Diseases of the Conjunctiva Practice Questions

Q: All are known to produce parenchymatous conjunctival xerosis except?

Vitamin A deficiency. ### 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**.

Q: Epidemic keratoconjunctivitis is caused by:

Adenovirus. **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.

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

Allergens can be endogenous or exogenous.. ### 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.

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

Intraocular lens. **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.

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

Trachoma. **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).

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

Chlamydia trachomatis serovars D. **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).

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

Follicles. **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.

Question 1

All are known to produce parenchymatous conjunctival xerosis except?

Accepted Answer

Vitamin A deficiency

Answer

Stevens-Johnson syndrome

Answer

Trachoma

Answer

Diphtheric membranous conjunctivitis

Question 2

Epidemic keratoconjunctivitis is caused by:

Accepted Answer

Adenovirus

Answer

Neisseria gonorrhoeae

Answer

Corynebacterium diphtheriae

Answer

Mycobacterium tuberculosis

Question 3

Which of the following is NOT true about phlyctenular conjunctivitis?

Accepted Answer

Allergens can be endogenous or exogenous.

Answer

It is a Type IV cell-mediated hypersensitivity reaction.

Answer

The incidence is higher in girls than in boys.

Answer

Nodular lesions typically occur near the limbus.

Question 4

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

Accepted Answer

Intraocular lens

Answer

Contact lens

Answer

Prosthesis

Answer

Nylon sutures

Question 5

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

Accepted Answer

Foreign body retained in the fornix

Answer

Habit of smoking

Answer

Use of a uniocular microscope

Answer

Unilateral aphakia

Question 6

Trachoma is caused by which serotype of Chlamydia trachomatis?

Accepted Answer

All of the above

Answer

D to K

Answer

A, B, C

Answer

L1, L2, L3

Question 7

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

Accepted Answer

Trachoma

Answer

Ophthalmia Neonatorum

Answer

Vernal Keratoconjunctivitis

Answer

Paratrachoma

Question 8

Papillae are seen in which of the following conditions?

Accepted Answer

All of the above

Answer

Trachoma

Answer

Viral conjunctivitis

Answer

Spring catarrh

Question 9

Which of the following strains does not cause hyperendemic trachoma?

Accepted Answer

Chlamydia trachomatis serovars D

Answer

Chlamydia trachomatis serovars A

Answer

Chlamydia trachomatis serovars B

Answer

Chlamydia trachomatis serovars C

Question 10

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

Accepted Answer

Follicles

Answer

Pseudogerontoxon

Answer

Shin's ulcer

Answer

Trantas spot

Diseases of the Conjunctiva — MCQs

Diseases of the Conjunctiva — MCQs

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