**Question:** Ex-Press glaucoma implant

**Core Concept:** The Ex-Press glaucoma implant is a minithimble-shaped device used in glaucoma surgery to reduce intraocular pressure (IOP). It is a minimally invasive glaucoma surgery (MIGS) procedure that works by facilitating outflow of aqueous humor from the eye.

**Why the Correct Answer is Right:**

The Ex-Press glaucoma implant (Option C) is a correct answer because it is a specific device used in glaucoma surgeries to lower intraocular pressure (IOP). Glaucoma surgery aims to reduce IOP by increasing the aqueous humor outflow through the trabecular meshwork, the site of outflow obstruction in open-angle glaucoma. The Ex-Press implant is designed to facilitate this process, thereby decreasing IOP and preventing further damage to the optic nerve and vision loss.

**Why Each Wrong Option is Incorrect:**

Option A and B are incorrect because they refer to different types of glaucoma surgery or devices, respectively. While MIGS (Minimally Invasive Glaucoma Surgery) and iStent (a type of MIGS) are important concepts in glaucoma management, they are not specific to the Ex-Press glaucoma implant.

Option D is incorrect because it is a general term for glaucoma surgery, but does not specifically identify the Ex-Press glaucoma implant as the correct answer.

**Why Each Wrong Option is Incorrect:**

Option A refers to the MIGS (Minimally Invasive Glaucoma Surgery) category rather than the specific Ex-Press glaucoma implant. MIGS is a broader term encompassing various types of glaucoma surgeries, some of which use the Ex-Press implant.

Option B is incorrect because it refers to another MIGS device, the iStent, which is a different device used for glaucoma treatment, not the Ex-Press implant.

**Clinical Pearl:** An Ex-Press glaucoma implant is one of the MIGS devices used to reduce intraocular pressure (IOP) in patients with glaucoma. By facilitating aqueous humor outflow through the trabecular meshwork, this implant helps prevent further vision loss due to glaucoma.

**Why Each Wrong Option is Incorrect:**

Option A refers to a different MIGS device (iStent), which is distinct from the Ex-Press implant.

Option B is incorrect because MIGS, as a category, does not specifically identify the Ex-Press implant. The Ex-Press implant is a specific device used to lower IOP in glaucoma patients.

**Why Each Wrong Option is Incorrect:**

Option C refers to the concept of glaucoma surgery, but does not mention the Ex-Press implant as the correct answer. Glaucoma surgery is a broad category, and the Ex-Press implant is a specific device within this category.

**Clinical Pearl:** The Ex-Press glaucoma implant is part of the MIGS (Minimally Invasive Glaucoma