Neuro-Ophthalmology Practice Questions

Q: In optic neuritis in children, which of the following symptoms is typically NOT present?

Headache and vomiting. **Explanation:** Optic neuritis is an inflammatory condition of the optic nerve. While the clinical presentation in children differs slightly from adults (often being bilateral and post-viral), the core ophthalmic signs remain consistent with optic nerve dysfunction. **Why "Headache and Vomiting" is the correct answer:** Headache and vomiting are classic signs of **increased intracranial pressure (ICP)**, seen in conditions like papilledema or brain tumors. Optic neuritis is a localized inflammation of the optic nerve and does not typically cause systemic neurological symptoms or raised ICP. If a child presents with optic disc swelling along with headache and vomiting, the clinician should suspect papilledema rather than optic neuritis. **Analysis of Incorrect Options:** * **Afferent Pupillary Defect (APD):** This is a hallmark of unilateral or asymmetric optic nerve disease. Even in children, a Relative Afferent Pupillary Defect (RAPD) is a primary clinical sign of optic neuritis. * **Pain on movement of the eyeball:** In about 90% of cases, the inflammation involves the optic nerve sheath, which is attached to the recti muscles. Traction on the inflamed sheath during eye movement causes characteristic retrobulbar pain. * **Sudden vision loss:** Optic neuritis typically presents with an acute to subacute drop in visual acuity, often reaching its nadir within days. **NEET-PG High-Yield Pearls:** * **Pediatric vs. Adult:** Pediatric optic neuritis is more commonly **bilateral** and often follows a **viral prodrome** or vaccination. In adults, it is more frequently unilateral and strongly associated with Multiple Sclerosis. * **Fundus Findings:** Children more commonly present with **Papillitis** (visible disc edema), whereas adults more commonly have **Retrobulbar Neuritis** (normal-looking disc initially). * **Marcus Gunn Pupil:** Another name for the Relative Afferent Pupillary Defect (RAPD) seen in these patients.

Q: Epiphora and lagophthalmos following VII nerve injury is due to?

Failure of the lacrimal pump. ### Explanation **Correct Option: A. Failure of the lacrimal pump** The **Facial Nerve (VII)** innervates the **Orbicularis Oculi** muscle. This muscle is not only responsible for eyelid closure but also plays a critical role in the **lacrimal pump mechanism**. When we blink, the contraction of the pretarsal and preseptal fibers of the orbicularis oculi creates a negative pressure in the lacrimal sac, sucking tears from the conjunctival cul-de-sac into the sac via the canaliculi. In VII nerve palsy, the paralysis of the orbicularis oculi leads to: 1. **Lagophthalmos:** Inability to close the eyelids. 2. **Failure of the lacrimal pump:** Tears are no longer actively pumped into the nasolacrimal system, leading to overflow (**Epiphora**), even if the drainage pathway is anatomically patent. --- ### Why other options are incorrect: * **B. Increased lacrimal secretion:** VII nerve injury (proximal to the geniculate ganglion) actually causes **decreased** lacrimation due to involvement of the greater petrosal nerve (parasympathetic supply). Epiphora here is due to poor drainage, not overproduction. * **C. Nasolacrimal duct (NLD) obstruction:** This is a mechanical blockage (e.g., dacryocystitis). In VII nerve palsy, the duct is usually open, but the "pump" that moves tears toward the duct is broken. --- ### NEET-PG High-Yield Pearls: * **Bell’s Palsy:** The most common cause of lower motor neuron VII nerve palsy. * **Exposure Keratitis:** The most serious complication of lagophthalmos due to constant corneal drying. * **Horners Muscle:** A component of the orbicularis oculi that helps in dilating the lacrimal sac; its paralysis is central to lacrimal pump failure. * **Management:** Temporary measures include artificial tears and taping the eye; surgical intervention may involve **Tarsorrhaphy**.

Q: Fundoscopy of a patient shows a chalky white optic disc with well-defined margins. The retinal vessels and surrounding retina appear normal. Which of the following is the most likely diagnosis?

Primary optic atrophy. **Explanation:** The clinical presentation of a **chalky white disc** with **well-defined margins** and normal-appearing retinal vessels is the hallmark of **Primary Optic Atrophy**. **1. Why Primary Optic Atrophy is correct:** Primary optic atrophy occurs due to lesions proximal to the optic disc (e.g., pituitary tumors, retrobulbar neuritis, or traumatic optic neuropathy) without preceding disc edema. Because there was no prior inflammation or swelling at the nerve head, the disc margins remain sharp and distinct. The "chalky white" appearance results from the loss of axonal fibers and capillary supply (pre-laminar blood flow), while the surrounding retina and vessels remain unaffected. **2. Why the other options are incorrect:** * **Post-neuritic (Secondary) Optic Atrophy:** This follows chronic papilledema or papillitis. The disc margins are **blurred/smudged** due to fibroglial proliferation, and the physiological cup is often obliterated. * **Glaucomatous Optic Atrophy:** Characterized by specific morphological changes like **increased cup-to-disc ratio**, bayoneting sign, and nasalization of vessels, rather than a simple chalky white flat disc. * **Consecutive Optic Atrophy:** This follows extensive retinal disease (e.g., Retinitis Pigmentosa). The disc appears **waxy yellow**, and the retinal vessels show significant **attenuation (narrowing)**. **Clinical Pearls for NEET-PG:** * **Primary:** White disc, clear margins (e.g., Multiple Sclerosis, Tobacco amblyopia). * **Secondary:** Dirty grey/white disc, blurred margins (e.g., Long-standing Papilledema). * **Consecutive:** Waxy yellow disc, attenuated vessels (e.g., Retinitis Pigmentosa, Central Retinal Artery Occlusion). * **Kestenbaum’s Sign:** A decrease in the number of small vessels crossing the disc margin (normally 10–12), seen in optic atrophy.

Q: Optic neuritis is caused by the following, except:

Steroid therapy. **Explanation:** The correct answer is **Steroid therapy**. In fact, intravenous corticosteroids (specifically Methylprednisolone) are the **standard treatment** for acute optic neuritis to accelerate visual recovery, as established by the Optic Neuritis Treatment Trial (ONTT). Steroids do not cause optic neuritis; they treat the underlying inflammation. **Analysis of Options:** * **Ethambutol (Option A):** A classic antitubercular drug known for causing **dose-dependent toxic optic neuropathy** (retrobulbar neuritis). It typically presents with central scotomas and red-green color blindness. * **Chloroquine (Option B):** While primarily known for "Bull’s eye maculopathy," chloroquine and hydroxychloroquine can also cause toxic effects on the optic nerve, leading to atrophy and neuritis-like presentations. * **Methanol (Option C):** Methanol poisoning leads to the accumulation of formic acid, which has a predilection for the optic nerve. It causes severe optic disc edema followed by permanent optic atrophy ("snowstorm vision"). **High-Yield Clinical Pearls for NEET-PG:** 1. **ONTT Protocol:** High-dose IV Methylprednisolone (1g/day for 3 days) followed by oral Prednisone. Note: Oral steroids alone are contraindicated as they increase the rate of recurrence. 2. **Marcus Gunn Pupil:** A Relative Afferent Pupillary Defect (RAPD) is the hallmark clinical sign of unilateral optic neuritis. 3. **Pulfrich Phenomenon:** A clinical feature where objects moving in a straight line appear to move in elliptical orbits due to delayed conduction in the affected optic nerve. 4. **Uhthoff’s Phenomenon:** Transient worsening of vision following a rise in body temperature (e.g., after a hot bath or exercise), highly suggestive of Multiple Sclerosis.

Q: Where is a lesion that produces the visual field defect shown in the figure?

Right temporal lobe. ***Right temporal lobe*** - A lesion in the **right temporal lobe** affecting **Meyer's loop** (inferior optic radiation) causes **left superior homonymous quadrantanopia** ("pie in the sky" defect). - Meyer's loop carries visual fibers from the **inferior retinal quadrants**, so damage results in loss of the **superior visual field** on the contralateral side. *Right parietal lobe* - A **right parietal lobe** lesion affects the **superior optic radiation** and causes **left inferior homonymous quadrantanopia** ("pie on the floor"). - This would produce a **lower visual field defect**, not the superior field loss typically seen in temporal lobe lesions. *Right optic tract* - A **right optic tract** lesion would cause **complete left homonymous hemianopia**, affecting both superior and inferior quadrants. - This produces a much more extensive visual field defect than the **quadrantanopia** seen with temporal lobe lesions. *Right optic nerve* - A **right optic nerve** lesion causes **monocular blindness** or **central scotoma** affecting only the right eye. - This would not produce any **homonymous field defect** since it occurs before the **optic chiasm** where fibers decussate.

Q: Sudden painful loss of vision is seen in which of the following conditions?

Optic neuritis. The correct answer is **C. Optic neuritis**. ### **Medical Concept** Optic neuritis is an inflammatory condition of the optic nerve, most commonly associated with Multiple Sclerosis. The hallmark clinical triad includes **sudden vision loss**, **dyschromatopsia** (impaired color vision), and **periocular pain**. The pain is typically exacerbated by eye movements because the origins of the superior and medial recti muscles are closely attached to the dural sheath of the optic nerve at the orbital apex. ### **Analysis of Options** * **A. Papillitis:** While this is a form of optic neuritis (inflammation of the optic disc), the term "Optic Neuritis" is the broader, more definitive clinical diagnosis used in exams to describe the classic presentation of painful vision loss. However, in many clinical contexts, retrobulbar neuritis (normal disc appearance) is more frequently associated with pain than pure papillitis. * **B. Central Retinal Vein Occlusion (CRVO):** This presents as **sudden painless** loss of vision. The classic fundus finding is a "blood and thunder" appearance (tortuous veins and widespread hemorrhages). * **D. All of the above:** Incorrect, as CRVO is characteristically painless. ### **Clinical Pearls for NEET-PG** * **Marcus Gunn Pupil:** A Relative Afferent Pupillary Defect (RAPD) is the most important objective sign of optic neuritis. * **Pulfrich Phenomenon:** Objects moving in a straight line appear to move in an elliptical orbit (seen in recovering optic neuritis). * **Uhthoff’s Phenomenon:** Temporary worsening of vision when body temperature rises (e.g., after a hot bath or exercise). * **Treatment:** The **ONTT (Optic Neuritis Treatment Trial)** recommends IV Methylprednisolone followed by oral steroids. *Note: Oral steroids alone are contraindicated as they increase the rate of recurrence.*

Question 1

A middle-aged woman presents with visual difficulties. Her eye examination reveals that when a light is shined in her right eye, there is no pupillary response in either eye. However, upon shining a light in her left eye, both ipsilateral and contralateral pupillary responses are apparent. Her extraocular movements are intact. What is the MOST likely location of her lesion?

Accepted Answer

Optic nerve, right side

Answer

Oculomotor nerve, left side

Answer

Oculomotor nerve, right side

Answer

Optic nerve, left side

Question 2

In optic neuritis in children, which of the following symptoms is typically NOT present?

Accepted Answer

Headache and vomiting

Answer

Afferent pupillary defect

Answer

Pain on movement of the eyeball

Answer

Sudden vision loss

Question 3

Epiphora and lagophthalmos following VII nerve injury is due to?

Accepted Answer

Failure of the lacrimal pump

Answer

Increased lacrimal secretion

Answer

Nasolacrimal duct obstruction

Answer

None of the above

Question 4

Regarding acute papilloedema, which of the following is true?

Accepted Answer

Visual acuity is normal, but colour vision decreases.

Answer

Blind spot increases.

Answer

Colour vision is normal, but visual acuity decreases.

Answer

There is always associated optic nerve inflammation.

Question 5

Fundoscopy of a patient shows a chalky white optic disc with well-defined margins. The retinal vessels and surrounding retina appear normal. Which of the following is the most likely diagnosis?

Accepted Answer

Primary optic atrophy

Answer

Post-neuritic secondary optic atrophy

Answer

Glaucomatous optic atrophy

Answer

Consecutive optic atrophy

Question 6

Increased intracranial tension is associated with all of the following except?

Accepted Answer

Afferent pupillary defect

Answer

Disc edema

Answer

Macular edema

Answer

Normal vision

Question 7

Optic neuritis is caused by the following, except:

Accepted Answer

Steroid therapy

Answer

Ethambutol

Answer

Chloroquine

Answer

Methanol

Question 8

Consecutive optic atrophy is seen in which condition?

Accepted Answer

Retinitis pigmentosa

Answer

Papilloedema

Answer

Papillitis

Answer

Retinal detachment

Question 9

Where is a lesion that produces the visual field defect shown in the figure?

Accepted Answer

Right temporal lobe

Answer

Right parietal lobe

Answer

Right optic tract

Answer

Right optic nerve

Question 10

Sudden painful loss of vision is seen in which of the following conditions?

Accepted Answer

Optic neuritis

Answer

Papillitis

Answer

Central retinal vein obstruction

Answer

All of the above

Neuro-Ophthalmology — MCQs

Neuro-Ophthalmology — MCQs

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