Ocular Trauma — MCQs

Ocular Trauma Indian Medical PG Practice Questions and MCQs

Question 61: A patient presents with a traumatic eye exhibiting late signs of hyperemic sclera and unilateral proptosis. What is the most likely cause?

A. Retrobulbar hematoma
B. Retrobulbar cellulitis (Correct Answer)
C. Caroticocavernous fistula
D. Pneumo-orbit

Explanation: **Explanation:** The clinical presentation of **unilateral proptosis** and **hyperemic sclera** following trauma, specifically as a **late sign**, points toward an infectious or inflammatory complication rather than an acute mechanical one. **1. Why Retrobulbar Cellulitis is correct:** Post-traumatic orbital (retrobulbar) cellulitis occurs when trauma introduces pathogens into the orbital space (e.g., via a retained foreign body or spread from an adjacent infected sinus). Unlike acute vascular events, cellulitis takes time to develop (usually 48–72 hours or more), explaining the "late signs." The hyperemia is due to inflammatory vasodilation, and proptosis results from inflammatory edema and mass effect within the closed orbital space. **2. Why the other options are incorrect:** * **Retrobulbar hematoma:** This is an **acute** emergency occurring immediately or shortly after trauma. It presents with rapid-onset proptosis, severe pain, and increased intraocular pressure (compartment syndrome), not as a "late sign." * **Caroticocavernous fistula (CCF):** While it causes proptosis and "corkscrew" epibulbar vessels, it typically presents with **pulsatile** proptosis and an audible orbital bruit. While it can be a late complication of trauma, the classic description of "hyperemic sclera" in a post-traumatic context most frequently tests the knowledge of secondary infection. * **Pneumo-orbit:** This involves air in the orbit (usually from a medial wall/ethmoid sinus fracture). It typically presents with crepitus on palpation and resolves spontaneously; it does not typically cause significant scleral hyperemia. **Clinical Pearls for NEET-PG:** * **Acute Proptosis + Trauma:** Think Retrobulbar Hematoma (Management: Lateral Canthotomy). * **Pulsatile Proptosis + Bruit:** Think Caroticocavernous Fistula. * **Proptosis + Restricted Extraocular Movements + Fever:** Think Orbital Cellulitis. * **Most common cause of Orbital Cellulitis:** Sinusitis (Ethmoid sinus).

Question 62: Which of the following is an ocular emergency?

A. Central retinal artery occlusion (CRAO)
B. Optic neuritis
C. Acute congestive glaucoma
D. All of the above (Correct Answer)

Explanation: **Explanation:** In ophthalmology, an **ocular emergency** is defined as a condition that requires immediate diagnosis and intervention (within minutes to hours) to prevent permanent loss of vision or irreversible ocular damage. 1. **Central Retinal Artery Occlusion (CRAO):** This is often described as an "eye stroke." The retina has a very high metabolic rate; complete occlusion leads to irreversible ischemic damage to the inner retinal layers within 90–100 minutes. It presents as sudden, painless, profound loss of vision with a characteristic **"cherry-red spot"** on fundoscopy. 2. **Acute Congestive Glaucoma (Acute Angle Closure):** This is a surgical emergency caused by a sudden rise in intraocular pressure (IOP). If not lowered immediately, the high pressure causes ischemic damage to the optic nerve head and permanent blindness. It presents with severe pain, colored halos, and a mid-dilated non-reactive pupil. 3. **Optic Neuritis:** While sometimes considered "urgent" rather than "emergent" in a surgical sense, in the context of competitive exams, it is classified as a medical emergency. Rapid inflammatory demyelination of the optic nerve (often associated with Multiple Sclerosis) requires prompt corticosteroid therapy to accelerate recovery and rule out compressive lesions. **Clinical Pearls for NEET-PG:** * **CRAO Management:** Immediate ocular massage, paracentesis, and inhaled Carbogen to dislodge the embolus. * **Acute Glaucoma Management:** Immediate IV Mannitol, Acetazolamide, and topical Pilocarpine (once IOP drops) followed by **Peripheral Iridotomy** (definitive treatment). * **Marcus Gunn Pupil (RAPD):** A common finding in both Optic Neuritis and severe CRAO. * **True Emergency vs. Urgent:** Chemical burns (especially alkali) are the only true "immediate" emergencies where treatment (irrigation) starts before even taking a history.

Question 63: Blunt trauma to the eye may produce all of the following changes in the vitreous except?

A. Syneresis
B. Asteroid hyalosis (Correct Answer)
C. Synchisis scintillans
D. Liquefaction

Explanation: **Explanation:** The correct answer is **Asteroid hyalosis** because it is a degenerative condition associated with aging, not trauma. **1. Why Asteroid Hyalosis is the correct answer:** Asteroid hyalosis is characterized by the presence of small, white, spherical bodies (calcium-lipid complexes) suspended in a solid vitreous. It is typically unilateral, asymptomatic, and occurs in older individuals (usually >60 years). It is **not** caused by trauma, inflammation, or intraocular hemorrhage. Crucially, in asteroid hyalosis, the vitreous remains structurally stable (no liquefaction). **2. Analysis of incorrect options (Trauma-related changes):** * **Syneresis and Liquefaction (Options A & D):** These terms are often used interchangeably in the context of trauma. Blunt trauma causes mechanical agitation of the vitreous gel, leading to the breakdown of the collagen network and the release of water. This process of gel collapsing and turning into liquid is known as liquefaction (synchisis) and syneresis. * **Synchisis Scintillans (Option C):** This condition involves the accumulation of cholesterol crystals in a **liquefied** vitreous. Unlike asteroid hyalosis, synchisis scintillans is a sequela of chronic intraocular disease, most commonly **vitreous hemorrhage** following blunt trauma. The crystals settle at the bottom of the eye due to gravity and "shower" upward with eye movements. **NEET-PG High-Yield Pearls:** * **Asteroid Hyalosis:** Calcium-lipid bodies; "Snowball" appearance; Vitreous is **solid**; No effect on vision. * **Synchisis Scintillans:** Cholesterol crystals; "Golden shower" appearance; Vitreous is **fluid/liquefied**; Associated with old trauma/hemorrhage. * **Vossius Ring:** A circular pigment deposit on the anterior lens capsule, a classic sign of blunt trauma. * **Commotio Retinae (Berlin’s Edema):** Milky white cloudiness of the retina following blunt trauma, typically involving the macula.

Question 64: What is the earliest symptom of sympathetic ophthalmia?

A. Photophobia (Correct Answer)
B. Pain
C. Loss of near vision
D. Loss of distant vision

Explanation: **Explanation:** **Sympathetic Ophthalmia (SO)** is a rare, bilateral granulomatous panuveitis that occurs following a penetrating ocular injury or intraocular surgery in one eye (the **exciting eye**), which subsequently affects the non-injured eye (the **sympathizing eye**). **1. Why Photophobia is Correct:** The earliest clinical manifestation of sympathetic ophthalmia is **photophobia** and a slight blurring of vision in the sympathizing eye. This occurs due to early ciliary irritation and the onset of acute anterior uveitis. In the context of NEET-PG, photophobia is classically recognized as the "prodromal" or earliest symptom, often accompanied by a loss of accommodation (difficulty with near work). **2. Analysis of Incorrect Options:** * **Pain:** While ocular discomfort occurs as inflammation progresses, it is usually not the *earliest* symptom. The initial presentation is often more subtle. * **Loss of near vision:** This is a very early sign caused by the weakness of accommodation (cyclitis), but it typically follows or coincides with the onset of photophobia. * **Loss of distant vision:** This occurs later in the disease course due to exudative retinal detachment, pupillary membranes, or secondary cataracts. **3. Clinical Pearls for NEET-PG:** * **Latent Period:** Most cases occur within 2 weeks to 3 months after injury (Rule of thumb: "90% within 1 year"). * **Pathognomonic Sign:** **Dalen-Fuchs nodules** (small, white-yellow spots between the RPE and Bruch’s membrane). * **Histopathology:** Characterized by non-necrotizing granulomatous inflammation with **sparing of the choriocapillaris**. * **Prevention:** Evisceration does not prevent SO as effectively as **enucleation**. To prevent SO, the injured eye should be enucleated within 10–14 days if it has no visual potential.

Question 65: Snow blindness is caused by?

A. Ultraviolet rays (Correct Answer)
B. Infrared rays
C. Microwaves
D. Defect in mirror

Explanation: **Snow blindness**, clinically known as **Photokeratitis**, is an acute ocular condition caused by overexposure to **Ultraviolet (UV) radiation**, specifically **UV-B rays**. ### Explanation of Options: * **A. Ultraviolet rays (Correct):** Fresh snow reflects up to 80% of UV radiation. When an individual is exposed to this reflected light without protection, the UV-B rays are absorbed by the corneal epithelium. This leads to punctate epithelial erosions (keratitis). Symptoms typically appear after a latent period of 6–12 hours and include intense pain, photophobia, and a foreign body sensation. * **B. Infrared rays:** These are associated with thermal damage. Chronic exposure to infrared rays (e.g., in glass blowers or furnace workers) leads to **Glass-blower’s cataract** (true exfoliation of the lens capsule). * **C. Microwaves:** Exposure to microwave radiation is primarily linked to the development of **thermal cataracts** due to the heating of the lens proteins. * **D. Defect in mirror:** This is a distractor and has no clinical correlation with snow blindness or radiation-induced ocular injury. ### High-Yield Clinical Pearls for NEET-PG: * **Welders’ Flash:** This is the same clinical entity as snow blindness, caused by the UV radiation emitted from an electric welding arc. * **Management:** Treatment is supportive, involving **topical antibiotic eye ointments**, patching for 24 hours, and systemic analgesics. The corneal epithelium usually regenerates within 24–48 hours. * **Eclipse Retinopathy:** Unlike snow blindness (which affects the cornea), viewing a solar eclipse causes photochemical damage to the **macula** (fovea) via UV-A and visible light. * **Key Association:** UV-B is the primary culprit for both Photokeratitis and the formation of **Pterygium**.

Question 66: A 60-year-old man presented with watering from his left eye for one year. Syringing revealed a patent drainage system. The rest of the ocular examination was normal. A provisional diagnosis of lacrimal pump failure was made. Confirmation of the diagnosis would be by:

A. Dacryoscintigraphy (Correct Answer)
B. Dacryocystography
C. Pressure syringing
D. Canaliculus irrigation test

Explanation: ### Explanation The clinical scenario describes **Functional Epiphora** (Lacrimal Pump Failure). In this condition, the patient experiences tearing despite a physically patent lacrimal drainage system (as confirmed by syringing). This occurs due to orbicularis oculi weakness or eyelid laxity, which prevents the physiological "pumping" of tears into the lacrimal sac. **Why Dacryoscintigraphy is the Correct Answer:** Dacryoscintigraphy (Radionuclide Cystography) is the **gold standard** for evaluating the functional patency of the lacrimal system. It involves instilling a radioactive tracer (Technetium-99m) into the conjunctival sac and monitoring its progress with a gamma camera. Unlike syringing, which uses manual pressure, this test mimics physiological tear flow. If the tracer fails to move despite a patent system on syringing, lacrimal pump failure is confirmed. **Analysis of Incorrect Options:** * **B. Dacryocystography (DCG):** This involves injecting radiopaque contrast followed by X-rays. It is excellent for identifying the **anatomical site of obstruction** (e.g., strictures or stones) but does not assess functional flow. * **C. Pressure Syringing:** This is used to overcome minor obstructions or to check for partial patency. It uses external force and cannot diagnose a failure of the physiological pump mechanism. * **D. Canaliculus Irrigation Test:** This is essentially standard syringing used to check for anatomical patency of the canaliculi; it cannot evaluate functional dynamics. **Clinical Pearls for NEET-PG:** * **Jones Dye Test I:** Differentiates between partial obstruction and hypersecretion. * **Jones Dye Test II:** Differentiates between canalicular and nasolacrimal duct obstruction. * **Primary Lacrimal Pump:** Orbicularis oculi muscle (specifically the lacrimal part/Horner's muscle). * **First-line investigation for epiphora:** Fluorescein Disappearance Test (FDT) or Syringing.

Question 67: What is deposited in Kayser-Fleischer ring?

A. Copper (Correct Answer)
B. Lead
C. Mercury
D. Iron

Explanation: **Explanation:** The **Kayser-Fleischer (KF) ring** is a hallmark clinical sign of **Wilson’s Disease** (hepatolenticular degeneration). It is caused by the deposition of **Copper** in the **Descemet’s membrane** of the cornea. Due to a deficiency in the copper-transporting protein *ceruloplasmin*, excess free copper accumulates in various tissues, including the liver, basal ganglia, and the periphery of the cornea. * **Why Copper is Correct:** In Wilson's Disease, copper deposits typically start at the superior pole of the cornea, eventually forming a golden-brown or greenish ring. It is best visualized using a **Slit-lamp examination**, though it may be visible to the naked eye in advanced cases. * **Why other options are incorrect:** * **Lead:** Lead poisoning (Plumbism) does not cause corneal rings; it is associated with "Burtonian lines" (bluish-grey lines on the gums). * **Mercury:** Chronic mercury exposure can cause *Mercuria lentis* (a brownish discoloration of the anterior lens capsule), but not a corneal ring. * **Iron:** Iron deposition in the cornea is known as a **Fleischer ring** (seen in Keratoconus) or a **Hudson-Stahli line** (age-related). Note the distinction: *Kayser-Fleischer* is Copper; *Fleischer* is Iron. **High-Yield Pearls for NEET-PG:** 1. **Location:** Specifically the **Descemet’s membrane** (not the epithelium or stroma). 2. **Reversibility:** The KF ring may disappear with effective chelation therapy (e.g., D-Penicillamine). 3. **Sunflower Cataract:** Another ocular finding in Wilson’s disease involving copper deposition in the anterior lens capsule. 4. **Chalcosis:** The term for intraocular copper foreign body, which can lead to rapid endophthalmitis if the copper content is high (>85%).

Question 68: All of the following are true of chemical burns of the eye except?

A. Acid burns are more serious than alkali burns. (Correct Answer)
B. Alkalies combine with lipids of cells to form soluble compounds, which produce a condition of softening and gelatinisation.
C. Acids cause instant coagulation of all the proteins.
D. Symblepharon is a distressing sequela.

Explanation: **Explanation:** Chemical burns are ophthalmic emergencies where the mechanism of injury differs significantly between acids and alkalis. **Why Option A is the Correct Answer (The False Statement):** **Alkali burns are more serious than acid burns.** Alkalis are lipophilic and penetrate the eye much deeper and faster than acids. Acids, conversely, tend to be less severe because they cause immediate protein coagulation, which creates a physical barrier that limits further penetration into the deeper ocular tissues. **Analysis of Other Options:** * **Option B:** This describes **Saponification**. Alkalis react with cellular lipids to form soluble compounds, leading to "liquefactive necrosis." This process allows the chemical to soften the tissue and penetrate rapidly into the anterior chamber. * **Option C:** Acids cause **Coagulative Necrosis**. They precipitate tissue proteins, forming a thick "eschar" or coagulum. This acts as a self-limiting shield, preventing the acid from reaching the internal structures of the eye. * **Option D:** **Symblepharon** (adhesion between the palpebral and bulbar conjunctiva) is a common and distressing late complication of chemical burns due to extensive mucosal scarring and loss of goblet cells. **High-Yield Clinical Pearls for NEET-PG:** * **Immediate Management:** The single most important step is **profuse irrigation** (with Ringer’s Lactate or Normal Saline) for at least 30 minutes or until the pH is neutralized (7.0–7.2). Do not wait for a specialist or vision testing. * **Roper-Hall Classification:** Used to grade severity based on corneal clarity and **limbal ischemia** (whitening). Limbal ischemia is the most important prognostic factor for corneal re-epithelialization. * **Worst Prognosis:** Ammonia ($NH_3$) and Sodium Hydroxide ($NaOH$) are among the most damaging alkalis due to rapid penetration.

Question 69: A patient presents with an iron foreign body in the eye. Which of the following is the best investigation to monitor his vision?

A. Serial Arden ratio
B. Dark adaptometry
C. Serial VEP
D. Serial ERG (Correct Answer)

Explanation: **Explanation:** The correct answer is **Serial ERG**. **Why Serial ERG is the correct choice:** An intraocular iron foreign body can lead to **Siderosis Bulbi**, a condition where iron ions dissociate and deposit in ocular tissues, causing oxidative damage. The retinal pigment epithelium and photoreceptors are particularly sensitive. **Electroretinography (ERG)** is the most sensitive investigation to detect early retinal toxicity. In siderosis, the ERG initially shows an increased 'a' wave (supernormal ERG), but as toxicity progresses, there is a characteristic **diminution of the 'b' wave amplitude**. Serial ERG is used to monitor this progression; a declining 'b' wave is a definitive indication for surgical removal of the foreign body, even if the patient is currently asymptomatic. **Analysis of Incorrect Options:** * **Serial Arden ratio (EOG):** The Arden ratio is derived from the Electro-oculogram (EOG), which measures the health of the Retinal Pigment Epithelium (RPE). While it may be affected in late stages, it is not as sensitive or standard as ERG for monitoring siderosis. * **Dark adaptometry:** This tests rod function and is used primarily in Vitamin A deficiency or Retinitis Pigmentosa. It is not a specific or reliable tool for monitoring metallic toxicity. * **Serial VEP:** Visual Evoked Potential (VEP) measures the integrity of the visual pathway from the optic nerve to the cortex. It is useful in optic neuritis or compression but does not reflect early retinal siderotic changes. **Clinical Pearls for NEET-PG:** * **Siderosis Bulbi:** Features include "Rusty" corneal deposits, heterochromia iridis (darker iris), and cataract with subcapsular rusty spots. * **Chalcosis:** Caused by a copper foreign body; leads to a **Sunflower cataract** and Kayser-Fleischer rings. * **Imaging Gold Standard:** Non-contrast CT (NCCT) of the orbit is the investigation of choice for detecting metallic foreign bodies. **MRI is strictly contraindicated** if a metallic foreign body is suspected.

Question 70: Blow out fracture refers to which of the following?

A. Fracture of orbit (Correct Answer)
B. Fracture of nasal septum
C. Fracture of base of skull
D. Fracture of mandible

Explanation: **Explanation:** A **blow-out fracture** is a traumatic deformity of the orbital floor or wall, typically caused by a blunt object (like a tennis ball or fist) that is larger than the orbital rim. When such an object strikes the eye, it increases intraorbital pressure, causing the thin bones of the orbit to "blow out" into the adjacent sinuses. * **Why Option A is correct:** The orbit is a bony cavity. The most common site of a blow-out fracture is the **orbital floor** (specifically the maxillary bone in the posteromedial part), followed by the **medial wall** (lamina papyracea). This is a classic orbital injury. * **Why Options B, C, and D are incorrect:** These refer to fractures of different facial or cranial structures. While they may occur concurrently in severe maxillofacial trauma (like Le Fort fractures), they do not define a "blow-out" injury, which is specific to the orbital walls while the orbital rim remains intact. **High-Yield Clinical Pearls for NEET-PG:** 1. **Clinical Features:** Enophthalmos (sunken eye), diplopia (double vision), and infraorbital nerve anesthesia (numbness of the cheek/upper lip). 2. **Muscle Entrapment:** The **Inferior Rectus muscle** is most commonly entrapped in floor fractures, leading to restricted upward gaze. 3. **Radiology:** The **"Teardrop sign"** on a Water’s view X-ray indicates herniation of orbital contents into the maxillary sinus. 4. **Black Eyebrow Sign:** Presence of intraorbital air (emphysema) on imaging, usually seen if the medial wall/ethmoid sinus is involved. 5. **Management:** Initial conservative management with ice packs and antibiotics; surgery is indicated if there is persistent diplopia or significant enophthalmos.

Practice by Chapter

Classification of Ocular Trauma

Practice Questions

Blunt Trauma

Practice Questions

Penetrating and Perforating Injuries

Practice Questions

Intraocular Foreign Bodies

Practice Questions

Chemical Injuries

Practice Questions

Thermal and Radiation Injuries

Practice Questions

Orbital Trauma

Practice Questions

Traumatic Optic Neuropathy

Practice Questions

Ocular Manifestations of Child Abuse

Practice Questions

Sports-Related Eye Injuries

Practice Questions

Ocular Trauma Management Principles

Practice Questions

Rehabilitation After Ocular Trauma

Practice Questions

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