Ocular Trauma — MCQs

Ocular Trauma Indian Medical PG Practice Questions and MCQs

Question 71: A young boy presents to the ophthalmology department with decreased vision, six months after being hit by a tennis ball in the eye. Which of the following findings on optical examination is suggestive of blunt injury to the eye?

A. Optic Neuritis
B. Pars Planitis
C. Vitreous base detachment (Correct Answer)
D. Equatorial edema

Explanation: **Explanation:** The correct answer is **Vitreous base detachment**. Blunt trauma to the eye causes a sudden compression of the globe along its anteroposterior axis with a compensatory expansion at the equator. This rapid deformation exerts significant tractional forces on the intraocular structures. **Why Vitreous Base Detachment is Correct:** The vitreous base is the strongest point of attachment between the vitreous and the retina/pars plana. In blunt trauma, the sudden equatorial expansion pulls the vitreous away from its attachments. A **vitreous base detachment** (often associated with a **dialysis of the retina**) is considered pathognomonic for blunt ocular trauma. It is a classic finding that can lead to delayed retinal detachment, explaining the patient's presentation six months later. **Analysis of Incorrect Options:** * **Optic Neuritis (A):** This is an inflammatory or demyelinating condition (e.g., Multiple Sclerosis) rather than a traumatic one. Blunt trauma typically causes *Traumatic Optic Neuropathy*, not neuritis. * **Pars Planitis (B):** This is a form of intermediate uveitis of idiopathic origin, characterized by "snowbanking" and "snowballs." It is not caused by mechanical trauma. * **Equatorial Edema (D):** While blunt trauma causes retinal edema (Berlin’s Edema or Commotio Retinae), it typically occurs at the **posterior pole** (macula) rather than being specifically described as "equatorial edema." **Clinical Pearls for NEET-PG:** * **Vossius Ring:** A ring of iris pigment on the anterior lens capsule; a hallmark of blunt trauma. * **Berlin’s Edema:** Cherry red spot appearance at the macula due to milky white cloudiness of the retina following blunt injury. * **Angle Recession:** Tearing of the ciliary muscle fibers; the most common cause of secondary glaucoma after blunt trauma. * **Rosette Cataract:** The characteristic lens opacity seen following blunt ocular injury.

Question 72: Which of the following conditions cannot be diagnosed by direct ophthalmoscopy?

A. Diabetic retinopathy
B. Retinitis pigmentosa
C. Angle recession (Correct Answer)
D. Papilledema

Explanation: **Explanation:** The correct answer is **Angle recession (Option C)**. **1. Why Angle Recession is the Correct Answer:** Angle recession refers to a tear between the longitudinal and circular muscles of the ciliary body, typically following blunt ocular trauma. This anatomical structure is located in the **anterior chamber angle**. Direct ophthalmoscopy is designed to visualize the posterior segment (fundus). The anterior chamber angle cannot be seen directly because of **total internal reflection** of light at the tear film-air interface. To visualize this area, a **Gonioscope** (using a Gonio lens like Goldmann or Zeiss) is mandatory to overcome this optical barrier. **2. Why the Other Options are Incorrect:** * **Diabetic Retinopathy (A):** Characterized by microaneurysms, hemorrhages, and exudates on the retina, which are easily visible via direct ophthalmoscopy. * **Retinitis Pigmentosa (B):** Presents with "bony spicule" pigmentation in the mid-peripheral retina, which can be visualized by asking the patient to look in different directions during direct ophthalmoscopy. * **Papilledema (D):** This involves swelling of the optic disc. Direct ophthalmoscopy is the classic bedside tool used to identify blurring of disc margins and loss of venous pulsations. **Clinical Pearls for NEET-PG:** * **Direct Ophthalmoscope:** Provides a **15x magnified, erect, and virtual image**. It has a limited field of view (approx. 10°) and lacks stereopsis (3D view). * **Indirect Ophthalmoscope:** Provides a **real, inverted image** with a wider field of view and stereopsis. * **Angle Recession:** It is a high-yield association with **traumatic glaucoma**. If >180° of the angle is involved, the risk of secondary glaucoma increases significantly.

Question 73: What is the first sign of sympathetic ophthalmitis?

A. Circumcorneal congestion
B. Hypopyon
C. Retrolental flare (Correct Answer)
D. Iris nodule

Explanation: **Explanation:** **Sympathetic Ophthalmitis (SO)** is a rare, bilateral granulomatous panuveitis that occurs following a penetrating ocular injury or intraocular surgery. It is characterized by an autoimmune response against uveal antigens in the non-injured eye (the "sympathizing eye"). **Why Retrolental Flare is the correct answer:** The earliest clinical sign of sympathetic ophthalmitis is the presence of **retrolental flare** (or cells) in the retrolental space (the space behind the lens). This represents the initial breakdown of the blood-aqueous barrier and the onset of inflammation in the sympathizing eye. Detecting this sign is crucial for early diagnosis and the initiation of aggressive immunosuppressive therapy. **Analysis of Incorrect Options:** * **A. Circumcorneal congestion:** While present in SO, it is a non-specific sign of any anterior segment inflammation and typically appears after the initial retrolental changes. * **B. Hypopyon:** SO is a granulomatous uveitis; while severe inflammation can occur, a sterile hypopyon is rare and not an early or characteristic feature. * **D. Iris nodules:** These (Koeppe or Busacca nodules) are features of granulomatous uveitis but develop later in the disease course as the inflammation progresses. **High-Yield Clinical Pearls for NEET-PG:** * **Inciting Eye:** The injured eye; **Sympathizing Eye:** The non-injured eye. * **Latent Period:** Usually 2 weeks to 3 months (90% occur within 1 year). * **Pathology:** Characterized by **Dalen-Fuchs nodules** (clusters of epithelioid cells between the RPE and Bruch’s membrane) and a "sparing of the choriocapillaris." * **Prevention:** Enucleation of a severely injured eye with no visual potential within **2 weeks** (10–14 days) of injury can prevent SO. * **Treatment:** Systemic corticosteroids and long-term immunosuppressants.

Question 74: The incidence of retained intraocular foreign bodies is maximum with injuries due to which of the following mechanisms?

A. Blunt trauma
B. Penetrating trauma with blunt object (Correct Answer)
C. High-velocity projectile
D. Low-velocity projectile or sharp object

Explanation: ### Explanation The incidence of retained intraocular foreign bodies (IOFB) is highest in **penetrating trauma caused by blunt objects** (such as a hammer and chisel). This occurs because the mechanism involves a high-energy impact that generates enough force to breach the globe's integrity, yet the object is often small or brittle enough to fragment and lodge within the eye rather than passing through it. **Analysis of Options:** * **Penetrating trauma with blunt object (Correct):** The classic "hammer and chisel" injury is the most common cause of IOFBs. The blunt-on-blunt impact creates high-velocity micro-fragments that easily penetrate the sclera or cornea and remain trapped in the posterior segment. * **Blunt trauma:** By definition, blunt trauma involves an intact globe (closed-globe injury). While it can cause internal damage (e.g., hyphema or retinal detachment), it does not typically involve a foreign body entering the eye. * **High-velocity projectile:** While these frequently cause IOFBs, they often result in **perforating injuries** (entry and exit wounds), where the object passes entirely through the globe, rather than being "retained." * **Low-velocity/Sharp objects:** These (like knives or needles) usually cause clean lacerations. Because they are often large and held by the hand, they are withdrawn after the injury rather than being left behind inside the eye. **Clinical Pearls for NEET-PG:** * **Most common site of IOFB:** The **posterior segment** (approx. 85%). * **Most common material:** **Iron/Steel** (Siderosis bulbi is a potential complication). * **Gold Standard Investigation:** **Non-contrast CT (NCCT) of the Orbit** (1 mm cuts) is the investigation of choice. * **Contraindication:** **MRI** is strictly contraindicated if a metallic IOFB is suspected. * **Management:** Immediate surgical removal (usually via Pars Plana Vitrectomy) is indicated to prevent endophthalmitis and chemical toxicity.

Question 75: Which of the following protozoa can affect the eye?

A. Entamoeba histolytica
B. Toxoplasmosis (Correct Answer)
C. Giardia lamblia
D. Escherichia coli

Explanation: **Explanation:** The correct answer is **Toxoplasmosis**. **Toxoplasma gondii** is an obligate intracellular protozoan that is the most common cause of posterior uveitis worldwide. It has a specific predilection for the retina. In the eye, it typically presents as **focal necrotizing retinochoroiditis**. * **Congenital Toxoplasmosis:** Often presents with the classic triad of chorioretinitis, hydrocephalus, and intracranial calcifications. * **Acquired Toxoplasmosis:** Usually occurs due to ingestion of oocysts (from cat feces) or bradyzoites (undercooked meat), leading to a "headlight in the fog" appearance on fundoscopy due to active vitritis over a retinal lesion. **Analysis of Incorrect Options:** * **Entamoeba histolytica:** A protozoan causing amoebic dysentery and liver abscesses; it does not typically involve the eye. (Note: *Acanthamoeba*, a different amoeba, causes keratitis in contact lens wearers). * **Giardia lamblia:** An intestinal protozoan causing malabsorption and diarrhea; it has no established ocular manifestations. * **Escherichia coli:** This is a **gram-negative bacterium**, not a protozoan. While it can rarely cause endogenous endophthalmitis, it does not fit the biological classification requested. **High-Yield Clinical Pearls for NEET-PG:** * **Drug of Choice:** Triple therapy (Pyrimethamine, Sulfadiazine, and Folinic acid) + Steroids. * **Classic Sign:** "Headlight in the fog" (active retinitis seen through vitreous haze). * **Recurrence:** Usually occurs at the margin of an old, pigmented "punched-out" scar. * **Differential:** Always rule out CMV retinitis in immunocompromised patients (pizza-pie appearance).

Question 76: What is the recommended initial treatment for ammonia exposure to the eye?

A. Consult an expert ophthalmologist.
B. Administer local anesthetic and irrigate the eye with normal saline. (Correct Answer)
C. Perform slit-lamp microscopy and mechanical cleaning.
D. Initiate systemic antibiotic therapy.

Explanation: **Explanation:** Chemical injuries to the eye, particularly **alkali burns** like ammonia, are true ocular emergencies. Ammonia is highly lipophilic and penetrates the ocular tissues rapidly by causing **liquefactive necrosis**, which leads to deep tissue destruction and potential blindness. **Why Option B is Correct:** The single most important factor in determining the visual outcome is the **speed of irrigation**. The immediate goal is to dilute the chemical and restore the physiological pH of the ocular surface. 1. **Local Anesthetic:** Administering topical drops (e.g., Proparacaine) is crucial to relieve blepharospasm and pain, allowing for effective irrigation. 2. **Irrigation:** Copious irrigation with Normal Saline or Ringer’s Lactate should be started immediately for at least 30 minutes or until the pH of the conjunctival sac returns to neutral (7.0–7.2). **Why Other Options are Incorrect:** * **Option A:** While an ophthalmologist must eventually manage the case, irrigation should never be delayed for a consultation. "Time is tissue." * **Option C:** Slit-lamp examination is necessary for grading the injury (Roper-Hall classification), but it is secondary to decontamination. Mechanical cleaning is only indicated if solid particles (like lime) are present. * **Option D:** Systemic antibiotics are not the initial priority. Management focuses on irrigation, followed by topical steroids, cycloplegics, and ascorbate. **High-Yield Clinical Pearls for NEET-PG:** * **Alkali vs. Acid:** Alkali burns (Ammonia, Lime) are more dangerous than acid burns because acids cause **coagulative necrosis**, which creates a barrier that limits deeper penetration. * **Roper-Hall Classification:** Based on corneal clarity and **limbal ischemia** (the most important prognostic factor). * **Management Tip:** Never use neutralizing acidic solutions to treat alkali burns, as the exothermic reaction can cause thermal damage. Use neutral fluids only.

Question 77: Vossius ring is seen in the:

A. Cornea
B. Anterior capsule of the lens (Correct Answer)
C. Posterior capsule of the lens
D. Iris

Explanation: **Explanation:** **Vossius ring** is a classic sign of **blunt ocular trauma**. It consists of a circular ring of pigment granules deposited on the **anterior capsule of the lens**. **Why it occurs:** When a blunt object strikes the eye, the force causes a sudden compression of the globe. This forces the pupillary margin of the iris to strike against the anterior surface of the lens with significant impact. The pigment from the posterior iris epithelium is "stamped" onto the lens capsule, forming a ring that corresponds exactly to the diameter of the pupil at the time of injury. **Analysis of Options:** * **Option B (Correct):** As described, the pigment is deposited on the anterior lens capsule. * **Option A (Cornea):** While blunt trauma can cause corneal abrasions or blood staining (in cases of hyphaema), the specific circular pigment ring of Vossius is not found here. * **Option C (Posterior capsule):** The posterior capsule is not in contact with the iris; trauma here is more likely to result in a "Rosette cataract." * **Option D (Iris):** The iris is the *source* of the pigment, not the site where the ring is visualized. **Clinical Pearls for NEET-PG:** * **Visual Significance:** Vossius ring itself is usually asymptomatic and does not interfere with vision, but it serves as a permanent "footprint" of past blunt trauma. * **Associated Finding:** Always look for a **Rosette-shaped cataract** (concussion cataract) in patients with a Vossius ring, as both result from blunt trauma. * **Differential:** Do not confuse this with **Kayser-Fleischer (KF) ring**, which is copper deposition in the Descemet’s membrane of the cornea (Wilson’s disease).

Question 78: After blunt trauma to the eye, a patient develops circumcorneal congestion. What is the next appropriate test to be done?

A. Perimetry
B. Direct ophthalmoscopy
C. Ultrasonography
D. Intraocular pressure measurement (Correct Answer)

Explanation: **Explanation:** **1. Why Intraocular Pressure (IOP) Measurement is Correct:** Circumcorneal congestion (ciliary flush) following blunt trauma is a hallmark sign of **Traumatic Uveitis** or **Secondary Glaucoma**. In the acute post-traumatic phase, measuring IOP is the most critical next step because blunt trauma can cause a sudden rise in pressure via several mechanisms: * **Hyphema:** Blood in the anterior chamber blocking the trabecular meshwork. * **Trabecular Meshwork Edema:** Direct "concussion" of the drainage angle. * **Angle Recession:** Tearing of the ciliary body face (though often a late finding, it starts at the time of impact). * **Pupillary Block:** Due to lens subluxation or dislocation. Early detection of ocular hypertension is vital to prevent optic nerve damage and corneal blood staining. **2. Why Other Options are Incorrect:** * **A. Perimetry:** This tests visual fields. It is used for chronic glaucoma management or neurological deficits, not for the acute evaluation of trauma. * **B. Direct Ophthalmoscopy:** While fundus examination is important, direct ophthalmoscopy provides a limited view and is often difficult if there is a hazy media (edema or hyphema). It is not the immediate priority over IOP. * **C. Ultrasonography (B-Scan):** This is indicated only if the posterior segment cannot be visualized due to dense vitreous hemorrhage or total cataract. It is not the "next" step before basic clinical parameters like IOP. **Clinical Pearls for NEET-PG:** * **Vossius Ring:** A ring of pigment on the anterior lens capsule (pathognomonic for blunt trauma). * **Angle Recession:** The most common cause of delayed-onset glaucoma after blunt trauma (look for a "widened ciliary body band" on gonioscopy). * **Goldmann Applanation Tonometry (GAT):** The gold standard for measuring IOP, though non-contact tonometry is often used for screening.

Question 79: Berlin's edema is seen due to which of the following?

A. Trauma (Correct Answer)
B. Foreign body
C. Infection
D. Pars planitis

Explanation: **Explanation:** **Berlin’s Edema**, also known as **Commotio Retinae**, is a common consequence of **blunt ocular trauma**. When the eye is struck by a high-velocity object, the resulting coup or contrecoup force causes a pressure wave to travel through the globe. This leads to mechanical disruption of the outer retinal layers (specifically the photoreceptors and retinal pigment epithelium), resulting in intracellular edema. * **Why Trauma is Correct:** The hallmark clinical sign is a **milky-white opacification** of the retina, typically in the posterior pole. If the macula is involved, a **"Cherry Red Spot"** may appear because the fovea is thin and allows the underlying vascular choroid to show through the surrounding edematous retina. * **Why other options are incorrect:** * **Foreign Body:** While an intraocular foreign body is a type of trauma, Berlin's edema specifically refers to the widespread retinal "stunning" or concussion caused by blunt impact rather than penetrating injury or localized foreign body reactions (like siderosis). * **Infection:** Endophthalmitis or retinitis presents with inflammatory exudates, vitreous haze, and pain, rather than the transient white opacification seen in Commotio Retinae. * **Pars Planitis:** This is a form of intermediate uveitis characterized by "snowbanking" and "snowballs" in the vitreous, not acute traumatic retinal whitening. **High-Yield Clinical Pearls for NEET-PG:** * **Prognosis:** Most cases are self-limiting and resolve within 1–2 weeks without specific treatment. * **Histopathology:** It is not true extracellular edema; it is primarily characterized by **disruption of the photoreceptor outer segments**. * **Differential Diagnosis for Cherry Red Spot:** Remember the mnemonic **"CRAZY"** (CRAO, Retinal edema/Berlin's, Amaurotic familial idiocy/Tay-Sachs, Zealous-Niemann Pick).

Question 80: A patient presents with enophthalmos after trauma to the face by a blunt object. There is no fever and no extraocular muscle palsy. What is the diagnosis?

A. Fracture of the maxilla
B. Fracture of the zygoma
C. Blow-out fracture (Correct Answer)
D. Fracture of the ethmoid

Explanation: **Explanation:** The clinical presentation of **enophthalmos** (recession of the eyeball) following blunt trauma to the orbit is a classic hallmark of a **Blow-out fracture**. **1. Why Blow-out Fracture is correct:** A blow-out fracture occurs when a blunt object (larger than the orbital rim, like a tennis ball or fist) strikes the orbit. The sudden increase in intraorbital pressure causes the thin walls of the orbit to give way—most commonly the **orbital floor** (maxillary bone). Enophthalmos occurs because the orbital volume increases as the orbital fat and contents herniate into the maxillary sinus. While diplopia due to inferior rectus entrapment is common, it is not always present, making enophthalmos the key diagnostic feature here. **2. Why other options are incorrect:** * **Fracture of the Maxilla/Zygoma:** These typically involve the **orbital rim**. If the rim is fractured, it is technically not a "pure" blow-out fracture. These fractures usually present with significant facial deformity, malar flattening, or "step-off" deformities rather than isolated enophthalmos. * **Fracture of the Ethmoid:** This involves the medial wall (lamina papyracea). While it can cause enophthalmos, it is more characteristically associated with **orbital emphysema** (air in the orbit), often noticed when the patient blows their nose. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Orbital floor (specifically the thin bone medial to the infraorbital canal). * **Second most common site:** Medial wall (Ethmoid bone). * **Nerve involved:** Infraorbital nerve (leads to anesthesia of the cheek and upper gum). * **Investigation of choice:** CT Scan Orbit (Coronal view) showing the **"Teardrop sign"** (herniated orbital contents in the maxillary sinus). * **Management:** Initial conservative management (nasal decongestants, avoid blowing nose); surgery is indicated if there is persistent diplopia or significant enophthalmos (>2mm).

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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