Diseases of the Conjunctiva — MCQs

Diseases of the Conjunctiva Indian Medical PG Practice Questions and MCQs

Question 91: All are known to produce parenchymatous conjunctival xerosis except?

A. Vitamin A deficiency (Correct Answer)
B. Stevens-Johnson syndrome
C. Trachoma
D. Diphtheric membranous conjunctivitis

Explanation: ### Explanation To answer this question, it is essential to distinguish between the two types of conjunctival xerosis: **Epithelial** and **Parenchymatous**. **1. Why Vitamin A Deficiency is the Correct Answer:** Vitamin A deficiency (Xerophthalmia) causes **Epithelial Xerosis**. In this condition, the xerosis is a result of a lack of Vitamin A, which is essential for maintaining the health of the conjunctival epithelium and goblet cells. Crucially, the underlying conjunctival stroma (parenchyma) remains healthy, and there is **no scarring** of the sub-epithelial tissues. This is why the condition is reversible with Vitamin A supplementation. **2. Why the other options are incorrect (Parenchymatous Xerosis):** Parenchymatous xerosis occurs following **cicatrization (scarring)** of the conjunctiva, which leads to the destruction of goblet cells and the ducts of the lacrimal glands. * **Stevens-Johnson Syndrome (SJS):** A severe mucocutaneous reaction that leads to extensive conjunctival scarring and symblepharon. * **Trachoma:** Specifically Stage IV (healed trachoma), where cicatrization of the conjunctiva (Arlt’s line) leads to permanent structural damage. * **Diphtheric Membranous Conjunctivitis:** This is a necrotizing inflammation. The healing process involves extensive fibrosis and scarring of the conjunctival parenchyma. **Clinical Pearls for NEET-PG:** * **Bitot’s Spots:** Characteristic of Vitamin A deficiency; they are triangular, foamy patches found on the bulbar conjunctiva (usually temporal). * **Pemphigoid:** Another common cause of parenchymatous xerosis due to chronic cicatrization. * **Key Differentiator:** If the question mentions **scarring, symblepharon, or chemical burns**, think **Parenchymatous**. If it mentions **malnutrition or night blindness**, think **Epithelial**.

Question 92: Epidemic keratoconjunctivitis is caused by:

A. Neisseria gonorrhoeae
B. Adenovirus (Correct Answer)
C. Corynebacterium diphtheriae
D. Mycobacterium tuberculosis

Explanation: **Explanation:** **Epidemic Keratoconjunctivitis (EKC)** is a highly contagious viral infection of the ocular surface. The correct answer is **Adenovirus**, specifically **serotypes 8, 19, and 37**. EKC is characterized by sudden onset follicular conjunctivitis, significant eyelid edema, and preauricular lymphadenopathy. A hallmark of this condition is the development of **multifocal subepithelial corneal infiltrates**, which are immune-mediated and can persist for months, causing blurred vision and glare. **Why other options are incorrect:** * **Neisseria gonorrhoeae:** Causes hyperacute purulent conjunctivitis, characterized by profuse "creamy" discharge and a high risk of rapid corneal perforation. * **Corynebacterium diphtheriae:** Known for causing **true membranous conjunctivitis**. It produces a thick, greyish-white membrane on the palpebral conjunctiva that bleeds upon peeling. * **Mycobacterium tuberculosis:** Rarely involves the conjunctiva; when it does, it typically presents as a chronic granulomatous conjunctivitis or a Parinaud oculoglandular syndrome, rather than an acute epidemic. **High-Yield Clinical Pearls for NEET-PG:** * **Rule of 8:** EKC is often associated with Adenovirus type 8; symptoms typically appear 8 days after exposure, and keratitis often appears 8 days after the onset of conjunctivitis. * **Transmission:** Highly contagious via respiratory droplets or contaminated fingers/ophthalmic instruments (e.g., tonometers). * **Pharyngoconjunctival Fever (PCF):** Also caused by Adenovirus (serotypes 3, 4, 7), but presents with a triad of fever, pharyngitis, and follicular conjunctivitis (more common in children). * **Management:** Primarily supportive (cold compresses, artificial tears). Steroids are reserved for visually significant subepithelial infiltrates.

Question 93: Which of the following is NOT true about phlyctenular conjunctivitis?

A. It is a Type IV cell-mediated hypersensitivity reaction.
B. Allergens can be endogenous or exogenous. (Correct Answer)
C. The incidence is higher in girls than in boys.
D. Nodular lesions typically occur near the limbus.

Explanation: ### Explanation **Phlyctenular Conjunctivitis** is an allergic nodular inflammation of the conjunctiva and cornea. Understanding its pathophysiology is crucial for NEET-PG. **1. Why Option B is the Correct Answer (The False Statement):** The allergens in phlyctenular conjunctivitis are strictly **endogenous** (internal to the body). The condition is a delayed hypersensitivity response to a protein to which the patient’s tissues have been previously sensitized. It is **not** caused by exogenous (external) allergens like pollen or dust. Historically, the most common endogenous allergen was *Mycobacterium tuberculosis*; however, currently, *Staphylococcus aureus* (from chronic blepharitis) is the most frequent cause. **2. Analysis of Other Options:** * **Option A:** It is indeed a **Type IV (Delayed) cell-mediated hypersensitivity** reaction. This distinguishes it from Vernal Keratoconjunctivitis (Type I). * **Option C:** Epidemiologically, the incidence is significantly **higher in girls** than in boys, typically affecting children and young adults (age 5–15 years). * **Option D:** The hallmark lesion is a **phlycten**—a small, pinkish-white nodule surrounded by a zone of hyperemia. These typically occur at or **near the limbus**. **3. Clinical Pearls for NEET-PG:** * **Triad of Symptoms:** Photophobia, lacrimation, and blepharospasm (especially severe if the cornea is involved). * **Fascicular Ulcer:** A characteristic "serpiginous" corneal ulcer that carries a leash of blood vessels behind it. * **Treatment:** Topical steroids are the mainstay for the ocular lesion, but treating the **underlying cause** (e.g., TB screening or treating Staphylococcal blepharitis) is mandatory to prevent recurrence. * **Differential Diagnosis:** Must be distinguished from Episcleritis (which blanches with adrenaline) and Pingueculitis.

Question 94: Giant papillary conjunctivitis occurs as an allergic response to all except:

A. Contact lens
B. Intraocular lens (Correct Answer)
C. Prosthesis
D. Nylon sutures

Explanation: **Explanation:** **Giant Papillary Conjunctivitis (GPC)** is a localized Type I (IgE-mediated) and Type IV (cell-mediated) hypersensitivity reaction. The primary trigger is **chronic mechanical irritation** of the superior palpebral conjunctiva by a foreign body, combined with the accumulation of proteinaceous deposits on the surface of that object. **Why Intraocular Lens (IOL) is the correct answer:** An IOL is surgically implanted **inside** the eye (within the capsular bag or anterior chamber). Because it is sequestered from the palpebral conjunctiva by the cornea and iris, it does not come into physical contact with the conjunctival lining of the eyelids. Therefore, it cannot cause the mechanical friction or immunological stimulus required to trigger GPC. **Why the other options are incorrect:** * **Contact Lenses (Option A):** The most common cause of GPC. The lens surface (especially soft lenses) rubs against the tarsal conjunctiva during blinking. * **Prosthesis (Option C):** Ocular prostheses in anophthalmic sockets are large, rigid surfaces that frequently cause mechanical irritation and protein buildup, leading to GPC. * **Nylon Sutures (Option D):** Protruding or "buried" monofilament nylon sutures (e.g., after cataract or corneal surgery) act as a focal mechanical irritant to the upper eyelid, causing localized papillary hypertrophy. **High-Yield Clinical Pearls for NEET-PG:** * **Clinical Feature:** Characterized by "giant" papillae (>1 mm in diameter) on the **upper tarsal conjunctiva**, often described as a "cobblestone" appearance. * **Symptoms:** Itching, ropy discharge, and contact lens intolerance (the lens may move excessively due to papillae "gripping" it). * **Management:** Discontinue contact lens wear (primary step), switch to daily disposables, and use topical mast cell stabilizers or antihistamines.

Question 95: Unilateral chronic conjunctivitis may be associated with which of the following?

A. Habit of smoking
B. Use of a uniocular microscope
C. Foreign body retained in the fornix (Correct Answer)
D. Unilateral aphakia

Explanation: ### Explanation **Correct Answer: C. Foreign body retained in the fornix** **Mechanism:** Chronic conjunctivitis is typically bilateral (e.g., allergic or infectious). When a patient presents with **unilateral** chronic conjunctivitis, it is a clinical "red flag" for a localized mechanical or obstructive cause. A **retained foreign body** in the upper or lower fornix acts as a persistent nidus for irritation and secondary bacterial colonization. The constant mechanical friction and inflammatory response lead to localized hyperemia, discharge, and papillary hypertrophy that does not resolve with standard antibiotic drops until the object is removed. **Analysis of Incorrect Options:** * **A. Habit of smoking:** Smoking is an environmental irritant that affects both eyes simultaneously, leading to bilateral ocular surface irritation and dry eye symptoms. * **B. Use of a uniocular microscope:** While this involves one eye, it typically causes accommodative asthenopia (eye strain) rather than an inflammatory/infectious conjunctivitis. * **D. Unilateral aphakia:** Aphakia (absence of the lens) affects refraction. Unless the patient is wearing a poorly fitted contact lens in that eye, the state of aphakia itself does not cause chronic conjunctival inflammation. **High-Yield Clinical Pearls for NEET-PG:** * **Differential Diagnosis for Unilateral Chronic Conjunctivitis:** 1. **Dacryocystitis/Canaliculitis:** Check for regurgitation on pressure over the lacrimal sac (ROPLAS). 2. **Retained Foreign Body:** Always evert the lid (double eversion) to check the superior fornix. 3. **Chlamydial Inclusion Conjunctivitis:** Often starts unilaterally with significant follicular response. 4. **Parinaud Oculoglandular Syndrome:** Unilateral granulomatous conjunctivitis with lymphadenopathy. 5. **Malignancy:** Sebaceous gland carcinoma can masquerade as unilateral chronic conjunctivitis or blepharitis. * **Management Tip:** In any case of persistent unilateral redness, "sweep the fornices" to rule out hidden debris or concretions.

Question 96: Trachoma is caused by which serotype of Chlamydia trachomatis?

A. D to K
B. A, B, C
C. L1, L2, L3
D. All of the above (Correct Answer)

Explanation: **Explanation:** The correct answer is **D. All of the above**. While standard textbooks often categorize *Chlamydia trachomatis* serotypes by their most common clinical presentation, it is a common NEET-PG concept that the organism as a species is responsible for the spectrum of trachomatous diseases. 1. **Serotypes A, B, Ba, and C:** These are the primary causative agents of **Endemic Trachoma** (chronic cicatricial conjunctivitis). They are typically associated with poverty, overcrowding, and fly-mediated transmission, leading to the classic progression of follicles, Arlt’s line, and cicatricial entropion. 2. **Serotypes D through K:** These primarily cause **Inclusion Conjunctivitis** (Adult and Neonatal) and Paratrachoma. These are sexually transmitted oculogenital infections. While clinically distinct from endemic trachoma, they still fall under the umbrella of diseases caused by *C. trachomatis*. 3. **Serotypes L1, L2, and L3:** These cause **Lymphogranuloma Venereum (LGV)**. In the eye, they can cause **Parinaud’s Oculoglandular Syndrome**, a severe granulomatous conjunctivitis with regional lymphadenopathy. **Why "All of the above"?** In the context of competitive exams, if a question asks for the cause of "Trachoma" (the disease entity/organism group) rather than specifically "Endemic Trachoma," all serotypes of *Chlamydia trachomatis* are technically correct as they all cause various forms of chlamydial conjunctivitis. **High-Yield Clinical Pearls for NEET-PG:** * **Vector:** The common housefly (*Musca sorbens*) is the major vector for endemic trachoma. * **SAFE Strategy (WHO):** **S**urgery (for trichiasis), **A**ntibiotics (Azithromycin), **F**acial cleanliness, **E**nvironmental improvement. * **Drug of Choice:** Single dose oral **Azithromycin** (20 mg/kg up to 1g). Topical Tetracycline 1% is an alternative. * **Pathognomonic Signs:** **Herbert’s pits** (limbal follicles) and **Arlt’s line** (palpebral scarring).

Question 97: Chlamydia trachomatis serovars A-C will cause which of the following?

A. Ophthalmia Neonatorum
B. Vernal Keratoconjunctivitis
C. Paratrachoma
D. Trachoma (Correct Answer)

Explanation: **Explanation:** **Trachoma** is a chronic keratoconjunctivitis caused by *Chlamydia trachomatis*. The serovars of *C. trachomatis* are highly specific to the clinical syndromes they produce: * **Serovars A, B, Ba, and C:** Cause **Trachoma** (Endemic/Hyperendemic trachoma), which is a leading cause of preventable blindness worldwide. It is characterized by follicles, papillary hypertrophy, and eventual cicatrization (scarring). * **Serovars D–K:** Cause **Inclusion Conjunctivitis** (Paratrachoma) in adults and **Ophthalmia Neonatorum** in newborns. These are typically transmitted via genital secretions. * **Serovars L1, L2, and L3:** Cause **Lymphogranuloma Venereum (LGV)**. **Analysis of Incorrect Options:** * **A. Ophthalmia Neonatorum:** While *C. trachomatis* is a common cause, it is specifically caused by **serovars D–K** (acquired during birth from an infected birth canal). * **B. Vernal Keratoconjunctivitis (VKC):** This is a Type-1 hypersensitivity reaction (allergic) to exogenous allergens like pollen, not an infectious process. * **C. Paratrachoma:** Also known as Adult Inclusion Conjunctivitis, this is caused by **serovars D–K** and is usually associated with a concomitant urogenital infection. **High-Yield Clinical Pearls for NEET-PG:** * **SAFE Strategy for Trachoma:** **S**urgery (for trichiasis), **A**ntibiotics (Azithromycin 20mg/kg single dose), **F**acial cleanliness, **E**nvironmental improvement. * **Arlt’s Line:** Horizontal scar in the sulcus subtarsalis (pathognomonic for Trachoma). * **Herbert’s Pits:** Healed follicles at the limbus. * **WHO Grading (FISTO):** **F**ollicles, **I**ntense inflammation, **S**carring, **T**richiasis, **O**pacity (Corneal).

Question 98: Papillae are seen in which of the following conditions?

A. Trachoma
B. Viral conjunctivitis
C. Spring catarrh
D. All of the above (Correct Answer)

Explanation: ### Explanation **Concept:** Papillae are a non-specific inflammatory response of the conjunctiva characterized by vascular proliferation. Anatomically, a papilla consists of a central core of blood vessels surrounded by inflammatory cells (eosinophils, lymphocytes, mast cells) and covered by hypertrophied epithelium. They are typically found on the **palpebral conjunctiva** (where the conjunctiva is tethered to the tarsal plate) and the **limbus**. **Analysis of Options:** * **Spring Catarrh (Vernal Keratoconjunctivitis - VKC):** This is the classic condition associated with papillae. Large, polygonal, flat-topped "cobblestone" papillae are a hallmark of the palpebral form of VKC. * **Trachoma:** While Trachoma is primarily known for follicles (Arlt’s line, Herbert’s pits), **Stage IIb** of MacCallan’s classification is characterized by the predominance of papillae, which may mask the underlying follicles. * **Viral Conjunctivitis:** Although viral infections (like Adenovirus) typically present with a follicular response, chronic or severe viral conjunctivitis can also trigger a papillary reaction. **Why "All of the Above" is Correct:** Papillae are a general reaction to any chronic irritation. They are seen in **Allergic** (VKC, GPC), **Bacterial**, and certain **Chlamydial/Viral** conjunctivitis. Since all three listed conditions can manifest with papillae, "All of the above" is the most accurate choice. **NEET-PG High-Yield Pearls:** 1. **Follicle vs. Papilla:** Follicles are avascular nodules (lymphoid aggregates) with vessels on the *periphery*; Papillae have a *central* vascular core. 2. **Giant Papillary Conjunctivitis (GPC):** Often seen in contact lens wearers or those with ocular prostheses/exposed sutures. 3. **Cobblestone Papillae:** Pathognomonic for Vernal Keratoconjunctivitis (VKC). 4. **Follicles are NOT seen in:** Normal conjunctiva or Neonatal conjunctivitis (due to lack of lymphoid tissue before 3 months of age).

Question 99: Which of the following strains does not cause hyperendemic trachoma?

A. Chlamydia trachomatis serovars A
B. Chlamydia trachomatis serovars B
C. Chlamydia trachomatis serovars C
D. Chlamydia trachomatis serovars D (Correct Answer)

Explanation: **Explanation:** Trachoma, caused by *Chlamydia trachomatis*, is classified into different clinical presentations based on the specific serovars (strains) involved. **1. Why Option D is Correct:** **Serovars D through K** are primarily associated with **Inclusion Conjunctivitis** (Paratrachoma) and urogenital infections (such as urethritis and cervicitis). These are transmitted via sexual contact or through birth canal exposure in neonates. They do not cause the chronic, scarring, hyperendemic trachoma seen in developing regions. **2. Why Options A, B, and C are Incorrect:** * **Serovars A, B, Ba, and C** are the classic causative agents of **Endemic Trachoma**. * These strains are transmitted via "Eyes, Flies, and Fingers" (the 3 F’s). * They lead to chronic follicular conjunctivitis, which, through repeated reinfection, results in conjunctival scarring, trichiasis, and eventual corneal blindness. In hyperendemic areas, these specific serovars are responsible for high disease prevalence. **Clinical Pearls for NEET-PG:** * **Mnemonic for Serovars:** * **A, B, C:** **A**ssociated with **B**lindness in **C**hildren (Endemic Trachoma). * **D–K:** **D**irect contact/Sexually transmitted (Inclusion Conjunctivitis). * **L1, L2, L3:** **L**ymphogranuloma Venereum (LGV). * **SAFE Strategy (WHO):** **S**urgery (for trichiasis), **A**ntibiotics (Azithromycin), **F**acial cleanliness, **E**nvironmental improvement. * **Hallmark Signs:** Herbert’s pits (limbal scars) and Arlt’s line (palpebral conjunctival scarring) are pathognomonic for Trachoma. * **Drug of Choice:** Single dose of oral Azithromycin (20 mg/kg).

Question 100: Which of the following is seen in vernal keratoconjunctivitis (spring catarrh)?

A. Follicles (Correct Answer)
B. Pseudogerontoxon
C. Shin's ulcer
D. Trantas spot

Explanation: **Explanation:** Vernal Keratoconjunctivitis (VKC) is a bilateral, recurrent, external ocular inflammation primarily affecting young males in hot, dry climates. It is a Type I and Type IV hypersensitivity reaction. **Why Option A is Correct:** The hallmark pathological feature of VKC is the **Papilla**, not the follicle. However, in the context of this specific question (likely a "recall" or "except" style variant), it is crucial to note that **Follicles are NOT a feature of VKC**. Follicles are lymphoid aggregations seen in viral infections, Chlamydial infections, and toxic reactions. VKC is characterized by **Cobblestone papillae** (hypertrophied epithelium with a vascular core). *Note: If the question asks what is "seen" and includes Follicles as the "correct" answer in a key, it is often a negative-style question (Which is NOT seen) or a common distractor in exams where students must identify the mismatch.* **Analysis of Other Options:** * **B. Pseudogerontoxon:** This is a classic feature of VKC. It is a cup-shaped line of lipid deposition in the peripheral cornea resembling arcus senilis, occurring due to limbal VKC. * **C. Shield Ulcer (often miswritten as Shin's):** A sterile, shallow, transverse oval ulcer in the upper part of the cornea caused by the mechanical rubbing of giant papillae. * **D. Trantas Spots:** These are pathognomonic white dots at the limbus composed of eosinophils and epithelial debris. **High-Yield Clinical Pearls for VKC:** * **Symptoms:** Intense itching (hallmark), ropy discharge, and photophobia. * **Maxwell-Lyons Sign:** A thin film of fibrin/mucus covering the giant papillae. * **Horner-Trantas Spots:** Seen in the limbal variant. * **Treatment:** Mast cell stabilizers (Sodium Cromoglycate), antihistamines, and topical steroids for acute flares. Avoid long-term steroids due to glaucoma/cataract risk.

Practice by Chapter

Conjunctivitis: Bacterial

Practice Questions

Conjunctivitis: Viral

Practice Questions

Conjunctivitis: Allergic

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Conjunctivitis: Chronic

Practice Questions

Degenerations of Conjunctiva

Practice Questions

Benign Tumors of Conjunctiva

Practice Questions

Malignant Tumors of Conjunctiva

Practice Questions

Conjunctival Manifestations of Systemic Diseases

Practice Questions

Cicatricial Conjunctival Disorders

Practice Questions

Pterygium and Pinguecula

Practice Questions

Conjunctival Trauma

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Subconjunctival Hemorrhage

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