Paralytic squint is
**Core Concept**
Paralytic squint is a type of strabismus caused by paralysis of one or more extraocular muscles, leading to an abnormal alignment of the eyes. This condition is characterized by a loss of eye movement in one or more directions, resulting in an inability to align the eyes properly.
**Why the Correct Answer is Right**
The correct answer is related to the pathophysiology of paralytic squint, which occurs due to a disruption in the motor control of the extraocular muscles. This can be caused by a variety of factors, including cranial nerve palsies (such as third nerve palsy), muscle weakness, or neurological disorders. The affected muscle or muscles are unable to function properly, leading to an abnormal alignment of the eyes.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because paralytic squint is specifically caused by paralysis of one or more extraocular muscles, whereas other types of strabismus may be caused by other factors such as refractive errors or anatomical abnormalities.
**Option B:** This option is incorrect because paralytic squint is not caused by a lack of coordination between the eyes, but rather by a specific loss of muscle function.
**Option C:** This option is incorrect because paralytic squint is not a type of strabismus caused by a congenital condition, but rather by an acquired condition such as a cranial nerve palsy.
**Clinical Pearl / High-Yield Fact**
It's essential to distinguish between paralytic squint and other types of strabismus, as the underlying cause and treatment may differ significantly. A thorough medical history and physical examination, including a detailed assessment of eye movements, are crucial in diagnosing paralytic squint.
**Correct Answer:** C.