Neuro-Ophthalmology Practice Questions

Q: Which of the following is NOT a clinical feature of Leber hereditary optic neuropathy?

Affected males can transmit the disease to their offspring.. **Explanation:** **Leber Hereditary Optic Neuropathy (LHON)** is a classic example of **mitochondrial inheritance** (maternal inheritance). 1. **Why Option C is the correct answer (The False Statement):** In mitochondrial inheritance, the disease is transmitted exclusively through the mother. This is because mitochondria in the developing embryo are derived entirely from the ovum; the sperm contributes only nuclear DNA. Therefore, while an affected mother can pass the mutation to all her children, **affected males cannot transmit the disease to any of their offspring.** 2. **Analysis of Incorrect Options (True Statements about LHON):** * **Option A:** LHON typically affects young males, most commonly presenting in the **second or third decade** of life (15–35 years). * **Option B:** It presents as **painless, subacute** (often perceived as sudden or gradual) visual loss. It usually starts in one eye, followed by the other eye weeks or months later. * **Option C:** A hallmark of the acute phase is **pseudo-papilledema** (telangiectatic microangiopathy). Despite the hyperemic appearance of the disc, there is **no leakage of dye** on Fluorescein Angiography (FFA), which helps differentiate it from true papilledema or optic neuritis. **High-Yield Clinical Pearls for NEET-PG:** * **Genetic Mutations:** Most common mutations involve mitochondrial DNA at positions **11778** (most common), 3460, and 14484. * **Visual Field:** Typically shows a **centrocecal scotoma**. * **Risk Factors:** Alcohol and tobacco consumption can trigger or worsen visual loss in carriers. * **Prognosis:** The 14484 mutation has the highest rate of spontaneous visual recovery.

Q: Integrity of the optic nerve is tested by which of the following methods, except?

Electroretinography (ERG). **Explanation:** The integrity of the optic nerve is assessed by evaluating the visual pathway from the retinal ganglion cells to the visual cortex. **Why Electroretinography (ERG) is the correct answer:** ERG measures the electrical response of the **outer layers of the retina** (specifically photoreceptors and bipolar cells) to light stimulation. It is used to diagnose retinal diseases like Retinitis Pigmentosa. Since it reflects the health of the retina and not the conduction of the nerve fibers, it is **not** a test for optic nerve integrity. *(Note: A specific type called Pattern ERG can assess ganglion cells, but standard ERG does not.)* **Why the other options are incorrect:** * **Visually Evoked Response (VER/VEP):** This is the most objective test for optic nerve function. It records the electrical potentials of the occipital cortex in response to visual stimuli. Any delay in latency (e.g., in Multiple Sclerosis) or decrease in amplitude indicates optic nerve pathology. * **Perimetry & Tangent Screen:** Both are methods of **Visual Field Testing**. Since the optic nerve carries all visual information from the retina, any damage to the nerve (like Glaucoma or Optic Neuritis) results in specific visual field defects (scotomas). Tangent screens are used for the central 30-degree field, while automated perimetry is the modern gold standard. **Clinical Pearls for NEET-PG:** * **EOG (Electro-oculography):** Measures the standing potential between the cornea and retina; it is abnormal in **Best’s Disease** (RPE dysfunction). * **Marcus Gunn Pupil (RAPD):** The most important clinical bedside test for unilateral optic nerve dysfunction. * **Friedmann Visual Field Analyser:** Another method for perimetry, often used for screening.

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.

Question 1

Which of the following is NOT a clinical feature of Leber hereditary optic neuropathy?

Accepted Answer

Affected males can transmit the disease to their offspring.

Answer

Typically presents in the second or third decade of life.

Answer

Characterized by gradual, painless visual loss.

Answer

No leakage of dye is observed in fluorescein angiography.

Question 2

Integrity of the optic nerve is tested by which of the following methods, except?

Accepted Answer

Electroretinography (ERG)

Answer

Tangent Screen examination

Answer

Visually Evoked Response (VER)

Answer

Perimetry

Question 3

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 4

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 5

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

Accepted Answer

Dilated pupil

Answer

Ptosis

Answer

Enophthalmos

Answer

Nasal stuffiness

Question 6

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 7

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 8

Optic nerve glioma is seen in?

Accepted Answer

A. NF-1

Answer

B. Tuberous sclerosis

Answer

C. NF-2

Answer

D. Schwannoma

Question 9

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 10

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

Neuro-Ophthalmology — MCQs

Neuro-Ophthalmology — MCQs

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