Scleral Trauma — MCQs
A case of injury to right brow due to a fall from scooter presents with sudden loss of vision in the right eye. The pupil shows absent direct reflex but a normal consensual pupillary reflex is present. The fundus is normal. The treatment of choice is:
Which of the following is the first visual field defect in open-angle glaucoma?
All of the following are complications of traumatic hyphema except which of the following?
Following blunt trauma a young male presents with a D shaped pupil. What is the diagnosis?
Sclera is weakest at the level of:
A man presents 6 hrs after head injury complaining of mild proptosis and scleral hyperemia:
Postoperative complications of cataract surgery are all except?
Which of the following is known as the dangerous zone of the eye?
A 22-year-old Air-force test pilot presents after flying a sortie. He reports no pain or vision changes. Eye examination reveals a localized red patch on the sclera. What is the most likely diagnosis?
Panophthalmitis involves ?
Scleral Trauma Indian Medical PG Practice Questions and MCQs
Question 1: A case of injury to right brow due to a fall from scooter presents with sudden loss of vision in the right eye. The pupil shows absent direct reflex but a normal consensual pupillary reflex is present. The fundus is normal. The treatment of choice is:
- A. Pulse methyl Prednisolone 250 mg four times daily for three days
- B. Emergency optic canal decompression
- C. Oral Prednisolone 1.5 mg/kg body weight
- D. Intensive intravenous corticosteroids as prescribed for spinal injuries to be instituted within six hours (Correct Answer)
Explanation: ***Intensive intravenous corticosteroids as prescribed for spinal injuries to be instituted within six hours*** - The sudden **loss of vision** with a **traumatic brow injury** and **afferent pupillary defect** (absent direct reflex, normal consensual) suggests **traumatic optic neuropathy (TON)**. - While the efficacy of corticosteroids is debated, high-dose intravenous corticosteroids, often following the **National Acute Spinal Cord Injury Study (NASCIS)** protocols (similar to spinal injury treatment), are a common initial treatment for TON, especially when administered within 6-8 hours of injury to reduce inflammation and edema around the optic nerve. *Pulse methyl Prednisolone 250 mg four times daily for three days* - This dosage regimen is a form of **pulse steroid therapy**, but the specific dose and frequency may not align with the standard high-dose IV corticosteroid protocols used for TON (e.g., typically 1g methylprednisolone daily). - While corticosteroids are used, the precise protocol and optimal dosing for TON are critical and vary from this option. *Emergency optic canal decompression* - **Optic canal decompression surgery** is considered in cases of TON where there is direct compression of the optic nerve or a lack of response to corticosteroid therapy. - It is not the initial treatment of choice for all TON cases and carries significant surgical risks; corticosteroid therapy is usually attempted first. *Oral Prednisolone 1.5 mg/kg body weight* - **Oral corticosteroids** are generally not sufficient for the acute, severe inflammation seen in traumatic optic neuropathy. - **Intravenous administration** is preferred for its rapid and higher systemic bioavailability to achieve therapeutic levels at the optic nerve.
Question 2: Which of the following is the first visual field defect in open-angle glaucoma?
- A. Ring scotoma
- B. Paracentral scotoma (Correct Answer)
- C. Bitemporal hemianopia
- D. Tunnel vision
Explanation: ***Paracentral scotoma*** - This is the **earliest visual field defect** detected in open-angle glaucoma, typically appearing in the **Bjerrum area** (10-20° from fixation). - Most commonly occurs as a **superior or inferior arcuate scotoma** in the nasal field. - Results from damage to the **retinal nerve fiber layer** around the **optic disc**, which is particularly vulnerable to elevated intraocular pressure. - These scotomas respect the **horizontal raphe** and follow the arcuate nerve fiber bundle pattern. *Ring scotoma* - A **ring scotoma** (Bjerrum scotoma) typically occurs later in the progression of glaucoma, when superior and inferior arcuate defects coalesce to form a ring-like pattern. - This represents **advanced glaucomatous damage** and is not an early finding. *Bitemporal hemianopia* - This visual field defect is characteristic of **optic chiasm compression**, commonly due to a **pituitary tumor** or other suprasellar lesions. - It is **not associated with glaucoma**, which causes damage to the optic nerve fibers within the eye, not at the chiasm. *Tunnel vision* - **Tunnel vision** represents severe, **end-stage glaucoma**, where only a small central island of vision remains. - It indicates extensive loss of peripheral visual field and is a late finding, not an early one.
Question 3: 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 4: Following blunt trauma a young male presents with a D shaped pupil. What is the diagnosis?
- A. Iridodialysis (Correct Answer)
- B. Orbital fracture
- C. Traumatic hyphema
- D. Iridoschisis
Explanation: ***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.
Question 5: Sclera is weakest at the level of:
- A. Ora serrata
- B. Equator
- C. Macula
- D. Insertion of extraocular muscles (Correct Answer)
Explanation: ***Insertion of extraocular muscles*** - The sclera is thinnest (0.3-0.4 mm) and therefore weakest where the **tendons of the extraocular muscles insert**, as these points are subject to constant tugging and tension. - This anatomical feature is clinically relevant in cases of **globe rupture** (the sclera is most vulnerable here during trauma) and during **strabismus surgery**. - The four rectus muscles insert approximately 5-7 mm from the limbus, and these insertion sites represent the thinnest portions of the sclera. *Ora serrata* - This is the junction between the retina and the ciliary body, located approximately 6-7 mm behind the limbus. - The sclera at this location is relatively thick and robust to provide structural support. - Not a site of particular weakness. *Equator* - The equator is the imaginary circumferential line around the middle of the eyeball. - At this level, the sclera has a uniform thickness of approximately 0.6 mm, which is thicker than at muscle insertion sites. - Provides structural integrity and is not a point of weakness. *Macula* - The macula is a specialized area of the retina responsible for central high-acuity vision. - The sclera overlying the posterior pole (including the macular area) is approximately 1.0 mm thick, making it the **thickest portion** of the sclera. - Not a site of weakness; its significance lies in visual function, not mechanical strength.
Question 6: A man presents 6 hrs after head injury complaining of mild proptosis and scleral hyperemia:
- A. Caroticocavernous fistula
- B. Retro-orbital hematoma (Correct Answer)
- C. Pneumo-orbit
- D. Orbital cellulitis
Explanation: ***Retro-orbital hematoma*** - The sudden onset of **proptosis** and **scleral hyperemia** within hours of a head injury is highly suggestive of bleeding behind the eye. - A **retro-orbital hematoma** causes increased orbital pressure, leading to the forward displacement of the eyeball (proptosis) and conjunctival injection (scleral hyperemia). *Caroticocavernous fistula* - This condition involves an abnormal communication between the carotid artery and the cavernous sinus, typically presenting with a **pulsatile proptosis** and a **bruit** over the eye. - While it can cause proptosis and hyperemia, its onset is usually not as acute as 6 hours post-trauma without being a direct major vessel injury in a recent trauma. *Pneumo-orbit* - A pneumo-orbit involves **air entering the orbit**, often following trauma that fractures an orbital wall communicating with a paranasal sinus. - Symptoms include **periorbital crepitus** and exophthalmos, but scleral hyperemia is not a primary or dominant feature. *Orbital cellulitis* - Orbital cellulitis is an **infection of the orbital tissues**, usually presenting with proptosis, ophthalmoplegia, pain, and fever. - This is an infectious process and would typically take longer than 6 hours to develop to such an extent after an acute trauma without an open wound or obvious contamination.
Question 7: Postoperative complications of cataract surgery are all except?
- A. Endophthalmitis
- B. Glaucoma
- C. Scleritis (Correct Answer)
- D. After cataract
Explanation: ***Scleritis*** - **Scleritis** is an inflammatory condition of the sclera, which is the white outer layer of the eye, and is generally not a direct postoperative complication of cataract surgery. - While it can occur in patients with systemic inflammatory diseases, it is not causally linked to cataract surgery itself. *Endophthalmitis* - **Endophthalmitis** is a severe infection of the intraocular fluids (vitreous and aqueous humor) and tissues, representing a rare but devastating complication of cataract surgery. - It typically presents with rapidly progressive vision loss, pain, and hypopyon (pus in the anterior chamber) within days to weeks post-surgery. *Glaucoma* - **Glaucoma** can develop or worsen after cataract surgery due to various mechanisms, such as inflammation leading to trabecular meshwork dysfunction, pupillary block, or retained lens material. - Postoperative intraocular pressure (IOP) elevation can result in optic nerve damage if not promptly managed. *After cataract* - **After cataract**, also known as **posterior capsule opacification (PCO)**, is the most common long-term complication of cataract surgery. - It occurs when residual lens epithelial cells proliferate and migrate onto the posterior lens capsule, causing blurring of vision months to years after surgery, and is typically treated with Nd:YAG laser capsulotomy.
Question 8: Which of the following is known as the dangerous zone of the eye?
- A. Optic nerve
- B. Retina
- C. Ciliary body (Correct Answer)
- D. Sclera
Explanation: ***Ciliary body*** - The **dangerous zone** (or dangerous area) of the eye refers to the region approximately **3-4 mm posterior to the limbus**, which overlies the **pars plana of the ciliary body**. - This area is termed "dangerous" because penetrating injuries or surgical trauma in this zone can result in multiple serious complications: - **Ciliary body damage** → Hypotony, hemorrhage, sympathetic ophthalmia - **Lens injury** → Traumatic cataract formation - **Vitreous involvement** → Endophthalmitis, vitreous hemorrhage, retinal detachment - This zone is clinically significant because the **extraocular muscles insert** near this region, and it represents the thinnest part of the sclera with underlying vital structures. *Sclera* - While the sclera forms the outer protective coat of the eye and can be vulnerable to trauma, the term "dangerous zone" specifically refers to a particular region (overlying the ciliary body), not the sclera as a whole. - The sclera provides structural support but is not itself called the dangerous zone. *Optic nerve* - The optic nerve transmits visual information from the retina to the brain and damage causes irreversible vision loss. - However, it is not referred to as the "dangerous zone" in ophthalmological terminology. *Retina* - The retina is the light-sensitive neurosensory tissue essential for vision. - Retinal damage leads to vision loss (e.g., retinal detachment, macular degeneration), but it is not termed the "dangerous zone."
Question 9: A 22-year-old Air-force test pilot presents after flying a sortie. He reports no pain or vision changes. Eye examination reveals a localized red patch on the sclera. What is the most likely diagnosis?
- A. Hyphema
- B. Subconjunctival hemorrhage (Correct Answer)
- C. Keratitis
- D. Allergic conjunctivitis
Explanation: ***Subconjunctival hemorrhage*** - A **localized red patch on the sclera** with no pain or vision changes, especially after activities that can increase venous pressure (like flying a sortie or straining), is characteristic of a **subconjunctival hemorrhage**. - It results from the rupture of small blood vessels beneath the conjunctiva, causing blood to pool. *Hyphema* - This involves blood in the **anterior chamber of the eye**, usually visible as a fluid level and often causing pain or blurred vision. - It typically results from **trauma** and is not described as a localized red patch on the sclera. *Keratitis* - **Keratitis** is inflammation of the cornea, causing pain, redness, photophobia, and often blurred vision. - The patient has no pain or vision changes, and the presentation is a localized scleral patch, not diffuse corneal involvement. *Allergic conjunctivitis* - Presents with **redness**, itching, tearing, and often bilateral involvement, sometimes with discharge. - The description of a solitary, localized red patch without other allergic symptoms makes this diagnosis unlikely.
Question 10: Panophthalmitis involves ?
- A. Inner coat of eyeball
- B. Inner and outer coat but sparing tenon's capsule
- C. All structures of the eyeball including Tenon's capsule (Correct Answer)
- D. None of the options
Explanation: ***All structures of the eyeball including Tenon's capsule*** - **Panophthalmitis** is a severe inflammation or infection that affects **all coats of the eyeball** (sclera, choroid, retina). - Crucially, it also extends to the **intraocular contents** and the **Tenon's capsule**, leading to potential destruction of the entire eye. *Inner coat of eyeball* - This description is characteristic of **uveitis** (inflammation of the uvea: iris, ciliary body, choroid) or **endophthalmitis** if it extends to the vitreous and retina. - However, **panophthalmitis** is a more extensive condition, involving more than just the inner coats. *Inner and outer coat but sparing tenon's capsule* - This scenario describes **endophthalmitis**, which involves inflammation of the internal structures of the eye (vitreous, retina, choroid) and potentially the sclera. - However, the sparing of Tenon's capsule differentiates it from **panophthalmitis**, which expressly includes involvement of this fibrous sheath. *None of the options* - This option is incorrect because Option C accurately describes the comprehensive nature of **panophthalmitis**, which is an inflammation of all ocular structures, including Tenon's capsule. - The definition of panophthalmitis is critical in distinguishing it from less severe inflammatory conditions of the eye.
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