Diseases of the Conjunctiva Practice Questions

Q: Which of the following is the likely organism causing ophthalmia neonatorum on the 3rd day of birth?

Neisseria gonorrhoeae. **Explanation:** Ophthalmia neonatorum is defined as conjunctivitis occurring within the first 30 days of life. The most critical factor in identifying the causative organism is the **incubation period** (timing of onset after birth). **1. Why Neisseria gonorrhoeae is correct:** * **Timing:** Gonococcal conjunctivitis typically presents within **2 to 5 days** of birth. Onset on the 3rd day is a classic presentation for this organism. * **Severity:** It is the most hyperacute and vision-threatening form, characterized by profuse purulent discharge, marked chemosis, and a high risk of corneal perforation if not treated urgently with systemic Ceftriaxone. **2. Why the other options are incorrect:** * **Chlamydia trachomatis (B):** This is the most common cause of ophthalmia neonatorum worldwide, but it has a longer incubation period, typically appearing **5 to 14 days** after birth. * **Streptococcus species (C) & Haemophilus influenzae (D):** These are common bacterial causes that usually present between **5 to 10 days** of life. They generally cause a milder, non-specific mucopurulent conjunctivitis compared to Neisseria. **High-Yield Clinical Pearls for NEET-PG:** * **Chemical Conjunctivitis (Silver Nitrate):** Occurs within the **first 24 hours** (usually resolves in 48 hours). * **Herpes Simplex (HSV-2):** Typically presents between **1 to 2 weeks** of life; associated with vesicular skin lesions. * **Prophylaxis:** 0.5% Erythromycin ointment is the standard of care. * **Diagnosis:** Gram stain showing **Gram-negative intracellular diplococci** confirms Neisseria. * **Important Note:** If a neonate has Chlamydial conjunctivitis, always monitor for **Chlamydial pneumonia** (presents with a characteristic "staccato cough").

Q: What is the most common cause of low vision in pterygium?

Astigmatism. **Explanation:** **Pterygium** is a triangular, fibrovascular subepithelial ingrowth of degenerative bulbar conjunctiva onto the cornea. It is most commonly seen in individuals with chronic exposure to UV light. **Why Astigmatism is the Correct Answer:** The most common cause of visual impairment in pterygium is **With-the-Rule (WTR) astigmatism**. As the pterygium grows onto the cornea, it exerts mechanical traction and flattens the horizontal meridian of the cornea. This change in corneal curvature leads to significant astigmatism even before the lesion reaches the pupillary axis. If the pterygium continues to grow and covers the visual axis (pupillary area), it can cause a further profound decrease in vision due to direct obstruction. **Analysis of Incorrect Options:** * **B. Retinal Detachment:** This is a posterior segment pathology involving the neurosensory retina and is unrelated to the surface pathology of a pterygium. * **C. Corneal ulcer and perforation:** While a pterygium can cause localized dryness (Dellen), it rarely leads to spontaneous ulceration or perforation unless complicated by severe secondary infection or trauma. * **D. Myopia:** Pterygium affects the corneal curvature (astigmatism) rather than the axial length of the eye or the overall refractive power in a way that induces simple myopia. **High-Yield Clinical Pearls for NEET-PG:** * **Stocking’s Line:** An iron deposition line seen on the corneal epithelium anterior to the head of the pterygium (indicates stability). * **Fuchs’ Flecks:** Small greyish-white opacities seen at the advancing edge. * **Surgical Gold Standard:** Wide excision with **Limbal Conjunctival Autograft (CAG)** is the treatment of choice to minimize recurrence. * **Indication for Surgery:** Visual impairment (astigmatism or pupillary encroachment), cosmetic disfigurement, or restricted ocular motility.

Q: Trantas spots and Herbe's pits are seen in which of the following conditions?

Trachoma. **Explanation:** The correct answer is **Trachoma (Option A)**. Trachoma, caused by *Chlamydia trachomatis* (serotypes A, B, Ba, and C), is characterized by specific clinical features depending on the stage of the disease. * **Herbert’s Pits:** These are pathognomonic for Trachoma. They are shallow, oval, or circular depressions found at the superior limbus. They represent the scarred remains of ruptured limbal follicles. * **Trantas Spots:** These are small, white, elevated dots found at the limbus, consisting of eosinophils and epithelial debris. While classically associated with Vernal Keratoconjunctivitis (VKC), they can also be seen in the limbal form of Trachoma during active inflammation. **Analysis of Incorrect Options:** * **Option B (Following conjunctivitis):** General bacterial or viral conjunctivitis does not typically result in permanent limbal scarring (pits) or specific eosinophilic deposits. * **Option C (Spring catarrh/VKC):** While **Trantas spots** are a hallmark of the limbal form of Spring Catarrh (Vernal Keratoconjunctivitis), **Herbert’s pits** are exclusive to Trachoma. Since the question asks for both, Trachoma is the most accurate clinical association. * **Option D (Glaucoma):** This is a disease of the optic nerve and intraocular pressure; it does not involve the formation of conjunctival follicles or limbal pits. **High-Yield Clinical Pearls for NEET-PG:** * **Arlt’s Line:** Horizontal scarring of the superior palpebral conjunctiva (seen in Trachoma). * **SAFE Strategy (WHO):** **S**urgery, **A**ntibiotics (Azithromycin), **F**acial cleanliness, **E**nvironmental improvement. * **Pannus:** Trachomatous pannus is typically superior and progressive. * **Differential:** If the question only mentions "Cobblestone papillae" or "Shield ulcer," think **Spring Catarrh (VKC)**. If it mentions "Herbert's pits," it is always **Trachoma**.

Q: Which of the following is NOT true regarding Parinaud's oculoglandular syndrome?

Bilateral presentation. **Explanation:** **Parinaud’s Oculoglandular Syndrome (POGS)** is a clinical triad characterized by unilateral granulomatous conjunctivitis, a visibly swollen preauricular or submandibular lymph node, and systemic symptoms like fever. **Why Option A is the Correct Answer (The "NOT True" statement):** POGS is classically a **unilateral** condition. It occurs when a pathogen is directly inoculated into the conjunctiva of one eye, leading to localized granulomatous nodules. Bilateral involvement is extremely rare and would suggest a different systemic pathology. **Analysis of Incorrect Options:** * **Option B (Preauricular lymphadenopathy):** This is a hallmark feature. The regional lymph nodes (preauricular or submandibular) on the same side as the affected eye become significantly enlarged and may occasionally suppurate. * **Option C (Fever):** As a systemic infectious syndrome, patients often present with constitutional symptoms, including fever, malaise, and lethargy. * **Option D (Cat scratch disease):** *Bartonella henselae* (the causative agent of Cat Scratch Disease) is the **most common cause** of POGS. Other causes include Tularemia, Sporotrichosis, and Tuberculosis. **High-Yield Clinical Pearls for NEET-PG:** * **Most Common Cause:** *Bartonella henselae* (transmitted via cat saliva/scratches). * **Clinical Triad:** Unilateral granulomatous conjunctivitis + Ipsilateral lymphadenopathy + Fever. * **Differential Diagnosis:** Do not confuse this with **Parinaud’s Syndrome (Dorsal Midbrain Syndrome)**, which involves vertical gaze palsy and is a neuro-ophthalmological condition. * **Management:** Usually self-limiting, but systemic antibiotics (e.g., Azithromycin or Doxycycline) are used for *Bartonella*.

Q: What is the earliest feature of xerophthalmia?

Night blindness. **Explanation:** Xerophthalmia refers to the spectrum of ocular manifestations resulting from Vitamin A deficiency. The correct answer is **Night Blindness (Nyctalopia)** because it represents the earliest functional clinical symptom of the disease. **1. Why Night Blindness is Correct:** Vitamin A (retinol) is a precursor to rhodopsin, the photopigment found in the rod cells of the retina responsible for vision in low light. In deficiency states, the regeneration of rhodopsin is impaired, leading to a decreased sensitivity to light. According to the **WHO classification of Xerophthalmia**, Night Blindness is categorized as **XN**, the very first clinical stage. **2. Why the other options are incorrect:** * **Conjunctival Xerosis (X1A):** This is the earliest *structural/objective sign* (visible on examination), characterized by a muddy, lusterless appearance of the conjunctiva. However, it occurs after the functional onset of night blindness. * **Bitot Spots (X1B):** These are triangular, foamy, silvery-white patches on the bulbar conjunctiva (usually temporal). They represent keratinized epithelial debris and occur after initial xerosis. * **Dry Eye:** While xerophthalmia literally means "dry eye," in a clinical context, "dry eye" is a non-specific term. In the WHO hierarchy, specific stages like XN or X1A are prioritized as the "earliest" features. **NEET-PG High-Yield Pearls:** * **WHO Classification Sequence:** XN (Night blindness) → X1A (Conjunctival xerosis) → X1B (Bitot spots) → X2 (Corneal xerosis) → X3A/X3B (Keratomalacia). * **Earliest Sign:** Conjunctival Xerosis. * **Earliest Symptom:** Night Blindness. * **Treatment (WHO Schedule):** 200,000 IU orally on Day 0, Day 1, and Day 14 (Half dose for infants 6–12 months; 50,000 IU for <6 months).

Q: Associations of atopic keratoconjunctivitis include all except?

Interstitial keratitis. **Atopic Keratoconjunctivitis (AKC)** is a chronic, bilateral inflammation of the conjunctiva and eyelids, typically occurring in patients with a history of **Atopic Dermatitis**. It is considered the ocular manifestation of generalized atopy. ### Why Interstitial Keratitis is the Correct Answer **Interstitial Keratitis (IK)** is a non-ulcerative inflammation of the corneal stroma, most commonly associated with **Congenital Syphilis** (Hutchinson’s triad), Tuberculosis, or Herpes Simplex Virus. It is not an immunological feature of atopy. AKC involves the ocular surface and epithelium, whereas IK is a deep stromal process. ### Explanation of Incorrect Options * **Atopic Dermatitis (C):** This is the primary association. Nearly 95% of AKC patients have eczema or atopic dermatitis. It is a Type I and Type IV hypersensitivity reaction. * **Keratoconus (A):** There is a strong association between AKC and Keratoconus. This is primarily attributed to chronic **vigorous eye rubbing** (due to intense pruritus), which leads to mechanical thinning and ectasia of the cornea. * **Atopic Cataract (B):** Approximately 10% of AKC patients develop cataracts. These are typically **Shield-like anterior subcapsular cataracts** or posterior subcapsular cataracts (often exacerbated by long-term steroid use). ### High-Yield Clinical Pearls for NEET-PG * **Key Feature:** AKC is often described as "the adult equivalent of Vernal Keratoconjunctivitis (VKC)," but it is more severe and involves the **lower palpebral conjunctiva** (unlike VKC, which favors the upper tarsus). * **Hertoghe Sign:** Thinning or loss of the lateral eyebrow, common in AKC due to chronic rubbing. * **Dennie-Morgan Fold:** An extra skin fold under the lower eyelid associated with atopy. * **Complications:** AKC carries a high risk of secondary **Staphylococcal blepharitis** and **Herpes Simplex Keratitis** due to impaired local cell-mediated immunity.

Q: Which drug is used to prevent the recurrence of pterygium?

Mitomycin C. **Explanation:** **Mitomycin C (MMC)** is the correct answer because it is a potent antimetabolite and alkylating agent that inhibits fibroblast proliferation. The primary challenge in pterygium surgery is the high rate of recurrence due to fibrovascular proliferation at the surgical site. By applying MMC (either intraoperatively or postoperatively), the activation of fibroblasts is suppressed, significantly reducing the risk of the pterygium growing back. **Analysis of Options:** * **Amphotericin-B (Option A):** This is a polyene antifungal medication used primarily for fungal keratitis (e.g., *Aspergillus* or *Candida* infections). It has no role in modulating wound healing or preventing tissue recurrence. * **Netilmycin (Option B):** This is an aminoglycoside antibiotic used to treat bacterial ocular infections. It does not possess anti-proliferative properties. * **Griseofulvin (Option C):** This is a systemic antifungal drug used for dermatophytosis (skin/nail infections). It is not used topically in ophthalmology. **Clinical Pearls for NEET-PG:** * **Gold Standard Treatment:** While MMC is effective, the current "Gold Standard" for preventing pterygium recurrence is **Conjunctival Autograft (CAG)**. * **Other Modalities:** Recurrence can also be managed using **5-Fluorouracil (5-FU)** or **Beta-irradiation** (Strontium-90), though the latter is less common now due to side effects like scleral melting. * **Stockers Line:** A high-yield physical finding in pterygium; it is a line of iron deposition (hemosiderin) seen at the leading edge of the pterygium on the cornea. * **Complication of MMC:** Overuse or high concentrations can lead to serious complications like **scleral thinning or melting**.

Q: Bitot spots are seen in which part of the eye?

Bulbar conjunctiva. **Explanation:** Bitot’s spots are a hallmark clinical sign of **Vitamin A deficiency (Xerophthalmia)**. They are characterized by triangular, foamy, silvery-white patches that typically appear on the **bulbar conjunctiva**. **1. Why Bulbar Conjunctiva is correct:** The bulbar conjunctiva is the most exposed part of the ocular surface. Vitamin A is essential for maintaining the health of the conjunctival epithelium. Deficiency leads to **squamous metaplasia** and keratinization of the epithelial cells. The "foamy" appearance is caused by the accumulation of keratin debris and the presence of gas-producing bacilli, such as *Corynebacterium xerosis*. These spots are most commonly found on the **temporal side** of the bulbar conjunctiva within the interpalpebral fissure. **2. Why other options are incorrect:** * **Palpebral conjunctiva:** While this area can become dry (xerosis) in severe deficiency, Bitot’s spots specifically form on the exposed bulbar surface due to atmospheric exposure. * **Cornea:** Vitamin A deficiency affects the cornea later in the disease progression (X2 and X3 stages), leading to corneal xerosis, ulcers, and keratomalacia, but Bitot’s spots are strictly conjunctival lesions. * **Eyelid:** The eyelid is skin/adnexa; though it may show signs of dryness, it is not the site for Bitot’s spots. **High-Yield Clinical Pearls for NEET-PG:** * **WHO Classification (Xerophthalmia):** Bitot’s spots are classified as **Stage X1B**. * **Location:** More common **temporally** than nasally. * **Reversibility:** Bitot’s spots in children are usually responsive to Vitamin A therapy, but in adults, they may represent permanent "sequelae" of past deficiency. * **First Symptom:** Night blindness (**Nyctalopia**, Stage X1A) is the earliest clinical symptom of Vitamin A deficiency.

Question 1

Which of the following is true regarding pterygium?

Accepted Answer

Occurs in the interpalpebral fissure, mostly on the nasal side.

Answer

Dual pterygium is located superiorly and inferiorly.

Answer

It is infective in etiology.

Answer

It is not associated with UV radiation.

Question 2

Which of the following is the likely organism causing ophthalmia neonatorum on the 3rd day of birth?

Accepted Answer

Neisseria gonorrhoeae

Answer

Chlamydia trachomatis

Answer

Streptococcus species

Answer

Haemophilus influenzae

Question 3

What is the most common cause of low vision in pterygium?

Accepted Answer

Astigmatism

Answer

Retinal Detachment

Answer

Corneal ulcer and perforation

Answer

Myopia

Question 4

Giant papillary conjunctivitis is most commonly caused by?

Accepted Answer

Contact lens wear

Answer

Trichiasis

Answer

LASIK surgery

Answer

L.ASEK surgery

Question 5

Trantas spots and Herbe's pits are seen in which of the following conditions?

Accepted Answer

Trachoma

Answer

Following conjunctivitis

Answer

Spring catarrh

Answer

Glaucoma

Question 6

Which of the following is NOT true regarding Parinaud's oculoglandular syndrome?

Accepted Answer

Bilateral presentation

Answer

Preauricular lymphadenopathy

Answer

Fever

Answer

Cat scratch disease as a probable cause

Question 7

What is the earliest feature of xerophthalmia?

Accepted Answer

Night blindness

Answer

Conjunctival xerosis

Answer

Bitot spots

Answer

Dry eye

Question 8

Associations of atopic keratoconjunctivitis include all except?

Accepted Answer

Interstitial keratitis

Answer

Keratoconus

Answer

Atopic cataract

Answer

Atopic dermatitis

Question 9

Which drug is used to prevent the recurrence of pterygium?

Accepted Answer

Mitomycin C

Answer

Amphotericin-B

Answer

Netilmycin

Answer

Griesofulvin

Question 10

Bitot spots are seen in which part of the eye?

Accepted Answer

Bulbar conjunctiva

Answer

Palpebral conjunctiva

Answer

Cornea

Answer

Eyelid

Diseases of the Conjunctiva — MCQs

Diseases of the Conjunctiva — MCQs

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