Ocular Trauma Practice Questions

Q: A penetrating iron particle is lodged in the eye. Which of the following investigations will NOT be used for its localization?

MRI. **Explanation:** The correct answer is **MRI (Option C)**. **1. Why MRI is Contraindicated:** The core concept here is **ferromagnetism**. Iron is a ferromagnetic material. An MRI uses a powerful magnetic field; if a patient with a retained intraocular iron foreign body (IOFB) undergoes an MRI, the magnetic force can cause the particle to shift, rotate, or vibrate. This movement can lead to devastating secondary intraocular damage, such as retinal tears, vitreous hemorrhage, or even globe perforation. Therefore, MRI is **strictly contraindicated** whenever a metallic foreign body is suspected. **2. Analysis of Other Options:** * **X-ray (Option A):** This is often the first-line screening tool. It is excellent for detecting radio-opaque metallic foreign bodies and can help localize them using specialized techniques like the **McGrigor’s** or **Sweet’s** localization methods. * **CT Scan (Option B):** Non-contrast CT (NCCT) of the orbit is the **gold standard** investigation for ocular trauma. It provides precise 3D localization, determines the size of the object, and detects associated fractures or air (pneumophthalmos) without moving the object. * **USG (Option D):** B-scan ultrasonography is highly useful for detecting IOFBs and assessing the status of the posterior segment (e.g., retinal detachment) when the media is opaque. However, it must be performed with extreme caution (or avoided) if an open globe injury is suspected to prevent extrusion of intraocular contents. **Clinical Pearls for NEET-PG:** * **Gold Standard for IOFB:** Non-contrast CT (NCCT) Orbits (using 1mm thin sections). * **Siderosis Bulbi:** A late complication of retained iron IOFB characterized by iron deposition in ocular tissues, leading to heterochromia iridis and "rust-colored" cataracts. * **ERG Finding:** In Siderosis Bulbi, the ERG initially shows an increased a-wave, but eventually, there is a **progressive diminution of the b-wave amplitude**.

Q: Bett's classification deals with what?

Ocular trauma. **Explanation:** The **Birmingham Eye Trauma Terminology (BETT)** system, developed by Kuhn et al., is the universally accepted standardized classification for **ocular trauma**. It provides a clear, unambiguous framework for describing mechanical eye injuries, ensuring consistent communication between clinicians and researchers. **Why Option A is correct:** BETT classifies eye injuries based on the status of the eyewall (sclera and cornea). It divides ocular trauma into two main categories: 1. **Closed Globe Injury:** The eyewall is intact (includes Contusions and Lamellar lacerations). 2. **Open Globe Injury:** There is a full-thickness wound of the eyewall (includes Ruptures and Lacerations). Lacerations are further subdivided into Penetrating, Perforating, and Intraocular Foreign Body (IOFB) injuries. **Why other options are incorrect:** * **B. Ocular foreign body:** While BETT includes IOFB as a sub-type of open globe injury, the classification itself deals with the broader spectrum of all mechanical ocular trauma. * **C. Squint:** Strabismus is classified based on the direction of deviation (Esotropia/Exotropia) or the nature of the deviation (Comitant/Incomitant), not by BETT. * **D. Maculopathy:** Macular diseases are classified by etiology (e.g., Age-related, Diabetic, or Solar) or anatomical changes (e.g., Cystoid Macular Edema). **High-Yield Clinical Pearls for NEET-PG:** * **Penetrating Injury:** Single entry wound (no exit). * **Perforating Injury:** Two full-thickness wounds (entry and exit) caused by the same agent. * **Rupture:** Caused by blunt trauma (inside-out mechanism) at the weakest point of the globe. * **Laceration:** Caused by a sharp object (outside-in mechanism) at the site of impact.

Q: What is the first sign of sympathetic ophthalmitis?

Presence of keratic precipitates (KPs). **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 uninjured eye (the "sympathizing eye"). **Why Option A is correct:** The **earliest clinical sign** of sympathetic ophthalmitis is the appearance of **fine, retrocorneal Keratic Precipitates (KPs)** on the endothelium of the sympathizing eye. These KPs are often associated with a "mutton-fat" appearance as the disease progresses, signifying its granulomatous nature. Additionally, a very early subjective symptom is a **decrease in the power of accommodation** (due to ciliary body involvement), but among the clinical signs listed, KPs are the hallmark initial finding. **Why the other options are incorrect:** * **B. Ciliary congestion:** While present in SO, it is a general sign of active uveitis and typically follows the initial cellular infiltration. * **C. Tenderness of the globe:** This is more characteristic of endophthalmitis or severe panophthalmitis rather than the early stages of SO. * **D. Disc edema:** This is a posterior segment sign (papillitis) that occurs as the inflammation spreads but is not the *first* sign detected on examination. **High-Yield Clinical Pearls for NEET-PG:** * **Exciting Eye:** The injured eye; **Sympathizing Eye:** The non-injured eye. * **Latent Period:** Usually 2 weeks to 3 months (90% occur within 1 year). It rarely occurs before 2 weeks. * **Pathognomonic Histology:** **Dalen-Fuchs Nodules** (clusters of epithelioid cells between the RPE and Bruch’s membrane). * **Prevention:** Evisceration/Enucleation of a severely injured eye with no visual potential within **2 weeks** of injury prevents SO. * **Treatment:** Long-term systemic corticosteroids and immunosuppressants.

Q: An 18-year-old boy presents to the eye casualty with a history of injury from a tennis ball. On examination, there is no perforation, but there is hyphaema. What is the most likely source of the blood?

Circulus iridis major. **Explanation:** Traumatic hyphaema (blood in the anterior chamber) following blunt trauma, such as a tennis ball injury, is most commonly caused by a **contusion deformity**. When the globe is compressed, there is a sudden increase in intraocular pressure and a posterior displacement of the iris-lens diaphragm. This force leads to a **ciliary body tear** (recession) or a tear at the **iris root (iridodialysis)**. **1. Why Circulus Iridis Major is Correct:** The **Circulus Iridis Major** (Major Arterial Circle of the Iris) is located in the ciliary stroma near the iris root. Because blunt trauma frequently causes shearing forces at the iris root and the anterior face of the ciliary body, this arterial circle is the most common source of significant bleeding in traumatic hyphaema. **2. Analysis of Incorrect Options:** * **Iris vessels (A):** While small iris vessels can bleed, they are rarely the primary source of a significant traumatic hyphaema compared to the major arterial circle. * **Circulus iridis minor (C):** This is an incomplete vascular circle located at the pupillary margin (collarette). It is less likely to be involved in the shearing injuries associated with blunt trauma. * **Short posterior ciliary vessels (D):** These vessels supply the choroid and the optic nerve head in the posterior segment. Injury to these would lead to vitreous or subretinal hemorrhage, not hyphaema. **High-Yield Clinical Pearls for NEET-PG:** * **Vossius Ring:** A circular ring of pigment on the anterior lens capsule, often seen after blunt trauma (imprint of the iris). * **Angle Recession:** The most common long-term complication of traumatic hyphaema, which can lead to secondary glaucoma years later. * **Management:** Bed rest with head elevation (30-45°) to allow blood to settle and prevent corneal blood staining. * **Re-bleeding:** Typically occurs between the 2nd and 5th day and is often more severe than the initial bleed.

Q: In blunt injury to the eye, which of the following changes is NOT seen?

Soft exudates. **Explanation:** The correct answer is **D. Soft exudates**. **Why Soft Exudates are NOT seen:** Soft exudates, also known as **Cotton Wool Spots**, are not a direct result of mechanical trauma. They represent micro-infarctions of the retinal nerve fiber layer caused by **arteriolar occlusion and ischemia**. They are hallmark features of systemic vascular diseases such as **Diabetic Retinopathy, Hypertension, or HIV retinopathy**, rather than blunt ocular trauma. **Analysis of Incorrect Options:** * **Macular Hole:** Blunt trauma causes a sudden anteroposterior compression and equatorial expansion of the globe. This leads to vitreoretinal traction or sub-foveal hemorrhage, which can result in a **traumatic macular hole**. * **Berlin’s Edema (Commotio Retinae):** This is a classic finding in blunt trauma. It involves coup or contrecoup injury leading to extracellular edema and disruption of the photoreceptor outer segments, appearing as a **milky-white opacification** of the retina (usually at the macula). * **Subluxation of Lens:** Blunt trauma can cause rupture of the **ciliary zonules**. If the zonular dehiscence is partial, it leads to subluxation (displacement) of the lens; if complete, it leads to dislocation. **Clinical Pearls for NEET-PG:** * **Vossius Ring:** A circular pigment deposit on the anterior lens capsule from the iris pupillary margin; a pathognomonic sign of blunt trauma. * **Angle Recession:** Tearing of the ciliary muscle fibers (between longitudinal and circular muscles), which is the most common cause of secondary glaucoma after blunt trauma. * **Rosette Cataract:** The characteristic shape of a traumatic cataract. * **Choroidal Rupture:** Typically appears as a crescent-shaped scar concentric to the optic disc.

Q: Which of the following is an inert foreign body when lodged in the eye?

Silver. **Explanation:** Intraocular foreign bodies (IOFBs) are classified based on their chemical reactivity into **inert** and **reactive** materials. **1. Why Silver is Correct:** Silver is considered an **inert** material. Inert substances do not undergo significant chemical reactions with ocular tissues and are generally well-tolerated for long periods without causing an intense inflammatory response. Other examples of inert materials include gold, platinum, glass, stone, and high-grade plastics. While silver can occasionally cause a localized deposition known as **argyrosis**, it does not typically trigger the sight-threatening destructive reactions seen with reactive metals. **2. Why the Other Options are Incorrect:** * **Copper (Option B):** Highly reactive. It causes **Chalcosis**, characterized by a severe inflammatory reaction or specific deposition in the Descemet’s membrane (Kayser-Fleischer ring-like), lens (Sunflower cataract), and vitreous. * **Iron (Option C):** Highly reactive. It undergoes oxidation leading to **Siderosis Bulbi**, which causes irreversible damage to the retina (RPE degeneration) and iris heterochromia. * **Nickel (Option A):** Considered a reactive metal that can trigger significant intraocular inflammation and allergic responses. **Clinical Pearls for NEET-PG:** * **Siderosis Bulbi:** Look for "Rust spots" on the lens and a "diminished b-wave" on ERG (earliest sign of toxicity). * **Chalcosis:** Pure copper (>85%) causes acute suppurative endophthalmitis; alloys with lower copper content cause chronic chalcosis. * **Vegetable Matter:** These are the most dangerous IOFBs as they carry a high risk of fulminant fungal endophthalmitis. * **Management:** MRI is strictly **contraindicated** if a metallic (ferromagnetic) IOFB is suspected; CT scan is the gold standard for localization.

Q: Which of the following is not a complication of ocular trauma?

Central serous retinopathy. ### Explanation The correct answer is **D. Central serous retinopathy (CSR)**. **Why CSR is the correct answer:** Central Serous Retinopathy (also known as CSCR) is an **idiopathic** condition characterized by a localized serous detachment of the neurosensory retina at the macula. Its primary pathophysiology involves hyperpermeability of the choriocapillaris and dysfunction of the Retinal Pigment Epithelium (RPE). The most significant risk factors are **Type A personality, stress, and exogenous steroid use**. It is not caused by mechanical trauma. **Why the other options are incorrect:** All other options are classic manifestations of **blunt ocular trauma**: * **Iridodialysis (A):** This is the traumatic separation of the iris root from the ciliary body. It typically results in a "D-shaped" pupil. * **Choroidal detachment (B):** Blunt trauma can cause a sudden decrease in intraocular pressure (hypotony) or rupture of ciliary vessels, leading to fluid or blood accumulation in the suprachoroidal space. * **Hyphaema (C):** This is the presence of blood in the anterior chamber, usually resulting from a tear in the anterior face of the ciliary body or iris vessels (angle recession) following blunt force. **NEET-PG Clinical Pearls:** * **Vossius Ring:** A circular ring of pigment on the anterior lens capsule following blunt trauma (pathognomonic). * **Berlin’s Edema (Commotio Retinae):** A milky-white appearance of the retina due to extracellular edema following trauma; if it involves the macula, a "cherry-red spot" may be seen. * **Angle Recession:** The most common cause of secondary glaucoma years after blunt trauma. * **CSR Management:** Most cases are self-limiting and resolve within 3–4 months; the first step is to discontinue any steroid therapy.

Question 1

A penetrating iron particle is lodged in the eye. Which of the following investigations will NOT be used for its localization?

Accepted Answer

MRI

Answer

X-ray

Answer

CT scan

Answer

USG

Question 2

Which of the following tissue deposits is called chalcosis?

Accepted Answer

Copper

Answer

Cadmium

Answer

Chromium

Answer

Aluminum

Question 3

Bett's classification deals with what?

Accepted Answer

Ocular trauma

Answer

Ocular foreign body

Answer

Squint

Answer

Maculopathy

Question 4

What is the first sign of sympathetic ophthalmitis?

Accepted Answer

Presence of keratic precipitates (KPs)

Answer

Ciliary congestion

Answer

Tenderness of the globe

Answer

Disc edema

Question 5

Blow out injury with ptosis occurs due to damage to?

Accepted Answer

Orbital floor

Answer

Zygomatic arch

Answer

Sphenoid bone

Answer

Palatine and maxillary bones

Question 6

An 18-year-old boy presents to the eye casualty with a history of injury from a tennis ball. On examination, there is no perforation, but there is hyphaema. What is the most likely source of the blood?

Accepted Answer

Circulus iridis major

Answer

Iris vessels

Answer

Circulus iridis minor

Answer

Short posterior ciliary vessels

Question 7

Ruptured globe is suspected if there is:

Accepted Answer

Chemosis, hemorrhage, decreased intraocular pressure

Answer

Proptosis

Answer

Subluxation of lens

Answer

Blow-out fracture

Question 8

In blunt injury to the eye, which of the following changes is NOT seen?

Accepted Answer

Soft exudates

Answer

Macular hole

Answer

Berlin's edema

Answer

Subluxation of lens

Question 9

Which of the following is an inert foreign body when lodged in the eye?

Accepted Answer

Silver

Answer

Nickel

Answer

Copper

Answer

Iron

Question 10

Which of the following is not a complication of ocular trauma?

Accepted Answer

Central serous retinopathy

Answer

Iridodialysis

Answer

Choroidal detachment

Answer

Hyphaema

Ocular Trauma — MCQs

Ocular Trauma — MCQs

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