Diseases of the Conjunctiva Practice Questions

Q: Inclusion body conjunctivitis is true in all except?

Present only in infants. **Explanation:** Inclusion body conjunctivitis is caused by **Chlamydia trachomatis** (serotypes D-K). The question asks for the "except" statement, making **Option B** the correct answer because the disease is **not** exclusive to infants. 1. **Why Option B is correct (The "Except"):** Inclusion conjunctivitis occurs in two distinct clinical forms: * **Neonatal Inclusion Conjunctivitis (Ophthalmia Neonatorum):** Affects newborns. * **Adult Inclusion Conjunctivitis (AIC):** Affects sexually active young adults via autoinoculation from genital secretions. Therefore, saying it is "present only in infants" is factually incorrect. 2. **Analysis of other options:** * **Option A (Self-limiting):** While medical treatment (Azithromycin or Erythromycin) is standard to prevent complications and clear the reservoir, the conjunctivitis itself is often chronic but can eventually be self-limiting over several months. * **Option C (Passage through birth canal):** In neonates, the infection is acquired during delivery when the infant comes into contact with the infected cervix of the mother. * **Option D (Caused by Chlamydia):** It is caused by *Chlamydia trachomatis* (obligate intracellular bacterium), specifically serotypes D through K. **High-Yield Clinical Pearls for NEET-PG:** * **Incubation Period:** 5–14 days (distinguishes it from Gonococcal conjunctivitis, which appears within 2–5 days). * **Clinical Feature:** In adults, it presents as **follicular conjunctivitis** (inferior fornix). In neonates, follicles are absent initially because the conjunctival lymphoid tissue is not developed until 3–6 weeks of age. * **Cytology:** Diagnosis is confirmed by identifying **Halberstaedter-Prowazek (HP) inclusion bodies** (intracytoplasmic) on Giemsa stain. * **Treatment:** Oral Erythromycin for infants (to prevent chlamydial pneumonia) and Azithromycin (1g single dose) for adults and their sexual partners.

Q: "Shield ulcers" are seen in which of the following conditions?

Vernal keratoconjunctivitis. **Explanation:** **Vernal Keratoconjunctivitis (VKC)**, also known as "Spring Catarrh," is a bilateral, recurrent, seasonal allergic inflammation of the conjunctiva, typically affecting young boys. **Why the correct answer is right:** **Shield Ulcers** are a classic, high-yield complication of the palpebral form of VKC. They occur due to the mechanical rubbing of large, hard "cobblestone" papillae (found on the upper tarsal conjunctiva) against the corneal epithelium. This mechanical trauma, combined with the release of inflammatory mediators (like Major Basic Protein from eosinophils), prevents epithelial healing, resulting in a characteristic **transverse, oval, sterile, indolent ulcer** in the upper part of the cornea. **Why the incorrect options are wrong:** * **Granulomatous conjunctivitis:** Characterized by localized nodules (granulomas) and lymphadenopathy (e.g., Parinaud Oculoglandular Syndrome), not corneal ulceration. * **Phlyctenular keratoconjunctivitis:** Presents with **Phlyctens** (small, pinkish-white nodules) at the limbus, caused by a Type IV hypersensitivity to endogenous antigens like Tubercular protein. * **Angular conjunctivitis:** Caused by *Moraxella lacunata*, it presents with excoriation of the skin at the inner and outer canthi, not shield ulcers. **NEET-PG High-Yield Pearls for VKC:** 1. **Trantas Dots:** White chalky dots at the limbus (eosinophil aggregates). 2. **Cobblestone/Pavement Stone Papillae:** Large papillae on the superior tarsal conjunctiva. 3. **Maxwell-Lyons Sign:** Ropey, tenacious discharge. 4. **Treatment:** Mast cell stabilizers (Prophylaxis), Topical Steroids (Acute phase), and Cyclosporine (Steroid-sparing).

Q: Sequelae of Trachoma are all EXCEPT:

Ectropion. **Explanation:** Trachoma, caused by *Chlamydia trachomatis* (serotypes A, B, Ba, and C), is a chronic keratoconjunctivitis characterized by follicular hypertrophy and subsequent cicatrization (scarring). **Why Ectropion is the correct answer:** The hallmark of cicatricial trachoma is the scarring of the palpebral conjunctiva (Arlt’s line). This fibrosis causes the eyelid margin to pull inward toward the globe, leading to **Entropion** (specifically cicatricial entropion). **Ectropion** (outward turning of the lid) is not a feature of trachoma; in fact, the disease process does the exact opposite by shortening the posterior lamella of the eyelid. **Analysis of other options:** * **Entropion:** As mentioned, subconjunctival fibrosis leads to the inward turning of the lid margin. This often leads to trichiasis (misdirected lashes), which is a major cause of blindness in trachoma. * **Corneal vascularization:** Chronic inflammation leads to the formation of a **Pannus** (vascularization with infiltration), typically starting at the upper limbus. * **Pinguecula:** While pinguecula is a degenerative condition of the conjunctiva related to UV exposure, it is frequently listed in differential diagnoses or as a distractor. However, in the context of this specific question, **Ectropion** is the definitive "Except" because the pathology of trachoma strictly dictates an inward, not outward, lid deformity. (Note: Some texts also consider Xerosis and Trichiasis as primary sequelae). **High-Yield Clinical Pearls for NEET-PG:** * **WHO SAFE Strategy:** **S**urgery (for trichiasis), **A**ntibiotics (Azithromycin), **F**acial cleanliness, **E**nvironmental improvement. * **Herbert’s Pits:** Pathognomonic clinical sign representing scarred follicles at the limbus. * **Arlt’s Line:** Horizontal scar in the sulcus subtarsalis. * **Drug of Choice:** Single dose of oral Azithromycin (20 mg/kg).

Q: Trachoma is characterized by the presence of which of the following?

Follicles in palpebral conjunctiva. **Explanation:** Trachoma, caused by *Chlamydia trachomatis* (serotypes A, B, Ba, and C), is a chronic keratoconjunctivitis characterized by a follicular response. **Why Option B is Correct:** The hallmark of Trachoma is the presence of **follicles in the upper palpebral (tarsal) conjunctiva**. These follicles are subepithelial lymphoid aggregations. In the WHO grading system (FISTO), "Trachomatous inflammation—Follicular (TF)" is defined by the presence of five or more follicles (at least 0.5 mm in diameter) in the upper tarsal conjunctiva. **Analysis of Incorrect Options:** * **Option A:** Follicles are not typically found "over" the cornea. However, limbal follicles can occur, which upon healing leave behind pathognomonic shallow depressions known as **Herbert’s pits**. * **Option C & D:** While the bulbar conjunctiva may show congestion, it is not the primary site for follicle or papillae formation in Trachoma. The disease predominantly targets the superior tarsal plate. **High-Yield Clinical Pearls for NEET-PG:** * **Arlt’s Line:** Horizontal scarring in the upper tarsal conjunctiva (seen in the Cicatricial stage). * **Herbert’s Pits:** Scarred limbal follicles; pathognomonic for Trachoma. * **SAFE Strategy:** Recommended by WHO for control (**S**urgery, **A**ntibiotics—Azithromycin, **F**acial cleanliness, **E**nvironmental improvement). * **Vector:** The common housefly (*Musca sorbens*). * **Pannus:** Trachomatous pannus is typically **progressive and superior** (vascularization and infiltration of the upper cornea).

Q: What is true about chalazion?

Lipogranulomatous inflammation. ### Explanation **Correct Answer: B. Lipogranulomatous inflammation** A **Chalazion** (also known as a Meibomian cyst) is a chronic inflammatory lesion caused by the obstruction of the **Meibomian glands** (modified sebaceous glands). When the duct is blocked, the lipid secretions (sebum) leak into the surrounding tarsal stroma. Since these lipids are perceived as foreign material by the body, they trigger a **Type IV hypersensitivity reaction**, specifically a **granulomatous response**. Histologically, this is characterized by a "lipogranuloma"—a collection of epithelioid cells, multinucleated giant cells, and lymphocytes surrounding clear lipid spaces. **Why other options are incorrect:** * **A. Chronic non-specific inflammation:** While a chalazion is chronic, it is **specific** in its histological presentation (granulomatous), not non-specific. * **C & D. Acute/Suppurative inflammation:** These terms describe a **Hordeolum** (Stye). An Internal Hordeolum is an acute staphylococcal infection of the Meibomian gland, characterized by pus formation (suppuration) and pain. A chalazion is typically painless and non-infectious. **High-Yield Clinical Pearls for NEET-PG:** * **Clinical Presentation:** A painless, firm, non-tender nodule away from the lid margin. * **Treatment:** Small ones may resolve spontaneously; larger ones require **Incision and Curettage (I&C)**. The incision is made **vertically** (transconjunctival) to avoid damaging adjacent Meibomian glands. * **Recurrence:** Recurrent chalazion in the same location in elderly patients should be biopsied to rule out **Sebaceous Gland Carcinoma**. * **Association:** Frequently associated with Acne Rosacea or Seborrheic Dermatitis.

Q: Phlyctenular conjunctivitis is associated with which of the following conditions?

Tuberculosis. **Explanation:** **Phlyctenular Keratoconjunctivitis** is a localized **Type IV (delayed) hypersensitivity reaction** of the conjunctiva and cornea to endogenous microbial proteins to which the tissues have become sensitized. **1. Why Tuberculosis is Correct:** Historically and clinically, the most common cause of phlyctenular conjunctivitis is a hypersensitivity to **Tuberculoprotein**. It is frequently seen in children with active or latent primary tuberculosis. In modern clinical practice, especially in developed regions, **Staphylococcal proteins** (associated with chronic blepharitis) are also a leading cause, but for the purpose of the NEET-PG exam, **Tuberculosis** remains the classic and most frequently tested association. **2. Why the Other Options are Incorrect:** * **Syphilis:** While syphilis can cause various ocular manifestations (like interstitial keratitis or uveitis), it is not typically associated with the phlyctenular hypersensitivity reaction. * **Stevens-Johnson Syndrome:** This is a Type III/IV hypersensitivity reaction to drugs, characterized by extensive mucosal sloughing and symblepharon, rather than localized nodular phlyctenules. * **Leprosy:** Ocular leprosy commonly presents with lagophthalmos, episcleritis, or iris atrophy, but not phlyctenular disease. **3. High-Yield Clinical Pearls for NEET-PG:** * **The Phlyctenule:** A characteristic pinkish-white nodule surrounded by a zone of hyperemia, usually near the limbus. * **Fascicular Ulcer:** If the phlyctenule migrates across the cornea, it carries a leash of blood vessels behind it, forming a "wandering" or fascicular ulcer. * **Management:** Treatment involves topical steroids to control the inflammation, but it is mandatory to **rule out systemic TB** (via Mantoux test and Chest X-ray) and treat the underlying infection.

Q: A stye is an acute suppurative infection of which of the following?

Gland of Zeis. **Explanation:** A **Stye (Hordeolum Externum)** is an acute, focal, suppurative inflammation of the eyelash follicle and its associated glands. It is most commonly caused by *Staphylococcus aureus*. **1. Why Option A is Correct:** The infection specifically involves the **Glands of Zeis** (sebaceous glands) or the **Glands of Moll** (modified sweat glands) located at the lid margin. Because these glands are superficial and associated with the lashes, the resulting abscess points outward on the skin surface of the lid margin. **2. Why the other options are incorrect:** * **Option B (Meibomian gland):** Inflammation of the Meibomian glands leads to a **Hordeolum Internum** (if acute/suppurative) or a **Chalazion** (if chronic/granulomatous). Unlike a stye, a Hordeolum Internum points toward the conjunctival side (tarsal plate) rather than the skin. * **Option C (Both):** This is incorrect because a "stye" specifically refers to the external variety involving Zeis/Moll glands, not the internal Meibomian glands. * **Option D (Lacrimal gland):** Inflammation of the lacrimal gland is termed **Dacryoadenitis**, which typically presents with pain and swelling in the outer upper eyelid (S-shaped deformity). **High-Yield Clinical Pearls for NEET-PG:** * **Hordeolum Externum (Stye):** Gland of Zeis/Moll; points **outward**. * **Hordeolum Internum:** Meibomian gland; points **inward**. * **Chalazion:** Chronic, non-tender, sterile lipogranulomatous inflammation of the **Meibomian gland**. * **Treatment:** Most styes are self-limiting; managed with warm compresses and topical antibiotics. If pointing occurs, evacuation of pus by pulling the affected eyelash is effective.

Q: Pterygium is defined as:

A connective tissue degeneration. **Explanation:** **Pterygium** is a wing-shaped, fibrovascular encroachment of the bulbar conjunctiva onto the cornea. The core pathology is **elastotic degeneration** of the subepithelial connective tissue. 1. **Why Option B is Correct:** Histopathologically, pterygium is characterized by the proliferation of vascularized granulation tissue and, most importantly, the **degeneration of collagen** fibers. These fibers undergo "elastotic" changes (becoming thick, wavy, and curled), though they are not true elastic fibers. This connective tissue breakdown is primarily triggered by chronic exposure to **Ultraviolet (UV) light**, leading to the activation of matrix metalloproteinases. 2. **Why Other Options are Incorrect:** * **Option A:** While pterygium is highly vascular, it is not a primary vascular anomaly (like a hemangioma). The vascularity is secondary to the degenerative fibroblastic process. * **Option C:** Although it may appear red and "inflamed" when irritated (Stocking’s line may be present), it is fundamentally a degenerative process, not a primary inflammatory disease. * **Option D:** Vitamin A deficiency is associated with **Bitot’s spots** and Xerophthalmia, not pterygium. **High-Yield Clinical Pearls for NEET-PG:** * **Location:** Usually nasal (due to light reflection from the nose onto the nasal limbus). * **Stocking’s Line:** An iron deposition line seen on the corneal epithelium anterior to the head of the pterygium (indicates stability). * **Fuchs’ Islets:** Small, greyish-white opacities at the head of the pterygium. * **Treatment of Choice:** Surgical excision with **Limbal Conjunctival Autograft (CAG)** is the gold standard to prevent recurrence. * **Pseudopterygium:** Differentiated by the **"Probe Test"** (a probe can be passed under the neck of a pseudopterygium, but not a true pterygium).

Question 1

Inclusion body conjunctivitis is true in all except?

Accepted Answer

Present only in infants

Answer

Self-limiting

Answer

Occurs during passage through the birth canal

Answer

Caused by Chlamydia

Question 2

Hemorrhagic conjunctivitis commonly occurs with which of the following agents?

Accepted Answer

Herpes simplex

Answer

Herpes zoster

Answer

Enterovirus

Answer

Picornavirus

Question 3

"Shield ulcers" are seen in which of the following conditions?

Accepted Answer

Vernal keratoconjunctivitis

Answer

Granulomatous conjunctivitis

Answer

Phlyctenular keratoconjunctivitis

Answer

Angular conjunctivitis

Question 4

Sequelae of Trachoma are all EXCEPT:

Accepted Answer

Ectropion

Answer

Entropion

Answer

Pinguecula

Answer

Corneal vascularization

Question 5

Preauricular lymph nodes may be enlarged in all conditions except:

Accepted Answer

Allergic conjunctivitis

Answer

Bacterial conjunctivitis

Answer

Viral conjunctivitis

Answer

Chlamydial conjunctivitis

Question 6

Trachoma is characterized by the presence of which of the following?

Accepted Answer

Follicles in palpebral conjunctiva

Answer

Follicles over the cornea

Answer

Follicles in bulbar conjunctiva

Answer

Papillae in bulbar conjunctiva

Question 7

What is true about chalazion?

Accepted Answer

Lipogranulomatous inflammation

Answer

Chronic non-specific inflammation

Answer

Acute inflammation

Answer

Suppurative inflammation

Question 8

Phlyctenular conjunctivitis is associated with which of the following conditions?

Accepted Answer

Tuberculosis

Answer

Syphilis

Answer

Stevens Johnson syndrome

Answer

Leprosy

Question 9

A stye is an acute suppurative infection of which of the following?

Accepted Answer

Gland of Zeis

Answer

Meibomian gland

Answer

Both

Answer

Lacrimal gland

Question 10

Pterygium is defined as:

Accepted Answer

A connective tissue degeneration

Answer

A vascular anomaly

Answer

An inflammatory condition

Answer

Associated with Vitamin A deficiency

Diseases of the Conjunctiva — MCQs

Diseases of the Conjunctiva — MCQs

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