Amount of squint is different in different directions. This type of squint is called
**Core Concept**
The question is testing the understanding of **strabismus** types, specifically those where the angle of deviation varies with the direction of gaze. This concept is rooted in **ophthalmology** and **neuro-ophthalmology**, involving the **extraocular muscles** and their innervation.
**Why the Correct Answer is Right**
The correct answer is related to a type of strabismus where the amount of squint (or deviation) changes when looking in different directions. This is characteristic of **paralytic strabismus** or more specifically, **incomitant strabismus**, where the alignment of the eyes is not the same in all directions of gaze. This occurs due to imbalance in the **extraocular muscles** or their **cranial nerve** supply.
**Why Each Wrong Option is Incorrect**
**Option A:** Would be incorrect if it suggested a type of strabismus that does not account for varying deviation with gaze direction.
**Option B:** Might be incorrect if it referred to a condition like **concomitant strabismus**, where the angle of deviation remains constant in all directions of gaze.
**Option C:** Could be incorrect if it represented a condition not related to the variation of squint with gaze direction.
**Option D:** Would be incorrect if it did not accurately describe the condition where the amount of squint changes with the direction of gaze.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that **incomitant strabismus** often results from **cranial nerve palsies** (III, IV, or VI) affecting the **extraocular muscles**, leading to varying degrees of deviation in different gaze directions.
**Correct Answer:** D. Incomitant squint.