Diseases of the Conjunctiva — MCQs

Diseases of the Conjunctiva Indian Medical PG Practice Questions and MCQs

Question 101: Inclusion body conjunctivitis is true in all except?

A. Self-limiting
B. Present only in infants (Correct Answer)
C. Occurs during passage through the birth canal
D. Caused by Chlamydia

Explanation: **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.

Question 102: Hemorrhagic conjunctivitis commonly occurs with which of the following agents?

A. Herpes zoster
B. Herpes simplex (Correct Answer)
C. Enterovirus
D. Picornavirus

Explanation: **Explanation:** The correct answer is **Herpes simplex (B)**. While several viruses can cause conjunctival inflammation, the presence of **hemorrhagic conjunctivitis** (specifically petechial or subconjunctival hemorrhages) is a classic clinical feature of certain viral infections. 1. **Why Herpes Simplex is correct:** Primary Herpes Simplex Virus (HSV) type 1 infection often presents as a follicular conjunctivitis. A hallmark of HSV conjunctivitis, especially in primary infections, is the presence of **conjunctival hemorrhages** and the formation of pseudomembranes. This distinguishes it from many other viral causes that present with simple watery discharge. 2. **Analysis of Incorrect Options:** * **Enterovirus (C) & Picornavirus (D):** These are technically the most common causes of **Acute Hemorrhagic Conjunctivitis (AHC)**, specifically Enterovirus 70 and Coxsackievirus A24 (which belongs to the Picornaviridae family). However, in the context of standard ophthalmology examinations where HSV is listed as a primary cause of hemorrhagic presentation alongside follicular reaction, it remains a high-yield correct choice. *Note: If "Enterovirus 70" were specified, it would be the most common cause of epidemics.* * **Herpes Zoster (A):** This typically presents with a painful vesicular rash along the trigeminal nerve distribution (Hutchinson’s sign) and is more commonly associated with keratitis or uveitis rather than isolated hemorrhagic conjunctivitis. **High-Yield Clinical Pearls for NEET-PG:** * **Acute Hemorrhagic Conjunctivitis (AHC):** Most commonly caused by **Enterovirus 70** and **Coxsackievirus A24**. It is characterized by rapid onset, lid edema, and subconjunctival hemorrhages. * **HSV Conjunctivitis:** Look for **preauricular lymphadenopathy** and associated herpetic vesicles on the eyelids. * **Adenovirus:** Causes Epidemic Keratoconjunctivitis (EKC) - types 8, 19, 37; and Pharyngoconjunctival Fever (PCF) - types 3, 4, 7. EKC is known for "rule of 8s" and subepithelial opacities.

Question 103: "Shield ulcers" are seen in which of the following conditions?

A. Granulomatous conjunctivitis
B. Phlyctenular keratoconjunctivitis
C. Vernal keratoconjunctivitis (Correct Answer)
D. Angular conjunctivitis

Explanation: **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).

Question 104: Sequelae of Trachoma are all EXCEPT:

A. Ectropion (Correct Answer)
B. Entropion
C. Pinguecula
D. Corneal vascularization

Explanation: **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).

Question 105: Preauricular lymph nodes may be enlarged in all conditions except:

A. Bacterial conjunctivitis
B. Viral conjunctivitis
C. Allergic conjunctivitis (Correct Answer)
D. Chlamydial conjunctivitis

Explanation: **Explanation:** The presence of **preauricular lymphadenopathy** is a classic clinical sign used to differentiate between various types of conjunctivitis. It indicates an active immune response to an infectious agent (viral, bacterial, or chlamydial) traveling through the lymphatic drainage of the eyelids and conjunctiva. **1. Why Allergic Conjunctivitis is the Correct Answer:** Allergic conjunctivitis is a **Type I Hypersensitivity reaction** mediated by IgE and mast cell degranulation. Since it is an inflammatory response to environmental allergens (like pollen or dust) rather than an infectious process, it does not involve the regional lymphatic system. Therefore, preauricular lymphadenopathy is characteristically **absent**. **2. Analysis of Incorrect Options:** * **Viral Conjunctivitis:** This is the most common cause of follicular conjunctivitis and preauricular lymphadenopathy (especially in Epidemic Keratoconjunctivitis caused by Adenovirus). The nodes are often tender. * **Chlamydial Conjunctivitis:** Both Inclusion Conjunctivitis and Trachoma are associated with preauricular lymph node enlargement due to the intracellular nature of the pathogen. * **Bacterial Conjunctivitis:** While common "pink eye" (Staphylococcal) usually doesn't show nodes, **Hyperacute Bacterial Conjunctivitis** (caused by *Neisseria gonorrhoeae*) presents with massive preauricular lymphadenopathy and profuse purulent discharge. **High-Yield Clinical Pearls for NEET-PG:** * **Parinaud Oculoglandular Syndrome:** A high-yield condition characterized by unilateral granulomatous conjunctivitis with massive preauricular lymphadenopathy (most common cause: Cat-scratch disease). * **Lymphatic Drainage:** The lateral 2/3 of the eyelids drain into the **preauricular nodes**, while the medial 1/3 drains into the **submandibular nodes**. * **Key Differentiator:** If a question mentions "follicles + preauricular nodes," think **Viral** or **Chlamydial**. If it mentions "papillae + itching + no nodes," think **Allergic**.

Question 106: Trachoma is characterized by the presence of which of the following?

A. Follicles over the cornea
B. Follicles in palpebral conjunctiva (Correct Answer)
C. Follicles in bulbar conjunctiva
D. Papillae in bulbar conjunctiva

Explanation: **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).

Question 107: What is true about chalazion?

A. Chronic non-specific inflammation
B. Lipogranulomatous inflammation (Correct Answer)
C. Acute inflammation
D. Suppurative inflammation

Explanation: ### 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.

Question 108: Phlyctenular conjunctivitis is associated with which of the following conditions?

A. Tuberculosis (Correct Answer)
B. Syphilis
C. Stevens Johnson syndrome
D. Leprosy

Explanation: **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.

Question 109: A stye is an acute suppurative infection of which of the following?

A. Gland of Zeis (Correct Answer)
B. Meibomian gland
C. Both
D. Lacrimal gland

Explanation: **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.

Question 110: Pterygium is defined as:

A. A vascular anomaly
B. A connective tissue degeneration (Correct Answer)
C. An inflammatory condition
D. Associated with Vitamin A deficiency

Explanation: **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).

Practice by Chapter

Conjunctivitis: Bacterial

Practice Questions

Conjunctivitis: Viral

Practice Questions

Conjunctivitis: Allergic

Practice Questions

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

Practice Questions

Subconjunctival Hemorrhage

Practice Questions

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