Ocular Trauma Practice Questions

Q: Global rupture due to blunt trauma is indicated by which of the following findings?

Contusion with hemorrhage and low intraocular pressure. **Explanation:** **Global Rupture** occurs when blunt trauma causes a sudden increase in intraocular pressure (IOP), leading to a full-thickness breach of the sclera or cornea. This is most common at the thinnest parts of the eye, such as the **limbus** or the **insertion sites of the extraocular muscles**. 1. **Why Option C is Correct:** A ruptured globe leads to the leakage of aqueous or vitreous humor, resulting in **hypotony (low intraocular pressure)**. Clinically, this presents with a "soft eye." The presence of extensive subconjunctival hemorrhage (often 360 degrees) and chemosis frequently masks the underlying scleral tear. Therefore, the combination of blunt trauma, severe hemorrhage, and low IOP is a classic diagnostic triad for global rupture. 2. **Why Other Options are Incorrect:** * **Option A (Blow-out fracture):** This involves a fracture of the orbital floor (most common) or medial wall. While it results from blunt trauma, it is an orbital injury, not a rupture of the globe itself. * **Option B (Lens subluxation):** This indicates damage to the zonules (zonular dialysis) but the globe remains intact. It is a sign of severe contusion, not necessarily rupture. * **Option C (Proptosis and decreased mobility):** These findings are more characteristic of an **orbital floor fracture** (due to muscle entrapment) or a **retrobulbar hemorrhage**, rather than a direct rupture of the eyeball. **High-Yield Clinical Pearls for NEET-PG:** * **Seidel’s Test:** Used to detect aqueous leakage (positive in globe rupture/perforation). * **Management:** If rupture is suspected, **stop** all examinations (do not check IOP with applanation), apply a rigid eye shield, and prepare for immediate surgical repair. * **Most common site of rupture:** The **superonasal quadrant** near the limbus is the most frequent site for indirect global rupture.

Q: Blow out orbit is characterized by:

All of the above. A **Blow-out fracture** occurs when blunt trauma to the orbit (e.g., by a tennis ball or fist) increases intraorbital pressure, causing the thin orbital floor (maxillary bone) to fracture while the orbital rim remains intact. ### **Explanation of Options:** * **Diplopia (Double Vision):** This occurs primarily due to the entrapment of the **inferior rectus muscle** and associated orbital fat within the fracture site. This limits the upward gaze of the affected eye, leading to binocular diplopia. * **Tear Drop Sign:** This is a classic radiological finding on a Water’s view X-ray or CT scan. It represents the herniation of orbital contents (fat and muscle) into the **maxillary sinus**, appearing as a "tear drop" hanging from the orbital floor. * **Positive Forced Duction Test (FDT):** FDT is used to differentiate between muscle paralysis and mechanical entrapment. In blow-out fractures, the eye cannot be rotated passively by the surgeon because the muscle is physically trapped in the bone, resulting in a **positive** test. Since all three clinical and radiological features are hallmark signs of this condition, **Option D** is the correct answer. ### **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Orbital floor (Maxillary bone), specifically medial to the infraorbital canal. * **Second most common site:** Medial wall (Ethmoid bone/Lamina papyracea). * **Nerve involved:** Infraorbital nerve (leading to anesthesia of the cheek and upper gum). * **Enophthalmos:** Sunken eye appearance due to increased orbital volume (usually manifests after edema subsides). * **Black Eyebrow Sign:** Presence of air in the orbit (orbital emphysema) from the paranasal sinuses.

Q: Blunt injury to the eye often causes all of the following, EXCEPT:

Avulsion of optic nerve. **Explanation:** The correct answer is **D. Avulsion of optic nerve**. While optic nerve avulsion can occur in trauma, it is typically the result of **severe, high-velocity decelerating injuries** or extreme rotation/displacement of the globe (e.g., a finger poke or a heavy object striking the orbit). It is **not** a common or "often" seen feature of standard blunt ocular trauma compared to the other options. **Why the other options are common features of blunt trauma:** * **Angle Recession (A):** This is a hallmark of blunt trauma. The sudden rise in intraocular pressure 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. * **Anterior Polar Cataract (B):** Blunt trauma can cause various lenticular changes. While "Vossius ring" is the most classic sign, localized opacities like anterior or posterior subcapsular (rosette) cataracts are frequently observed due to the shockwave (coup/contrecoup) effect. * **Berlin Edema (C):** Also known as *Commotio Retinae*, this is a very common finding. It represents transient retinal opacification (milky white appearance) at the macula due to extracellular edema and photoreceptor disruption following a blunt blow. **NEET-PG High-Yield Pearls:** 1. **Vossius Ring:** A circular ring of iris pigment on the anterior lens capsule; a pathognomonic sign of blunt trauma. 2. **Rosette Cataract:** The classic "star-shaped" or "flower-shaped" posterior subcapsular opacity seen in contusion injuries. 3. **Angle Recession:** Diagnosed via **Gonioscopy**; look for a widened ciliary body band. 4. **Hyphema:** Blood in the anterior chamber, a common immediate complication of blunt trauma due to iris vessel rupture.

Question 1

Global rupture due to blunt trauma is indicated by which of the following findings?

Accepted Answer

Contusion with hemorrhage and low intraocular pressure

Answer

Blow out fracture

Answer

Lens subluxation

Answer

Proptosis and decreased mobility of extraocular muscles

Question 2

Blow out orbit is characterized by:

Accepted Answer

All of the above

Answer

Diplopia

Answer

Tear drop sign

Answer

Positive forced duction test

Question 3

A 28-year-old male playing cricket sustains a direct blow to the head, resulting in a fracture of the orbit and damage to the optic canal. Which of the following structures are most likely to be damaged?

Accepted Answer

Optic nerve and ophthalmic artery

Answer

Ophthalmic vein and oculomotor artery

Answer

Ophthalmic artery and olfactory nerve

Answer

Ophthalmic nerve and optic nerve

Question 4

Blunt injury to the eye often causes all of the following, EXCEPT:

Accepted Answer

Avulsion of optic nerve

Answer

Angle recession

Answer

Anterior polar cataract

Answer

Berlin edema

Question 5

What is the most common foreign body to cause a penetrating injury to the ciliary body?

Accepted Answer

Hammer and chisel

Answer

Ball

Answer

Gun bullet

Answer

Vegetative material

Ocular Trauma — MCQs

Ocular Trauma — MCQs

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