Diseases of the Conjunctiva Practice Questions

Q: Conjunctival staining is done by all except:

India ink. ***India ink*** - **India ink** is primarily used for staining capsules of microorganisms (e.g., *Cryptococcus neoformans*) in microbiology, not for ocular surface staining. - It is a **negative stain** that outlines the microbe rather than directly staining its parts. *Fluorescein* - **Fluorescein** is a common dye used to stain the **cornea** and **conjunctiva**, revealing abrasions, ulcers, and foreign bodies. - It highlights areas where epithelial cells are damaged, allowing it to penetrate into the bare stroma. *Rose Bengal* - **Rose Bengal** is used to stain **devitalized or degenerated epithelial cells** on the conjunctiva and cornea, particularly in dry eye syndrome. - It also stains **mucus filaments** and areas of tear film instability. *Lissamine* - **Lissamine green** is a vital dye similar to Rose Bengal, used to detect **devitalized conjunctival and corneal cells**. - It is often preferred over Rose Bengal because it causes less stinging and discomfort to the patient.

Q: In which condition is there a deficiency in the mucin layer of the tear film?

Keratoconjunctivitis sicca (dry eye syndrome). ***Keratoconjunctivitis sicca (dry eye syndrome)*** - Dry eye syndrome has **multiple subtypes**, including **mucin-deficient dry eye** caused by goblet cell dysfunction or loss. - Conditions causing goblet cell damage (Stevens-Johnson syndrome, ocular pemphigoid, vitamin A deficiency, chronic conjunctivitis) lead to **mucin layer deficiency** as a component of dry eye. - The **mucin layer**, produced by conjunctival goblet cells, is essential for tear film adhesion to the corneal epithelium; its deficiency prevents proper wetting even with adequate aqueous. - While aqueous-deficient dry eye is more common, **mucin-deficient dry eye** is a recognized subtype specifically addressing the question. *Aqueous tear deficiency due to lacrimal gland dysfunction* - This specifically describes **aqueous layer deficiency**, not mucin deficiency. - The lacrimal gland produces the aqueous component; this option addresses a different layer of the tear film. - Mucin production by goblet cells would be unaffected in isolated lacrimal gland dysfunction. *Obstruction in tear drainage pathways* - This causes **epiphora** (excessive tearing/overflow), not deficiency of any tear film component. - The problem is impaired drainage through the nasolacrimal system, leading to tear accumulation rather than reduced tear film quality. *Corneal damage due to viral infection* - Viral keratitis causes **epithelial damage and inflammation**, not primary mucin layer deficiency. - While secondary effects on tear film may occur, the underlying pathology is infectious/inflammatory, not goblet cell dysfunction.

Q: Iron deposition line at edge of pterygium on corneal epithelium is known as?

Stocker's line. ***Stocker's line*** - **Stocker's line** is a **corneal iron deposition line** that occurs at the leading edge of a **pterygium**. - It is formed due to the accumulation of **iron pigment** within the **corneal epithelium** as a result of tear film stagnation induced by the elevated pterygium. *KF Ring* - **Kayser-Fleischer (KF) ring** is a **copper deposition** in Descemet's membrane of the **cornea**, indicative of **Wilson's disease**. - It presents as a **golden-brown or green-brown ring** and is not associated with pterygium. *Fleischer ring* - **Fleischer ring** is a **circumferential iron deposition** in the **corneal epithelium** at the base of the **cone in keratoconus**. - This ring occurs due to tear film pooling at the base of the ectatic cornea, leading to iron accumulation, and is distinct from pterygium-associated iron lines. *Ferry's line* - **Ferry's line** is an **iron deposition line** seen in the **corneal epithelium** around the **filtering bleb after glaucoma surgery**. - It is also caused by tear film alterations and iron accumulation, but its location and etiology differ from Stocker's line.

Q: A 50-year-old male presents with cicatricial entropion of the upper and lower eyelids. Upon eversion of the upper eyelid, linear conjunctival scars are observed. What is the most likely diagnosis?

Trachoma. ***Trachoma*** - **Cicatricial entropion** with **linear conjunctival scars** (specifically **Arlt's line**) along the upper tarsal conjunctiva are pathognomonic late-stage signs of chronic ocular *Chlamydia trachomatis* infection, known as trachoma. - This condition is a leading cause of preventable blindness worldwide, predominantly affecting developing countries due to poor hygiene. *Spring catarrh* - Also known as **vernal keratoconjunctivitis**, this is a chronic, bilateral allergic conjunctivitis, usually seen in children, characterized by large, flattened papillae on the upper tarsal conjunctiva ("cobblestone papillae") and often associated with shield ulcers on the cornea. - While it affects the upper eyelid and can cause scarring in severe, chronic cases, it typically does not lead to the specific linear scarring and cicatricial entropion seen in trachoma. *Ligneous conjunctivitis* - This rare form of chronic pseudomembranous conjunctivitis is characterized by the formation of **wood-like, firm, white-yellow fibrinous plaques** on the conjunctiva, often associated with a deficiency in plasminogen. - It does not present with the typical linear scarring or cicatricial entropion characteristic of trachoma. *Parinaud oculoglandular syndrome* - This syndrome is characterized by **unilateral granulomatous conjunctivitis** with prominent preauricular and/or submandibular **lymphadenopathy**, often caused by bacterial infections (e.g., Cat Scratch Disease due to *Bartonella henselae*) or viral infections. - It does not cause the diffuse cicatricial changes or entropion seen in trachoma and is typically an acute or subacute process rather than a chronic scarring one.

Q: What is the primary causative agent of swimming pool conjunctivitis?

Adenovirus type 3. ***Adenovirus type 3*** - **Adenovirus type 3** is the most common cause of **pharyngoconjunctival fever**, often associated with outbreaks in swimming pools. - This condition is characterized by **acute follicular conjunctivitis**, fever, and pharyngitis. *Chlamydia trachomatis* - This bacterium causes **inclusion conjunctivitis**, which is typically associated with **genital infection** and can be transmitted to the eye. - It presents differently than swimming pool conjunctivitis, often with more chronic symptoms and potential for corneal involvement. *Adenovirus type 8* - **Adenovirus type 8** is a common cause of **epidemic keratoconjunctivitis (EKC)**, which is more severe and often involves corneal inflammation and scarring. - While an adenovirus, it is not the primary agent in typical "swimming pool conjunctivitis" outbreaks. *Gonococcus* - **Neisseria gonorrhoeae** causes severe hyperacute purulent conjunctivitis, especially in neonates (**ophthalmia neonatorum**), and can lead to rapid corneal perforation if untreated. - This is a distinct and much more serious condition not typically associated with swimming pools.

Q: What is the most common problem following surgical treatment of pterygium?

Recurrence. ***Recurrence*** - **Pterygium recurrence** is the most frequent complication after surgical excision, with rates varying significantly based on the surgical technique used. - Factors like incomplete excision, younger age, and environmental exposures can increase the risk of the pterygium growing back. *Corneal ulceration* - **Corneal ulceration** is a serious but relatively rare complication of pterygium surgery, often associated with infection or improper wound healing. - While possible, it is not the most common problem observed post-operatively. *Astigmatism* - **Astigmatism** can be present before pterygium surgery due to the mass effect on the cornea or can be induced or altered by the surgery itself. - Although it can be a significant visual consequence, it is not the most common post-operative problem compared to recurrence. *Scleral scarring* - **Scleral scarring** can occur at the site of pterygium excision, especially if bare sclera techniques are used, or with extensive use of adjuncts like mitomycin C. - While it can be cosmetically unappealing or even sight-threatening in rare cases, it is less common than recurrence.

Q: What is the bacterial cause most commonly associated with hyperacute severe bacterial conjunctivitis?

Neisseria. ***Neisseria*** - **Neisseria gonorrhoeae** and **Neisseria meningitidis** are well-known causes of hyperacute bacterial conjunctivitis because of their rapid onset and severe inflammatory response. - This form of conjunctivitis is characterized by abundant, thick purulent discharge and can rapidly lead to vision-threatening complications if not treated promptly. *Staphylococcus* - **Staphylococcus aureus** is a common cause of acute bacterial conjunctivitis, but it typically presents with a less severe, non-hyperacute course. - While it can cause significant inflammation, it rarely leads to the fulminant, rapid progression seen with Neisseria infections. *Streptococcus* - **Streptococcus pneumoniae** and **Streptococcus pyogenes** can cause bacterial conjunctivitis, often characterized by red, watery eyes and purulent discharge. - However, their presentation is generally acute rather than hyperacute, with a slower onset and progression compared to Neisseria. *Haemophilus* - **Haemophilus influenzae** is a common cause of bacterial conjunctivitis, particularly in children, often associated with otitis media. - The conjunctivitis caused by Haemophilus is typically acute and self-limiting, not characterized as hyperacute or severely rapidly progressive.

Q: Which among the following is the most common infectious cause of neonatal blindness?

Chlamydia trachomatis. ***Chlamydia trachomatis*** - This is the **most common infectious cause of neonatal blindness** due to its high prevalence as the leading cause of neonatal conjunctivitis (50-60% of cases). - Although Chlamydia causes less severe conjunctivitis than Neisseria gonorrhoeae, its **much higher incidence** means it accounts for more **total cases of blindness** worldwide, especially in areas with limited healthcare access. - Infection occurs during passage through the birth canal of an infected mother, manifesting as **mucopurulent discharge** 5-14 days post-delivery. - Untreated cases can lead to **corneal scarring and blindness**, though this is preventable with timely antibiotic therapy. *Klebsiella* - While Klebsiella can cause neonatal infections, including sepsis and meningitis, it is **not a primary or common cause of neonatal blindness.** - **Ocular involvement** is rare and usually secondary to severe systemic infection rather than direct transmission during birth. *Enterobacter* - Similar to Klebsiella, **Enterobacter species** can cause **neonatal sepsis** and other infections, but they are not a leading cause of neonatal blindness. - **Ophthalmic manifestations** are uncommon and not characteristic of direct infectious blindness in newborns. *Neisseria gonorrhoeae* - This causes **severe hyperacute conjunctivitis** (ophthalmia neonatorum) within the first 5 days of life with high risk of rapid corneal ulceration and perforation. - While **more severe per case** than Chlamydia, gonococcal ophthalmia is **much less common** due to widespread maternal screening, prophylactic eye drops (erythromycin/tetracycline), and lower overall prevalence. - Therefore, despite its severity, it accounts for fewer total cases of neonatal blindness than Chlamydia.

Q: Which of the following statements about pterygium is false?

Arise from any part of conjunctiva. ***Arise from any part of conjunctiva*** **(FALSE - Correct Answer)** - This statement is **FALSE** and thus the correct answer. - Pterygium characteristically arises from the **nasal (interpalpebral) bulbar conjunctiva** in 90-95% of cases. - It does NOT arise from "any part" - it has a specific predilection for the medial (nasal) limbus in the palpebral fissure zone. - Temporal pterygium is much less common (~10% of cases). *Can cause astigmatism* **(TRUE)** - This statement is TRUE. - As a pterygium grows across the cornea, it can induce **corneal astigmatism** by altering the curvature of the cornea. - This irregular corneal surface can blur vision, especially as the pterygium progresses towards the central visual axis. *Surgery is treatment of choice* **(TRUE)** - This statement is TRUE. - **Surgical excision** is the primary treatment for pterygium when it is symptomatic, threatens vision, or causes significant cosmetic concerns. - Indications for surgery include: growth towards the visual axis, inducing high astigmatism, significant discomfort, or cosmetic desire. - Adjunctive measures (mitomycin C, conjunctival autograft) help reduce recurrence. *UV exposure is risk factor* **(TRUE)** - This statement is TRUE. - **Ultraviolet (UV) radiation exposure** is a well-established and significant risk factor for the development and progression of pterygium. - This explains its higher prevalence in individuals living in sunny climates (between 37° N and 37° S latitude - "pterygium belt") and those with outdoor occupations.

Q: Which of the following conditions does not typically cause subconjunctival hemorrhages?

Pellagra. ***Pellagra*** - Pellagra is a **nutritional deficiency disease** caused by a lack of **niacin (vitamin B3)**, characterized by symptoms affecting the **skin, gastrointestinal tract, and nervous system** (dermatitis, diarrhea, dementia, and death if untreated) [1]. - It does **not typically cause subconjunctival hemorrhages** as it primarily affects other organ systems and isn't associated with vascular fragility in the conjunctiva like the other conditions listed [2]. *Whooping cough* - **Violent coughing paroxysms** in whooping cough (pertussis) can significantly increase **venous pressure in the head and neck**. - This elevated pressure can rupture small conjunctival blood vessels, leading to **subconjunctival hemorrhages**. *Scurvy* - Scurvy is caused by **vitamin C deficiency**, which is essential for collagen synthesis and maintaining **blood vessel integrity**. - Lack of vitamin C leads to **fragile capillaries**, making patients prone to bleeding, including **subconjunctival hemorrhages**. *Purpura* - Purpura refers to **purple-colored spots on the skin caused by bleeding underneath the skin**. It is a general term for various conditions characterized by **small vessel bleeding**. - These conditions often involve **vascular fragility or platelet abnormalities**, making individuals susceptible to bleeding in different sites, including the conjunctiva, resulting in **subconjunctival hemorrhages**.

Question 1

Conjunctival staining is done by all except:

Accepted Answer

India ink

Answer

Rose Bengal

Answer

Lissamine

Answer

Fluorescein

Question 2

In which condition is there a deficiency in the mucin layer of the tear film?

Accepted Answer

Keratoconjunctivitis sicca (dry eye syndrome)

Answer

Aqueous tear deficiency due to lacrimal gland dysfunction

Answer

Obstruction in tear drainage pathways

Answer

Corneal damage due to viral infection

Question 3

Iron deposition line at edge of pterygium on corneal epithelium is known as?

Accepted Answer

Stocker's line

Answer

KF Ring

Answer

Fleischer ring

Answer

Ferry's line

Question 4

A 50-year-old male presents with cicatricial entropion of the upper and lower eyelids. Upon eversion of the upper eyelid, linear conjunctival scars are observed. What is the most likely diagnosis?

Accepted Answer

Trachoma

Answer

Ligneous conjunctivitis

Answer

Parinaud oculoglandular syndrome

Answer

Spring catarrh

Question 5

What is the primary causative agent of swimming pool conjunctivitis?

Accepted Answer

Adenovirus type 3

Answer

Chlamydia trachomatis

Answer

Adenovirus type 8

Answer

Gonococcus

Question 6

What is the most common problem following surgical treatment of pterygium?

Accepted Answer

Recurrence

Answer

Corneal ulceration

Answer

Astigmatism

Answer

Scleral scarring

Question 7

What is the bacterial cause most commonly associated with hyperacute severe bacterial conjunctivitis?

Accepted Answer

Neisseria

Answer

Staphylococcus

Answer

Streptococcus

Answer

Haemophilus

Question 8

Which among the following is the most common infectious cause of neonatal blindness?

Accepted Answer

Chlamydia trachomatis

Answer

Klebsiella

Answer

Enterobacter

Answer

Neisseria gonorrhoeae

Question 9

Which of the following statements about pterygium is false?

Accepted Answer

Arise from any part of conjunctiva

Answer

Can cause astigmatism

Answer

Surgery is treatment of choice

Answer

UV exposure is risk factor

Question 10

Which of the following conditions does not typically cause subconjunctival hemorrhages?

Accepted Answer

Pellagra

Answer

Whooping cough

Answer

Scurvy

Answer

Purpura

Diseases of the Conjunctiva — MCQs

Diseases of the Conjunctiva — MCQs

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