Diseases of the Conjunctiva — MCQs

Diseases of the Conjunctiva Indian Medical PG Practice Questions and MCQs

Question 231: Which of the following is FALSE regarding phlyctenular conjunctivitis?

A. The most common cause is tuberculosis. (Correct Answer)
B. The lesions are typically found near the limbus.
C. Predominantly affects children.
D. Is a type IV hypersensitivity reaction.

Explanation: **Explanation:** Phlyctenular keratoconjunctivitis is an **endogenous microbial allergic reaction** of the conjunctiva and cornea to a foreign protein. **1. Why Option A is the correct (False) statement:** While **Tuberculosis** was historically the most common cause worldwide, in the modern era and specifically in the context of current medical literature, **Staphylococcal proteins** (associated with chronic blepharitis) are now considered the **most common cause** of phlyctenular conjunctivitis. Tuberculosis remains an important cause in developing countries, but it is no longer the "most common" globally. **2. Analysis of other options:** * **Option B (True):** The classic lesion, a "phlycten" (a pinkish-white nodule), is most commonly located at or near the **limbus**. It can also occur on the bulbar conjunctiva or the cornea. * **Option C (True):** This condition predominantly affects **children and young adults** (usually between 5–15 years of age), often those living in overcrowded or unsanitary conditions. * **Option D (True):** It is a classic example of a **Type IV (Delayed) Hypersensitivity reaction** to bacterial proteins (Staphylococcus, Mycobacterium tuberculosis, Moraxella axenfeldii, etc.). **Clinical Pearls for NEET-PG:** * **Symptoms:** Intense itching, lacrimation, and photophobia (photophobia is severe if the cornea is involved). * **Fascicular Ulcer:** A characteristic "serpiginous" corneal ulcer formed when a limbal phlycten migrates towards the center of the cornea, carrying a leash of blood vessels behind it. * **Treatment:** Topical steroids (to control the allergic reaction) and treatment of the underlying cause (e.g., lid hygiene for blepharitis or systemic workup for TB).

Question 232: Which of the following are seen in trachoma?

A. Papillary hypertrophy
B. Follicles
C. Panus formation
D. All of the above (Correct Answer)

Explanation: Trachoma, caused by **Chlamydia trachomatis (serotypes A, B, Ba, and C)**, is a chronic keratoconjunctivitis characterized by a mixed inflammatory response. It is a leading cause of preventable blindness worldwide. **Explanation of the Correct Answer:** The correct answer is **All of the above** because Trachoma involves both the conjunctiva and the cornea through a specific pathological progression: * **Follicles (Option B):** These are the hallmark of active trachoma, typically seen on the upper tarsal conjunctiva. They represent subepithelial lymphoid aggregations. * **Papillary Hypertrophy (Option A):** This is a non-specific inflammatory response where the conjunctiva becomes red and velvety due to vascular proliferation. In trachoma, papillae often coexist with follicles (predominantly in the upper tarsus). * **Pannus Formation (Option C):** This refers to inflammatory vascularization and infiltration of the superior cornea. It is a classic sign of trachomatous keratitis. **Why other options are not selected individually:** While A, B, and C are all characteristic features, selecting any single one would be incomplete. Trachoma is unique because it presents with a **"Mixed Follicular-Papillary Response"** along with corneal involvement (Pannus). **High-Yield Clinical Pearls for NEET-PG:** * **Arlt’s Line:** Horizontal scarring on the upper tarsal conjunctiva (Stage IV). * **Herbert’s Pits:** Depressions on the limbus resulting from the healing of limbal follicles (Pathognomonic). * **WHO SAFE Strategy:** **S**urgery (for trichiasis), **A**ntibiotics (Azithromycin), **F**acial cleanliness, **E**nvironmental improvement. * **Drug of Choice:** Single dose of oral **Azithromycin** (20 mg/kg). * **Surgical Procedure:** Bilamellar Tarsal Rotation (for entropion/trichiasis).

Question 233: Which of the following does not cause hemorrhagic conjunctivitis?

A. Adenovirus
B. Coxsackie – 24
C. Enterovirus – 70
D. Papilloma virus (Correct Answer)

Explanation: **Explanation:** **Acute Hemorrhagic Conjunctivitis (AHC)** is a highly contagious clinical syndrome characterized by sudden onset of painful conjunctival inflammation, lid edema, and pathognomonic subconjunctival hemorrhages. **Why Papilloma Virus is the Correct Answer:** Human Papilloma Virus (HPV) is primarily associated with the formation of **conjunctival papillomas** (benign epithelial tumors). These present as pedunculated or sessile growths rather than an acute inflammatory or hemorrhagic process. It does not cause the rapid-onset follicular conjunctivitis or hemorrhages seen in AHC. **Analysis of Incorrect Options:** * **Enterovirus-70 & Coxsackie A-24:** These are the **most common causes** of epidemic outbreaks of AHC. They belong to the Picornaviridae family. They typically present with a short incubation period (12–48 hours) and "petechial" hemorrhages that rapidly coalesce. * **Adenovirus:** Specifically, **Serotypes 8, 11, and 19** are known to cause Epidemic Keratoconjunctivitis (EKC). While EKC is characterized by pseudomembranes and subepithelial infiltrates, it frequently presents with significant subconjunctival hemorrhage, making it a known cause of hemorrhagic conjunctivitis. **High-Yield Clinical Pearls for NEET-PG:** * **AHC Hallmark:** The hemorrhage usually starts in the upper bulbar conjunctiva and spreads downwards. * **Neurological Association:** Enterovirus-70 has a rare but classic association with **polio-like paralysis** (radiculomyelitis). * **Adenovirus (EKC):** Look for the "Rule of 8s"—caused by Adenovirus 8, symptoms last about 8 days, and subepithelial infiltrates appear 8 days after onset. * **Transmission:** Hand-to-eye contact and contaminated ophthalmic instruments (tonometers) are the primary routes.

Question 234: Maximum density of goblet cells is seen in which part of the conjunctiva?

A. Superior conjunctiva
B. Inferior conjunctiva
C. Nasal conjunctiva (Correct Answer)
D. Temporal conjunctiva

Explanation: **Explanation:** The conjunctival epithelium contains specialized unicellular mucous glands called **Goblet cells**. These cells are responsible for secreting the **mucin layer** of the tear film, which is essential for maintaining ocular surface wetting and stability. **Why Nasal Conjunctiva is Correct:** Histological studies have demonstrated that the distribution of goblet cells is not uniform across the ocular surface. The highest density of these cells is found in the **inferomedial (nasal) quadrant**, specifically within the **fornices** and the **semilunar fold (Plica semilunaris)**. The nasal concentration is thought to facilitate the efficient distribution of mucin toward the lacrimal lake and drainage system. **Analysis of Incorrect Options:** * **Superior and Temporal Conjunctiva:** While goblet cells are present in these areas, their concentration is significantly lower compared to the nasal and inferior regions. * **Inferior Conjunctiva:** The inferior fornix has a high density of goblet cells, but it is second to the nasal/inferomedial region. **High-Yield Clinical Pearls for NEET-PG:** * **Secretory Product:** Goblet cells secrete **MUC5AC** (a gel-forming mucin). * **Clinical Correlation:** A deficiency in goblet cells leads to **mucin deficiency dry eye**, commonly seen in conditions like **Vitamin A deficiency (Xerophthalmia)**, Stevens-Johnson Syndrome (SJS), and Trachoma. * **Bitot’s Spots:** These are triangular, foamy patches on the bulbar conjunctiva (usually temporal) caused by keratinization and a lack of goblet cells due to Vitamin A deficiency. * **Origin:** Goblet cells are derived from the basal layer of the conjunctival epithelium.

Question 235: Hemorrhagic conjunctivitis occurs with which of the following?

A. Herpes zoster
B. Herpes simplex
C. Enterovirus (Correct Answer)
D. All of the above

Explanation: **Explanation:** **Acute Hemorrhagic Conjunctivitis (AHC)** is a highly contagious, self-limiting viral infection characterized by sudden onset of ocular pain, lid edema, and prominent **subconjunctival hemorrhages**. **Why Enterovirus is Correct:** The most common causative agents for AHC are **Enterovirus 70** and **Coxsackievirus A24**. These picornaviruses are transmitted via the feco-oral route or direct contact. The hallmark of this condition is the rapid appearance of petechial hemorrhages that coalesce to involve the entire bulbar conjunctiva. It typically occurs in large-scale epidemics, especially in overcrowded or coastal areas. **Why Other Options are Incorrect:** * **Herpes Simplex Virus (HSV):** Typically causes follicular conjunctivitis associated with dendritic keratitis. While it can cause redness, it does not typically present with the diffuse, frank hemorrhages seen in AHC. * **Herpes Zoster Virus (HZV):** Presents as blepharoconjunctivitis following the distribution of the ophthalmic nerve (V1). It is characterized by vesicular skin rashes and pseudodendrites rather than acute hemorrhagic episodes. **High-Yield Clinical Pearls for NEET-PG:** * **Incubation Period:** Very short (12–48 hours). * **Neurological Association:** Enterovirus 70 is rarely associated with a polio-like **radiculomyelitis** (lower motor neuron paralysis). * **Differential Diagnosis:** Adenovirus (Serotypes 8, 11, 19) causes **Epidemic Keratoconjunctivitis (EKC)**, which presents with pseudomembranes and subepithelial opacities, but hemorrhages are less pathognomonic than in Enterovirus. * **Management:** Purely supportive; topical steroids are generally contraindicated in the acute phase.

Question 236: What is the most common congenital tumor of the conjunctiva?

A. Papilloma
B. Squamous cell carcinoma
C. Epibulbar dermoid (Correct Answer)
D. Melanoma

Explanation: **Explanation:** **Correct Answer: C. Epibulbar dermoid** **Why it is correct:** An **epibulbar dermoid** is a choristoma—a mass of histologically normal tissue (like hair follicles, sebaceous glands, and sweat glands) located in an abnormal anatomical position. It is the **most common congenital tumor** of the conjunctiva. These lesions are typically present at birth as firm, yellowish-white, solid elevated masses, most frequently located at the **inferotemporal limbus**. **Why the other options are incorrect:** * **A. Papilloma:** These are benign epithelial tumors often associated with HPV (types 6 and 11). While they can occur in children, they are acquired viral or neoplastic growths, not congenital. * **B. Squamous cell carcinoma (SCC):** This is the most common malignant tumor of the conjunctiva, but it is an acquired condition typically seen in elderly patients with significant UV exposure or immunosuppression. * **D. Melanoma:** This is a rare, life-threatening malignant tumor that usually arises from primary acquired melanosis (PAM) or a pre-existing nevus in adults. It is not congenital. **Clinical Pearls for NEET-PG:** * **Goldenhar Syndrome:** If epibulbar dermoids are bilateral or associated with preauricular skin tags and vertebral anomalies, suspect Goldenhar Syndrome (Oculo-Auriculo-Vertebral dysplasia). * **Dermolipoma:** A variant of dermoid usually found at the **outer canthus** (superotemporal quadrant); it contains significant fatty tissue. * **Management:** Small lesions are observed; surgical excision is indicated for cosmetic reasons, chronic irritation, or if it induces **astigmatism** leading to amblyopia.

Question 237: Parenchymatous xerosis of the conjunctiva is caused by which condition?

A. Trachoma (Correct Answer)
B. Vitamin A deficiency
C. Vernal catarrh
D. Phlyctenular keratoconjunctivitis

Explanation: ### Explanation **Parenchymatous xerosis** refers to dryness of the conjunctiva resulting from structural damage to the conjunctival tissue itself, specifically the loss of mucin-secreting goblet cells and the destruction of the ducts of the lacrimal and accessory lacrimal glands. **1. Why Trachoma is Correct:** Trachoma (caused by *Chlamydia trachomatis* serotypes A, B, Ba, and C) leads to chronic cicatrization (scarring) of the conjunctiva. In the late stages (Stage IV), extensive subepithelial fibrosis destroys the goblet cells and obstructs the ducts of the lacrimal glands. This leads to a permanent, structural dryness of the ocular surface known as parenchymatous xerosis. Other causes include Stevens-Johnson Syndrome, ocular cicatricial pemphigoid, and chemical burns. **2. Why Other Options are Incorrect:** * **Vitamin A Deficiency:** This causes **Epithelial xerosis**. It is a functional deficiency where the lack of Vitamin A leads to squamous metaplasia of the epithelium, but the underlying tissue structure and glands remain intact initially. It is reversible with Vitamin A supplementation. * **Vernal Catarrh (VKC):** This is an allergic condition characterized by "cobblestone" papillae and ropy discharge. It does not typically lead to parenchymatous xerosis. * **Phlyctenular Keratoconjunctivitis:** This is a type IV hypersensitivity reaction to endogenous antigens (like Tubercular protein). It presents with localized nodules (phlyctens) rather than generalized cicatricial xerosis. **High-Yield Clinical Pearls for NEET-PG:** * **Bitot’s Spots:** Pathognomonic for Vitamin A deficiency (Epithelial xerosis); usually located temporally. * **Arlt’s Line:** Horizontal scarring in the upper palpebral conjunctiva seen in Trachoma. * **Herbert’s Pits:** Scarred follicles at the limbus, diagnostic of past Trachoma. * **SAFE Strategy:** WHO-recommended management for Trachoma (Surgery, Antibiotics, Facial cleanliness, Environmental improvement).

Question 238: H.P. inclusion bodies in trachoma are seen to be:

A. Extracellular
B. Intracytoplasmic (Correct Answer)
C. Intranuclear
D. None

Explanation: **Explanation:** The correct answer is **Intracytoplasmic**. **1. Why Intracytoplasmic is Correct:** Trachoma is caused by *Chlamydia trachomatis* (serotypes A, B, Ba, and C). Chlamydia are **obligate intracellular bacteria** that undergo a unique life cycle within the host cell. After entering the conjunctival epithelial cell as an elementary body, it transforms into a reticulate body, which replicates via binary fission. These replicating clusters form large, basophilic aggregates within the **cytoplasm** of the epithelial cell, known as **Halberstaedter-Prowazek (H.P.) inclusion bodies**. These are pathognomonic for Chlamydial infections. **2. Why Other Options are Incorrect:** * **Extracellular:** Chlamydia cannot replicate outside a host cell because they are "energy parasites" (unable to synthesize their own ATP). While elementary bodies exist extracellularly to infect new cells, H.P. inclusion bodies represent the intracellular replicative phase. * **Intranuclear:** H.P. bodies are strictly cytoplasmic. Intranuclear inclusions are characteristic of viral infections like Herpes Simplex (Lipschütz bodies) or Adenovirus, not Chlamydia. **3. Clinical Pearls for NEET-PG:** * **Staining:** H.P. bodies are best visualized using **Giemsa stain** (appear blue/purple) or Iodine stain (stains the glycogen matrix). * **WHO Grading (FISTO):** Remember the stages—**F**ollicular, **I**ntense inflammation, **S**carring, **T**richiasis, and **O**pacity. * **Management:** The "SAFE" strategy (**S**urgery, **A**ntibiotics, **F**acial cleanliness, **E**nvironmental hygiene). * **Drug of Choice:** A single dose of **Azithromycin** (20 mg/kg up to 1g) is the preferred treatment.

Question 239: Which bacterium causes acute hemorrhagic conjunctivitis?

A. Staphylococcus aureus
B. Streptococcus hemolyticus
C. Pneumococcus (Correct Answer)
D. Pseudomonas

Explanation: **Explanation:** Acute Hemorrhagic Conjunctivitis (AHC) is a clinical variant of acute mucopurulent conjunctivitis characterized by the presence of multiple subconjunctival hemorrhages. **Why Pneumococcus is correct:** While AHC is most commonly caused by viruses (specifically **Enterovirus 70** and **Coxsackievirus A24**), among the bacterial causes, **Pneumococcus (*Streptococcus pneumoniae*)** is the classic culprit. It typically presents with a mucopurulent discharge and characteristic petechial or larger subconjunctival hemorrhages, often occurring in epidemic forms in temperate climates. **Analysis of Incorrect Options:** * **Staphylococcus aureus:** This is the most common cause of acute mucopurulent conjunctivitis globally. However, it typically presents with crusting of lids and a "stuck together" sensation in the morning, rather than significant subconjunctival hemorrhage. * **Streptococcus hemolyticus:** While it can cause severe conjunctivitis, it is more frequently associated with pseudomembrane formation rather than the hemorrhagic presentation typical of Pneumococcus. * **Pseudomonas:** This is a highly virulent organism associated with contact lens wear and corneal ulcers. It causes rapid liquefactive necrosis and a characteristic greenish discharge, but not primary hemorrhagic conjunctivitis. **High-Yield NEET-PG Pearls:** * **Viral Etiology:** If the question asks for the *most common* cause of AHC overall, the answer is **Enterovirus 70**. * **Clinical Sign:** Subconjunctival hemorrhages in Pneumococcal conjunctivitis are usually more prominent in the upper bulbar conjunctiva. * **Differential:** Always differentiate AHC from Epidemic Keratoconjunctivitis (EKC), which is caused by Adenovirus types 8 and 19 and presents with preauricular lymphadenopathy and corneal subepithelial infiltrates.

Question 240: Which of the following is responsible for causing ophthalmia neonatorum on 5-7th day after birth?

A. Chemical
B. Herpes Simplex Virus II (Correct Answer)
C. Neisseria gonorrhoea
D. Chlamydia trachomatis

Explanation: **Explanation:** Ophthalmia neonatorum is a form of conjunctivitis occurring within the first month of life. The diagnosis is primarily based on the **incubation period**, which is the most high-yield clinical marker for NEET-PG. **Why Herpes Simplex Virus II is correct:** HSV-II typically presents **5 to 7 days** after birth. It is characterized by generalized conjunctival hyperemia, non-purulent discharge, and often the presence of typical dendritic corneal ulcers or periorbital vesicles. It is usually transmitted during passage through an infected birth canal. **Analysis of Incorrect Options:** * **Chemical (Option A):** Occurs within the first **24 hours**. It is usually a reaction to silver nitrate (Credé's prophylaxis) and resolves spontaneously. * **Neisseria gonorrhoea (Option C):** Occurs within **2 to 5 days**. It is the most hyperacute and dangerous form, characterized by profuse purulent discharge and a high risk of corneal perforation. * **Chlamydia trachomatis (Option D):** Occurs within **5 to 14 days**. While it overlaps with HSV, it is the most common cause of ophthalmia neonatorum worldwide and typically presents with mucopurulent discharge and papillary conjunctivitis. **High-Yield Clinical Pearls for NEET-PG:** * **Timeline Summary:** Chemical (<24h) → Gonococcal (2-5d) → HSV (5-7d) → Chlamydia (5-14d). * **Treatment of Choice:** For Chlamydia, oral Erythromycin is preferred to prevent subsequent chlamydial pneumonia. For Gonococcal, systemic Ceftriaxone is mandatory. * **Prophylaxis:** 1% Silver nitrate or 0.5% Erythromycin ointment is used immediately after birth. * **Note:** Follicles are not seen in neonatal conjunctivitis because the conjunctival adenoid layer is not developed until 3 months of age.

Practice by Chapter

Conjunctivitis: Bacterial

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Conjunctivitis: Viral

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Conjunctivitis: Allergic

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Conjunctivitis: Chronic

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Degenerations of Conjunctiva

Practice Questions

Benign Tumors of Conjunctiva

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Malignant Tumors of Conjunctiva

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Conjunctival Manifestations of Systemic Diseases

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Cicatricial Conjunctival Disorders

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Pterygium and Pinguecula

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Conjunctival Trauma

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Subconjunctival Hemorrhage

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