Neuro-Ophthalmology Practice Questions

Q: Miners nystagmus is of which type?

Rotatory. **Explanation:** **Miner’s Nystagmus** is a classic occupational disorder historically seen in coal miners who worked in extremely low-light conditions for prolonged periods. **1. Why Rotatory is Correct:** The underlying pathophysiology is related to **prolonged dark adaptation**. In the dim light of mines, the foveal (cone) vision is inactive, and the miner relies on peripheral (rod) vision. This leads to a failure of the fixation reflex. The resulting nystagmus is typically **pendular, rapid, and rotatory** (torsional) in nature. It is often exacerbated by looking upwards or by physical exhaustion and is frequently associated with compensatory head tremors and blepharospasm. **2. Why the Other Options are Incorrect:** * **Lateral (Horizontal):** While some components of movement may appear horizontal, the hallmark of Miner’s nystagmus is its rotatory/torsional component. Pure lateral nystagmus is more characteristic of vestibular or cerebellar lesions. * **Vertical:** Vertical nystagmus (up-beat or down-beat) usually signifies brainstem or craniocervical junction pathology (e.g., Arnold-Chiari malformation) rather than occupational light deprivation. * **All of the above:** This is incorrect because the specific clinical description of Miner’s nystagmus is consistently rotatory and pendular. **Clinical Pearls for NEET-PG:** * **Etiology:** It is considered a form of "disuse atrophy" of the fixation reflex due to chronic darkness. * **Current Status:** It is now largely a **historical condition** due to improved lighting (electric lamps) in modern mines. * **Key Triad:** Nystagmus (rotatory), Vertigo, and Head tremors. * **Differential:** Do not confuse this with *Spasmus Nutans*, which also presents with pendular nystagmus and head nodding but occurs in infants.

Q: Fundoscopic features of papilledema include all the following except?

Deep physiological cup. **Explanation:** **Papilledema** refers specifically to optic disc swelling secondary to increased intracranial pressure (ICP). The fundamental pathophysiology involves the transmission of high CSF pressure through the subarachnoid space surrounding the optic nerve, which causes stasis of axoplasmic flow and vascular congestion. **Why "Deep physiological cup" is the correct answer:** In papilledema, the swelling of the optic nerve fibers and the accumulation of extracellular fluid cause the optic disc to protrude anteriorly into the vitreous. This process **obliterates (fills in)** the physiological cup. A "deep physiological cup" is actually a characteristic feature of **Glaucoma** (cupping), making it the opposite of what is seen in papilledema. **Analysis of incorrect options:** * **A. Ill-defined disc margin:** This is the earliest sign of papilledema. Edema starts at the nasal margin and spreads circumferentially, blurring the edges. * **C. Absent venous pulsation:** Spontaneous Venous Pulsation (SVP) is lost when ICP exceeds 200 mmH₂O. While 20% of the normal population lacks SVP, its *disappearance* in a patient who previously had it is a sensitive indicator of rising ICP. * **D. Bending of blood vessels:** As the disc becomes elevated (dome-shaped), the retinal vessels must climb over the swollen edges, causing them to "bend" or "curve" sharply at the disc margin. **High-Yield Clinical Pearls for NEET-PG:** * **Paton’s Lines:** Circumferential retinal folds seen on the temporal side of the swollen disc. * **Foster Kennedy Syndrome:** Anosmia, ipsilateral optic atrophy (due to direct tumor compression), and contralateral papilledema (due to raised ICP). * **Early vs. Late:** In early papilledema, visual acuity is usually **preserved**, whereas in optic neuritis (inflammatory swelling), vision loss is sudden and severe. * **Modified Frisén Scale:** Used for clinical grading of papilledema severity.

Q: Anterior Ischemic Optic Neuropathy (AION) is seen in which of the following conditions?

Giant cell arteritis. **Explanation:** **Anterior Ischemic Optic Neuropathy (AION)** is caused by the occlusion of the **short posterior ciliary arteries**, which supply the optic nerve head. It is broadly classified into two types: Arteritic (A-AION) and Non-Arteritic (NA-AION). 1. **Why Giant Cell Arteritis (GCA) is correct:** GCA is the primary cause of **Arteritic AION**. It is a systemic granulomatous vasculitis affecting medium and large-sized arteries. In the eye, it leads to rapid, profound vision loss due to inflammatory occlusion of the ciliary circulation. It is a medical emergency requiring high-dose systemic steroids to prevent bilateral blindness. 2. **Why the other options are incorrect:** * **Chronic Simple Glaucoma:** This is a progressive optic neuropathy characterized by increased intraocular pressure and "cupping" of the disc, not acute ischemic infarction. * **Chronic Iridocyclitis:** This is a form of anterior uveitis. While it can cause secondary complications like cataracts or macular edema, it does not typically manifest as AION. * **Sarcoidosis:** While sarcoidosis can cause optic neuropathy (usually via granulomatous infiltration or optic neuritis), it is not a classic cause of AION. **High-Yield Clinical Pearls for NEET-PG:** * **Clinical Presentation:** Sudden, painless, unilateral vision loss with an **Afferent Pupillary Defect (RAPD)** and "pale edema" of the optic disc. * **A-AION (GCA) Markers:** Elevated ESR (>50 mm/hr), elevated C-Reactive Protein (CRP), and thrombocytosis. * **Systemic Symptoms of GCA:** Jaw claudication (most specific), scalp tenderness, and headache. * **Gold Standard Diagnosis for GCA:** Temporal artery biopsy. * **NA-AION:** Associated with "crowded discs" (disc-at-risk), hypertension, and diabetes.

Q: All of the following drugs are used for the management of postherpetic neuralgia except?

Cycloplegics. **Explanation:** Postherpetic Neuralgia (PHN) is a chronic neuropathic pain syndrome persisting for more than 90 days after the onset of a Herpes Zoster rash. The management focuses on stabilizing overactive pain signaling in the peripheral and central nervous systems. **Why Cycloplegics are the Correct Answer:** Cycloplegics (e.g., Atropine, Homatropine) are used in the **acute phase** of Herpes Zoster Ophthalmicus (HZO) to treat associated anterior uveitis and ciliary spasm. They have no role in managing **Postherpetic Neuralgia**, which is a chronic neurological pain condition rather than an active inflammatory ocular condition. **Analysis of Incorrect Options:** * **Nortriptyline:** Tricyclic Antidepressants (TCAs) like Nortriptyline and Amitriptyline are first-line systemic agents for PHN. They work by inhibiting the reuptake of serotonin and norepinephrine, modulating pain pathways. * **Capsaicin Cream:** This is a topical alkaloid derived from chili peppers. It works by depleting **Substance P** from peripheral sensory neurons, thereby desensitizing the area to pain. * **Gabapentin:** An anticonvulsant that binds to the $\alpha_2\delta$ subunit of voltage-gated calcium channels. It is a mainstay of treatment for neuropathic pain. **High-Yield Clinical Pearls for NEET-PG:** * **Hutchinson’s Sign:** Vesicles on the tip of the nose (involvement of the nasociliary nerve) indicate a high risk of ocular involvement in HZO. * **First-line for PHN:** Gabapentin, Pregabalin, or TCAs (Nortriptyline is often preferred over Amitriptyline in elderly patients due to fewer anticholinergic side effects). * **Acute HZO Treatment:** Oral Acyclovir (800 mg 5 times daily for 7–10 days) started within 72 hours of rash onset reduces the risk of PHN.

Q: Which of the following conditions is characterized by thyroid ophthalmopathy?

Thyroid ophthalmopathy. **Explanation:** **Thyroid Ophthalmopathy** (also known as Graves’ Orbitopathy) is an autoimmune inflammatory disorder associated with thyroid dysfunction, most commonly hyperthyroidism (Graves' disease). The underlying mechanism involves the activation of orbital fibroblasts by thyroid-stimulating hormone receptor (TSHR) antibodies. This leads to the accumulation of glycosaminoglycans (hyaluronic acid), resulting in extraocular muscle enlargement and increased orbital fat volume. **Analysis of Options:** * **Myasthenia Gravis (A):** This is a neuromuscular junction disorder characterized by fatiguable ptosis and diplopia. While it can coexist with thyroid disease, it does not cause the orbital tissue expansion seen in thyroid ophthalmopathy. * **Marfan Syndrome (B):** This is a connective tissue disorder (Fibrillin-1 mutation). Ocular hallmarks include **Ectopia Lentis** (typically superotemporal subluxation) and high myopia, not orbital inflammation. * **Pancoast Tumor (D):** An apical lung tumor that typically causes **Horner’s Syndrome** (ptosis, miosis, anhidrosis) due to compression of the sympathetic chain. It does not involve thyroid-related orbital changes. **High-Yield Clinical Pearls for NEET-PG:** 1. **Most common cause of both unilateral and bilateral proptosis** in adults is Thyroid Eye Disease. 2. **Dalrymple Sign:** Pathognomonic lid retraction in the primary position. 3. **Von Graefe’s Sign:** Lid lag on downward gaze. 4. **Muscle Involvement Sequence (Mnemonic: I’M SLOW):** Inferior Rectus (most common) > Medial Rectus > Superior Rectus > Lateral Rectus. 5. **Smoking** is the most significant modifiable risk factor for the progression of the disease.

Q: Homonymous hemianopia with macular sparing is seen in:

Lesions of the visual cortex. **Explanation:** **1. Why Option A is Correct:** Homonymous hemianopia with macular sparing is the hallmark of a lesion in the **visual cortex (occipital lobe)**. The macula is spared due to two primary reasons: * **Dual Blood Supply:** The visual cortex receives blood from both the **Posterior Cerebral Artery (PCA)** and the **Middle Cerebral Artery (MCA)**. In a PCA stroke (the most common cause of cortical blindness), the MCA continues to supply the occipital pole where the macula is represented. * **Large Cortical Representation:** The macula occupies a disproportionately large area of the visual cortex (macular magnification), making it more resilient to small focal lesions. **2. Why Other Options are Incorrect:** * **Optic Radiations (Option B):** Lesions here typically cause a complete homonymous hemianopia **without** macular sparing. Depending on the fiber bundle involved, they may also cause quadrantanopias (e.g., "Pie in the sky" for temporal lobe/Meyer’s loop or "Pie on the floor" for parietal lobe/Baum’s loop). * **Lateral Geniculate Body (Option C):** Lesions here are rare and usually result in incongruous homonymous hemianopia or specific sectoral defects (like horizontal sectoranopia) depending on the blood supply involved (Anterior vs. Posterior Choroidal arteries). **3. NEET-PG High-Yield Pearls:** * **Congruity:** The more posterior the lesion (closer to the cortex), the more **congruous** (identical in both eyes) the visual field defect. * **Macular Sparing vs. Macular Splitting:** Macular **sparing** points to the Occipital Cortex; Macular **splitting** (the vertical line goes straight through the macula) points to the Optic Tract. * **Most common cause:** PCA occlusion is the most frequent cause of homonymous hemianopia with macular sparing.

Question 1

Miners nystagmus is of which type?

Accepted Answer

Rotatory

Answer

Lateral

Answer

Vertical

Answer

All of the above

Question 2

Fundoscopic features of papilledema include all the following except?

Accepted Answer

Deep physiological cup

Answer

Ill-defined disc margin

Answer

Absent venous pulsation

Answer

Bending of blood vessels

Question 3

Loss of convergence with slight light reflex is seen in which condition?

Accepted Answer

Holmes Adie's pupil

Answer

Argyll Robertson pupil

Answer

Marcus Gunn pupil

Answer

Wernicke's pupil

Question 4

Anterior Ischemic Optic Neuropathy (AION) is seen in which of the following conditions?

Accepted Answer

Giant cell arteritis

Answer

Chronic simple glaucoma

Answer

Chronic iridocyclitis

Answer

Sarcoidosis

Question 5

All of the following drugs are used for the management of postherpetic neuralgia except?

Accepted Answer

Cycloplegics

Answer

Nortriptyline

Answer

Capsaicin cream

Answer

Gabapentin

Question 6

Which of the following conditions is characterized by thyroid ophthalmopathy?

Accepted Answer

Thyroid ophthalmopathy

Answer

Myasthenia Gravis

Answer

Marfan syndrome

Answer

Pancoast tumor

Question 7

Which of the following is FALSE regarding optic atrophy?

Accepted Answer

Pallor of the disc is due to the degeneration of nerve fibres.

Answer

The disc is chalky white in primary optic atrophy.

Answer

Pallor of the disc cannot be correlated with the amount of visual loss.

Answer

All of the above are false.

Question 8

Aberrant regeneration does not occur after injury to the oculomotor nerve with which one of the following conditions?

Accepted Answer

Ischemia secondary to diabetes

Answer

Trauma

Answer

Tumor compression

Answer

Aneurysm

Question 9

Homonymous hemianopia with macular sparing is seen in:

Accepted Answer

Lesions of the visual cortex

Answer

Lesions of the optic radiations

Answer

Lesions of the lateral geniculate body

Answer

All the above

Question 10

Homonymous hemianopia is seen in a lesion of which of the following?

Accepted Answer

Optic tract, optic radiation, and occipital cortex

Answer

Optic chiasm, optic nerve, and optic radiation

Answer

Optic radiation, occipital cortex, and optic nerve

Answer

Optic nerve, optic tract, and occipital cortex

Neuro-Ophthalmology — MCQs

Neuro-Ophthalmology — MCQs

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