Ocular Trauma — MCQs

Ocular Trauma Indian Medical PG Practice Questions and MCQs

Question 11: Dalen Fuch's nodules are seen in which of the following conditions?

A. Sympathetic ophthalmitis (Correct Answer)
B. Chronic iridocyclitis
C. Neurofibromatosis
D. Trachoma

Explanation: **Explanation:** **Dalen-Fuchs nodules** are a pathognomonic histopathological feature of **Sympathetic Ophthalmitis (SO)**. SO is a rare, bilateral granulomatous panuveitis that occurs following a penetrating ocular injury or intraocular surgery in one eye (the "exciting eye"), leading to an autoimmune inflammatory response in the fellow eye (the "sympathizing eye"). * **Why Option A is correct:** Dalen-Fuchs nodules are small, yellowish-white inflammatory aggregates located between the **Retinal Pigment Epithelium (RPE) and Bruch’s membrane**. Histologically, they consist of epithelioid cells, macrophages, and pigment-laden cells. * **Why Option B is incorrect:** Chronic iridocyclitis (non-specific) typically presents with Keratic Precipitates (KPs) and synechiae but lacks these specific sub-RPE granulomatous nodules. * **Why Option C is incorrect:** Neurofibromatosis is associated with **Lisch nodules**, which are melanocytic hamartomas found on the iris surface. * **Why Option D is incorrect:** Trachoma is characterized by **Herbert’s pits** (limbal follicles) and Arlt’s lines (conjunctival scarring), not intraocular granulomas. **High-Yield Clinical Pearls for NEET-PG:** * **Sympathetic Ophthalmitis:** The latent period is usually 4–8 weeks post-injury (can range from days to years). * **Histopathology of SO:** Characterized by "non-necrotizing granulomatous inflammation" with **sparing of the choriocapillaris** (unlike Vogt-Koyanagi-Harada syndrome). * **Management:** Prevention involves the enucleation of a severely injured eye with no visual potential within 10–14 days. Treatment involves long-term systemic corticosteroids and immunosuppressants.

Question 12: In blowout fractures, which of the following findings is typically observed?

A. Enophthalmos (Correct Answer)
B. Exophthalmos
C. Bulbar hemorrhage
D. None of the above

Explanation: ### Explanation **1. Why Enophthalmos is Correct:** A blowout fracture occurs when a blunt object (larger than the orbital rim, like a tennis ball) strikes the eye, causing a sudden increase in intraorbital pressure. This pressure is transmitted to the weakest parts of the orbital floor (maxillary bone) or medial wall (ethmoid bone). **Enophthalmos** (posterior displacement of the eyeball) occurs due to two primary mechanisms: * **Increased Orbital Volume:** The fracture creates a "trapdoor" or defect, allowing orbital contents to herniate into the maxillary sinus. * **Fat Atrophy:** Post-traumatic necrosis of orbital fat further reduces the support behind the globe. **2. Why Incorrect Options are Wrong:** * **Exophthalmos (B):** This refers to the protrusion of the eyeball. While initial inflammatory edema or a retrobulbar hemorrhage might cause temporary proptosis, the hallmark structural consequence of a blowout fracture is the loss of orbital floor integrity leading to enophthalmos. * **Bulbar Hemorrhage (C):** While subconjunctival hemorrhage is common in ocular trauma, "bulbar hemorrhage" is a non-specific term and not a defining diagnostic feature of a blowout fracture compared to the mechanical displacement of the globe. **3. High-Yield Clinical Pearls for NEET-PG:** * **Most Common Site:** The **orbital floor** (specifically the posteromedial portion of the maxillary bone) is the most common site. * **Clinical Triad:** Enophthalmos, Diplopia (especially on upward gaze), and Infraorbital anesthesia (due to damage to the infraorbital nerve). * **Muscle Entrapment:** The **Inferior Rectus** muscle is most commonly entrapped, leading to restricted upward gaze. * **Radiology:** The **"Teardrop Sign"** on a Waters’ view X-ray or CT scan indicates herniated orbital fat and muscle into the maxillary sinus. * **Initial Management:** Advise the patient **not to blow their nose**, as this can cause orbital emphysema (air entering the orbit from the sinuses).

Question 13: Blunt injury to the eye causes recession of the angle of the eye because of?

A. Tear of the ciliary body (Correct Answer)
B. Schlemm canal split
C. Trabecular meshwork split
D. Dislocation of the lens

Explanation: **Explanation:** **Angle recession** is a common complication of blunt ocular trauma. It occurs due to a longitudinal tear in the **ciliary body**, specifically between the longitudinal and circular muscle fibers. 1. **Why Option A is correct:** When a blunt object strikes the eye, it causes sudden anteroposterior compression and lateral expansion. This creates a hydraulic pressure wave that forces aqueous humor into the angle. The resulting stress causes a **cleft (tear) in the ciliary body**. This tear allows the iris root and the circular fibers of the ciliary body to shift posteriorly, making the anterior chamber angle appear abnormally deep on gonioscopy. 2. **Why other options are incorrect:** * **B & C:** While the Schlemm’s canal and Trabecular meshwork (TM) can be damaged in trauma (leading to trabeculodysgenesis), a "split" in these structures does not define angle recession. However, scarring of the TM following the initial injury is what eventually leads to secondary glaucoma. * **D:** Lens dislocation (ectopia lentis) is a separate complication of blunt trauma caused by the rupture of zonules, not a tear in the angle structures. **High-Yield Clinical Pearls for NEET-PG:** * **Gonioscopy Findings:** Angle recession is diagnosed by seeing a widened ciliary body band. * **Angle Recession Glaucoma:** It is a secondary open-angle glaucoma. It may occur years after the initial trauma. * **Vossius Ring:** A circular ring of pigment on the anterior lens capsule (another sign of blunt trauma). * **Rule of Thumb:** If more than **180 degrees** of the angle is involved, there is a high risk of developing late-onset glaucoma. Regular intraocular pressure (IOP) monitoring is mandatory for these patients.

Question 14: What is the most common cause of diplopia in orbital fracture?

A. Edema and hemorrhage in and around extraocular muscles. (Correct Answer)
B. Detachment of muscle insertion or origin.
C. Injury to the nerve supplying the muscle.
D. Entrapment of muscle in a fractured segment.

Explanation: ### Explanation **1. Why Option A is Correct:** In the acute phase of an orbital fracture (especially blow-out fractures), the most common cause of diplopia is **edema and hemorrhage** within the orbital fat and extraocular muscles. This leads to mechanical restriction and "pseudo-entrapment," where the swelling prevents the muscle from gliding smoothly. This is often transient and resolves as the inflammation subsides, which is why surgeons typically wait 1–2 weeks for the swelling to resolve before reassessing the need for surgery. **2. Why Other Options are Incorrect:** * **Option B (Detachment):** This is extremely rare in blunt orbital trauma. Extraocular muscles are robustly attached to the globe and the annulus of Zinn; fractures usually involve the thin orbital floor or medial wall rather than the muscle anchors. * **Option C (Nerve Injury):** While the infraorbital nerve is frequently injured (causing malar anesthesia), direct motor nerve palsy to the extraocular muscles is uncommon in isolated orbital floor fractures. * **Option D (Entrapment):** While "true" entrapment of the muscle or periorbital tissue in the fracture line is a classic board-exam concept, it is **not** the most common cause. It is, however, the most serious cause, often requiring urgent surgical intervention (especially in "trapdoor" fractures in children). **3. NEET-PG High-Yield Pearls:** * **Most common site of blow-out fracture:** Orbital floor (specifically the thin bone medial to the infraorbital canal). * **Second most common site:** Medial wall (lamina papyracea). * **"White-eyed blowout fracture":** Seen in children; presents with severe restriction of gaze and systemic symptoms (nausea/vomiting) due to the **oculocardiac reflex**, despite a lack of external redness or swelling. This is a surgical emergency. * **Investigation of Choice:** Non-contrast CT (NCCT) of the orbits with coronal views.

Question 15: Commotio retinae is defined as which of the following?

A. Edema of the cornea following blunt trauma.
B. Edema of the retina following blunt trauma. (Correct Answer)
C. Injury to the anterior part of the lens.
D. Injury to the sclera.

Explanation: **Explanation:** **Commotio Retinae** (also known as **Berlin’s Edema** when it involves the macula) is a common consequence of blunt ocular trauma. The underlying pathophysiology involves a coup or contrecoup injury that leads to the disruption of the outer retinal layers (specifically the photoreceptor outer segments and the retinal pigment epithelium). This manifests clinically as a transient, opalescent, milky-white discoloration of the retina. * **Why Option B is correct:** Commotio retinae is defined as a post-traumatic opacification of the retina. While often referred to as "edema," histopathology shows it is actually caused by the fragmentation of photoreceptors and intracellular fluid accumulation rather than true extracellular edema. * **Why Option A is incorrect:** Edema of the cornea following trauma is typically referred to as corneal hydrops (if chronic/structural) or simply traumatic corneal edema, often due to endothelial dysfunction. * **Why Option C is incorrect:** Injury to the lens following blunt trauma usually results in a "Vossius ring" (pigment on the anterior capsule) or a traumatic cataract (Rosette-shaped). * **Why Option D is incorrect:** Injury to the sclera is termed a scleral laceration or rupture. **High-Yield Clinical Pearls for NEET-PG:** * **Berlin’s Edema:** Specifically refers to commotio retinae involving the **macula**. It may present with a "Cherry Red Spot" due to the contrast between the white opacified retina and the underlying choroidal vasculature at the foveola. * **Prognosis:** Most cases resolve spontaneously within 1–2 weeks without specific treatment. However, permanent vision loss can occur if there is associated pigmentary degeneration or a macular hole. * **Visual Field:** Patients often present with a relative scotoma corresponding to the area of whitening.

Question 16: Sympathetic ophthalmitis is characterized by which of the following?

A. Lisch nodules
B. Busacca nodules
C. Koeppe nodules
D. Dalen-Fuchs nodules (Correct Answer)

Explanation: **Explanation:** **Sympathetic Ophthalmitis (SO)** is a rare, bilateral granulomatous panuveitis that occurs following a penetrating injury to one eye (the "exciting eye"), leading to inflammation in the fellow eye (the "sympathizing eye"). The underlying mechanism is a T-cell mediated autoimmune response against uveal antigens (melanin-associated antigens) that were previously sequestered. **Why Dalen-Fuchs Nodules are the Correct Answer:** Dalen-Fuchs nodules are the hallmark histopathological and clinical feature of SO. They are small, yellowish-white elevated lesions located between the **retinal pigment epithelium (RPE) and Bruch’s membrane**. They consist of collections of epithelioid cells, lymphocytes, and macrophages. **Analysis of Incorrect Options:** * **A. Lisch nodules:** These are melanocytic hamartomas of the iris, typically seen in **Neurofibromatosis Type 1**. * **B. Busacca nodules:** These are inflammatory granulomas located on the **iris surface** (away from the pupil). They are characteristic of granulomatous uveitis (e.g., Sarcoidosis, TB). * **C. Koeppe nodules:** These are inflammatory nodules located at the **pupillary margin**. Like Busacca nodules, they indicate granulomatous uveitis but are not specific to SO. **NEET-PG High-Yield Pearls:** * **Incidence:** Most cases occur within 2 weeks to 3 months after injury (rarely before 2 weeks). * **Clinical Sign:** The earliest sign is often a loss of accommodation or "mutton-fat" keratic precipitates (KPs). * **Prevention:** Evisceration does not prevent SO; **Enucleation** of the injured eye within 10–14 days of trauma is the traditional preventive measure if the eye has no visual potential. * **Imaging:** On Fluorescein Angiography (FFA), Dalen-Fuchs nodules appear as multiple "pinpoint" leaks (hot spots).

Question 17: Lisch nodule is seen in which of the following conditions?

A. Sympathetic Ophthalmitis
B. Neurofibromatosis (Correct Answer)
C. Chronic iridocyclitis
D. Trachoma

Explanation: **Explanation:** **Lisch nodules** are the most common ocular manifestation of **Neurofibromatosis Type 1 (NF-1)**, also known as von Recklinghausen disease. Pathologically, they are melanocytic hamartomas of the iris stroma. They appear as well-defined, dome-shaped, yellowish-brown elevations on the iris surface. They are highly diagnostic (part of the NIH diagnostic criteria for NF-1) and are present in over 95% of affected individuals by age 20. **Analysis of Incorrect Options:** * **Sympathetic Ophthalmitis:** This is a bilateral granulomatous panuveitis following penetrating trauma to one eye. The characteristic pathological finding here is **Dalen-Fuchs nodules** (subretinal nodules), not Lisch nodules. * **Chronic Iridocyclitis:** Chronic inflammation of the iris and ciliary body may lead to inflammatory nodules like **Koeppe nodules** (at the pupillary margin) or **Busacca nodules** (on the iris surface), but these are inflammatory, not hamartomatous. * **Trachoma:** This is a chronic keratoconjunctivitis caused by *Chlamydia trachomatis*. Characteristic findings include **Herbert’s pits** (limbal depressions) and **Arlt’s line** (conjunctival scarring), but it does not involve iris nodules. **High-Yield Clinical Pearls for NEET-PG:** * **NF-1 Diagnostic Criteria:** Lisch nodules (2 or more) are a major criterion. Other ocular signs include optic nerve gliomas and sphenoid wing dysplasia. * **NF-2:** Unlike NF-1, Lisch nodules are typically **absent** in NF-2. Instead, look for **PSC (Posterior Subcapsular Cataract)**. * **Differential Diagnosis of Iris Nodules:** * *Koeppe/Busacca:* Granulomatous Uveitis (e.g., Sarcoidosis, TB). * *Brushfield Spots:* Down Syndrome (Trisomy 21). * *Lisch Nodules:* NF-1.

Question 18: Which drug should be avoided in the management of traumatic hyphema in an individual of dark race?

A. Timolol
B. Acetazolamide (Correct Answer)
C. Atropine
D. Steroids

Explanation: **Explanation:** The correct answer is **Acetazolamide**. **Why Acetazolamide is avoided:** In individuals of African or Mediterranean descent ("dark race"), there is a significantly higher prevalence of **Sickle Cell Trait or Disease**. In patients with sickle cell hemoglobinopathy, Acetazolamide (a carbonic anhydrase inhibitor) increases the acidity of the aqueous humor and promotes systemic dehydration. This acidic environment induces the **sickling of red blood cells** within the anterior chamber. These rigid, sickle-shaped cells cannot easily pass through the trabecular meshwork, leading to severe secondary glaucoma and an increased risk of central retinal artery occlusion (CRAO) due to elevated intraocular pressure (IOP). **Analysis of Incorrect Options:** * **A. Timolol:** This is a topical beta-blocker and is generally the first-line agent to reduce IOP in traumatic hyphema as it does not affect sickling. * **C. Atropine:** Cycloplegics are indicated in hyphema to provide comfort (by relieving ciliary spasm) and to prevent posterior synechiae. * **D. Steroids:** Topical steroids are used to reduce secondary inflammation and decrease the risk of secondary re-bleeding by stabilizing the clot. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Rule:** Always screen for Sickle Cell Disease in patients of dark race presenting with traumatic hyphema before starting treatment. * **Alternative for IOP:** If IOP is elevated in a sickle cell patient, use **Methazolamide** (less effect on pH) or topical aqueous suppressants like Timolol or Brimonidine. * **The "8-Ball Hyphema":** Refers to a total hyphema where the blood appears black/purplish; it carries a high risk of corneal blood staining and secondary glaucoma. * **Re-bleeding:** Typically occurs between **day 2 and day 5** post-injury and is often more severe than the initial bleed.

Question 19: Which of the following conditions can occur due to blunt trauma of the eye?

A. Berlin's edema
B. Angle recession
C. Sympathetic ophthalmitis (Correct Answer)
D. Rosette cataract

Explanation: **Explanation:** The question asks which condition can occur due to blunt trauma. While all four options are associated with ocular trauma, **Sympathetic Ophthalmitis (SO)** is traditionally associated with **penetrating injuries** involving the uveal tissue, rather than pure blunt trauma. However, in the context of many standard PG entrance exams, this question often appears as a "Multiple Correct Option" type or requires identifying the most serious complication. *Note: There appears to be a discrepancy in the provided key. Berlin’s edema, Angle recession, and Rosette cataract are classic hallmarks of **blunt (non-penetrating) trauma**, whereas Sympathetic Ophthalmitis typically follows **penetrating trauma**.* **1. Why the Options relate to Trauma:** * **Berlin’s Edema (Commotio Retinae):** A classic result of blunt trauma causing milky-white opasification of the retina (usually at the macula) due to disruption of photoreceptors. * **Angle Recession:** Blunt trauma causes a tear between the longitudinal and circular muscles of the ciliary body. It is a leading cause of secondary glaucoma years after the injury. * **Rosette Cataract:** A pathognomonic sign of blunt trauma where star-shaped opacities form along the lens sutures. * **Sympathetic Ophthalmitis (Correct per key):** This is a rare, bilateral granulomatous panuveitis. It occurs when a penetrating injury to one eye (the "exciting eye") leads to an autoimmune attack on the uninjured eye (the "sympathizing eye") due to the release of sequestered uveal antigens. **2. High-Yield Clinical Pearls for NEET-PG:** * **Vossius Ring:** A ring of pigment on the anterior lens capsule, pathognomonic for blunt trauma. * **Angle Recession Glaucoma:** Always perform gonioscopy in cases of blunt trauma (after the acute phase) to rule out this condition. * **Sympathetic Ophthalmitis Prevention:** If a severely injured eye has no visual potential, it should be enucleated within **2 weeks** to prevent SO in the other eye. * **Dalen-Fuchs Nodules:** Small, yellow-white spots seen histologically in Sympathetic Ophthalmitis.

Question 20: What is true about Vossius's ring?

A. It is a ring around the optic nerve.
B. It is synonymous with Soemmering's ring.
C. It is an impression of a miotic pupil on the lens. (Correct Answer)
D. It is an impression of a dilated pupil on the lens.

Explanation: **Explanation:** **Vossius’s Ring** is a classic sign of **blunt ocular trauma** (concussion injury). It occurs when a sudden force strikes the eye, causing the iris to be forcefully pushed backward against the anterior capsule of the crystalline lens. This results in the deposition of brown iris pigment in a circular pattern on the lens surface. 1. **Why Option C is correct:** The ring corresponds to the diameter of the pupil at the moment of impact. Since the iris is compressed against the lens, it leaves a circular pigmentary impression. It is specifically associated with a **miotic (constricted) or mid-dilated pupil** rather than a fully dilated one. 2. **Why other options are incorrect:** * **Option A:** A ring around the optic nerve refers to peripapillary atrophy or a scleral crescent, which is unrelated to trauma. * **Option B:** **Soemmering’s Ring** is a post-operative complication of cataract surgery where lens fibers proliferate in the peripheral capsular bag; it is not traumatic pigment deposition. * **Option D:** In blunt trauma, the pupil is typically not in a state of maximal mydriasis at the instant of impact; the ring reflects the pupillary margin's contact area. **High-Yield Clinical Pearls for NEET-PG:** * **Location:** It is found on the **Anterior Capsule** of the lens. * **Visual Impact:** It usually does not affect visual acuity and may disappear over time. * **Associated Signs of Blunt Trauma:** Look for **Rosette-shaped cataracts** (late sign), Iridodialysis (iris tearing from the ciliary body), and Angle recession (leading to secondary glaucoma). * **Differential:** Do not confuse with **Kayser-Fleischer (KF) ring** (copper in cornea) or **Fleischer ring** (iron in keratoconus).

Practice by Chapter

Classification of Ocular Trauma

Practice Questions

Blunt Trauma

Practice Questions

Penetrating and Perforating Injuries

Practice Questions

Intraocular Foreign Bodies

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Chemical Injuries

Practice Questions

Thermal and Radiation Injuries

Practice Questions

Orbital Trauma

Practice Questions

Traumatic Optic Neuropathy

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Ocular Manifestations of Child Abuse

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Sports-Related Eye Injuries

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Ocular Trauma Management Principles

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Rehabilitation After Ocular Trauma

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