Neuro-Ophthalmology Practice Questions

Q: Typical clinical features of Horner's syndrome include all except?

Dilated pupil. **Explanation:** Horner’s syndrome results from a **disruption of the sympathetic nerve supply** to the eye and face. Under normal physiological conditions, the sympathetic system is responsible for pupillary dilation (via the dilator pupillae muscle). **Why "Dilated Pupil" is the correct answer:** In Horner’s syndrome, the loss of sympathetic innervation leads to unopposed parasympathetic action. This results in **Miosis (a constricted pupil)**, not a dilated pupil. Therefore, a dilated pupil is the "except" in this clinical presentation. **Analysis of other options:** * **Ptosis:** Caused by paralysis of the **Müller’s muscle** (superior tarsal muscle), which is sympathetically innervated. This is typically a "partial ptosis." * **Enophthalmos:** The appearance of a sunken eyeball occurs due to the narrowing of the palpebral fissure (pseudo-enophthalmos). * **Nasal Stuffiness:** Sympathetic nerves cause vasoconstriction of the nasal mucosa. Loss of this tone leads to **vasodilation and vascular engorgement** of the nasal lining, resulting in stuffiness. **High-Yield Clinical Pearls for NEET-PG:** * **The Classic Triad:** Miosis, Partial Ptosis, and Anhidrosis (loss of sweating). * **Heterochromia Iridum:** If Horner’s is congenital, the affected eye may have a different iris color (lighter) due to the role of sympathetics in melanin deposition. * **Causative Pathology:** Often associated with **Pancoast tumors** (superior sulcus tumor of the lung) involving the stellate ganglion. * **Pharmacological Test:** Cocaine drops fail to dilate a Horner’s pupil, confirming the diagnosis.

Q: A 23-year-old woman presents with irregular pupils noted on routine examination. She has one large pupil which shows minimal response to light stimulation but does respond to accommodation. Eye movements are normal and she experiences no double vision. What is the most likely diagnosis for this patient's pupillary abnormality?

Tonic pupils (Holmes-Adie syndrome). ### Explanation The patient presents with a classic case of **Holmes-Adie Syndrome (Tonic Pupil)**. This condition is characterized by a benign, typically unilateral (80% of cases) dilated pupil that exhibits **light-near dissociation**. **1. Why Tonic Pupil is Correct:** The underlying pathology is a lesion or degeneration of the **ciliary ganglion** or postganglionic parasympathetic fibers [1]. Because the fibers responsible for accommodation are more numerous and regenerate more effectively than those for light reflex, the pupil shows a minimal/slow response to light but a slow, prolonged ("tonic") response to accommodation [2]. The absence of ptosis or extraocular muscle palsy rules out a 3rd nerve lesion. **2. Why Other Options are Incorrect:** * **Essential Anisocoria:** This is a physiological variation where the difference in pupil size remains constant in both bright and dim light. The pupils react normally to light. * **Horner Syndrome:** This presents with a **miotic (small) pupil**, not a large one. It is also associated with ptosis and anhidrosis [1]. * **Argyll Robertson Pupil:** Classically seen in neurosyphilis, these are typically **bilateral and small ("prostitute's pupils")**. While they also show light-near dissociation, the pupils in this case are large. **3. High-Yield Clinical Pearls for NEET-PG:** * **Holmes-Adie Syndrome:** Tonic pupil + absent/depressed deep tendon reflexes (usually Achilles). * **Pharmacological Test:** Adie’s pupil shows **denervation supersensitivity**. It will constrict with very dilute **Pilocarpine (0.125%)**, whereas a normal pupil will not. * **Demographics:** Most common in young women (20–40 years). * **Mnemonic for Argyll Robertson:** **A**ccommodation **R**eflex **P**resent, **P**upillary **A**reflexia to light (**ARP/PA**).

Q: What is the most common cranial nerve involved in ophthalmoplegic migraine?

Oculomotor nerve (III). **Explanation:** **Ophthalmoplegic Migraine** (now classified by the ICHD-3 as **Recurrent Painful Ophthalmoplegic Neuropathy**) is a rare clinical entity characterized by recurrent bouts of headache associated with the paresis of one or more ocular cranial nerves. 1. **Why Oculomotor Nerve (III) is correct:** The **Oculomotor nerve (III)** is the most frequently affected nerve, involved in approximately **80% of cases**. The pathophysiology is thought to involve a demyelinating or inflammatory process of the nerve rather than a typical vascular migraine mechanism. Patients typically present with ptosis and external ophthalmoplegia (limited eye movements), often involving the pupil (internal ophthalmoplegia). 2. **Why the other options are incorrect:** * **Optic nerve (II):** This is a sensory nerve for vision. While migraines can cause visual auras, the optic nerve is not involved in the motor paralysis seen in ophthalmoplegic migraine. * **Trigeminal nerve (V):** This nerve carries sensory information from the face and motor fibers to muscles of mastication. While it mediates the pain (headache) component, it is not the nerve responsible for the ophthalmoplegia. * **Abducens nerve (VI):** This is the second most common nerve involved, but it is significantly less frequent than the 3rd nerve. **High-Yield Clinical Pearls for NEET-PG:** * **Age of Onset:** Unlike typical migraines, this condition often starts in **childhood** (usually <10 years). * **Temporal Sequence:** The ophthalmoplegia (paralysis) usually follows the headache by days or even weeks. * **Diagnosis of Exclusion:** Because it mimics serious conditions, **MRI with contrast** is mandatory to rule out compressive lesions (like aneurysms of the Posterior Communicating Artery) or Tolosa-Hunt Syndrome. * **Treatment:** Corticosteroids may be beneficial if started early in the course of the attack.

Q: Optic nerve glioma is seen in?

A. NF-1. ***NF-1***- **Optic pathway gliomas (OPGs)** are hallmark features of **Neurofibromatosis type 1 (NF-1)**, an autosomal dominant disorder caused by a mutation in the *NF1* gene on chromosome 17.- OPGs are typically low-grade **pilocytic astrocytomas** and commonly present in children under 6 years of age. *Tuberous sclerosis*- The most characteristic CNS tumor in patients with **Tuberous Sclerosis Complex (TSC)** is the **subependymal giant cell astrocytoma (SEGA)**, usually near the foramen of Monro.- TSC is associated with **retinal astrocytic hamartomas** (phakomas), not primary optic nerve gliomas. *NF-2*- **Neurofibromatosis type 2 (NF-2)** is characterized by **bilateral vestibular schwannomas** (acoustic neuromas), which is the diagnostic criterion.- Other common tumors in NF-2 include meningiomas, ependymomas, and other cranial or spinal schwannomas, but rarely **optic nerve gliomas**. *Schwannoma*- A **schwannoma** is a tumor arising from Schwann cells, often seen on peripheral nerves or cranial nerves (like CN VIII in NF-2).- The optic nerve is considered part of the CNS (a tract of the diencephalon) and is myelinated by oligodendrocytes, meaning **schwannomas** are not primary tumors of the optic nerve itself.

Q: A patient presents with a down and out right eye with ptosis since birth. What is the nerve palsy?

3rd nerve palsy. ***3rd nerve palsy (Correct Answer)*** - The **oculomotor nerve (CN III)** supplies the levator palpebrae superioris, leading to **ptosis**, and most extraocular muscles (superior rectus, medial rectus, inferior rectus, and inferior oblique) - When CN III is paralyzed, the unopposed actions of **CN IV (superior oblique)** and **CN VI (lateral rectus)** pull the eye into the characteristic **"down and out"** position - **Congenital 3rd nerve palsy** presents with ptosis and the down-and-out eye position from birth - This is the classic triad: **ptosis + down and out eye + dilated pupil** (if pupil-involving) *4th nerve palsy (Incorrect)* - Palsy of the **trochlear nerve (CN IV)** affects only the superior oblique muscle - Presents with impaired **downward and inward movement** and **intorsion** - Typically causes **vertical diplopia** (especially on downward gaze) and compensatory **head tilt** to the opposite side - Does **NOT** cause ptosis or the pronounced "down and out" position *6th nerve palsy (Incorrect)* - Palsy of the **abducens nerve (CN VI)** affects only the lateral rectus muscle - Causes failure of **abduction** (outward movement), resulting in the eye being pulled **inward** (esotropia) - Does **NOT** cause ptosis or downward deviation of the eye *7th nerve palsy (Incorrect)* - The **facial nerve (CN VII)** controls facial muscles, including orbicularis oculi - Causes **lagophthalmos** (inability to close the eyelid) and facial weakness, NOT ptosis - Does **NOT** affect extraocular movements or eye position

Q: A patient with pituitary adenoma compressing the optic chiasma now presents with loss of visual field. What visual field defect will be seen in the patient?

Bitemporal hemianopia. ***Bitemporal hemianopia*** - A **pituitary adenoma** most commonly compresses the **optic chiasma**, where the nasal retinal fibers from both eyes decussate (cross over). - Damage to these crossing fibers specifically leads to the loss of the **temporal visual fields** in both eyes, which is the definition of bitemporal hemianopia. *Homonymous anopia* - This is a less specific term. **Homonymous** defects refer to the loss of the same side of the visual field in both eyes (e.g., the left side in both eyes). - These types of defects are caused by lesions located **posterior** (behind) the optic chiasma, not at the chiasma itself. *Homonymous hemianopia* - This defect describes the loss of the same half (either left or right) of the visual field in both eyes. - It results from a lesion in the visual pathway **posterior** to the optic chiasma, such as in the **optic tract**, **optic radiations**, or the **visual cortex**. *Superior quadrantanopia* - This refers to the loss of vision in the upper quadrant of the visual field, often described as a "pie in the sky" defect. - This is typically caused by a lesion affecting the contralateral **temporal lobe** (damaging **Meyer's loop** of the optic radiation), not the optic chiasma.

Q: What is the probable diagnosis for a patient who exhibits miosis, anhidrosis, mild ptosis, and a persistent small pupil even in low light conditions?

Horner syndrome. No changes were made to the text as none of the provided references reached the relevance threshold of 7/10 for the specific topic of Horner syndrome diagnosis and its differentials. The provided references largely discussed coagulation (mislabeled chapters), neurological signs of intracranial pressure, or general pupillary reflexes without specific diagnostic criteria for Horner syndrome or its differentiating features like anhidrosis.

Q: A patient presents with right-sided field defects in both eyes, but central vision remains unaffected. What is the most likely diagnosis?

Homonymous Hemianopia with Macular Sparing. ***Homonymous Hemianopia with Macular Sparing*** - **Homonymous hemianopia** refers to a visual field defect on the same side in both eyes (in this case, the right side), which precisely matches the patient's presentation. - **Macular sparing** occurs because the occipital pole, which processes central vision, often has a dual blood supply from both the **posterior cerebral artery (PCA)** and the **middle cerebral artery (MCA)**, protecting it during a stroke affecting one vessel. *Heteronymous Hemianopia with Central Sparing* - **Heteronymous hemianopia** involves defects on opposite sides of the visual field in each eye (e.g., loss of both temporal fields), which is inconsistent with the patient's right-sided defect in both eyes. - This type of defect is classically caused by a lesion at the **optic chiasm**, such as a pituitary adenoma, leading to **bitemporal hemianopia**. *Optic Chiasm Lesion* - A lesion compressing the optic chiasm, where the nasal retinal fibers cross, typically causes **bitemporal hemianopia** (loss of peripheral vision in both eyes). - This results in a **heteronymous** defect, not a **homonymous** one as described in the question. *Optic Tract Lesion* - A lesion in the optic tract (posterior to the chiasm) does cause a contralateral **homonymous hemianopia**. - However, lesions in the optic tract typically do not spare the macula, as the fibers from the macula are intermingled with other fibers at this point. Macular sparing points towards a more posterior lesion in the **visual cortex**.

Question 1

Homonymous hemianopia with sparing of pupillary reflexes is a feature of lesions of which of the following?

Accepted Answer

All of the above

Answer

Lateral geniculate body

Answer

Optic radiations

Answer

Visual cortex

Question 2

Lesion of the optic tract causes which visual field defect?

Accepted Answer

Homonymous hemianopia

Answer

Binasal hemianopia

Answer

Bitemporal hemianopia

Answer

Homonymous superior quadrantanopia

Question 3

Typical clinical features of Horner's syndrome include all except?

Accepted Answer

Dilated pupil

Answer

Ptosis

Answer

Enophthalmos

Answer

Nasal stuffiness

Question 4

A 23-year-old woman presents with irregular pupils noted on routine examination. She has one large pupil which shows minimal response to light stimulation but does respond to accommodation. Eye movements are normal and she experiences no double vision. What is the most likely diagnosis for this patient's pupillary abnormality?

Accepted Answer

Tonic pupils (Holmes-Adie syndrome)

Answer

Essential anisocoria

Answer

Horner syndrome

Answer

Argyll Robertson pupils

Question 5

What is the most common cranial nerve involved in ophthalmoplegic migraine?

Accepted Answer

Oculomotor nerve (III)

Answer

Optic nerve (II)

Answer

Trigeminal nerve (V)

Answer

Abducens nerve (VI)

Question 6

Optic nerve glioma is seen in?

Accepted Answer

A. NF-1

Answer

B. Tuberous sclerosis

Answer

C. NF-2

Answer

D. Schwannoma

Question 7

A patient presents with a down and out right eye with ptosis since birth. What is the nerve palsy?

Accepted Answer

3rd nerve palsy

Answer

4th nerve palsy

Answer

6th nerve palsy

Answer

7th nerve palsy

Question 8

A patient with pituitary adenoma compressing the optic chiasma now presents with loss of visual field. What visual field defect will be seen in the patient?

Accepted Answer

Bitemporal hemianopia

Answer

Superior quadrantanopia

Answer

Homonymous hemianopia

Answer

Homonymous anopia

Question 9

What is the probable diagnosis for a patient who exhibits miosis, anhidrosis, mild ptosis, and a persistent small pupil even in low light conditions?

Accepted Answer

Horner syndrome

Answer

Argyll Robertson pupil

Answer

Marcus Gunn pupil

Answer

Adie's tonic pupil

Question 10

A patient presents with right-sided field defects in both eyes, but central vision remains unaffected. What is the most likely diagnosis?

Accepted Answer

Homonymous Hemianopia with Macular Sparing

Answer

Optic Tract Lesion

Answer

Heteronymous Hemianopia with Central Sparing

Answer

Optic Chiasm Lesion

Neuro-Ophthalmology — MCQs

Neuro-Ophthalmology — MCQs

On this page

Practice by Chapter

Want unlimited practice?