** is often used in the treatment of uveitis not only to dilate the pupil and prevent synechiae but also to help prevent the formation of iris cysts. Atropine is a type of anticholinergic agent.

## **Correct Answer:** . Atropine