Ocular Trauma Practice Questions

Q: Which of the following intraocular foreign bodies causes severe toxicity and needs to be removed promptly?

Copper. ***Copper*** - **Copper foreign bodies** cause **chalcosis bulbi**, a severe toxic reaction characterized by: - **Greenish discoloration** of anterior lens capsule and cornea - **Retinal degeneration** and pigmentary changes - **Vision loss** if not removed promptly - **Pure copper is highly toxic** and mandates immediate surgical removal to prevent irreversible ocular damage *Aluminium* - **Aluminum foreign bodies** are **inert** and well-tolerated in the eye - Generally do not cause significant inflammatory reactions or toxicity - Removal not required unless causing mechanical complications *Chromium* - **Chromium foreign bodies** are **inert** and non-toxic - Do not cause significant inflammation or tissue damage - Removal typically not necessary unless mechanically disruptive *Nickel* - **Nickel foreign bodies** are **relatively inert** within the eye - Rarely cause toxic reactions or significant inflammation - Removal usually not required unless causing mechanical irritation

Q: Most common cause of hyphema due to Blunt trauma

Major arterial circle. ***Major arterial circle*** - The **major arterial circle** of the iris is formed by anastomoses of the long posterior ciliary arteries and anterior ciliary arteries. - This vascular structure is located at the **iris root**, a vulnerable area prone to tearing and hemorrhage upon blunt trauma. *Conjunctival vessels* - Conjunctival vessels are located on the surface of the eye and, while they can bleed (causing a **subconjunctival hemorrhage**), this blood remains superficial and does not enter the anterior chamber to cause hyphema. - Subconjunctival hemorrhage presents as a distinct red patch on the sclera, unlike the layering of blood in the anterior chamber seen in hyphema. *Minor arterial circle* - The minor arterial circle is located within the iris stroma, closer to the pupillary margin, and is less robust than the major arterial circle. - While it can contribute to bleeding, it is less commonly the primary source of significant hyphema following blunt trauma compared to the larger vessels at the iris root. *Choroidal veins* - Choroidal veins are located in the choroid layer, posterior to the retina, and are not directly involved in anterior chamber hemorrhage. - Bleeding from the choroid typically results in **suprachoroidal hemorrhage** or retinal detachment, not hyphema in the anterior chamber.

Q: Most serious injury to the eye is caused by:

Lime. ***Lime*** - **Lime (calcium hydroxide)** is an **alkali** that causes **liquefactive necrosis** of ocular tissues, leading to deep penetration and severe, progressive damage. - Alkaline burns saponify cell membranes, resulting in continuous tissue destruction and potentially **corneal opacification**, **limbal ischemia**, and **perforation**. *Nitric acid* - **Nitric acid** is a strong acid that causes **coagulation necrosis**, which tends to create a protective barrier on the tissue. - While serious, this barrier often limits deeper penetration and tissue destruction compared to alkalis. *Hydrochloric acid* - **Hydrochloric acid** is also a strong acid and causes **coagulation necrosis**, similar to nitric acid. - This type of injury typically results in superficial damage to the eye, as the denatured proteins form a physical barrier. *Sulphuric acid* - **Sulphuric acid**, another strong acid, also primarily causes **coagulation necrosis**. - Although it can dehydrate tissues and cause significant superficial damage, its effect is generally less severe and penetrating than strong alkalis.

Q: Four months after a blast injury, a middle aged man developed siderosis bulbi. It is due to:

Iron. ***Iron*** - **Siderosis bulbi** is caused by the deposition of **iron** within the ocular tissues, often resulting from a retained **iron-containing intraocular foreign body**. - The iron ions leak from the foreign body, causing damage to the retina, iris, and lens, eventually leading to vision loss and potentially glaucoma. *Gold* - **Gold** deposition in ocular tissues is known as **chrysiasis**, typically seen in patients undergoing prolonged gold therapy for conditions like rheumatoid arthritis. - It usually manifests as fine, golden deposits in the **cornea** and **lens**, which are generally asymptomatic and do not cause siderosis bulbi. *Copper* - **Copper** deposition in the eye is known as **chalcosis bulbi**, which can result from retained **copper-containing intraocular foreign bodies** or systemic conditions like **Wilson's disease**. - While copper can cause ocular damage, its presentation differs from siderosis bulbi, often characterized by a **Kayser-Fleischer ring** in Wilson's disease or intense inflammation with foreign body. *Selenium* - **Selenium** is an essential trace element, but its ocular toxicity is rare and typically associated with **chronic industrial exposure** or **excessive supplementation**. - It does not directly cause siderosis bulbi; ocular manifestations, if any, are usually non-specific and not related to intraocular foreign bodies.

Q: Most common immediate complication of traumatic iridodialysis is

Hyphema. ***Hyphema*** - **Traumatic iridodialysis** involves the tearing of the iris root from the ciliary body at its insertion, which directly damages blood vessels in this highly vascular area - This leads to bleeding into the anterior chamber, causing **hyphema** (collection of blood in anterior chamber) - **Hyphema is the most common immediate complication** of iridodialysis, occurring in the majority of cases - The blood typically settles inferiorly due to gravity, creating a visible fluid level *Iridoplegia* - **Iridoplegia** (traumatic mydriasis) refers to paralysis of the iris sphincter muscle, causing a fixed dilated pupil - While this can occur with severe iris trauma, it is less common than hyphema with iridodialysis - It results from direct damage to the sphincter pupillae muscle or its nerve supply rather than from the iris root avulsion itself *Angle recession* - **Angle recession** is a tear in the ciliary body face between longitudinal and circular muscle fibers - It is a distinct injury that may **coexist** with iridodialysis from the same blunt trauma, but one does not cause the other - Both are separate manifestations of blunt ocular trauma affecting different anatomical structures - Angle recession can lead to late-onset glaucoma in 5-10% of cases *Glaucoma* - **Glaucoma** is a potential **late complication** rather than an immediate result of iridodialysis - Large iridodialysis can cause hypotony initially; small dialysis may lead to chronic drainage angle abnormalities - Secondary glaucoma typically develops months to years after the initial injury - Hyphema is the acute, immediate manifestation directly caused by vascular disruption

Q: Commonest site of ocular foreign body lies in

Cornea. ***Cornea*** - The **cornea** is the **commonest site** for ocular foreign bodies, accounting for the majority of cases seen in clinical practice. - The cornea's **exposed position** on the anterior surface of the eye makes it the primary target for airborne particles, metallic debris, and environmental foreign bodies. - Corneal foreign bodies cause characteristic symptoms including **sharp pain**, **photophobia**, **foreign body sensation**, **lacrimation**, and **blepharospasm**, which typically prompt immediate medical attention. - Common sources include **metallic particles** from grinding or hammering, **dust**, **wood fragments**, and **vegetative matter**. *Subtarsal sulcus* - The subtarsal sulcus (superior palpebral fornix) is a location where foreign bodies can become lodged, particularly under the upper eyelid. - The **upper eyelid's sweeping motion** can trap particles in this groove, causing persistent irritation with each blink. - While clinically significant when they occur, foreign bodies in this location are **less frequent** than corneal foreign bodies. - These typically require **eyelid eversion** for detection and removal. *Bulbar conjunctiva* - Foreign bodies on the bulbar conjunctiva are relatively common but occur less frequently than corneal foreign bodies. - The **bulbar conjunctiva** covers the anterior sclera, and foreign bodies here are typically visible and often easily irrigated out. - The smooth surface makes adherence less likely compared to the corneal epithelium. *Limbus* - The limbus (corneoscleral junction) is a less common site for foreign body lodging. - Foreign bodies at the **limbus** can be particularly bothersome due to its **high innervation** and vascularity. - This location is less frequently affected than the central cornea.

Q: Following blunt trauma a young male presents with a D shaped pupil. What is the diagnosis?

Iridodialysis. ***Iridodialysis*** - A **D-shaped pupil** strongly suggests **iridodialysis**, which is a disinsertion of the iris root from the ciliary body. - This typically occurs after **blunt trauma** to the eye, allowing the pupil to be distorted towards the point of detachment. *Orbital fracture* - An orbital fracture often presents with **periorbital ecchymosis**, **diplopia**, **enophthalmos**, or **proptosis**, depending on the fracture location. - While it results from blunt trauma, it doesn't directly cause a D-shaped pupil but can lead to other ocular complications. *Traumatic hyphema* - Traumatic hyphema is characterized by **blood in the anterior chamber** of the eye, which can be visible as a red fluid level. - While caused by blunt trauma, it typically presents with blurred vision and pain, not a D-shaped pupil. *Iridoschisis* - Iridoschisis is a rare condition involving the **splitting of the iris stroma**, usually in the elderly, and is not typically associated with acute trauma or a D-shaped pupil. - It often leads to **fine, detached iris fibers** floating in the anterior chamber, rather than a gross deformation of the pupil.

Q: A 33-year-old patient suffers from blunt trauma to the eye. Fundoscopy shows a cherry red spot, the probable diagnosis is

Central Retinal Artery Occlusion. ***Central Retinal Artery Occlusion*** - A **cherry red spot** on fundoscopy is a classic sign of **central retinal artery occlusion (CRAO)**, occurring due to the opaque retina surrounding the fovea, which maintains its blood supply from the choroid. - While blunt trauma can cause CRAO, the primary mechanism is often an **arterial embolism** or thrombus, leading to acute, painless vision loss. *Retinoblastoma* - Retinoblastoma is a **childhood eye cancer** most commonly presenting with **leukocoria** (white pupillary reflex) and strabismus, not typically a cherry red spot. - Although it can present with retinal detachment, the characteristic fundoscopic finding is a **white intraocular mass**, not an ischemic retinal appearance. *Optic nerve transection* - Optic nerve transection results in immediate, severe vision loss and a **positive relative afferent pupillary defect (RAPD)**, but it generally does not cause a cherry red spot. - Fundoscopy after optic nerve transection would initially appear normal, with subsequent **optic disc pallor** developing over weeks to months. *Posterior Vitreous Detachment* - **Posterior vitreous detachment (PVD)** is a common age-related condition presenting with **floaters** and **flashes of light**. - Fundoscopy typically reveals a **Weiss ring** (a ring of glial tissue) and vitreous opacities, not a cherry red spot, and vision loss is often not as sudden or severe as CRAO.

Q: Berlin's edema is due to

Blunt trauma to eye. ***Blunt trauma to eye*** - **Berlin's edema**, also known as **commotio retinae**, is a form of **retinal edema** that occurs after **blunt trauma to the eye**. - The trauma causes a disruption of the photoreceptor outer segments and retinal pigment epithelium, leading to extracellular and intracellular fluid accumulation. *Choroidal melanoma* - This is a **malignant tumor** arising from the melanocytes in the choroid, not caused by trauma. - Presents as a pigmented mass in the choroid and can lead to **retinal detachment** or **vision loss** due to tumor growth. *Pars planitis* - This is a form of **intermediate uveitis**, characterized by inflammation of the pars plana, ciliary body, and peripheral retina. - It is an **inflammatory condition**, not directly caused by acute trauma, and often presents with **floaters** and **blurred vision**. *Extradural hemorrhage* - This refers to bleeding between the inner surface of the skull and the dura mater, typically in the brain. - It is a **neurological emergency** usually caused by head injury, and its direct effect is not Berlin's edema in the eye.

Q: Sympathetic ophthalmitis results from -

Penetrating injury of ciliary body. ***Penetrating injury of ciliary body*** - **Sympathetic ophthalmitis** is a rare, bilateral granulomatous panuveitis that occurs after a **penetrating ocular trauma** or intraocular surgery, most commonly involving the ciliary body or uveal tissue. - The injury exposes hidden **uveal antigens** to the immune system, leading to a delayed-type hypersensitivity reaction against the fellow (non-injured) eye. - Typically develops weeks to months after the initial injury. *Glaucoma* - **Glaucoma** is a group of eye conditions that damage the optic nerve, often due to elevated intraocular pressure. - It is a consequence or complication of ocular trauma, not a cause of sympathetic ophthalmitis. - Does not involve the autoimmune mechanism seen in sympathetic ophthalmitis. *Blunt trauma to the eye* - **Blunt trauma** can cause various ocular complications (hyphema, angle recession, retinal detachment) but does not typically expose uveal antigens. - Sympathetic ophthalmitis specifically requires **penetrating injury** that disrupts the integrity of the uveal tissue. - The key distinction is penetrating vs. blunt mechanism of injury. *Trachoma* - **Trachoma** is a chronic eye infection caused by *Chlamydia trachomatis*, primarily affecting the conjunctiva and cornea. - It is an infectious process and not related to penetrating trauma or autoimmune response to uveal antigens. - Represents a completely different disease mechanism (infectious vs. autoimmune).

Question 1

Which of the following intraocular foreign bodies causes severe toxicity and needs to be removed promptly?

Accepted Answer

Copper

Answer

Aluminium

Answer

Chromium

Answer

Nickel

Question 2

Most common cause of hyphema due to Blunt trauma

Accepted Answer

Major arterial circle

Answer

Conjunctival vessels

Answer

Minor arterial circle

Answer

Choroidal veins

Question 3

Most serious injury to the eye is caused by:

Accepted Answer

Lime

Answer

Nitric acid

Answer

Hydrochloric acid

Answer

Sulphuric acid

Question 4

Four months after a blast injury, a middle aged man developed siderosis bulbi. It is due to:

Accepted Answer

Iron

Answer

Gold

Answer

Copper

Answer

Selenium

Question 5

Most common immediate complication of traumatic iridodialysis is

Accepted Answer

Hyphema

Answer

Iridoplegia

Answer

Angle recession

Answer

Glaucoma

Question 6

Commonest site of ocular foreign body lies in

Accepted Answer

Cornea

Answer

Subtarsal sulcus

Answer

Bulbar conjunctiva

Answer

Limbus

Question 7

Following blunt trauma a young male presents with a D shaped pupil. What is the diagnosis?

Accepted Answer

Iridodialysis

Answer

Orbital fracture

Answer

Traumatic hyphema

Answer

Iridoschisis

Question 8

A 33-year-old patient suffers from blunt trauma to the eye. Fundoscopy shows a cherry red spot, the probable diagnosis is

Accepted Answer

Central Retinal Artery Occlusion

Answer

Retinoblastoma

Answer

Optic nerve transection

Answer

Posterior Vitreous Detachment

Question 9

Berlin's edema is due to

Accepted Answer

Blunt trauma to eye

Answer

Choroidal melanoma

Answer

Pars planitis

Answer

Extradural hemorrhage

Question 10

Sympathetic ophthalmitis results from -

Accepted Answer

Penetrating injury of ciliary body

Answer

Glaucoma

Answer

Blunt trauma to the eye

Answer

Trachoma

Ocular Trauma — MCQs

Ocular Trauma — MCQs

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