Which of the following is a cause of secondary angle closure glaucoma?
**Core Concept**
Secondary angle closure glaucoma occurs when there is a sudden increase in intraocular pressure (IOP) due to a mechanical blockage of the drainage angle in the eye, often caused by a posterior displacement of the iris. This can be triggered by various factors, such as inflammation, trauma, or tumors.
**Why the Correct Answer is Right**
The correct answer is a cause of secondary angle closure glaucoma because it leads to a posterior displacement of the iris, which can block the drainage angle and increase IOP. This can be due to the formation of a posterior synechiae (adhesions between the iris and lens), which can push the iris forward and block the trabecular meshwork.
**Why Each Wrong Option is Incorrect**
**Option A:** This is incorrect because it is a cause of primary open-angle glaucoma, which is a different type of glaucoma characterized by a slow increase in IOP due to a gradual blockage of the trabecular meshwork.
**Option B:** This is incorrect because it is a cause of primary angle closure glaucoma, which is a different type of glaucoma that is typically caused by a narrow drainage angle.
**Option C:** This is incorrect because it is a cause of secondary open-angle glaucoma, which is a different type of glaucoma characterized by a slow increase in IOP due to a blockage of the trabecular meshwork.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that secondary angle closure glaucoma can be caused by various factors, including inflammation, trauma, and tumors. A sudden increase in IOP can be a medical emergency, and prompt treatment is necessary to prevent vision loss.
**Correct Answer:** C.