Scleral Trauma Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Scleral Trauma. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Scleral Trauma Indian Medical PG 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)
Scleral Trauma 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.
Scleral Trauma Indian Medical PG 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
Scleral Trauma 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.
Scleral Trauma Indian Medical PG 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)
Scleral Trauma 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.
Scleral Trauma Indian Medical PG 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
Scleral Trauma 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.
Scleral Trauma Indian Medical PG Question 5: Sclera is weakest at the level of:
- A. Ora serrata
- B. Equator
- C. Macula
- D. Insertion of extraocular muscles (Correct Answer)
Scleral Trauma 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.
Scleral Trauma Indian Medical PG 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
Scleral Trauma 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.
Scleral Trauma Indian Medical PG Question 7: Postoperative complications of cataract surgery are all except?
- A. Endophthalmitis
- B. Glaucoma
- C. Scleritis (Correct Answer)
- D. After cataract
Scleral Trauma 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.
Scleral Trauma Indian Medical PG 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
Scleral Trauma 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."
Scleral Trauma Indian Medical PG 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
Scleral Trauma 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.
Scleral Trauma Indian Medical PG 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
Scleral Trauma 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.
More Scleral Trauma Indian Medical PG questions available in the OnCourse app. Practice MCQs, flashcards, and get detailed explanations.
