Ocular Trauma — MCQs

Ocular Trauma Indian Medical PG Practice Questions and MCQs

Question 151: What is the most common cause of sympathetic ophthalmia?

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

Explanation: **Penetrating injury to the eye** - **Sympathetic ophthalmia** is a rare, bilateral granulomatous inflammation that occurs after a **penetrating ocular injury** to one eye. - The injury to the affected eye (the **exciting eye**) exposes intraocular antigens to the immune system, leading to an autoimmune response that affects both eyes. *Blunt ocular trauma* - While blunt trauma can cause significant ocular damage, it typically does not expose the intraocular antigens necessary to trigger **sympathetic ophthalmia**. - **Blunt trauma** often leads to conditions like hyphema, orbital fractures, or commotio retinae, but not generalized autoimmune inflammation of both eyes. *Chemical injury to the eye* - **Chemical injuries** primarily cause damage to the ocular surface and anterior segment structures through direct tissue necrosis. - This type of injury rarely leads to the exposure of deep intraocular antigens required to initiate an autoimmune response like that seen in sympathetic ophthalmia. *Retinal detachment* - **Retinal detachment** is the separation of the neurosensory retina from the underlying retinal pigment epithelium. - Although it is a serious ocular condition, it is not a typical prerequisite for **sympathetic ophthalmia** as it generally does not involve a penetrating wound that exposes uveal tissue.

Question 152: Which condition is characterized by a pupil that appears in a 'D' shape?

A. Open-angle glaucoma
B. Lens dislocation
C. Iridodialysis (Correct Answer)
D. Anterior uveitis

Explanation: ***Iridodialysis*** - An **iridodialysis** is a separation of the iris from its attachment at the ciliary body, creating a peripheral defect that can cause the pupil to appear D-shaped or pear-shaped. - This condition often results from **blunt trauma** to the eye. *Open-angle glaucoma* - **Open-angle glaucoma** is characterized by gradual vision loss due to optic nerve damage, typically with no initial symptoms or changes in pupil shape. - The pupil generally remains **round and reactive** in open-angle glaucoma, and the condition is diagnosed by elevated intraocular pressure and characteristic optic nerve changes. *Lens dislocation* - A **dislocated lens** might cause changes in visual acuity or diplopia, but it does not directly alter the shape of the pupil. - Pupillary abnormalities associated with lens dislocation are usually related to a **tremulous iris** (iridodonesis) or secondary glaucoma, not a D-shaped pupil. *Anterior uveitis* - **Anterior uveitis** causes inflammation of the iris and ciliary body, leading to symptoms like pain, photophobia, and redness. - While uveitis can cause pupillary irregularities due to **posterior synechiae** (adhesions between the iris and the lens), it does not typically result in a D-shaped pupil.

Question 153: Prerequisite for sympathetic ophthalmia

A. Blunt ocular trauma
B. Chemical eye injury
C. Severe conjunctivitis
D. Penetrating ocular injury (Correct Answer)

Explanation: ***Penetrating ocular injury*** - Sympathetic ophthalmia is a rare, **bilateral diffuse granulomatous uveitis** occurring after a **penetrating ocular injury** or **intraocular surgery** in one eye (the exciting eye). - The injury exposes the uveal pigment antigens to the immune system, leading to a delayed hypersensitivity reaction. *Blunt ocular trauma* - While blunt trauma can cause significant eye damage, it typically does not involve the **penetration of the globe**, which is a prerequisite for sympathetic ophthalmia. - The immune system is less likely to be exposed to intraocular antigens in a way that triggers this specific autoimmune response. *Chemical eye injury* - Chemical injuries primarily cause **surface damage** and inflammation, potentially leading to corneal scarring or glaucoma. - They do not typically involve the breach of the globe that allows for the exposure of uveal tissue necessary for sympathetic ophthalmia. *Severe conjunctivitis* - Conjunctivitis is an inflammation of the **conjunctiva**, the outer membrane of the eye, and does not involve the internal structures of the eye. - It poses no risk for sympathetic ophthalmia, as there is no disruption of the globe to expose uveal tissue.

Question 154: In which of the following conditions does Berlin's edema occur?

A. Open angle glaucoma
B. After cataract surgery
C. After concussional trauma (Correct Answer)
D. Diabetic retinopathy

Explanation: ***After concussional trauma*** - **Berlin's edema**, also known as **commotio retinae**, is a form of **retinal edema** that occurs following **blunt trauma** to the eye. - It results from the disruption of the **photoreceptor outer segments** and retinal pigment epithelium, leading to a **dull, gray-white appearance** of the retina. *Open angle glaucoma* - Characterized by **progressive optic nerve damage** and visual field loss, typically due to elevated intraocular pressure, without retinal edema. - The primary pathology involves the **trabecular meshwork**, not direct retinal swelling. *After cataract surgery* - A common complication is **cystoid macular edema** (Irvine-Gass syndrome), which affects the macula and can cause blurred vision. - This is distinct from Berlin's edema, as it is a **post-surgical inflammatory response**, not a direct traumatic injury. *Diabetic retinopathy* - Involves various retinal changes due to diabetes, such as **microaneurysms**, hemorrhages, and **macular edema** from leaky vessels. - It is a **metabolic and vascular disease**, not a direct consequence of acute ocular trauma.

Question 155: All of the following are complications of traumatic hyphema except which of the following?

A. Pupillary Block
B. Posterior synechiae
C. Rebleeding
D. Corneal Ulcer (Correct Answer)

Explanation: ***Corneal Ulcer*** - A **corneal ulcer** is typically caused by infection, trauma, or exposure keratitis and is not a direct complication of blood in the anterior chamber from a **traumatic hyphema**. - While prolonged elevation of **intraocular pressure** from hyphema could theoretically impair corneal health, a direct ulcer is not a typical or primary complication. *Rebleeding* - **Rebleeding** is a common and serious complication of hyphema, usually occurring 2-7 days after the initial injury. - It often results in a more significant bleed and carries a higher risk of complications such as **elevated intraocular pressure** and **blood staining of the cornea**. *Pupillary Block* - **Pupillary block** can occur if the amount of blood from the hyphema prevents the flow of aqueous humor from the posterior to the anterior chamber. - This blockage leads to a buildup of **aqueous humor** in the posterior chamber, causing the iris to bow forward and potentially precipitating **acute angle-closure glaucoma**. *Posterior synechiae* - **Posterior synechiae** can develop due to inflammation (uveitis) associated with the hyphema, where the iris adheres to the anterior lens capsule. - This complication can lead to **irregular pupil shape**, **pupillary block glaucoma**, or other visual disturbances.

Question 156: Rosette cataract is seen due to:

A. Hyperparathyroidism
B. Copper foreign body
C. Trauma (Correct Answer)
D. Diabetes

Explanation: ***Trauma*** - A **rosette cataract** is a classic sign of **blunt or penetrating ocular trauma**, where the force disrupts the lens fibers, leading to a characteristic star-shaped opacity. - The trauma causes a rapid swelling and opacification of the lens, often in the anterior or posterior subcapsular regions in a flower-petal or stellar pattern. *Copper foreign body* - A **copper foreign body** typically causes a **chalcosis lentis**, characterized by a **sunflower cataract** (deposits in the anterior capsule) due to copper deposition. - This is distinct from a rosette cataract, which forms due to the mechanical disruption of lens integrity rather than elemental deposition. *Diabetes* - **Diabetic cataracts** are typically either **"snowflake" cataracts** (rapidly progressive in younger patients with uncontrolled diabetes) or more commonly **age-related cataracts** that progress faster in diabetic patients. - These are metabolically induced cataracts, not presenting with the characteristic rosette or star-shaped pattern associated with trauma. *Hyperparathyroidism* - **Hyperparathyroidism** can lead to **metabolic cataracts** due to chronic hypercalcemia, which can cause calcium deposition within the lens. - These cataracts are typically described as **punctate cortical or subcapsular opacities**, rather than the distinct rosette shape seen after trauma.

Question 157: What is a potential ocular complication caused by alkali exposure?

A. Symblepharon (Correct Answer)
B. Papilloedema
C. Optic neuritis
D. Retinal detachment

Explanation: ***Symblepharon*** - **Symblepharon** is the **adhesion of the palpebral conjunctiva to the bulbar conjunctiva**. It is a common long-term complication of severe alkali burns to the eye, reflecting significant tissue damage and cicatrization. - Alkali causes **liquefactive necrosis**, deeply penetrating ocular tissues and leading to extensive inflammation, scarring, and subsequent adhesion formation due to the destruction of the conjunctival surface. *Papilloedema* - **Papilloedema** refers to **optic disc swelling due to increased intracranial pressure**, not a direct result of ocular surface trauma or chemical exposure. - While systemic conditions can cause papilloedema, it is unrelated to the local effects of an **alkali burn**. *Optic neuritis* - **Optic neuritis** is an **inflammation of the optic nerve**, often associated with demyelinating diseases like multiple sclerosis. - It results in **vision loss** and pain with eye movement but is not a complication of external ocular chemical burns. *Retinal detachment* - **Retinal detachment** occurs when the **retina separates from the underlying retinal pigment epithelium**, leading to significant vision loss. - This condition is typically caused by trauma, vitreous traction, or retinal tears, and is not a direct consequence of an **alkali burn to the anterior segment of the eye**.

Question 158: Irregular pupil is seen in which of the following conditions?

A. Glaucoma
B. Trauma (Correct Answer)
C. Retinal detachment
D. Oculomotor palsy

Explanation: ***Trauma*** - **Direct injury to the iris** can cause tears or distortion, leading to an **irregularly shaped pupil** - Results in conditions like **traumatic mydriasis** (dilated pupil) or **iridodialysis** (iris detachment from its root at the ciliary body) - **Sphincter pupillae tears** cause characteristic irregularity with notching or peaked appearance *Glaucoma* - Primarily characterized by **optic nerve damage** due to increased intraocular pressure - In acute angle closure glaucoma, pupil may be **mid-dilated and fixed**, but remains **round**, not irregular - Pupil shape irregularity is not a feature of chronic glaucoma *Retinal detachment* - Involves **separation of the neurosensory retina** from the underlying retinal pigment epithelium - This is a **posterior segment pathology** that does not affect anterior segment structures - **Pupil shape remains regular** despite severe vision loss *Oculomotor palsy* - Affects the **third cranial nerve (CN III)**, leading to ptosis, strabismus, and loss of parasympathetic innervation - Pupil is typically **dilated and fixed** due to unopposed sympathetic action - Pupil remains **round but unresponsive to light**, not irregular in shape

Question 159: A 20-year-old male presents with a history of a tennis ball injury to the right eye, and on examination, a red spot is seen at the macula. The most likely diagnosis is

A. Macular hole
B. Berlin's edema (Correct Answer)
C. Macular tear
D. Macular bleed

Explanation: ***Berlin's edema*** - **Berlin's edema**, also known as **commotio retinae**, is characterized by **retinal whitening** due to traumatic edema of the outer retinal layers, causing the classic **"cherry-red spot"** appearance at the fovea (the underlying choroidal vasculature shows through the relatively thinner foveal center, contrasting with the surrounding whitened edematous retina). - It typically occurs after **blunt trauma** to the eye, such as from a tennis ball injury. - This is the most likely diagnosis given the acute presentation of a "red spot" at the macula following blunt ocular trauma. *Macular hole* - A **macular hole** is a full-thickness defect in the fovea, typically presenting with **central vision loss** and **metamorphopsia** (distorted vision), not as an acute "red spot" after trauma. - While severe trauma can rarely cause macular holes, the immediate presentation of a red spot is more characteristic of commotio retinae. *Macular tear* - A **macular tear** implies a severe retinal disruption with potential for retinal detachment, causing sudden profound vision loss. - The ophthalmoscopic appearance would show retinal tissue disruption rather than the classic cherry-red spot seen in Berlin's edema. *Macular bleed* - A **macular hemorrhage** would appear as a dark red or reddish area due to extravasated blood, which could obscure underlying retinal details. - While blunt trauma can cause subretinal or intraretinal hemorrhage, the specific description of a "red spot" in the context of blunt trauma is more characteristic of the foveal appearance through surrounding retinal edema (Berlin's edema) rather than frank hemorrhage.

Question 160: What is the most common cause of traumatic hyphema in the anterior chamber?

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

Explanation: ***Blunt trauma to the eye*** - **Blunt trauma** to the eye is the most common cause of traumatic hyphema, resulting from a sudden increase in intraocular pressure that can tear iris or ciliary body vessels. - This type of injury often occurs during sports, fights, or accidents where an object impacts the eye without penetrating it. *Chemical injury to the eye* - Chemical injuries primarily cause damage to the **cornea, conjunctiva, and sclera** through chemical burns, leading to tissue necrosis. - While vision may be affected, **hyphema** is not a typical primary complication, although severe inflammation might indirectly lead to some bleeding. *Penetrating injury to the eye* - A **penetrating injury** certainly causes bleeding and hyphema, but it is a less common mechanism for *traumatic hyphema* overall compared to blunt force. - These injuries carry a higher risk of **endophthalmitis** and severe structural damage, often requiring immediate surgical repair. *Foreign body in the eye* - An intraocular **foreign body** can cause hyphema if it directly lacerates blood vessels within the anterior chamber. - However, the overall incidence of hyphema due to a foreign body is lower compared to non-penetrating blunt 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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