**Question:** A feature of paralytic squint is - a) Detected by cover uncover test, b) Always divergent, c) Clinically called tropia, d) Associated with decreased vision.

**Core Concept:**
Paralytic squint, also known as a paresis squint or non-mechanical squint, is a type of squint that occurs due to a neurological disorder affecting the extraocular muscles. It can be caused by stroke, multiple sclerosis, or brain tumors, among other conditions. In these cases, the extraocular muscles are not weak but are unable to function correctly due to the neurological disorder.

**Why the Correct Answer is Right:**
The correct answer (a) Detected by cover uncover test is because paralytic squint is usually bilateral and the cover uncover test is a simple method to assess the symmetry of the extraocular muscles. The test involves alternately covering one eye while the other eye is fixed on a distant target. If the squint persists while one eye is covered, it indicates the presence of paralytic squint.

**Why Each Wrong Option is Incorrect:**

a) **Always divergent:** Not all paralytic squints are divergent. While some cases may present as divergent squint, others can be convergent or mixed. The term "always divergent" is incorrect as the direction of the squint depends on the side of the neurological disorder affecting the extraocular muscles.

b) **Always clinically called tropia:** The term "tropia" refers to a type of squint rather than a characteristic feature of paralytic squint. The correct term for paralytic squint is "paralytic squint," not tropia.

c) **Associated with decreased vision:** Decreased vision may be a secondary symptom due to the primary neurological disorder, but it is not a universal feature of paralytic squint. The primary concern in diagnosing paralytic squint is the presence of the squint itself, not vision-related symptoms.

d) **Associated with decreased vision:** Similar to option C, decreased vision is a potential symptom but not a defining feature of paralytic squint. The primary focus in diagnosing paralytic squint is the squint itself and its origin from a neurological disorder.

**Clinical Pearl:**
Paralytic squint is an essential clinical sign that alerts the physician to the presence of a neurological disorder affecting the extraocular muscles. This may lead to further investigations and diagnosis of the underlying cause. Involvement of the extraocular muscles can affect the patient's vision, eye position, and binocular vision. The presence of paralytic squint is crucial for the differential diagnosis process.

**Why the Correct Answer is Right:**
The correct answer (a) Detected by cover uncover test is because this test helps in identifying the direction of the squint (convergent or divergent) and assessing the symmetry of the extraocular muscles. This information is crucial in determining the underlying neurological cause and guiding further diagnostic workup.

**Why Each Wrong Option is Incorrect:**

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