Ocular Trauma Practice Questions

Q: A baby sustained blunt trauma to the eye with a ball. Finding seen in the picture is:

Hyphema. ***Hyphema*** Defined as the **accumulation of blood** in the **anterior chamber** of the eye, typically resulting from blunt trauma that causes a tear in the **ciliary body** or iris vasculature. Initial management involves **bed rest**, elevating the head to allow the blood to settle, and topical **corticosteroids** or cycloplegics to reduce inflammation and pain. *Hypopyon* This refers to the presence of **leukocytes** (pus) in the anterior chamber, representing an **inflammatory exudate** rather than hemorrhage. It is commonly associated with **infectious keratitis** or **endophthalmitis**, not trauma-induced bleeding. *Iridodialysis* This condition involves the **detachment of the iris** from the **scleral spur** at the root of the iris. While also caused by blunt trauma, it appears as a **D-shaped pupil** or a peripheral crescent-shaped defect, not blood pooling in the chamber. *Traumatic cataract* Characterized by opacification of the **crystalline lens** following trauma, often manifesting as a **rosette-shaped cataract**. The primary finding is a **lens opacity** affecting vision, which is distinct from the opaque, layered pooling of blood seen in hyphema.

Q: A patient presents with a history of chemical injury to the eye. Based on the image shown, what is the most likely diagnosis?

Symblepharon. ***Symblepharon*** - This condition represents a **fibrous adhesion** between the bulbar conjunctiva and the palpebral conjunctiva, often occurring as a long-term complication of severe **chemical burns**. - It results from the inflammatory destruction of the **conjunctival epithelium**, causing raw surfaces to adhere during the healing process. *Ankyloblepharon* - This refers to the **abnormal fusion** of the upper and lower eyelid margins, often occurring congenitally or following severe trauma. - It is distinct from symblepharon because it involves the closure of the **palpebral fissure** itself, rather than adhesion between the eyeball and eyelid. *Entropion* - Characterized by the **inward turning** of the eyelid margin, causing eyelashes to rub against the cornea. - While chemical injuries can cause scarring leading to cicatricial entropion, it describes the **malposition** of the lid margin rather than a direct adhesion between the conjunctival layers. *Trichiasis* - This describes the **misdirection** of eyelashes toward the eyeball, which often rubs against the cornea and causes irritation. - It is a common secondary consequence of eyelid inflammation or scarring, but it defines the **aberrant growth angle** of individual cilia rather than a symblepharon adhesion.

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.

Q: What is the first investigation to be done in hyphema?

Tonometry. **Explanation:** **Hyphema** refers to the presence of blood in the anterior chamber, usually following blunt ocular trauma. The most critical immediate complication of hyphema is a sudden rise in **Intraocular Pressure (IOP)**. **Why Tonometry is the first investigation:** In the acute phase of hyphema, red blood cells (RBCs) and fibrin can clog the trabecular meshwork, leading to **secondary glaucoma**. Elevated IOP can cause permanent optic nerve damage and, more importantly, increases the risk of **corneal blood staining**, which can lead to permanent loss of corneal clarity. Therefore, measuring IOP via tonometry is the priority to determine if immediate pressure-lowering treatment is required. Non-contact tonometry or Tono-Pen is often preferred to avoid pressure on the globe if a rupture is suspected. **Analysis of Incorrect Options:** * **Slit lamp examination:** While essential for grading the hyphema and checking for associated injuries, it is a diagnostic tool for visualization rather than the immediate physiological assessment required to prevent vision loss from pressure. * **B-scan:** This is indicated only if the hyphema is total ("8-ball hyphema") and the posterior segment cannot be visualized. It is not the *first* investigation. * **Funduscopy:** Often difficult in the presence of blood in the anterior chamber. It is performed later to rule out retinal tears or commotio retinae once the media clears. **Clinical Pearls for NEET-PG:** * **Grading:** Grade I ( 35 mmHg for 7 days or >50 mmHg for 5 days to prevent corneal blood staining.

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

Sympathetic ophthalmitis. **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.

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

Tear of the ciliary body. **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 1

A baby sustained blunt trauma to the eye with a ball. Finding seen in the picture is:

Accepted Answer

Hyphema

Answer

Hypopyon

Answer

Iridodialysis

Answer

Traumatic cataract

Question 2

A patient presents with a history of chemical injury to the eye. Based on the image shown, what is the most likely diagnosis?

Accepted Answer

Symblepharon

Answer

Ankyloblepharon

Answer

Entropion

Answer

Trichiasis

Question 3

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 4

Blow out orbit is characterized by:

Accepted Answer

All of the above

Answer

Diplopia

Answer

Tear drop sign

Answer

Positive forced duction test

Question 5

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 6

What is the first investigation to be done in hyphema?

Accepted Answer

Tonometry

Answer

Slit lamp examination

Answer

B scan

Answer

Funduscopy

Question 7

Which of the following features of panophthalmitis differentiates it from endophthalmitis?

Accepted Answer

Presence of pus in the anterior chamber

Answer

Proptosis

Answer

Limited and painful ocular movements

Answer

Complete loss of vision

Question 8

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

Accepted Answer

Sympathetic ophthalmitis

Answer

Chronic iridocyclitis

Answer

Neurofibromatosis

Answer

Trachoma

Question 9

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

Accepted Answer

Enophthalmos

Answer

Exophthalmos

Answer

Bulbar hemorrhage

Answer

None of the above

Question 10

Blunt injury to the eye causes recession of the angle of the eye because of?

Accepted Answer

Tear of the ciliary body

Answer

Schlemm canal split

Answer

Trabecular meshwork split

Answer

Dislocation of the lens

Ocular Trauma — MCQs

Ocular Trauma — MCQs

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