A patient having glaucoma develops blepharoconjunctivitis after instilling some antiglaucoma drug. Which of the following drug can be responsible for it –
**Core Concept**
Glaucoma is a group of eye conditions that damage the optic nerve, often due to abnormally high pressure in the eye. Blepharoconjunctivitis refers to inflammation of the eyelids and conjunctiva, which can be triggered by various factors, including certain medications. In this context, we are looking for an antiglaucoma medication that may cause blepharoconjunctivitis as a side effect.
**Why the Correct Answer is Right**
The correct answer is likely a medication that contains a preservative, which can cause irritation and inflammation of the ocular surface. One common preservative used in antiglaucoma medications is benzalkonium chloride. This surfactant can disrupt the tear film and lead to blepharoconjunctivitis in susceptible individuals. The exact mechanism involves the disruption of the lipid layer of the tear film, allowing water to penetrate and causing irritation and inflammation.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not provided.
* **Option B:** This option is not provided.
* **Option C:** This option is not provided.
**Clinical Pearl / High-Yield Fact**
When treating glaucoma, it's essential to consider the potential side effects of medications, especially those containing preservatives. Patients with pre-existing ocular surface disease or those with a history of blepharoconjunctivitis may be more susceptible to adverse reactions. Look for preservative-free formulations or consider alternative treatments when possible.
**Correct Answer:** C.