Ocular Trauma — MCQs

Ocular Trauma Indian Medical PG Practice Questions and MCQs

Question 141: A 20 year old man complains of difficulty in reading the newspaper with his right eye, three weeks after sustaining a gun shot injury to his left eye. The most likely diagnosis is:

A. Optic nerve avulsion
B. Sympathetic ophthalmia (Correct Answer)
C. Delayed vitreous hemorrhage
D. Macular edema

Explanation: ***Sympathetic ophthalmia*** - This is a rare, bilateral **granulomatous uveitis** occurring after penetrating trauma or surgery to one eye, with symptoms typically appearing weeks to months later in the **contralateral eye**. - The delayed onset of visual difficulty in the uninjured right eye, following **gunshot injury** to the left eye three weeks prior, strongly points to an autoimmune reaction affecting both eyes. *Optic nerve avulsion* - This injury involves the complete or partial tearing of the **optic nerve** from the back of the globe, usually due to direct trauma to the eye. - Symptoms would be immediate and severe vision loss in the **injured eye**, not delayed vision loss in the contralateral eye. *Delayed vitreous hemorrhage* - A delayed **vitreous hemorrhage** would cause sudden vision loss in the **injured eye** due to blood obscuring the visual axis. - It would not explain the vision loss in the **contralateral, uninjured eye**. *Macular edema* - **Macular edema** can cause blurred or distorted vision, but it is typically a localized phenomenon, often resulting from inflammation, diabetes, or vascular occlusion. - It would affect the **injured eye** as a direct consequence of trauma, not the contralateral eye in a delayed fashion and with the specific clinicopathological features of sympathetic ophthalmia.

Question 142: All are ocular emergencies except

A. Diabetic Retinopathy (Correct Answer)
B. Bacterial endophthalmitis
C. Sympathetic ophthalmitis
D. Eye injury

Explanation: ***Diabetic Retinopathy*** - While diabetic retinopathy is a serious condition that can lead to vision loss, it is a **chronic progressive disease** that usually does not demand immediate emergency intervention. - Its progression is often slow, and even severe forms like **proliferative diabetic retinopathy** or **diabetic macular edema** are typically treated in an **urgent but not emergent** time frame. - Patients can be managed on an outpatient basis with scheduled treatments. *Bacterial endophthalmitis* - This is an **acute intraocular infection** that constitutes a true ophthalmic emergency. - Can rapidly lead to severe and **irreversible vision loss within 24-48 hours** if not treated immediately. - Requires emergency treatment with **intravitreal antibiotics** and often vitrectomy to preserve vision. *Sympathetic ophthalmia* - This is a rare, bilateral **granulomatous panuveitis** that occurs as a delayed complication (usually **2 weeks to several months**) after penetrating trauma or intraocular surgery. - While not an acute emergency at onset, once diagnosed it requires **prompt aggressive immunosuppressive therapy** (corticosteroids, immunomodulators) to prevent bilateral vision loss. - In the context of acute presentations, the **initial penetrating eye injury** itself is the emergency, not the sympathetic ophthalmia which develops later. *Eye injury* - **Ocular trauma** constitutes a true ophthalmic emergency, especially penetrating injuries, chemical burns, globe rupture, or traumatic hyphema. - Requires **immediate medical and often surgical intervention** to prevent further damage, infection, or permanent vision loss. - Timing of treatment is critical and measured in hours.

Question 143: Vossius ring is seen in -

A. Nuclear cataract
B. Congenital rubella
C. Blunt trauma (Correct Answer)
D. Wilson's disease
E. Posterior subcapsular cataract

Explanation: ***Blunt trauma*** - A **Vossius ring** is a precisely circular deposit of pigment on the anterior lens capsule, corresponding to the pupillary margin at the time of injury. - It is a classic sign of **blunt ocular trauma**, where the iris is slammed against the anterior lens surface, leaving a pigmented imprint. *Nuclear cataract* - **Nuclear cataracts** involve the central nucleus of the lens and are primarily associated with the aging process. - They are characterized by **yellowish-brown discoloration** and hardening of the lens nucleus, not pigment deposition from trauma. *Congenital rubella* - **Congenital rubella syndrome** can cause cataracts, but these are typically **pearly nuclear cataracts** or diffuse lens opacities, not a Vossius ring. - Other ocular manifestations include **microphthalmia** and pigmentary retinopathy. *Wilson's disease* - **Wilson's disease** is characterized by copper deposition in various tissues, including the eye. - The classic ocular finding is a **Kayser-Fleischer ring**, which is a greenish-brown copper deposit in the peripheral cornea, not a Vossius ring on the lens. *Posterior subcapsular cataract* - **Posterior subcapsular cataracts** form at the back of the lens, just beneath the capsule. - They are often associated with steroid use, diabetes, or inflammation, and cause glare and difficulty with reading, but do not present as a Vossius ring.

Question 144: Vossius ring is seen in

A. Blunt trauma (Correct Answer)
B. Hypertensive retinopathy
C. Diabetic retinopathy
D. After cataract

Explanation: ***Blunt trauma*** - A **Vossius ring** is a deposition of iris pigment on the anterior lens capsule, forming a circular or semi-circular ring. - It typically occurs as a result of **blunt trauma** to the globe, where the iris impacts the lens and leaves a pigment imprint. *Hypertensive retinopathy* - **Hypertensive retinopathy** is characterized by changes in the retinal blood vessels due to high blood pressure, such as arteriolar narrowing, hemorrhages, and exudates. - It does not involve pigment deposition on the lens capsule. *Diabetics* - **Diabetic retinopathy** is a complication of diabetes affecting the retina, leading to microaneurysms, hemorrhages, and neovascularization. - It is not associated with the formation of a Vossius ring. *After cataract* - An **after-cataract**, or posterior capsule opacification, is a common complication after cataract surgery where the posterior lens capsule becomes cloudy. - This condition occurs due to proliferation of residual lens epithelial cells and is not related to pigment deposition from blunt trauma.

Question 145: True about acid injury to eye are all except?

A. more destructive than alkali injuries (Correct Answer)
B. steroids are used to control inflammation
C. makes a barrier and prevent deeper penetration
D. glaucoma is most preventable complication following acid injury

Explanation: ***more destructive than alkali injuries*** - This statement is **false**. **Alkali burns** are generally more severe than acid burns because alkalis have **liquefactive necrosis**, which allows them to penetrate deeper into ocular tissues. - Acids cause **coagulative necrosis**, which forms a protective barrier that limits further penetration, making them typically less destructive than alkali injuries. *steroids are used to control inflammation* - **Topical corticosteroids** are commonly used in the management of ocular chemical burns, including acid injuries, to help **control inflammation** and reduce the risk of secondary complications. - However, their use must be carefully monitored due to potential side effects like increased intraocular pressure and delayed corneal healing. *makes a barrier and prevent deeper penetration* - **Acidic substances** cause **coagulative necrosis** of the superficial tissues, which creates a protective barrier of denatured proteins. - This barrier helps to prevent the acid from penetrating deeper into the ocular structures, thus often limiting the extent of damage compared to alkali burns. *glaucoma is most preventable complication following acid injury* - **Glaucoma** is indeed a significant complication of ocular acid injuries and can be prevented through **immediate copious irrigation**, control of inflammation, and monitoring of intraocular pressure. - While various complications can occur (corneal opacification, symblepharon, limbal stem cell deficiency), glaucoma prevention through early intervention and appropriate medical management is a key focus in acute management, making this statement acceptable as true.

Question 146: The most serious alkali burns of the eye are produced by

A. Lime
B. Liquid ammonia (Correct Answer)
C. Caustic soda
D. None of the options

Explanation: ***Liquid ammonia*** - **Liquid ammonia** produces the most severe alkali burns due to its small molecular size, which allows for rapid and deep penetration into ocular tissues. - Its high lipid solubility facilitates passage through cell membranes, leading to extensive tissue damage, including to the **cornea**, **lens**, and **ciliary body**. *Lime* - While **lime (calcium hydroxide)** causes significant alkali burns, its larger molecular size and lower lipid solubility limit its penetration compared to ammonia. - It often forms precipitates in superficial tissues, which can be mechanically removed, making its long-term effects less severe than ammonia. *Caustic soda* - **Caustic soda (sodium hydroxide)** is a strong alkali, causing severe burns by liquefaction necrosis. - However, its molecular characteristics and penetration depth are generally less extreme than that of liquid ammonia, resulting in slightly less severe damage. *None of the options* - This option is incorrect because **liquid ammonia** is indeed known to cause the most serious alkali burns of the eye due to its unique chemical properties.

Question 147: Which ocular injury is most likely to result in traumatic hyphema?

A. Penetrating injury
B. Blunt trauma (Correct Answer)
C. Chemical burn
D. Radiation injury

Explanation: ***Blunt trauma*** - **Blunt trauma** to the globe is the most common cause of **traumatic hyphema**, as the force can disrupt the anterior chamber's vascular structures. - The impact can lead to a sudden increase in **intraocular pressure**, shearing delicate blood vessels, particularly those of the **iris** and **ciliary body**. *Penetrating injury* - While a penetrating injury can cause bleeding, the primary concern is usually the **integrity of the globe** and introduction of infection, rather than massive accumulation of blood in the anterior chamber. - The nature of the injury often leads to external leakage or damage to different ocular structures, making **hyphema** less direct or severe compared to blunt force. *Chemical burn* - Chemical burns primarily cause **tissue necrosis**, inflammation, and potentially scarring of the conjunctiva, cornea, and internal structures. - While severe burns can lead to vascular compromise, they do not typically cause the immediate, significant intraocular hemorrhage seen with blunt trauma. *Radiation injury* - **Radiation injury** to the eye typically results in delayed effects such as **cataracts**, **retinopathy**, or **optic neuropathy** due to cellular damage over time. - It does not cause acute rupture of blood vessels leading to immediate **hyphema** as its mechanism of injury is fundamentally different.

Question 148: A 40-year-old male presents with a history of blunt trauma to the eye. Examination reveals a deep anterior chamber and iris transillumination defects. What is the most likely diagnosis?

A. Angle-recession glaucoma (Correct Answer)
B. Hyphema
C. Retinal detachment
D. Commotio retinae

Explanation: ***Angle-recession glaucoma*** - Following blunt trauma, the combination of a **deep anterior chamber** and **iris transillumination defects** suggests significant anterior segment damage consistent with angle recession. - The blunt trauma causes a tear in the **ciliary body** (between longitudinal and circular muscle fibers) and damage to the **trabecular meshwork**, resulting in a **deep anterior chamber** due to posterior displacement of the iris root. - **Iris transillumination defects** in this context indicate concurrent **traumatic iris sphincter damage** or tears, which commonly occur alongside angle recession in severe blunt ocular trauma. - Angle recession can lead to **secondary glaucoma** in approximately 5-10% of cases, often developing months to years after the initial injury due to impaired aqueous outflow. *Hyphema* - A **hyphema** is a collection of blood in the anterior chamber following trauma, presenting as a visible layered blood level (not iris transillumination defects). - While blunt trauma is a common cause, hyphema is an **acute presentation** with obvious blood in the anterior chamber, whereas the findings described suggest chronic post-traumatic changes. *Retinal detachment* - **Retinal detachment** typically presents with **photopsias** (flashes), **floaters**, and a **visual field defect** (curtain or shadow). - This is a **posterior segment** finding and does not explain anterior chamber depth changes or iris transillumination defects, which are anterior segment signs. *Commotio retinae* - **Commotio retinae** (Berlin's edema) is retinal whitening due to **outer retinal disruption** after blunt trauma, typically in the posterior pole or periphery. - This affects the **posterior segment** only and does not involve anterior chamber depth changes or iris structural damage.

Question 149: The most important initial management for traumatic hyphema is:

A. Surgical evacuation
B. Topical corticosteroids
C. Cycloplegic drops
D. Bed rest with head elevation (Correct Answer)

Explanation: ***Bed rest with head elevation*** - **Bed rest with head elevation (30-45°)** is the **cornerstone of initial conservative management** for traumatic hyphema. - This allows the blood to settle inferiorly by gravity, facilitates reabsorption, and significantly **reduces the risk of rebleeding** (which occurs in 15-20% of cases, typically on days 3-5). - It minimizes sudden eye movements and fluctuations in intraocular pressure that could dislodge the clot, making it the **most important initial step**. *Cycloplegic drops* - Cycloplegic drops (e.g., atropine, cyclopentolate) are important **adjunctive medical therapy** that paralyze the ciliary muscle and dilate the pupil. - They reduce pain from ciliary spasm and prevent posterior synechiae formation, promoting rest and healing of inflamed structures. - While essential, they are part of the medical management protocol rather than the primary initial intervention. *Topical corticosteroids* - Topical corticosteroids help reduce inflammation in the anterior chamber after trauma. - They are commonly used in the treatment regimen but are secondary to the fundamental conservative measures. - Their role is to control inflammation rather than prevent the most serious complication (rebleeding). *Surgical evacuation* - Surgical evacuation is **reserved for complications** such as persistent elevated IOP unresponsive to medical therapy, corneal blood staining, or total hyphema lasting >5-7 days. - It carries surgical risks and is never the initial treatment approach. - Medical and conservative management are always attempted first.

Question 150: A 25-year-old male presents with a penetrating eye injury caused by a metal fragment. What is the initial management step?

A. Immediate surgical removal
B. Application of eye ointment
C. Pressure patching
D. Shielding the eye and urgent referral (Correct Answer)

Explanation: ***Shielding the eye and urgent referral*** - The primary goal for a **penetrating eye injury** is to protect the globe from further damage and prevent expulsion of intraocular contents. This is achieved by placing a **rigid eye shield** (e.g., Fox shield, plastic cup) over the affected eye without applying pressure. - Urgent referral to an ophthalmologist is crucial for definitive management, including surgical repair, as soon as possible. *Immediate surgical removal* - **Immediate surgical removal** of the foreign body is indicated only in specific situations, such as large, easy-to-remove superficial fragments, or in the operating room. - Attempting removal outside a controlled surgical environment risks exacerbating the injury and causing further damage. *Application of eye ointment* - **Eye ointments** are contraindicated in penetrating eye injuries as they can enter the globe, act as a foreign body, and complicate surgical repair. - Furthermore, applying any pressure during the application could increase intraocular pressure and lead to extrusion of ocular contents. *Pressure patching* - **Pressure patching** is contraindicated in penetrating eye injuries because applying pressure to the globe can lead to increased intraocular pressure and expulsion of intraocular contents. - A rigid eye shield should be used instead to protect the eye without applying pressure.

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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