**Question:** Most common complication of extracapsular cataract surgery is:

A. Endophthalmitis
B. Hyphema
C. Corneal edema
D. Hypotony

**Core Concept:** Extracapsular cataract surgery is a surgical procedure used to remove a cataract from the eye. It involves incising the cornea, making an incision in the lens capsule, and removing the nucleus of the lens while leaving the lens cortex intact. Common complications can occur due to the nature of the surgery or the use of certain instruments.

**Why the Correct Answer is Right:** The most common complication of extracapsular cataract surgery is **D. Hypotony** (low intraocular pressure). Hypotony occurs when the intraocular pressure falls below the normal range (5-21 mmHg) due to excessive fluid leakage from the eye's posterior chamber into the anterior chamber. This can lead to severe damage to the optic nerve and other intraocular structures, potentially resulting in permanent vision loss.

**Why Each Wrong Option is Incorrect:**

A. **Endophthalmitis**: This refers to infection within the eye, which is not the most common complication of extracapsular cataract surgery. It is more commonly associated with intravitreal injections or primary cataract surgery.

B. **Hyphema**: A hemmorhage within the anterior chamber, not the most common complication of extracapsular cataract surgery. Hyphema is more likely to occur during phacoemulsification cataract surgery or in cases of blunt trauma to the eye.

C. **Corneal edema**: Corneal swelling due to fluid accumulation, which is not the most common complication of extracapsular cataract surgery. Corneal edema is more likely to occur in cases of viral keratitis or from prolonged use of topical steroids.

**Clinical Pearl:** It is crucial for surgeons to be aware of potential complications during cataract surgery and to monitor intraocular pressure, intraocular pressure, and intraocular inflammation to minimize the risk of hypotony and endophthalmitis. Informed decision-making and careful management of the surgical procedure can help reduce the likelihood of these complications and ensure optimal patient outcomes.