## **Core Concept**
Topical beta blockers are commonly used in the treatment of glaucoma to decrease intraocular pressure (IOP) by reducing aqueous humor production. However, their use can be contraindicated in certain conditions due to the systemic effects of beta blockers.

## **Why the Correct Answer is Right**
The correct answer, **C. Asthma**, is a contraindication for topical beta blockers because these medications can cause bronchoconstriction by blocking beta-2 receptors in the lungs, which are responsible for dilating airways. Non-selective beta blockers, in particular, can precipitate bronchospasm in patients with asthma or chronic obstructive pulmonary disease (COPD).

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is not provided, so it cannot be evaluated.
- **Option B:** This option is not provided, so it cannot be evaluated.
- **Option D:** This option is not provided, so it cannot be evaluated.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that patients with asthma or COPD are at risk of bronchospasm with non-selective topical beta blockers. Always consider the patient's respiratory history before prescribing these medications.

## **Correct Answer: C. Asthma**