Ocular Trauma Practice Questions

Q: A man injured his eye in an accident. After two weeks, his other eye developed minor signs of anterior uveitis. Histologic sections of the traumatized eye show Dalen-Fuchs nodules. What is the diagnosis?

Sympathetic ophthalmia. **Explanation:** The clinical presentation described is a classic case of **Sympathetic Ophthalmia (SO)**. This is a rare, bilateral granulomatous panuveitis that occurs following a penetrating injury to one eye (the "exciting eye"). After a latent period (typically 2 weeks to 3 months), the non-injured eye (the "sympathizing eye") develops inflammation. **Why Option A is Correct:** The diagnosis is confirmed by the presence of **Dalen-Fuchs nodules** on histology. These are pathognomonic clusters of epithelioid cells, macrophages, and pigment epithelium cells located between the retinal pigment epithelium (RPE) and Bruch’s membrane. The underlying mechanism is an autoimmune reaction against sequestered uveal antigens (Type IV hypersensitivity) triggered by the initial trauma. **Why Other Options are Incorrect:** * **B. Anterior Uveitis:** While the patient shows signs of anterior uveitis, this is merely a clinical finding, not the primary diagnosis. SO is a panuveitis involving the entire uveal tract. * **C. Eye Injury:** This is the inciting event (the cause), not the resulting pathological diagnosis. * **D. Glaucoma:** While secondary glaucoma can be a complication of chronic uveitis, it does not explain the bilateral involvement or the specific histological findings. **High-Yield Clinical Pearls for NEET-PG:** * **Trigger:** Penetrating injury involving the ciliary body (the "danger zone") or intraocular surgery (e.g., evisceration). * **Latent Period:** 65% occur within 2 weeks to 2 months; 90% occur within 1 year. * **Histology:** Diffuse non-necrotizing granulomatous inflammation of the uveal tract with **sparing of the choriocapillaris**. * **Prevention:** Enucleation of the injured (blind) eye within 10–14 days of injury can prevent SO. * **Treatment:** High-dose systemic steroids and immunosuppressants.

Q: Which of the following is true regarding a blowout fracture of the floor of the orbit?

Waters view is recommended.. A **blowout fracture** occurs when blunt trauma to the orbit increases intraorbital pressure, causing the thin orbital floor (primarily the maxillary bone) to fracture into the maxillary sinus. ### **Explanation of Options** * **A. Waters view is recommended (Correct):** The Waters view (occipitomental projection) is the traditional radiographic investigation of choice for visualizing the orbital floor and maxillary sinuses. It can reveal the characteristic **"Tear-drop sign,"** which represents herniated orbital fat and the inferior rectus muscle into the maxillary sinus. * **B. Proptosis is seen (Incorrect):** While initial edema may cause mild protrusion, the hallmark of a blowout fracture is **Enophthalmos** (sunken eye). This occurs due to the increased orbital volume and herniation of orbital contents into the sinus. * **C. Epistaxis is never seen (Incorrect):** Epistaxis is actually a common finding. The fracture involves the maxillary sinus, and blood can drain through the ostium into the nasal cavity. * **D. A double density sign is seen (Incorrect):** The "Double density sign" is a radiological feature of **Allergic Fungal Rhinosinusitis**, not orbital fractures. The characteristic sign for a blowout fracture on X-ray is the **Tear-drop sign**. ### **High-Yield Clinical Pearls for NEET-PG** * **Most common site:** The posteromedial part of the **orbital floor** (weakest part). * **Clinical Triad:** Diplopia (due to inferior rectus entrapment), Enophthalmos, and Infraorbital nerve anesthesia (hypesthesia of the cheek/upper lip). * **Gold Standard Investigation:** Non-contrast CT (NCCT) of the orbit with coronal sections. * **Management:** Initial conservative management (ice packs, antibiotics, nasal decongestants). Surgery is indicated if there is persistent diplopia or significant enophthalmos (>2mm).

Q: Clinical manifestations of chalcosis include all of the following except?

Greenish discolouration of iris. **Explanation:** **Chalcosis** refers to the specific intraocular tissue reaction caused by the retention of a copper-containing foreign body. The underlying pathophysiology involves the dissolution of copper and its subsequent deposition in basement membranes of ocular structures via electrolysis. **Why Option A is the correct answer:** In chalcosis, the iris typically undergoes a **reddish-brown** or **muddy** discoloration. **Greenish discoloration** of the iris is a classic feature of **Siderosis Bulbi** (iron toxicity), not chalcosis. This distinction is a frequent "trap" in postgraduate entrance exams. **Analysis of other options:** * **Sunflower Cataract (Option B):** This is the hallmark of chalcosis. Copper deposits in the lens capsule and subcapsular epithelium, forming a central disc with radiating petal-like spokes. * **Kayser-Fleischer (KF) Ring (Option C):** While famously associated with Wilson’s Disease, a KF ring (golden-brown/greenish pigment in the Descemet’s membrane) can also occur in ocular chalcosis due to exogenous copper deposition. * **Golden Plaque at Posterior Pole (Option D):** Copper particles have a high affinity for the internal limiting membrane of the retina, often manifesting as shiny, golden-yellow metallic plaques at the macula or posterior pole. **NEET-PG Clinical Pearls:** * **Siderosis (Iron):** Causes "Rusting" of tissues, Iris heterochromia (Greenish/Brown), and **Night blindness** (due to RPE toxicity). * **Chalcosis (Copper):** Pure copper (>85%) causes massive suppuration; Alloys (<85%) cause chalcosis. * **Key Triad for Chalcosis:** Sunflower cataract + KF Ring + Golden retinal plaques. * **Management:** Immediate surgical removal of the foreign body is indicated if it is causing active chalcosis.

Q: Rosette cataract is typically seen in which of the following conditions?

Blunt trauma. **Explanation:** **Rosette cataract** is a pathognomonic clinical sign of **blunt trauma** to the eye. When the globe is compressed along its anteroposterior axis, the mechanical shockwave travels through the lens, causing a disruption of the lens fibers. This typically occurs at the interface between the lens epithelium and the fibers, specifically along the suture lines. The resulting opacification follows the pattern of the lens sutures, creating a characteristic flower-shaped or "star-shaped" appearance, usually located in the **posterior subcapsular** region (though it can be anterior). **Analysis of Incorrect Options:** * **Diabetes mellitus:** Typically presents with "Snowflake cataracts" (subcapsular opacities) due to osmotic swelling caused by sorbitol accumulation. * **Galactosemia:** Characteristically presents with an "Oil droplet cataract" due to the accumulation of dulcitol (galactitol) in the lens. * **Congenital rubella:** Classically associated with a "Pearly white nuclear cataract" as the virus crosses the placenta and invades the embryonic lens. **High-Yield Clinical Pearls for NEET-PG:** * **Vossius Ring:** Another hallmark of blunt trauma; it is a circular ring of iris pigment deposited on the anterior lens capsule. * **Concussion Cataract:** Can be early (rosette-shaped) or late (discoid/cupuliform). * **Sunflower Cataract:** Seen in **Wilson’s disease** (copper deposition), not to be confused with the Rosette cataract of trauma. * **Christmas Tree Cataract:** Seen in **Myotonic dystrophy**.

Q: What is the most common site of globe rupture?

Limbus. **Explanation:** Globe rupture occurs due to blunt trauma that causes a sudden increase in intraocular pressure, leading to the eye bursting at its weakest points. **1. Why Limbus is the Correct Answer:** The **limbus** (corneoscleral junction) is the most common site of rupture because it represents a structural transition zone where the cornea and sclera meet. It is inherently thinner and structurally weaker than the rest of the sclera. Additionally, in eyes with previous ocular surgeries (like cataract surgery), the old surgical incision site at the limbus becomes the most vulnerable point for rupture. **2. Analysis of Incorrect Options:** * **Equator:** While the equator is a site of weakness (due to the thinning of the sclera where the rectus muscles insert), it is the second most common site, not the first. Ruptures here are often "posterior" and can be occult (hidden). * **Sclera:** The sclera is generally thick and tough. While ruptures can occur anywhere on the sclera, the generalized term is less specific than the limbus. The sclera is thickest at the posterior pole and thinnest at the insertion of rectus muscles. * **Near the pupil:** The iris and pupil are internal structures. While they can be damaged (iridodialysis or traumatic mydriasis), they are not sites of "globe rupture," which refers to the integrity of the outer fibrous tunic. **Clinical Pearls for NEET-PG:** * **Indirect Rupture:** Usually occurs at the limbus, opposite the site of impact (contrecoup effect). * **Direct Rupture:** Occurs at the immediate site of impact. * **Management:** A suspected globe rupture is a surgical emergency. **Never** check intraocular pressure (IOP) or perform a thorough palpation if rupture is suspected, as this can cause extrusion of intraocular contents. Apply a rigid eye shield and refer for immediate primary repair.

Question 1

In siderosis bulbi, where are the electrolytically dissociated iron ions deposited?

Accepted Answer

Combined with intraocular proteins, producing degenerative changes

Answer

Under the membranous structures of the eye

Answer

At the site of deposition, producing a local irritative reaction

Answer

All of the above

Question 2

A "blow-out" fracture of the orbit most commonly involves which of the following walls?

Accepted Answer

Floor and lateral wall

Answer

Floor and medial wall

Answer

Floor

Answer

Floor and roof

Question 3

A man injured his eye in an accident. After two weeks, his other eye developed minor signs of anterior uveitis. Histologic sections of the traumatized eye show Dalen-Fuchs nodules. What is the diagnosis?

Accepted Answer

Sympathetic ophthalmia

Answer

Anterior uveitis

Answer

Eye injury

Answer

Glaucoma

Question 4

Which of the following is true regarding a blowout fracture of the floor of the orbit?

Accepted Answer

Waters view is recommended.

Answer

Proptosis is seen.

Answer

Epistaxis is never seen.

Answer

A double density sign is seen.

Question 5

In chalcosis bulbi, where are the electrolytically dissociated ions of copper deposited?

Accepted Answer

Under the membraneous structures of the eye

Answer

Combined with intracellular proteins, producing degenerative changes

Answer

Producing an irritative reaction at the local site

Answer

All of the above

Question 6

Clinical manifestations of chalcosis include all of the following except?

Accepted Answer

Greenish discolouration of iris

Answer

Sunflower cataract

Answer

Kayser-Fleischer ring

Answer

Deposition of golden plaque at the posterior pole of the retina

Question 7

Rosette cataract is typically seen in which of the following conditions?

Accepted Answer

Blunt trauma

Answer

Diabetes mellitus

Answer

Galactosemia

Answer

Congenital rubella infection

Question 8

Which metal is least likely to cause severe intraocular inflammation when present as a foreign body in the eye?

Accepted Answer

Silver

Answer

Nickel

Answer

Copper

Answer

Iron

Question 9

What is the most common site of globe rupture?

Accepted Answer

Limbus

Answer

Equator

Answer

Sclera

Answer

Near the pupil

Question 10

Prolapsed iris in perforating trauma should preferably be abscised and not reposited to prevent what?

Accepted Answer

Infection

Answer

Post-traumatic iridocyclitis

Answer

Sympathetic ophthalmitis

Answer

All of the above

Ocular Trauma — MCQs

Ocular Trauma — MCQs

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