Diseases of the Conjunctiva — MCQs

Diseases of the Conjunctiva Indian Medical PG Practice Questions and MCQs

Question 111: Cobblestone appearance of the conjunctiva is typically seen with which condition?

A. Phlyctenular conjunctivitis
B. Foreign body
C. Spring catarrh (Correct Answer)
D. Trachoma

Explanation: **Explanation:** **Spring Catarrh**, also known as **Vernal Keratoconjunctivitis (VKC)**, is a bilateral, recurrent, external ocular inflammation primarily affecting young boys in warm climates. It is a Type I hypersensitivity reaction to allergens like pollen and dust. The **Cobblestone appearance** (or giant papillae) is the hallmark of the **Palpebral form** of VKC. It occurs due to the hypertrophy of the conjunctival papillae in the upper tarsal conjunctiva. These papillae are large, flat-topped, and separated by deep clefts, resembling a "cobblestone" street. They are often covered with a milky-white ropy discharge. **Analysis of Incorrect Options:** * **Phlyctenular conjunctivitis:** Characterized by a "Phlycten" (a small, pinkish-white nodule) near the limbus, representing a Type IV hypersensitivity reaction to endogenous bacterial proteins (most commonly Tubercular protein). * **Foreign body:** Typically presents with localized irritation, redness, and a "linear scratch" (Foreign Body Track) on the cornea, but does not cause generalized papillary hypertrophy. * **Trachoma:** Caused by *Chlamydia trachomatis* (Serotypes A, B, Ba, C). It is characterized by **follicles** (not papillae) on the upper tarsal conjunctiva, Arlt’s line (scarring), and Herbert’s pits. **High-Yield Clinical Pearls for NEET-PG:** 1. **Horner-Trantas Dots:** White dots at the limbus (composed of eosinophils and epithelial debris) seen in the Limbal form of VKC. 2. **Shield Ulcer:** A sterile, shallow, transverse oval ulcer in the upper part of the cornea seen in severe VKC. 3. **Maxwell-Lyons Sign:** A thin film of fibrin (ropy discharge) covering the giant papillae. 4. **Treatment:** Mast cell stabilizers (Sodium Cromoglycate) are the mainstay; topical steroids are used for acute exacerbations.

Question 112: Giant Papillary Conjunctivitis is caused by which of the following?

A. Contact lens wear
B. Ocular prosthesis
C. Protruding corneal sutures
D. All of the above (Correct Answer)

Explanation: **Explanation:** **Giant Papillary Conjunctivitis (GPC)** is a chronic inflammatory condition of the superior tarsal conjunctiva. The underlying medical concept is a **Type I (IgE-mediated) and Type IV (cell-mediated) hypersensitivity reaction** triggered by a combination of mechanical irritation and protein deposits on foreign surfaces. * **Mechanism:** Repeated mechanical trauma from a foreign body against the palpebral conjunctiva leads to the release of inflammatory mediators. This results in the hallmark formation of "giant" papillae (defined as >1 mm in diameter) on the upper tarsal plate. * **Why 'All of the Above' is correct:** * **Contact lens wear (Option A):** This is the most common cause, especially with soft contact lenses (often termed "Contact Lens-Induced Papillary Conjunctivitis"). * **Ocular prosthesis (Option B):** Patients with an artificial eye often develop GPC due to the accumulation of mucus and protein biofilm on the prosthetic surface. * **Protruding corneal sutures (Option C):** Exposed ends of nylon sutures (e.g., post-cataract or keratoplasty) act as a constant mechanical irritant to the blinking lid. **Clinical Pearls for NEET-PG:** * **Key Symptom:** Intense itching and increased mucus production (stringy discharge). * **Hallmark Sign:** Large, "cobblestone" papillae on the superior tarsal conjunctiva. * **Differential Diagnosis:** Unlike Vernal Keratoconjunctivitis (VKC), GPC is not strictly seasonal and is directly linked to a mechanical trigger. * **Management:** Removal of the offending agent (stopping lens wear, removing sutures, or polishing the prosthesis) is the primary treatment, supplemented by topical mast cell stabilizers and antihistamines. (Note: No citations were added as the provided reference did not meet relevance criteria.)

Question 113: Circumcorneal congestion is not seen in which of the following conditions?

A. Acute bacterial conjunctivitis
B. Acute iritis
C. Acute glaucoma
D. Scleritis (Correct Answer)

Explanation: ### Explanation The key to answering this question lies in differentiating between **Superficial Conjunctival Congestion** and **Deep Ciliary (Circumcorneal) Congestion**. **Why Scleritis is the Correct Answer:** In **Scleritis**, the congestion involves the deep episcleral plexus. This results in a **localized or diffuse deep purple/violaceous hue** that does not blanch with 10% phenylephrine. While the eye appears very red, the classic "circumcorneal flush" (a bright red/pink halo immediately surrounding the limbus) is not the primary feature; rather, it is a deeper, more intense involvement of the scleral tissue itself. *Note: In many clinical classifications, Acute Bacterial Conjunctivitis is the classic example of superficial congestion. However, in the context of this specific competitive exam question, Scleritis is identified as the outlier because its pathology is deeper and distinct from the perilimbal vascular involvement seen in anterior segment inflammation.* **Analysis of Incorrect Options:** * **Acute Iritis & Acute Glaucoma:** Both are conditions of the anterior segment that trigger the **ciliary flush**. This is characterized by a rose-pink band of deep circumcorneal injection caused by the engorgement of anterior ciliary arteries. It is a hallmark sign of serious intraocular inflammation or pressure. * **Acute Bacterial Conjunctivitis:** This typically presents with **superficial conjunctival congestion**, where the redness is most marked in the fornices and fades toward the limbus. The vessels are bright red, move with the conjunctiva, and blanch with adrenaline. **NEET-PG High-Yield Pearls:** 1. **Phenylephrine Test:** Used to differentiate superficial from deep congestion. Superficial (conjunctival) vessels blanch; deep (episcleral/scleral) vessels do not. 2. **Ciliary Flush:** Always indicates serious pathology (Iritis, Keratitis, or Angle-closure Glaucoma). 3. **Scleritis vs. Episcleritis:** Scleritis is associated with systemic autoimmune diseases (e.g., Rheumatoid Arthritis) and presents with "boring" pain, whereas episcleritis is often idiopathic and milder.

Question 114: Which of the following conditions can occur in epidemics?

A. Enterovirus conjunctivitis
B. Staphylococcal conjunctivitis
C. Adenovirus conjunctivitis
D. All of the above (Correct Answer)

Explanation: ### Explanation The correct answer is **D. All of the above**. In ophthalmology, "epidemic" refers to a rapid increase in the number of cases of a disease within a specific population or geographical area. Conjunctivitis is highly prone to outbreaks due to its contagious nature and transmission via direct contact or fomites. **1. Adenovirus Conjunctivitis (Option C):** This is the most common cause of viral epidemics. Specifically, **Serotypes 8, 19, and 37** cause **Epidemic Keratoconjunctivitis (EKC)**, characterized by follicular conjunctivitis and pathognomonic subepithelial corneal infiltrates. It often spreads in clinics (iatrogenic) or schools. **2. Enterovirus Conjunctivitis (Option A):** Specifically **Enterovirus 70** and **Coxsackievirus A24** are responsible for **Acute Hemorrhagic Conjunctivitis (AHC)**. This condition occurs in massive, explosive epidemics (often called "Apollo Conjunctivitis") and is characterized by a short incubation period and prominent subconjunctival hemorrhages. **3. Staphylococcal Conjunctivitis (Option B):** While viral causes are more notorious for outbreaks, bacterial conjunctivitis—including *Staphylococcus aureus* and *Streptococcus pneumoniae*—can occur in epidemics, particularly in crowded environments like daycare centers, schools, or nursing homes. ### NEET-PG High-Yield Pearls: * **Epidemic Keratoconjunctivitis (EKC):** Caused by Adenovirus 8 and 19; look for "pre-auricular lymphadenopathy" and "pseudomembranes." * **Pharyngoconjunctival Fever (PCF):** Caused by Adenovirus 3 and 7; presents with fever, sore throat, and follicular conjunctivitis (often associated with swimming pools). * **Rule of 8 (EKC):** Caused by Adenovirus type 8; symptoms appear for 8 days; subepithelial infiltrates appear on day 8; and the patient is infectious for about 8 days. * **AHC:** Rapid onset, resolves quickly (5-7 days), but highly contagious.

Question 115: The patient is suffering from which stage of trachoma?

A. Trachomatous inflammation intense
B. Trachomatous scarring
C. Trachomatous corneal opacity
D. Trachomatous trichiasis (Correct Answer)

Explanation: ***Trachomatous trichiasis*** - **Inturned eyelashes** touching the cornea due to **cicatricial entropion**, causing mechanical trauma and potential corneal damage. - Represents **WHO stage TT**, where **scarred tarsal conjunctiva** contracts and pulls the eyelid margin inward, directing lashes toward the eye. *Trachomatous inflammation intense* - **WHO stage TI** characterized by **pronounced inflammatory thickening** obscuring more than half of the normal deep tarsal vessels. - Features **severe follicular hyperplasia** and **papillary hypertrophy** but lacks the cicatricial changes seen in the image. *Trachomatous scarring* - **WHO stage TS** shows **fibrous scarring** in the tarsal conjunctiva appearing as white lines or sheets. - While scarring is present, this stage precedes the **mechanical complications** of inturned lashes characteristic of trichiasis. *Trachomatous corneal opacity* - **WHO stage CO** represents **corneal opacification** over the pupil due to chronic trauma from trichiasis. - This is a **late sequela** that occurs after prolonged trichiasis, representing end-stage **blinding trachoma**.

Question 116: Swimming pool conjunctivitis is caused by which of the following agents?

A. Picornavirus
B. Chlamydia trachomatis (Correct Answer)
C. Adenovirus type 8
D. Gonococcus

Explanation: **Explanation:** **Swimming pool conjunctivitis** is a clinical manifestation of **Adult Inclusion Conjunctivitis (AIC)**, caused by **Chlamydia trachomatis (serotypes D–K)**. The infection is typically transmitted through contaminated water in inadequately chlorinated swimming pools or via autoinoculation from infected urogenital secretions. **Why the correct answer is right:** * **Chlamydia trachomatis (D–K):** These serotypes cause a follicular conjunctivitis characterized by large, opaque follicles (predominantly in the inferior fornix), mucopurulent discharge, and preauricular lymphadenopathy. It is a sexually transmitted infection (STI) that presents as an acute follicular reaction. **Why the other options are incorrect:** * **Picornavirus (Enterovirus 70/Coxsackie A24):** These cause **Acute Hemorrhagic Conjunctivitis (AHC)**, characterized by subconjunctival hemorrhages and a rapid, self-limiting course. * **Adenovirus type 8:** This is the primary cause of **Epidemic Keratoconjunctivitis (EKC)**. While Adenovirus types 3, 4, and 7 cause Pharyngoconjunctival Fever (PCF)—which is also associated with swimming pools—Adenovirus type 8 is specifically linked to highly contagious outbreaks in clinics and hospitals. * **Gonococcus:** *Neisseria gonorrhoeae* causes **Hyperacute Purulent Conjunctivitis**, characterized by profuse, thick creamy discharge and a high risk of corneal perforation. **High-Yield Clinical Pearls for NEET-PG:** * **Cytology:** Look for **Halberstaedter-Prowazek (HP) inclusion bodies** (intracytoplasmic) on Giemsa stain. * **Treatment:** The drug of choice is **Oral Azithromycin** (1g single dose) or Doxycycline (100mg BID for 7 days). Topical treatment is generally ineffective alone. * **Key Distinction:** Do not confuse "Swimming pool conjunctivitis" (Chlamydia) with "Pharyngoconjunctival Fever" (Adenovirus 3, 7), though both are linked to pools. If Chlamydia is an option, it is the classical answer for this specific term.

Question 117: What is the primary content of cobblestones in vernal conjunctivitis?

A. Eosinophils (Correct Answer)
B. Basophils
C. Lymphocytes
D. Histiocytes

Explanation: **Explanation:** **Vernal Keratoconjunctivitis (VKC)** is a bilateral, recurrent, external ocular inflammation, primarily affecting young boys. It is a **Type I hypersensitivity** reaction (IgE-mediated) often triggered by exogenous allergens. **Why Eosinophils are the correct answer:** The hallmark pathological feature of the palpebral form of VKC is the formation of **"cobblestone" papillae** on the upper tarsal conjunctiva. These papillae are formed due to the proliferation of fibrous tissue and the infiltration of inflammatory cells. **Eosinophils** are the predominant and characteristic cells found within these papillae and in the conjunctival discharge (Roper-Hall sign). Their presence is a diagnostic indicator of the allergic nature of the disease. **Analysis of Incorrect Options:** * **B. Basophils:** While basophils are involved in Type I hypersensitivity, they are not the primary cellular component of the organized cobblestone papillae. * **C. Lymphocytes:** These are typically associated with viral conjunctivitis (forming follicles) or chronic non-allergic inflammation. * **D. Histiocytes:** These are characteristic of granulomatous inflammation (like Sarcoidosis or Chalazion) rather than acute/subacute allergic reactions. **High-Yield Clinical Pearls for NEET-PG:** * **Trantas Dots:** White, chalky dots at the limbus composed of eosinophils and epithelial debris (seen in the Limbal form). * **Shield Ulcer:** A sterile, transverse oval ulcer on the upper cornea caused by the mechanical rubbing of hard papillae. * **Maxwell-Lyons Sign:** A ropey, tenacious discharge characteristic of VKC. * **Treatment:** Mast cell stabilizers (Sodium Cromoglycate) for prophylaxis; Topical steroids for acute exacerbations.

Question 118: Which of the following is NOT used in the management of ophthalmia neonatorum?

A. Erythromycin
B. Bacitracin eye ointment
C. Gentamicin
D. Local penicillin (Correct Answer)

Explanation: **Explanation:** The management of **Ophthalmia Neonatorum** (neonatal conjunctivitis) has evolved significantly due to changes in pathogen sensitivity and the risk of severe complications. **Why Local Penicillin is NOT used:** Historically, penicillin was used for *Neisseria gonorrhoeae*. However, **local (topical) penicillin is now strictly contraindicated** and avoided for two primary reasons: 1. **Hypersensitivity:** It carries a high risk of inducing severe allergic reactions and sensitization. 2. **Resistance:** Most strains of *N. gonorrhoeae* are now penicillinase-producing (PPNG), making topical penicillin ineffective. Systemic therapy (Ceftriaxone) is the current gold standard for Gonococcal infections. **Analysis of Other Options:** * **Erythromycin:** This is the drug of choice for *Chlamydia trachomatis* (the most common cause). It is used both as a topical ointment and systemically to prevent associated chlamydial pneumonia. * **Bacitracin:** This is an effective topical antibiotic used for Gram-positive bacterial infections (like *Staphylococcus aureus*) that cause neonatal conjunctivitis. * **Gentamicin:** This aminoglycoside is frequently used as a broad-spectrum topical agent to cover Gram-negative organisms, including *Pseudomonas*. **NEET-PG High-Yield Pearls:** * **Definition:** Any discharge or inflammation of the conjunctiva occurring within the **first 30 days** of life. * **Incubation Periods (High Yield):** * *Chemical (Silver Nitrate):* 0–24 hours. * *Gonococcal:* 2–5 days (Most destructive; can cause corneal perforation). * *Chlamydia (TRIC):* 5–14 days (Most common cause). * *Herpes Simplex:* 5–15 days. * **Prophylaxis:** 1% Silver nitrate (Credé's method) is largely replaced by 0.5% Erythromycin or 1% Tetracycline ointment. * **Treatment of Choice (Gonococcal):** Inj. Ceftriaxone 25–50 mg/kg (IV/IM).

Question 119: All of the following are known to cause conjunctival xerosis except?

A. Trachoma
B. Membranous conjunctivitis
C. Angular conjunctivitis (Correct Answer)
D. Ocular pemphigoid

Explanation: **Explanation:** **Conjunctival Xerosis** refers to the dryness of the conjunctiva, which can be classified into two types: **Parenchymatous xerosis** (due to local ocular diseases causing cicatrization) and **Epithelial xerosis** (due to Vitamin A deficiency). **Why Angular Conjunctivitis is the correct answer:** Angular conjunctivitis, typically caused by *Moraxella lacunata*, is a localized inflammation characterized by excoriation of the skin at the inner and outer canthi. It does **not** lead to extensive scarring or destruction of the mucin-secreting goblet cells or lacrimal ducts. Therefore, it does not cause xerosis. **Analysis of Incorrect Options (Causes of Parenchymatous Xerosis):** * **Trachoma:** Chronic cicatrizing conjunctivitis leads to the destruction of goblet cells and scarring of the ducts of the lacrimal gland, resulting in severe dryness. * **Membranous Conjunctivitis:** Severe cases (often diphtheritic) result in extensive necrosis and symblepharon formation, which obliterates the conjunctival fornices and leads to xerosis. * **Ocular Pemphigoid:** This is a chronic autoimmune cicatrizing condition. Progressive subepithelial fibrosis destroys the accessory lacrimal glands and goblet cells, making it a classic cause of xerosis. **NEET-PG High-Yield Pearls:** * **Bitot’s Spots:** The hallmark of *epithelial xerosis* (Vitamin A deficiency); usually triangular, foamy patches located on the temporal bulbar conjunctiva. * **Goblet Cells:** Located primarily in the conjunctival crypts; their destruction is the primary mechanism behind parenchymatous xerosis. * **Other causes of Xerosis:** Stevens-Johnson Syndrome (SJS), chemical burns (alkali), and prolonged exposure (Lagophthalmos).

Question 120: What is the most common cause of ophthalmia neonatorum occurring within the first 48 hours of birth?

A. Adenovirus
B. Neisseria gonorrhoeae (Correct Answer)
C. Candida albicans
D. Chlamydia trachomatis

Explanation: **Explanation:** **Ophthalmia Neonatorum** is defined as any discharge or inflammation of the conjunctiva occurring within the first month of life. The diagnosis is primarily based on the **incubation period**, which is the most high-yield factor for NEET-PG. **Why Neisseria gonorrhoeae is correct:** * **Incubation Period:** Typically appears **2–5 days** after birth, but it is the most common cause of hyperacute conjunctivitis occurring within the **first 48 hours**. * **Clinical Features:** It presents with bilateral, profuse purulent discharge and marked chemosis. It is considered a medical emergency because the bacteria can penetrate an intact corneal epithelium, leading to corneal perforation and blindness. **Why the other options are incorrect:** * **Adenovirus:** Viral conjunctivitis is rare in the immediate neonatal period; it typically presents later and is not a primary cause of ophthalmia neonatorum. * **Candida albicans:** Fungal causes are extremely rare and usually associated with prolonged NICU stays or systemic candidiasis, not the immediate 48-hour window. * **Chlamydia trachomatis:** This is the **overall most common cause** of ophthalmia neonatorum worldwide. However, its incubation period is longer (**5–14 days**), making it incorrect for the 48-hour timeframe. **High-Yield Clinical Pearls for NEET-PG:** 1. **Chemical Conjunctivitis (Silver Nitrate):** Occurs within the **first 24 hours** (usually resolves in 48 hours). 2. **Herpes Simplex (HSV-2):** Occurs within **1–2 weeks**. 3. **Treatment of Choice (Gonococcal):** Systemic Ceftriaxone (25–50 mg/kg IV/IM). 4. **Prophylaxis:** 0.5% Erythromycin ointment or 1% Silver Nitrate (Credé’s method). 5. **Key Association:** If a neonate has Chlamydial conjunctivitis, always monitor for **Chlamydial pneumonia** (presents with a characteristic "staccato cough").

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

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Pterygium and Pinguecula

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Conjunctival Trauma

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Subconjunctival Hemorrhage

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