**Core Concept**
Uncrossed diplopia, also known as pseudoheterophoria, is a type of double vision that occurs when there is an imbalance between the binocular vision system and the motor strength of the extraocular muscles. This condition arises due to the brain's inability to fuse images from the two eyes when they are not aligned properly.

**Why the Correct Answer is Right**
In uncrossed diplopia, the images seen by each eye are not aligned, resulting in double vision. This is often caused by a weakness of the lateral rectus muscle, which is responsible for outward eye movement. When the lateral rectus muscle is weakened, the eye tends to turn inward, causing the images to be misaligned. The brain attempts to compensate for this misalignment by suppressing the image from one eye, resulting in pseudoheterophoria.

**Why Each Wrong Option is Incorrect**
* **Option A:** Uncrossed diplopia is not typically associated with esotropia, which is characterized by inward deviation of the eye.
* **Option B:** Convergent strabismus is a type of crossed diplopia, where the images seen by each eye are not aligned due to outward deviation of the eye.
* **Option C:** Divergent strabismus is also a type of crossed diplopia, where the images seen by each eye are not aligned due to inward deviation of the eye.

**Clinical Pearl / High-Yield Fact**
Uncrossed diplopia can be differentiated from crossed diplopia by the direction of the deviation. In uncrossed diplopia, the weaker eye tends to deviate outward, while in crossed diplopia, the weaker eye tends to deviate inward.

**Correct Answer:** C.