Ocular Trauma — MCQs

Ocular Trauma Indian Medical PG Practice Questions and MCQs

Question 91: Which of the following statements regarding secondary cataract is FALSE?

A. A true rosette is seen after blunt trauma to the eye. (Correct Answer)
B. The Vossius ring is smaller than the pupil.
C. Berlin's edema is post-traumatic macular edema.
D. A rosette cataract is a posterior conical cataract.

Explanation: **Explanation:** The question asks for the **FALSE** statement regarding secondary changes following ocular trauma. **1. Why Option A is False (The Correct Answer):** A **true rosette cataract** is typically a late-stage manifestation of **penetrating trauma**, not blunt trauma. Blunt trauma usually results in a **traumatic rosette cataract**, which is an early, transient, or permanent opacification occurring along the lens suture lines. The distinction lies in the mechanism: blunt trauma causes concussive forces that disrupt lens fibers, whereas true rosettes are associated with direct injury. **2. Analysis of Other Options:** * **Option B (Vossius Ring):** This is a circular ring of pigment deposited on the anterior lens capsule following blunt trauma. It is formed when the iris is forcibly pressed against the lens. It is characteristically **smaller than the pupil** because it corresponds to the pupillary margin at the moment of impact. * **Option C (Berlin’s Edema):** Also known as *Commotio Retinae*, this is a milky-white opacification of the retina (macula) following blunt trauma. It is caused by extracellular edema and disruption of the photoreceptor outer segments. * **Option D (Rosette Cataract):** A traumatic rosette cataract is indeed a **posterior cortical (conical) cataract**. It typically forms in the subcapsular region, often at the posterior pole, following the star-shaped pattern of the lens sutures. **High-Yield Clinical Pearls for NEET-PG:** * **Vossius Ring:** Pathognomonic sign of previous blunt trauma. * **Sunflower Cataract:** Associated with **Chalcosis** (copper foreign body). * **Snowflake Cataract:** Associated with **Diabetes Mellitus**. * **Christmas Tree Cataract:** Associated with **Myotonic Dystrophy**. * **Berlin’s Edema:** Shows a "Cherry Red Spot" appearance due to the contrast between the white edematous retina and the reddish fovea.

Question 92: Infra-red rays causes which of the following conditions?

A. Cataract (Correct Answer)
B. Keratitis
C. Optic neuritis
D. Glaucoma

Explanation: **Explanation:** The correct answer is **Cataract**. **1. Why Cataract is Correct:** Infra-red (IR) radiation is a form of thermal energy. When the eye is chronically exposed to IR rays, the energy is absorbed by the iris and converted into heat. This heat is transferred to the lens epithelium, leading to protein denaturation and opacification. This specific type of cataract is known as **"Glass-blower’s cataract"** or **"Furnace-worker’s cataract."** A characteristic clinical feature is **true exfoliation** of the anterior lens capsule, where the superficial layer of the capsule peels off like a scroll. **2. Why Other Options are Incorrect:** * **Keratitis:** This is most commonly caused by **Ultraviolet (UV) rays** (specifically UV-B), leading to "Photokeratitis" or "Snow blindness." IR rays do not typically cause primary keratitis. * **Optic Neuritis:** This is an inflammatory or demyelinating condition of the optic nerve (e.g., Multiple Sclerosis) and is not related to thermal or radiation injury from IR rays. * **Glaucoma:** While trauma can cause secondary glaucoma, IR radiation does not have a direct causative link to the development of primary glaucoma. **3. High-Yield Clinical Pearls for NEET-PG:** * **Glass-blower’s Cataract:** Associated with IR rays; features **true exfoliation** of the lens capsule. * **Snow Blindness/Photokeratitis:** Associated with **UV rays** (UV-B, 290-320 nm); presents with severe pain and photophobia after a latent period. * **Eclipse Retinopathy (Solar Retinitis):** Caused by photochemical damage to the fovea from viewing a solar eclipse; primarily due to short-wavelength visible light and some IR. * **Ionizing Radiation (X-rays/Gamma rays):** Typically causes **Posterior Subcapsular Cataract (PSC)**.

Question 93: A penetrating iron particle is lodged in the eye. Which of the following investigations will NOT be used for its localization?

A. X-ray
B. CT scan
C. MRI (Correct Answer)
D. USG

Explanation: **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**.

Question 94: Blunt injury to the eye often causes all of the following complications EXCEPT:

A. Choroidal rupture
B. Iridodialysis
C. Avulsion of optic nerve
D. None of the above (Correct Answer)

Explanation: **Explanation:** Blunt trauma to the eye causes rapid anteroposterior compression and compensatory equatorial expansion. This sudden change in intraocular pressure and mechanical stretching can lead to various structural damages across all segments of the eye. **Why "None of the above" is correct:** All three listed conditions—Choroidal rupture, Iridodialysis, and Avulsion of the optic nerve—are well-recognized complications of blunt ocular trauma. Therefore, none of them can be excluded. **Analysis of Options:** * **Choroidal Rupture (A):** Occurs due to the relative inelasticity of the Bruch’s membrane compared to the overlying retina. It typically presents as a crescent-shaped streak concentric to the optic disc. * **Iridodialysis (B):** This refers to the tearing of the iris root from the ciliary body. It is a classic sign of blunt trauma and often results in a "D-shaped" pupil and monocular diplopia. * **Avulsion of the Optic Nerve (C):** This is a severe complication where the optic nerve is forcibly pulled out of the globe at the lamina cribrosa. It occurs during extreme rotation or sudden displacement of the globe. **High-Yield Clinical Pearls for NEET-PG:** * **Vossius Ring:** A ring of iris pigment on the anterior lens capsule, pathognomonic for blunt trauma. * **Angle Recession:** Tearing of the ciliary muscle (between longitudinal and circular fibers); it is the most common cause of traumatic glaucoma. * **Berlin’s Edema (Commotio Retinae):** A milky-white cloudiness of the retina (usually at the macula) due to extracellular edema following blunt injury. * **Rosette Cataract:** The characteristic shape of a cataract formed after blunt trauma.

Question 95: Bett's classification deals with what?

A. Ocular trauma (Correct Answer)
B. Ocular foreign body
C. Squint
D. Maculopathy

Explanation: **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.

Question 96: The Jones test is used to detect which of the following?

A. Nasolacrimal duct block (Correct Answer)
B. Glaucoma
C. Vitreous opacities
D. Retinal detachment

Explanation: **Explanation:** The **Jones Dye Test** is a clinical diagnostic procedure used to evaluate the patency and functional efficiency of the lacrimal drainage system. It is specifically indicated in patients presenting with epiphora (overflow of tears) where the anatomical passages appear open on syringing, but a functional blockage is suspected. * **Jones Test I (Primary):** Fluorescein dye is instilled into the conjunctival sac. After 5 minutes, a cotton bud is inserted into the inferior meatus of the nose. If dye is recovered, the system is patent (Positive test). If no dye is recovered, it indicates a **nasolacrimal duct block** or pump failure (Negative test). * **Jones Test II (Secondary):** Performed only if Test I is negative. Residual dye is washed out, and clear saline is syringed into the punctum. If stained saline is recovered from the nose, it indicates the dye reached the sac but failed to pass into the nose (partial distal block). **Why other options are incorrect:** * **Glaucoma:** Diagnosed via Tonometry (IOP), Gonioscopy (angle), and Perimetry (visual fields). * **Vitreous opacities:** Detected using Slit-lamp biomicroscopy or B-scan ultrasonography. * **Retinal detachment:** Diagnosed via Indirect Ophthalmoscopy or B-scan USG. **High-Yield Clinical Pearls for NEET-PG:** 1. **Schirmer’s Test:** Used to measure tear production (Dry Eye). 2. **Anel’s Test:** Lacrimal syringing to check anatomical patency. 3. **Dacryocystography (DCG):** The gold standard imaging for anatomical site of obstruction. 4. **Dacryocystorhinostomy (DCR):** The surgical treatment of choice for chronic dacryocystitis/NLD block.

Question 97: What is the first sign of sympathetic ophthalmitis?

A. Presence of keratic precipitates (KPs) (Correct Answer)
B. Ciliary congestion
C. Tenderness of the globe
D. Disc edema

Explanation: **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.

Question 98: Blow out injury with ptosis occurs due to damage to?

A. Zygomatic arch
B. Orbital floor (Correct Answer)
C. Sphenoid bone
D. Palatine and maxillary bones

Explanation: **Explanation:** A **blow-out fracture** occurs when a blunt object (larger than the orbital rim, like a tennis ball or fist) strikes the orbit, causing a sudden increase in intraorbital pressure. This pressure is transmitted to the weakest parts of the orbital walls, leading to a fracture. **Why the Orbital Floor is correct:** The **orbital floor** (primarily the maxillary bone) is the most common site for a blow-out fracture because it is thin and lacks support. Damage here can lead to: * **Enophthalmos:** Herniation of orbital contents into the maxillary sinus. * **Diplopia:** Entrapment of the inferior rectus muscle. * **Ptosis:** In this context, "pseudoptosis" occurs because the eyeball sinks downward and backward (enophthalmos), causing the upper eyelid to droop. True ptosis can also occur if there is associated nerve damage or levator palpebrae superioris injury. **Analysis of Incorrect Options:** * **A. Zygomatic arch:** Fractures here typically involve the lateral cheek and do not cause the classic "blow-out" mechanism or herniation of orbital contents. * **C. Sphenoid bone:** This forms the posterior orbit and the optic canal. Damage here is associated with orbital apex syndrome or optic nerve injury, not typical blow-out symptoms. * **D. Palatine and maxillary bones:** While the maxillary bone is involved in the floor, the palatine bone forms only a tiny posterior portion. The "floor" is the specific anatomical term for this clinical entity. **High-Yield Clinical Pearls for NEET-PG:** * **Weakest part of the orbit:** Lamina papyracea (medial wall), but the **floor** is the most common site for clinical blow-out fractures. * **Nerve involved:** Infraorbital nerve (leads to anesthesia of the cheek and upper gum). * **Teardrop Sign:** Seen on a Water’s view X-ray, representing herniated orbital fat/muscle in the maxillary sinus. * **Black Eyebrow Sign:** Presence of intraorbital air (emphysema) from the paranasal sinuses.

Question 99: 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?

A. Iris vessels
B. Circulus iridis major (Correct Answer)
C. Circulus iridis minor
D. Short posterior ciliary vessels

Explanation: **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.

Question 100: Berlin's edema occurs due to which type of ocular injury?

A. Penetrating injury to the eye
B. Blunt trauma to the eye (Correct Answer)
C. Radiation injury to the eye
D. Chemical injury to the eye

Explanation: **Explanation:** **Berlin’s Edema (Commotio Retinae)** is a classic manifestation of **blunt trauma** to the eye. When a blunt object strikes the globe, the resulting coup or contrecoup force causes a rapid deformation of the eyeball. This mechanical shock leads to the fragmentation of the photoreceptor outer segments and damage to the retinal pigment epithelium (RPE). Clinically, this presents as a **milky-white opacification** of the retina, most commonly involving the posterior pole (macula). The "edema" is actually an intracellular phenomenon rather than extracellular fluid accumulation. If the fovea is involved, a **"Cherry Red Spot"** may be visible because the thin foveola allows the underlying vascular choroid to shine through the surrounding opaque retina. **Analysis of Incorrect Options:** * **A. Penetrating injury:** These typically result in globe rupture, intraocular foreign bodies, or endophthalmitis rather than the specific diffuse opacification seen in Berlin’s edema. * **C. Radiation injury:** This leads to radiation retinopathy, characterized by microaneurysms, cotton wool spots, and telangiectasia, usually appearing months to years after exposure. * **D. Chemical injury:** These primarily affect the anterior segment (cornea and conjunctiva), causing limbal ischemia or corneal melting. **High-Yield Clinical Pearls for NEET-PG:** * **Prognosis:** Most cases of Berlin’s edema resolve spontaneously within 1–2 weeks without treatment. * **Vision:** If the macula is spared, vision remains normal; if involved, there is a sudden decrease in central vision. * **Histopathology:** The white appearance is due to the **disruption of photoreceptor outer segments**, not true fluid edema. * **Differential Diagnosis:** Always differentiate from Central Retinal Artery Occlusion (CRAO), which also presents with a cherry red spot but lacks a history of trauma.

Practice by Chapter

Classification of Ocular Trauma

Practice Questions

Blunt Trauma

Practice Questions

Penetrating and Perforating Injuries

Practice Questions

Intraocular Foreign Bodies

Practice Questions

Chemical Injuries

Practice Questions

Thermal and Radiation Injuries

Practice Questions

Orbital Trauma

Practice Questions

Traumatic Optic Neuropathy

Practice Questions

Ocular Manifestations of Child Abuse

Practice Questions

Sports-Related Eye Injuries

Practice Questions

Ocular Trauma Management Principles

Practice Questions

Rehabilitation After Ocular Trauma

Practice Questions

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