Neuro-Ophthalmology Practice Questions

Q: Which test is used to detect a relative afferent pupillary defect (RAPD)?

Swinging flashlight test. ***Swinging flashlight test*** - The **swinging flashlight test** is the classic and most reliable method to detect a **relative afferent pupillary defect (RAPD)**. - It involves alternately shining a light into each eye, observing for unequal pupillary constriction and dilation, which indicates a defect in the afferent visual pathway of the affected eye. *Tonometry* - **Tonometry** is used to measure **intraocular pressure**, which is important for detecting and monitoring conditions like glaucoma. - It does not assess pupillary function or the integrity of the afferent visual pathway. *Slit-lamp examination* - A **slit-lamp examination** provides a magnified view of the anterior and posterior segments of the eye, helping to identify various ocular diseases like cataracts or uveitis. - While it can reveal structural abnormalities, it is not designed to detect an RAPD. *Perimetry* - **Perimetry**, also known as visual field testing, assesses the extent of a person's **field of vision** and can detect visual field defects. - It is used to evaluate the function of the retina and optic nerve but does not directly measure pupillary responses or an RAPD.

Q: All of the following are seen in 3rd nerve palsy except

Loss of abduction. ***Loss of abduction*** - The **lateral rectus muscle**, responsible for **abduction** of the eye, is innervated by the **abducens nerve (CN VI)**, not the oculomotor nerve (CN III). - Therefore, a third nerve palsy would not directly cause a loss of abduction. *Ptosis* - **Ptosis** (drooping of the upper eyelid) is a common finding in **CN III palsy** due to paralysis of the **levator palpebrae superioris muscle**. - This muscle is innervated by the oculomotor nerve. *Pupillary dilatation* - The **oculomotor nerve (CN III)** carries **parasympathetic fibers** that constrict the pupil. - Damage to these fibers in a CN III palsy results in **unopposed sympathetic activity**, leading to a dilated pupil that is poorly reactive to light. *Exotropia and hypotropia* - **Exotropia** (eye turned outward) occurs due to unopposed action of the **lateral rectus muscle**. - **Hypotropia** (eye turned downward) is due to the unopposed action of the **superior oblique muscle**.

Q: A 50-year-old woman presents with progressive visual loss in her right eye and pain with eye movements. An MRI shows optic nerve enhancement. Which condition is most likely?

Optic neuritis. ***Optic neuritis*** - **Progressive visual loss** and **pain with eye movements** are classic symptoms of optic neuritis, an inflammatory demyelinating condition of the optic nerve. - **Optic nerve enhancement** on MRI confirms inflammation of the optic nerve, highly characteristic of optic neuritis. *Retinal detachment* - Symptoms typically include a **sudden onset of flashes, floaters**, and a **"curtain" or "shadow"** in the visual field, not usually pain with eye movement. - Diagnosis is made by **ophthalmoscopy** showing the detached retina, not optic nerve enhancement on MRI. *Acute angle-closure glaucoma* - Presents with **sudden severe eye pain, headache, blurred vision, halos** around lights, and a **red eye** with a fixed, dilated pupil. - The elevated **intraocular pressure** is the key feature, and it does not typically show optic nerve enhancement on MRI. *Central retinal artery occlusion* - Characterized by **sudden, painless, severe vision loss** in one eye, often described as a "stroke of the eye." - Ophthalmoscopy reveals a **"cherry-red spot"** on the fovea with retinal whitening, and there is no associated pain with eye movement or optic nerve enhancement.

Q: A patient presents with vertical diplopia and a head tilt. What is the most likely cause?

Superior oblique palsy. ***Superior oblique palsy*** - A **superior oblique muscle palsy** characteristically causes **vertical diplopia** and a compensatory **head tilt away** from the affected eye to align the visual axes. - The superior oblique muscle is innervated by the **trochlear nerve (CN IV)**, and its primary actions are **intorsion**, depression, and abduction of the eye. - This is diagnosed using the **Parks-Bielschowsky three-step test**: vertical deviation increases on contralateral gaze and ipsilateral head tilt. *Medial rectus palsy* - A **medial rectus palsy** primarily causes **horizontal diplopia**, as it impairs the eye's ability to adduct (move inward). - This condition is typically associated with a **third cranial nerve (oculomotor nerve) lesion** and would not cause vertical diplopia or head tilt. *Lateral rectus palsy* - A **lateral rectus palsy** results in **horizontal diplopia**, as it prevents the eye from abducting (moving outward). - This is caused by a **sixth cranial nerve (abducens nerve) lesion** and would not present with vertical diplopia or head tilt. *Inferior rectus palsy* - An **inferior rectus palsy** would primarily affect the **depression** and **extorsion** of the eye, causing vertical diplopia. - However, the pattern differs from superior oblique palsy: it does not typically produce the same characteristic compensatory head tilt pattern. - This condition is also associated with a **third cranial nerve (oculomotor nerve) lesion**.

Q: Which of the following visual defects is most commonly associated with papilloedema?

Enlarged blind spot. ***Enlarged blind spot*** - Papilloedema is **swelling of the optic disc** due to increased intracranial pressure, which causes compression of the optic nerve fibers. - This compression primarily affects the axons originating from the **optic nerve head**, leading to an expansion of the physiological blind spot on visual field testing. *Homonymous hemianopia* - This visual field defect involves loss of vision in the **same half of the visual field** in both eyes, and is typically caused by lesions **posterior to the optic chiasm**. - It is not directly caused by papilloedema, which affects the optic nerve head itself. *Amaurosis fugax* - This refers to a **transient, monocular loss of vision** that often lasts for a few minutes, usually due to **retinal ischemia** (e.g., from an embolus). - While it represents a visual disturbance, it is distinct from the chronic, pressure-induced changes seen in papilloedema. *Homonymous quadrantanopia* - This is a loss of vision in **one quadrant of the visual field** in both eyes, also typically resulting from lesions in the **retrochiasmal visual pathways** (e.g., parietal or temporal lobe). - Like homonymous hemianopia, it is a cortical or subcortical lesion and not a direct consequence of optic disc swelling.

Q: Painful eye movement is a feature of :

Iridocyclitis. ***Iridocyclitis*** - **Inflammation of the iris and ciliary body** causes pain during eye movement due to irritation of the surrounding sensitive structures and muscle spasms. - The ciliary body contains muscles that control lens accommodation, and their inflammation makes eye movements particularly painful. *Papilledema* - This condition involves **swelling of the optic disc** due to increased intracranial pressure. - It usually presents with visual disturbances and headaches but **typically does not cause pain with eye movement**. *Corneal ulcer* - A **corneal ulcer** is an open sore on the cornea, causing severe eye pain, foreign body sensation, and photophobia. - While painful, the pain is primarily localized to the anterior surface of the eye and **does not typically worsen significantly with eye movement**. *Vernal catarrh* - This is a form of severe **allergic conjunctivitis**, causing intense itching, tearing, and mucous discharge. - Although it causes discomfort, a distinct feature of **painful eye movement is not characteristic** of vernal catarrh.

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

It is an example of gradual painless visual loss. ***Correct Answer: It is an example of gradual painless visual loss*** - Leber Hereditary Optic Neuropathy (LHON) typically presents with **acute or subacute painless central vision loss**, NOT gradual loss. - The vision loss occurs **rapidly over days to weeks**, usually affecting one eye first, followed by the other eye within weeks to months. - This makes Option A the correct answer to this "NOT" question, as gradual onset is NOT characteristic of LHON. *Incorrect Option: No leak of dye is observed in fluorescein angiography* - This is a **true clinical feature** of LHON and therefore not the correct answer to this "NOT" question. - **Fluorescein angiography** in LHON typically shows **no leakage**, which helps differentiate it from inflammatory or ischemic optic neuropathies. - The absence of leakage reflects that the primary pathology is mitochondrial dysfunction affecting retinal ganglion cells, not vascular inflammation or blood-retinal barrier breakdown. *Incorrect Option: Seen in the 2nd or 3rd decade of life* - This is a **true clinical feature** of LHON and therefore not the correct answer. - LHON most commonly manifests in **young adulthood**, with peak onset between **15-35 years** (2nd to 3rd decade). - Males are affected more frequently than females (approximately 80-90% of cases). *Incorrect Option: It is inherited through mitochondrial DNA* - This is a **true clinical feature** of LHON and therefore not the correct answer. - LHON is caused by mutations in **mitochondrial DNA (mtDNA)**, most commonly at positions 11778, 3460, and 14484. - Shows **maternal inheritance** - passed from mother to all children, but only daughters transmit to subsequent generations.

Q: Which is the most common ocular finding in myasthenia gravis?

Ptosis. ***Ptosis*** - **Ptosis**, or drooping of the eyelid, is the most common ocular manifestation of **myasthenia gravis**, affecting a large majority of patients. - It results from **weakness of the levator palpebrae superioris muscle**, which is responsible for lifting the eyelid. *Lagophthalmos* - **Lagophthalmos** is the inability to close the eyelids completely, often due to facial nerve palsy or severe proptosis. - While it can lead to exposure keratopathy, it is **not a primary or common finding** in myasthenia gravis. *Proptosis* - **Proptosis** (or exophthalmos) is the forward bulging of the eyeball, most commonly associated with **Graves' ophthalmopathy**. - It is **not a feature of myasthenia gravis**, which typically involves muscle weakness, not orbital mass effects. *Enophthalmos* - **Enophthalmos** refers to the posterior displacement of the eyeball within the orbit, often seen in conditions like **orbital fractures** or Horner's syndrome. - It is **not associated with the neuromuscular dysfunction** characteristic of myasthenia gravis.

Q: Incongruous Homonymous hemianopia with Wernicke's hemianopia pupil is seen with the lesion of

Optic tract lesion. ***Optic tract lesion*** - An **optic tract lesion** typically causes **incongruous homonymous hemianopia** because the fibers are not fully segregated by their retinal origin, leading to unequal visual field defects in the two eyes [1]. - The **Wernicke's hemianopic pupil** is a specific sign associated with optic tract lesions involving the afferent pupillary fibers, where direct light reflex is lost in the hemianopic half of the pupil, but consensual reflex is preserved [1]. *Optic radiation lesion* - An optic radiation lesion generally causes **congruous homonymous hemianopia**, as the fibers are more organized by retinal correspondence further along the visual pathway. - It does not typically present with a Wernicke's hemianopic pupil, as the pupillary fibers usually exit the visual pathway before reaching the optic radiations [1]. *Lateral geniculate body lesion* - A lesion of the lateral geniculate body (LGB) would result in a **congruous homonymous hemianopia**, similar to optic radiation lesions, because the fibers are already well-segregated and organized. - The LGB is primarily a relay station for visual information, and a lesion here would not typically affect the pupillary light reflex in the specific way seen in Wernicke's hemianopic pupil [1]. *Anterior occipital cortex lesion* - Lesions in the anterior occipital cortex, particularly the primary visual cortex, typically cause **macular sparing homonymous hemianopia** due to the dual blood supply to the macular representation area [1]. - Such lesions do not involve the afferent pupillary pathways and therefore would not cause a Wernicke's hemianopic pupil.

Q: The patient presents with unilateral proptosis and bilateral abducent nerve palsy. What is the most likely cause?

Cavernous sinus pathology. The patient presents with unilateral proptosis and bilateral abducent nerve palsy. What is the most likely cause? ***Cavernous sinus pathology*** - **Unilateral proptosis** combined with **bilateral abducens nerve palsy** is a classic presentation consistent with cavernous sinus involvement, as the abducens nerves (CN VI) pass through both cavernous sinuses and are vulnerable to pathology there. [1] - The cavernous sinus contains multiple cranial nerves (**III, IV, V1, V2, VI**) and the internal carotid artery, making it a critical anatomical location where lesions can cause complex neurological deficits affecting orbital structures and eye movements. [1] *Orbital cellulitis* - Typically presents with **unilateral proptosis**, pain, eyelid swelling, and fever, often following a sinus infection. - It primarily affects the **orbital contents anterior to the orbital septum** and would not explain bilateral abducens nerve palsy. *Orbital pseudotumor* - Characterized by **unilateral proptosis**, pain, and diplopia due to idiopathic inflammation of orbital tissues. - While it can cause ophthalmoplegia, **bilateral abducens nerve palsy** is not a typical presentation for a condition usually confined to one orbit. *Orbital lymphoma* - Presents with **painless, slowly progressive unilateral proptosis** or an orbital mass. - While it can cause compressive symptoms, **bilateral abducens nerve palsy** is an atypical presentation as the disease usually remains confined to a single orbit.

Question 1

Which test is used to detect a relative afferent pupillary defect (RAPD)?

Accepted Answer

Swinging flashlight test

Answer

Tonometry

Answer

Slit-lamp examination

Answer

Perimetry

Question 2

All of the following are seen in 3rd nerve palsy except

Accepted Answer

Loss of abduction

Answer

Ptosis

Answer

Pupillary dilatation

Answer

Exotropia and hypotropia

Question 3

A 50-year-old woman presents with progressive visual loss in her right eye and pain with eye movements. An MRI shows optic nerve enhancement. Which condition is most likely?

Accepted Answer

Optic neuritis

Answer

Retinal detachment

Answer

Acute angle-closure glaucoma

Answer

Central retinal artery occlusion

Question 4

A patient presents with vertical diplopia and a head tilt. What is the most likely cause?

Accepted Answer

Superior oblique palsy

Answer

Medial rectus palsy

Answer

Lateral rectus palsy

Answer

Inferior rectus palsy

Question 5

Which of the following visual defects is most commonly associated with papilloedema?

Accepted Answer

Enlarged blind spot

Answer

Homonymous hemianopia

Answer

Amaurosis fugax

Answer

Homonymous quadrantanopia

Question 6

Painful eye movement is a feature of :

Accepted Answer

Iridocyclitis

Answer

Papilledema

Answer

Corneal ulcer

Answer

Vernal catarrh

Question 7

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

Accepted Answer

It is an example of gradual painless visual loss

Answer

No leak of dye is observed in fluorescein angiography

Answer

Seen in the 2nd or 3rd decade of life

Answer

It is inherited through mitochondrial DNA

Question 8

Which is the most common ocular finding in myasthenia gravis?

Accepted Answer

Ptosis

Answer

Lagophthalmos

Answer

Proptosis

Answer

Enophthalmos

Question 9

Incongruous Homonymous hemianopia with Wernicke's hemianopia pupil is seen with the lesion of

Accepted Answer

Optic tract lesion

Answer

Optic radiation lesion

Answer

Lateral geniculate body lesion

Answer

Anterior occipital cortex lesion

Question 10

The patient presents with unilateral proptosis and bilateral abducent nerve palsy. What is the most likely cause?

Accepted Answer

Cavernous sinus pathology

Answer

Orbital cellulitis

Answer

Orbital pseudotumor

Answer

Orbital lymphoma

Neuro-Ophthalmology — MCQs

Neuro-Ophthalmology — MCQs

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