All except one predispose to angle closure glaucoma:
## Core Concept
Angle closure glaucoma occurs when the iris blocks the drainage angle of the eye, preventing aqueous humor from flowing out. This can happen due to various anatomical or pathological conditions that cause the iris to be pushed forward or to bulge forward, thereby narrowing or closing the angle between the iris and the cornea.
## Why the Correct Answer is Right
The correct answer, , is associated with conditions that typically do not cause angle closure glaucoma. Myopia (nearsightedness) is generally associated with a longer axial length of the eye. This longer length often results in a thinner retina and a more open angle, reducing the risk of angle closure glaucoma compared to conditions that lead to a crowded anterior segment.
## Why Each Wrong Option is Incorrect
* **Option A:** is incorrect because it can indeed predispose to angle closure glaucoma. Hypermetropia (farsightedness) is associated with a shorter axial length, which can lead to a more crowded anterior segment and a narrower angle, increasing the risk of angle closure.
* **Option B:** is incorrect because it is a known risk factor for angle closure glaucoma. A mature cataract can cause the lens to swell, pushing the iris forward and narrowing the angle.
* **Option C:** is incorrect because it can also predispose to angle closure glaucoma. Plate-like or "iris plateau" configuration can cause the peripheral iris to block the trabecular meshwork, leading to angle closure.
## Clinical Pearl / High-Yield Fact
A key point to remember is that myopia (nearsightedness) generally protects against angle closure glaucoma due to the longer axial length of the eye, which tends to keep the angle open. This is in contrast to hypermetropia, which increases the risk.
## Correct Answer: D.