Ocular Trauma Practice Questions

Q: Diameter of the Vossius's ring is

Smaller than the normal pupil. ***Smaller than the normal pupil*** - The **Vossius's ring** is a deposition of pigment on the anterior lens capsule, formed by contact with the iris during trauma. - Due to the **constriction of the pupil** at the time of impact, the imprinting tends to be *smaller* than the resting pupil size. *Equal to normal pupil* - This is incorrect because the ring represents the imprint of the **pupillary margin** against the lens during a moment of **miosis (pupil constriction)** following trauma, not the normal resting pupil size. - The transient nature of the trauma-induced miosis means the imprinted diameter will be less than the typical **resting/normal pupil diameter**. *Much larger than the normal pupil* - This is incorrect because trauma usually causes **pupillary spasm and miosis**, which would result in a *smaller* imprint, not a larger one. - A larger imprint would imply a **dilated pupil** at the time of impact, which is contrary to the typical physiological response. *Slightly larger than the normal pupil* - This is incorrect as the trauma-induced **miosis** would make the imprint *smaller* than the normal pupil, not larger. - Even a slight increase in size would contradict the mechanism of formation, which involves temporary **pupillary constriction**.

Q: Which of the following ophthalmologic conditions shows 'Vossius ring' during examination?

Traumatic iritis. ***Traumatic iritis*** - A **Vossius ring** is a circular pigment deposit on the anterior lens capsule, formed by the impact of the iris during **ocular trauma**. - Its presence is a clear indicator of **blunt globe trauma**, which often leads to traumatic iritis. *Angle closure glaucoma* - This condition involves an **acute increase in intraocular pressure** due to the iris blocking the drainage angle. - While it can cause severe pain and vision loss, it does not involve the formation of a **Vossius ring**. *Retinal detachment* - This condition involves the separation of the sensory retina from the underlying retinal pigment epithelium. - Symptoms include **flashing lights**, **floaters**, and a **"curtain" vision loss**, with no association with a Vossius ring. *Corneal ulcer* - A corneal ulcer is an **open sore on the cornea**, typically caused by infection or injury. - It presents with **pain**, **photophobia**, **redness**, and **discharge**, without the characteristic lens pigment deposit.

Q: A young 23-year-old black African man presents with a hyphema in the right eye after blunt injury. All of the following are acceptable initial treatments except?

Carbonic anhydrase inhibitor pressure drops. ***Carbonic anhydrase inhibitor pressure drops*** - **Carbonic anhydrase inhibitors** are generally avoided in patients with **sickle cell trait or disease** because they can cause **acidosis**, which may induce RBC sickling within the anterior chamber and worsen secondary hemorrhage or complications like **increased intraocular pressure (IOP)**. - The patient's presentation as a **young black African man** increases the suspicion for **sickle cell trait/disease**, making this treatment potentially harmful. *Sleep with the head elevated* - Elevating the head of the bed helps to settle red blood cells and debris inferiorly in the anterior chamber, which can prevent them from obstructing vision and potentially **reduce rebleeding rates**. - This position can also contribute to **reducing intraocular pressure** by promoting aqueous outflow and preventing pooling of blood. *Cyclopentolate dilating drops* - **Cyclopentolate** is a **cycloplegic agent** that helps to relieve ciliary spasm and pain associated with trauma. - It also dilates the pupil, which helps to prevent **posterior synechiae formation** (adhesions between the iris and lens) and allows for better examination of the fundus. *Prednisolone steroid eye drops* - **Topical corticosteroids** like prednisolone are used to reduce intraocular inflammation that often accompanies a hyphema. - Anti-inflammatory effects help to decrease the risk of **secondary hemorrhage** and improve overall healing by stabilizing damaged blood vessels.

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.

Question 1

Diameter of the Vossius's ring is

Accepted Answer

Smaller than the normal pupil

Answer

Equal to normal pupil

Answer

Much larger than the normal pupil

Answer

Slightly larger than the normal pupil

Question 2

Which of the following ophthalmologic conditions shows 'Vossius ring' during examination?

Accepted Answer

Traumatic iritis

Answer

Angle closure glaucoma

Answer

Retinal detachment

Answer

Corneal ulcer

Question 3

All are true about eight-ball hyphema EXCEPT

Accepted Answer

Blackball hyphema causes less pupillary block and less angle closure

Answer

AC completely filled with bright red blood is total hyphema, blackball hyphema if dark red blood

Answer

Also called Eight ball hyphema

Answer

The black colour is suggestive of impaired aqueous circulation and decreased oxygen

Question 4

A young 23-year-old black African man presents with a hyphema in the right eye after blunt injury. All of the following are acceptable initial treatments except?

Accepted Answer

Carbonic anhydrase inhibitor pressure drops

Answer

Sleep with the head elevated

Answer

Cyclopentolate dilating drops

Answer

Prednisolone steroid eye drops

Question 5

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 6

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 7

Most serious injury to the eye is caused by:

Accepted Answer

Lime

Answer

Nitric acid

Answer

Hydrochloric acid

Answer

Sulphuric acid

Question 8

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 9

Most common immediate complication of traumatic iridodialysis is

Accepted Answer

Hyphema

Answer

Iridoplegia

Answer

Angle recession

Answer

Glaucoma

Question 10

Commonest site of ocular foreign body lies in

Accepted Answer

Cornea

Answer

Subtarsal sulcus

Answer

Bulbar conjunctiva

Answer

Limbus

Ocular Trauma — MCQs

Ocular Trauma — MCQs

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