All of the following are true for the Adie’s Tonic Pupil except:
**Core Concept**
Adie's tonic pupil is a disorder of the autonomic nervous system that affects the pupil's constriction and dilation. It is characterized by a tonic pupil that reacts poorly to light and accommodation, but responds well to near vision.
**Why the Correct Answer is Right**
Adie's tonic pupil is caused by a denervation of the parasympathetic nerves that supply the iris sphincter muscle. The iris sphincter muscle is responsible for pupil constriction, and its denervation leads to a tonic pupil that reacts poorly to light but responds well to near vision due to the intact ciliary ganglion. This results in a pupil that dilates slowly in response to light but constricts rapidly in response to near vision.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is not true for Adie's tonic pupil. The correct answer is not provided, but we can assume it is incorrect.
**Option B:** This option is incorrect because it is actually true for Adie's tonic pupil. The tonic pupil is characterized by a poor light reflex and a good near reflex.
**Option C:** This option is incorrect because it is actually true for Adie's tonic pupil. The tonic pupil is characterized by a slow dilation in response to light.
**Option D:** This option is incorrect because it is actually true for Adie's tonic pupil. The tonic pupil is characterized by a normal pupil size in the dark.
**Clinical Pearl / High-Yield Fact**
Adie's tonic pupil is often associated with other autonomic nervous system disorders, such as Horner's syndrome and Holmes-Adie syndrome. It is essential to consider these conditions when evaluating a patient with a tonic pupil.
**Correct Answer: B. This option is incorrect because it is actually true for Adie's tonic pupil. The tonic pupil is characterized by a poor light reflex and a good near reflex.**