Which of the following antiglaucoma drugs can cause heterochromia iridis
**Core Concept**
Heterochromia iridis, a condition characterized by uneven coloration of the iris, can be caused by various factors, including trauma, congenital conditions, and certain medications. In the context of antiglaucoma therapy, heterochromia iridis is a rare but recognized side effect of certain medications used to treat glaucoma.
**Why the Correct Answer is Right**
The correct answer is related to the use of prostaglandin analogs in the treatment of glaucoma. Prostaglandin analogs, such as latanoprost, work by increasing the outflow of aqueous humor from the eye, thereby reducing intraocular pressure. However, they can also cause changes in the pigmentation of the iris, leading to heterochromia iridis. This is due to the direct action of prostaglandin analogs on melanocytes in the iris, which can result in the deposition of melanin and subsequent changes in iris color.
**Why Each Wrong Option is Incorrect**
* **Option A:** Beta blockers, such as timolol, are commonly used in the treatment of glaucoma but are not associated with heterochromia iridis.
* **Option B:** Alpha agonists, such as brimonidine, can cause changes in iris pigmentation, but heterochromia iridis is not a well-documented side effect of these medications.
* **Option D:** Carbonic anhydrase inhibitors, such as acetazolamide, can cause a range of side effects, including changes in vision and eye color, but heterochromia iridis is not typically associated with these medications.
**Clinical Pearl / High-Yield Fact**
When prescribing prostaglandin analogs for glaucoma, it's essential to inform patients about the potential risk of heterochromia iridis and monitor for changes in iris pigmentation.
**Correct Answer: C. Latanoprost**