Neuro-Ophthalmology Practice Questions

Q: A lesion in which of the following locations on the right side would result in left homonymous hemianopia?

Optic tract. ### Explanation **1. Why Optic Tract is Correct:** The visual pathway is organized such that fibers from the **nasal retina** (which see the temporal visual field) decussate at the optic chiasma, while fibers from the **temporal retina** (which see the nasal visual field) remain ipsilateral. A lesion of the **Right Optic Tract** interrupts: * Fibers from the **right temporal retina** (responsible for the left nasal field). * Fibers from the **left nasal retina** (responsible for the left temporal field). The result is a loss of the entire left half of the visual field in both eyes, known as **Left Homonymous Hemianopia**. **2. Analysis of Incorrect Options:** * **Optic Nerve:** A lesion here results in **ipsilateral monocular blindness** (total vision loss in one eye) because it occurs before any fibers decussate. * **Optic Chiasma:** A midline lesion (e.g., Pituitary Adenoma) affects the decussating nasal fibers from both eyes, leading to **Bitemporal Hemianopia**. * **Occipital Cortex:** While a right-sided lesion here *can* cause left homonymous hemianopia, it is typically characterized by **Macular Sparing** due to the dual blood supply (Middle and Posterior Cerebral Arteries) to the visual cortex. Since "Optic Tract" is a classic site for complete homonymous hemianopia, it is the preferred answer in this context. **3. NEET-PG High-Yield Pearls:** * **Rule of Congruity:** The more posterior the lesion (closer to the occipital lobe), the more **congruous** (identical in shape) the field defects become. Optic tract lesions are usually **incongruous**. * **Wernicke’s Hemianopic Pupil:** Seen in optic tract lesions; light shined on the blind half of the retina produces no pupillary response. * **Meyer’s Loop (Temporal lobe):** Lesion causes "Pie in the sky" (Superior Quadrantanopia). * **Baum’s Loop (Parietal lobe):** Lesion causes "Pie on the floor" (Inferior Quadrantanopia).

Q: Which of the following is NOT typically seen in a third nerve palsy?

Miosis. In **Third Nerve (Oculomotor) Palsy**, the clinical presentation is dictated by the loss of innervation to the extraocular muscles (except the Lateral Rectus and Superior Oblique) and the levator palpebrae superioris, along with the loss of parasympathetic supply to the eye. ### Why Miosis is the Correct Answer **Miosis (pupillary constriction)** is NOT seen in third nerve palsy. The oculomotor nerve carries **parasympathetic fibers** that originate from the Edinger-Westphal nucleus and are responsible for pupillary constriction (sphincter pupillae) and accommodation. Damage to these fibers results in **Mydriasis (a dilated pupil)** and a loss of the light reflex, rather than miosis. ### Explanation of Other Options * **Ptosis (A):** Occurs due to paralysis of the **Levator Palpebrae Superioris** muscle. It is typically a complete, "curtain-like" ptosis. * **Diplopia (B):** Results from the misalignment of the visual axes (strabismus) because the extraocular muscles are no longer balanced. * **Outward deviation (D):** Since the Medial, Superior, and Inferior Recti are paralyzed, the **Lateral Rectus (CN VI)** and **Superior Oblique (CN IV)** act unopposed. This results in the classic **"Down and Out"** position of the eye. ### NEET-PG High-Yield Pearls 1. **Pupil-Sparing vs. Pupil-Involving:** * **Pupil-Sparing:** Often seen in **Medical causes** (e.g., Diabetes, Hypertension) due to microvascular ischemia affecting the central core of the nerve. * **Pupil-Involving:** Often seen in **Surgical causes** (e.g., P-Comm Artery Aneurysm) because parasympathetic fibers are located superficially (peripherally) on the nerve and are compressed first. 2. **The "Rule of Pupil":** A painful third nerve palsy with pupil involvement is a neurosurgical emergency (rule out aneurysm). 3. **Pseudo-Graefe Sign:** Aberrant regeneration of the third nerve where the lid elevates on downgaze.

Q: Typical field defect observed in anterior ischemic optic neuropathy is?

Altitudinal hemianopia. **Explanation:** **Anterior Ischemic Optic Neuropathy (AION)** occurs due to occlusion of the **short posterior ciliary arteries**, which supply the optic nerve head. The vascular supply of the optic disc is divided into superior and inferior halves. Because of this segmental distribution, ischemia typically affects one half of the disc, leading to the characteristic **Altitudinal Hemianopia** (a defect that respects the horizontal midline). Inferior altitudinal defects are more common than superior ones. **Analysis of Incorrect Options:** * **A. Homonymous hemianopia:** This occurs in lesions **posterior to the optic chiasm** (optic tract, lateral geniculate body, or optic radiations). It respects the vertical midline, not the horizontal. * **B. Baring of the blind spot:** This is a non-specific sign formerly associated with **early glaucoma**, where the physiological blind spot appears excluded from the central field. * **C. Paracentral scotoma:** These are small islands of vision loss near the point of fixation, commonly seen in **early glaucoma** or certain maculopathies. **High-Yield Clinical Pearls for NEET-PG:** * **Types of AION:** 1. **Non-Arteritic (NA-AION):** Most common; associated with hypertension, diabetes, and a "disc-at-risk" (small cup-to-disc ratio). 2. **Arteritic (A-AION):** Associated with **Giant Cell Arteritis (GCA)**. It is a medical emergency requiring high-dose steroids to prevent bilateral blindness. * **Classic Presentation:** Sudden, painless monocular vision loss with an **Afferent Pupillary Defect (RAPD)** and a swollen, pale optic disc ("chalky white" in arteritic cases). * **Key Distinction:** While AION causes altitudinal defects, **Optic Neuritis** typically presents with a **central or centrocecal scotoma**.

Q: Which of the following is NOT a characteristic of diabetic third nerve palsy?

Aberrant regeneration. In diabetic third nerve palsy, the underlying pathology is **microvascular ischemia** (vasa nervorum infarction). This leads to axonal damage but leaves the surrounding connective tissue sheath intact. **Why "Aberrant Regeneration" is the correct answer:** Aberrant regeneration (synkinesis) occurs when regenerating nerve fibers are misdirected into the wrong muscle sheaths (e.g., fibers meant for the superior rectus reaching the levator palpebrae). This phenomenon is **only seen in compressive or traumatic lesions** where the nerve sheath is disrupted. In diabetic (ischemic) palsy, the endoneurial sheath remains intact, acting as a guide for correct regrowth; therefore, aberrant regeneration does **not** occur. **Explanation of other options:** * **Presence of pain (A):** Contrary to popular belief, about 50-80% of diabetic 3rd nerve palsies are associated with periorbital pain, likely due to irritation of trigeminal pain fibers within the cavernous sinus. * **Normal pupillary function (B):** This is the hallmark of "Medical 3rd nerve palsy." Parasympathetic pupilloconstrictor fibers are located peripherally on the nerve. In ischemia, the central core is affected, sparing the superficial pupillary fibers. (In contrast, surgical compression by an Aneurysm usually involves the pupil). * **Spontaneous recovery (C):** Most ischemic palsies resolve completely within 3 to 6 months as the nerve remyelinates. **High-Yield Clinical Pearls for NEET-PG:** * **Rule of the Pupil:** If the pupil is spared, think Medical (Diabetes/HTN). If the pupil is involved (dilated/fixed), think Surgical (Post. Communicating Artery Aneurysm). * **Most common cause** of isolated 3rd nerve palsy in adults is Diabetes Mellitus. * **Nerve involved:** The oculomotor nerve (CN III) is most commonly affected in diabetic mononeuropathy.

Q: Incongruous homonymous hemianopia is caused by a lesion in which of the following?

Optic tract. **Explanation:** The key to solving visual field defects lies in understanding the anatomical symmetry of the visual pathways. **1. Why Optic Tract is Correct:** A **homonymous hemianopia** occurs when there is a lesion posterior to the optic chiasm. The term **"incongruous"** refers to a visual field defect that is significantly different in shape, size, or intensity between the two eyes. * In the **optic tract**, the nerve fibers from the two eyes (ipsilateral temporal and contralateral nasal) are not yet closely "aligned" or packed together according to their corresponding retinal points. * Therefore, a lesion here affects these fibers unequally, resulting in a highly **incongruous** defect. As we move more posteriorly toward the occipital cortex, the fibers become more tightly organized, and the defects become increasingly **congruous** (symmetrical). **2. Why Other Options are Incorrect:** * **Optic Chiasma:** Lesions here typically cause **bitemporal hemianopia** (heteronymous) because they affect the decussating nasal fibers. * **Optic Nerve:** Lesions here result in **ipsilateral monocular vision loss** or a central scotoma, not a hemianopia. * **Optic Radiation:** Lesions in the radiations (or the occipital cortex) produce **congruous** homonymous hemianopia because the fibers from corresponding retinal points are anatomically closer together. **High-Yield Clinical Pearls for NEET-PG:** * **Wernicke’s Hemianopic Pupil:** Seen in optic tract lesions. Light shined on the non-functioning half of the retina produces no pupillary response. * **Bow-tie Atrophy:** Optic tract lesions lead to primary optic atrophy; specifically, "bow-tie" atrophy in the contralateral eye. * **Rule of Thumb:** The more posterior the lesion (e.g., Occipital Lobe), the more **congruous** the defect. Occipital lesions are also associated with **macular sparing**.

Q: Which of the following statements about Leber's hereditary optic neuropathy is FALSE?

It is an X-linked recessive trait.. **Explanation:** Leber’s Hereditary Optic Neuropathy (LHON) is a classic example of **Mitochondrial Inheritance** (maternal inheritance), not X-linked recessive inheritance. This is why Option B is the false statement. In mitochondrial disorders, the mutation is located in the mitochondrial DNA (mtDNA); therefore, it is transmitted only by females to all their children, but affected males cannot pass the trait to their offspring. **Analysis of other options:** * **Option A (Male predominance):** Despite being maternally inherited, LHON shows a striking male predilection (approx. 80-90% of clinically affected individuals are male). The exact reason is unclear but may involve hormonal factors or a nuclear modifier gene. * **Option C (Profound vision loss):** LHON typically presents as a painless, subacute, bilateral (sequential) central vision loss leading to dense central or centrocecal scotomas and optic atrophy. * **Option D (Cardiac preexcitation):** LHON is occasionally associated with minor neurological abnormalities and cardiac conduction defects, specifically **Wolff-Parkinson-White (WPW)** and Lown-Ganong-Levine syndromes. **High-Yield Clinical Pearls for NEET-PG:** * **Triad of Acute LHON:** Circumpapillary telangiectatic microangiopathy, swelling of the nerve fiber layer (pseudo-edema), and absence of leakage on Fluorescein Angiography (FFA). * **Common Mutations:** 11778 (most common, worst prognosis), 3460, and 14484 (best prognosis for recovery). * **Risk Factors:** Smoking and alcohol consumption can trigger or worsen vision loss in carriers.

Q: Bergmeister papilla are present on which anatomical structure?

Near the optic disc. **Explanation:** **Bergmeister’s papilla** is a benign congenital remnant of the **hyaloid artery** system. During fetal development, the hyaloid artery provides nourishment to the developing lens. It is enclosed in a sheath of glial tissue called the fibrous sheath of the hyaloid artery. Normally, this system regresses completely by the seventh month of gestation. When the posterior portion of this glial sheath fails to regress fully, it persists as a small tuft of fibrous or glial tissue arising from the center of the **optic disc**. **Analysis of Options:** * **Option B (Correct):** Bergmeister’s papilla is specifically located at the optic disc (nerve head). It often appears as a small, white, elevated tuft of tissue, usually on the nasal side of the disc, and typically does not affect vision. * **Option A:** The anterior corneal surface is not involved in the hyaloid system. * **Option C & D:** While the hyaloid artery extends from the disc to the lens, a remnant on the **posterior lens surface** is known as a **Mittendorf dot**, not Bergmeister’s papilla. The anterior lens surface is unrelated to this vascular regression. **High-Yield Clinical Pearls for NEET-PG:** * **Mittendorf Dot:** A small, circular opacity on the posterior lens capsule (nasal to the center) representing the anterior attachment of the hyaloid artery. * **Persistent Fetal Vasculature (PFV):** A condition where the primary vitreous fails to regress, potentially leading to leukocoria, microphthalmos, and tractional retinal detachment. * **Cloquet’s Canal:** The empty space/channel in the vitreous where the hyaloid artery once resided.

Q: Foster Kennedy syndrome is associated with all of the following, except:

Contralateral Optic Atrophy. ### Explanation **Foster Kennedy Syndrome** is a classic neuro-ophthalmological triad caused by a space-occupying lesion (SOL), most commonly an **Olfactory groove meningioma**, frontal lobe tumor, or sphenoid wing meningioma. #### Why "Contralateral Optic Atrophy" is the Correct Answer: In Foster Kennedy Syndrome, the optic atrophy occurs **ipsilateral** (on the same side) to the lesion, not contralateral. The tumor exerts direct mechanical pressure on the optic nerve, leading to compressive atrophy. Therefore, "Contralateral Optic Atrophy" is the false statement. #### Analysis of Other Options: * **A. Ipsilateral Anosmia:** The tumor (e.g., olfactory groove meningioma) compresses the olfactory bulb/tract on the same side, leading to a loss of smell. * **C. Olfactory groove meningioma:** This is the most common cause of this syndrome. * **D. Contralateral Papilloedema:** As the tumor grows, it increases intracranial pressure (ICP). Since the ipsilateral optic nerve is already atrophied (dead fibers cannot swell), the increased ICP manifests as papilledema only in the healthy **contralateral** eye. #### Clinical Pearls for NEET-PG: 1. **The Triad:** 1) Ipsilateral optic atrophy, 2) Contralateral papilledema, 3) Ipsilateral anosmia. 2. **Pseudo-Foster Kennedy Syndrome:** This presents with similar fundus findings (atrophy in one eye, edema in the other) but is caused by sequential **Non-Arteritic Ischemic Optic Neuropathy (NAION)**, not a tumor. It lacks anosmia and features of raised ICP. 3. **Key Localization:** Frontal lobe/Anterior cranial fossa. 4. **Memory Aid:** The side with the **T**umor has the **T**otal loss of vision (Atrophy) and **T**otal loss of smell (Anosmia).

Q: The shown procedure is helpful in diagnosing which condition?

Marcus Gunn pupil. ***Marcus Gunn pupil*** - The **swinging flashlight test** detects **relative afferent pupillary defect (RAPD)** by alternating light between eyes to identify asymmetric pupillary responses. - Marcus Gunn pupil shows **paradoxical dilation** when light swings to the affected eye due to **optic nerve dysfunction**. *Adie's pupil* - Characterized by a **dilated pupil** with **slow constriction** to light and **better response to accommodation** than light. - The swinging flashlight test does not assess **accommodation reflexes** or detect the **tonic pupillary responses** typical of Adie's pupil. *Horner's pupil* - Features **miosis**, **ptosis**, and **anhidrosis** due to **sympathetic nerve pathway disruption**. - The swinging flashlight test evaluates **parasympathetic pathways** and **optic nerve function**, not sympathetic denervation. *Pinpoint pupil* - Results from **opioid intoxication** or **pontine lesions** causing **bilateral miosis** with preserved light reflexes. - The swinging flashlight test cannot differentiate **bilateral symmetric** pupillary abnormalities or assess **drug-induced miosis**.

Q: Disc edema is not seen in which of the following conditions?

Retrobulbar neuritis. **Explanation:** The presence or absence of disc edema in optic neuritis depends entirely on the **location** of the inflammation relative to the optic nerve head. **1. Why Retrobulbar Neuritis is the correct answer:** In retrobulbar neuritis, the inflammation occurs in the posterior part of the optic nerve, well behind the eyeball (the lamina cribrosa). Because the inflammation is distant from the optic disc, the fundus appears **completely normal** during the acute phase. This leads to the classic clinical adage: *"The patient sees nothing (due to vision loss), and the doctor sees nothing (due to a normal fundus)."* **2. Why the other options are incorrect:** * **Papillitis:** This is a form of optic neuritis where the inflammation involves the optic disc itself. Therefore, hyperaemia and edema of the disc are primary clinical findings. * **Papilledema:** By definition, this is passive bilateral disc edema resulting from increased intracranial pressure (ICP). * **Optic Nerve Glioma:** This tumor can cause disc edema either by direct compression/infiltration of the nerve head or by obstructing venous drainage (pre-septal location). **Clinical Pearls for NEET-PG:** * **Retrobulbar Neuritis** is most commonly associated with **Multiple Sclerosis (MS)** in adults. * **Marcus Gunn Pupil (RAPD)** is the most important objective sign in all forms of optic neuritis, including retrobulbar neuritis, even when the disc looks normal. * **Visual Field Defect:** The most common defect in optic neuritis is a **central or centrocecal scotoma**. * **Pulfrich Phenomenon:** A classic high-yield symptom where objects moving in a straight line appear to move in an elliptical orbit due to delayed conduction in the affected nerve.

Question 1

A lesion in which of the following locations on the right side would result in left homonymous hemianopia?

Accepted Answer

Optic tract

Answer

Optic nerve

Answer

Optic chiasma

Answer

Occipital cortex

Question 2

Which of the following is NOT typically seen in a third nerve palsy?

Accepted Answer

Miosis

Answer

Ptosis

Answer

Diplopia

Answer

Outward deviation of the eye

Question 3

Typical field defect observed in anterior ischemic optic neuropathy is?

Accepted Answer

Altitudinal hemianopia

Answer

Homonymous hemianopia

Answer

Baring of the blind spot

Answer

Paracentral scotoma

Question 4

Which of the following is NOT a characteristic of diabetic third nerve palsy?

Accepted Answer

Aberrant regeneration

Answer

Presence of pain

Answer

Normal pupillary function

Answer

Spontaneous recovery within 6 months

Question 5

Incongruous homonymous hemianopia is caused by a lesion in which of the following?

Accepted Answer

Optic tract

Answer

Optic chiasma

Answer

Optic nerve

Answer

Optic radiation

Question 6

Which of the following statements about Leber's hereditary optic neuropathy is FALSE?

Accepted Answer

It is an X-linked recessive trait.

Answer

It shows male predominance.

Answer

It causes profound vision loss.

Answer

It is associated with cardiac preexcitation syndrome.

Question 7

Bergmeister papilla are present on which anatomical structure?

Accepted Answer

Near the optic disc

Answer

Anterior corneal surface

Answer

Anterior lens surface

Answer

Posterior lens surface

Question 8

Foster Kennedy syndrome is associated with all of the following, except:

Accepted Answer

Contralateral Optic Atrophy

Answer

Ipsilateral Anosmia

Answer

Olfactory groove meningioma

Answer

Contralateral Papilloedema

Question 9

The shown procedure is helpful in diagnosing which condition?

Accepted Answer

Marcus Gunn pupil

Answer

Adie's pupil

Answer

Horner's pupil

Answer

Pinpoint pupil

Question 10

Disc edema is not seen in which of the following conditions?

Accepted Answer

Retrobulbar neuritis

Answer

Papillitis

Answer

Papilledema

Answer

Optic nerve glioma

Neuro-Ophthalmology — MCQs

Neuro-Ophthalmology — MCQs

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