Diseases of the Conjunctiva Practice Questions

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

Spring catarrh. **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.

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

All of the above. **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.)

Q: Which of the following conditions can occur in epidemics?

All of the above. ### 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.

Q: The patient is suffering from which stage of trachoma?

Trachomatous trichiasis. ***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**.

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

Eosinophils. **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.

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

Local penicillin. **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).

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

Angular conjunctivitis. **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).

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

Neisseria gonorrhoeae. **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").

Question 1

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

Accepted Answer

Spring catarrh

Answer

Phlyctenular conjunctivitis

Answer

Foreign body

Answer

Trachoma

Question 2

Giant Papillary Conjunctivitis is caused by which of the following?

Accepted Answer

All of the above

Answer

Contact lens wear

Answer

Ocular prosthesis

Answer

Protruding corneal sutures

Question 3

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

Accepted Answer

Scleritis

Answer

Acute bacterial conjunctivitis

Answer

Acute iritis

Answer

Acute glaucoma

Question 4

Which of the following conditions can occur in epidemics?

Accepted Answer

All of the above

Answer

Enterovirus conjunctivitis

Answer

Staphylococcal conjunctivitis

Answer

Adenovirus conjunctivitis

Question 5

The patient is suffering from which stage of trachoma?

Accepted Answer

Trachomatous trichiasis

Answer

Trachomatous inflammation intense

Answer

Trachomatous scarring

Answer

Trachomatous corneal opacity

Question 6

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

Accepted Answer

Chlamydia trachomatis

Answer

Picornavirus

Answer

Adenovirus type 8

Answer

Gonococcus

Question 7

What is the primary content of cobblestones in vernal conjunctivitis?

Accepted Answer

Eosinophils

Answer

Basophils

Answer

Lymphocytes

Answer

Histiocytes

Question 8

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

Accepted Answer

Local penicillin

Answer

Erythromycin

Answer

Bacitracin eye ointment

Answer

Gentamicin

Question 9

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

Accepted Answer

Angular conjunctivitis

Answer

Trachoma

Answer

Membranous conjunctivitis

Answer

Ocular pemphigoid

Question 10

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

Accepted Answer

Neisseria gonorrhoeae

Answer

Adenovirus

Answer

Candida albicans

Answer

Chlamydia trachomatis

Diseases of the Conjunctiva — MCQs

Diseases of the Conjunctiva — MCQs

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