Diseases of the Conjunctiva Practice Questions

Q: According to WHO, which method is applied for prophylactic use in ophthalmia neonatorum?

Silver nitrate solution. **Explanation:** **Ophthalmia Neonatorum** is a form of conjunctivitis occurring within the first 30 days of life, typically contracted during passage through the birth canal. **1. Why Silver Nitrate is Correct:** The use of **1% Silver Nitrate solution** is known as **Credé’s Prophylaxis**. Historically, it was the first widely adopted method to prevent gonococcal ophthalmia neonatorum. While many developed countries have switched to antibiotic ointments due to the risk of chemical conjunctivitis, the **WHO** continues to recommend 1% Silver Nitrate (or 1% Tetracycline/0.5% Erythromycin) as a cost-effective and accessible prophylactic agent in many settings to prevent *Neisseria gonorrhoeae* infection, which can lead to corneal perforation and blindness. **2. Analysis of Incorrect Options:** * **B & C (Erythromycin/Tetracycline):** While these are the preferred prophylactic agents in the US (CDC guidelines) because they are less irritating than silver nitrate and provide some coverage against *Chlamydia*, the question specifically asks for the classic WHO-recommended prophylactic method often associated with Credé’s method in standard textbooks. * **D (Penicillin injection):** Systemic penicillin is used for the **treatment** of confirmed gonococcal conjunctivitis, not as a routine prophylactic topical measure. **3. High-Yield Clinical Pearls for NEET-PG:** * **Most Common Cause overall:** *Chlamydia trachomatis* (presents at 5–14 days). * **Most Dangerous Cause:** *Neisseria gonorrhoeae* (presents early, 2–5 days; can penetrate intact corneal epithelium). * **Chemical Conjunctivitis:** Occurs within the first 24 hours; typically caused by Silver Nitrate itself. * **Incubation Periods:** * Chemical: <24 hours * Gonococcal: 2–5 days * Chlamydial: 5–14 days * Herpes Simplex: 1–2 weeks

Q: A swimmer presents with redness and mucopurulent discharge after exiting a swimming pool. There is no history of contact lens wear, and examination reveals no corneal involvement. What is the probable diagnosis?

Adult inclusion conjunctivitis. **Explanation:** The clinical presentation of acute redness and mucopurulent discharge following swimming pool exposure is a classic "textbook" scenario for **Adult Inclusion Conjunctivitis (AIC)**. **1. Why Adult Inclusion Conjunctivitis is correct:** AIC is caused by *Chlamydia trachomatis* (serotypes D-K). It is often transmitted through contaminated swimming pool water (hence the name "swimming pool conjunctivitis") or via autoinoculation from genital secretions. Key diagnostic features include: * **Follicular response:** Predominantly in the inferior fornix. * **Discharge:** Mucopurulent. * **Chronicity:** If untreated, it persists for weeks to months. * **Preauricular lymphadenopathy:** Often present. **2. Why other options are incorrect:** * **Acanthamoeba keratitis:** Primarily associated with **contact lens wearers** using tap water for cleaning. It presents with disproportionately severe pain and characteristic ring infiltrates on the cornea; the question explicitly states no corneal involvement. * **Vernal keratoconjunctivitis (VKC):** An allergic condition (Type I hypersensitivity) characterized by intense itching, "cobblestone" papillae on the superior tarsal conjunctiva, and Horner-Trantas dots. It is not associated with swimming pools or mucopurulent discharge. * **Angular conjunctivitis:** Caused by *Moraxella lacunata*. It presents with excoriation and redness specifically at the **inner and outer canthi** (angles) of the eye, not generalized conjunctivitis. **Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** NAAT (Nucleic Acid Amplification Test). * **Cytology:** Shows **Halberstaedter-Prowazek (HP) inclusion bodies** (intracytoplasmic). * **Treatment:** Systemic antibiotics are mandatory (e.g., **Azithromycin 1g single dose** or Doxycycline 100mg BD for 7 days) because it is a sexually transmitted infection; the partner must also be treated.

Q: Which of the following is NOT a feature of allergic conjunctivitis?

Usually present throughout the year. ### Explanation **Allergic Conjunctivitis** is a type I hypersensitivity reaction (IgE-mediated) triggered by environmental allergens. **Why Option D is the correct answer:** Allergic conjunctivitis is typically **seasonal** (Seasonal Allergic Conjunctivitis - SAC), occurring most frequently during spring and summer when pollen, grass, and weed counts are high. While a "perennial" form exists (due to dust mites or pet dander), the classic presentation tested in exams is intermittent and seasonal, not "usually present throughout the year." **Analysis of Incorrect Options:** * **A. Itching:** This is the **hallmark symptom**. In clinical practice and exams, if itching is absent, the diagnosis of allergic conjunctivitis is highly unlikely. * **B. Papillary hyperplasia:** Papillae are the characteristic clinical sign of allergic and mechanical inflammation. They represent vascular tufts with eosinophilic and lymphocytic infiltration, often giving a "cobblestone" appearance in severe cases like Vernal Keratoconjunctivitis (VKC). * **C. Presence of eosinophils:** Since it is a Type I hypersensitivity reaction, conjunctival scrapings typically show eosinophils. While their absence doesn't rule it out, their presence is a definitive diagnostic feature. **High-Yield Clinical Pearls for NEET-PG:** * **Vernal Keratoconjunctivitis (VKC):** A bilateral, recurrent inflammation common in young boys. Look for **Horner-Trantas dots** (white limbal spots consisting of eosinophils and epithelial debris) and **Shield ulcers**. * **Treatment:** The mainstay of treatment includes **Mast cell stabilizers** (Sodium Cromoglycate), **Antihistamines** (Olopatadine), and topical steroids for acute exacerbations. * **Cytology:** Remember, **Eosinophils** = Allergic; **Lymphocytes** = Viral; **Polymorphonuclear cells (PMNs)** = Bacterial.

Q: Viral Conjunctivitis is most commonly caused by which virus?

Adenovirus. **Explanation:** **Adenovirus** is the most common cause of viral conjunctivitis worldwide, accounting for up to 65–90% of all cases. It typically presents as a highly contagious follicular conjunctivitis. Two specific clinical syndromes are high-yield for exams: 1. **Pharyngoconjunctival Fever (PCF):** Caused by serotypes 3, 4, and 7; characterized by fever, pharyngitis, and follicular conjunctivitis. 2. **Epidemic Keratoconjunctivitis (EKC):** Caused by serotypes 8, 19, and 37; more severe, often involving the cornea with pathognomonic **subepithelial infiltrates**. **Analysis of Incorrect Options:** * **Herpes Simplex Virus (HSV):** While a common cause of viral keratitis (dendritic ulcers), it is a less frequent cause of isolated conjunctivitis. It is typically unilateral and associated with vesicular skin lesions. * **Enterovirus & Coxsackie A Virus:** These are the primary causative agents of **Acute Hemorrhagic Conjunctivitis (AHC)** (specifically Enterovirus 70 and Coxsackie A24). While they cause dramatic subconjunctival hemorrhages and have a rapid onset, they occur in explosive epidemics and are less common than Adenoviral infections. **Clinical Pearls for NEET-PG:** * **Preauricular Lymphadenopathy:** A hallmark sign of viral conjunctivitis (especially Adenoviral). * **Transmission:** Highly contagious via respiratory droplets or contaminated fingers/ophthalmic instruments (Tonometers). * **Management:** Primarily supportive (cold compresses, artificial tears). Steroids are contraindicated in the acute phase unless membranes/pseudomembranes are present.

Q: Trantas spots are seen in which of the following conditions?

Vernal conjunctivitis. **Explanation:** **Trantas spots** (also known as Horner-Trantas spots) are a pathognomonic clinical feature of **Vernal Keratoconjunctivitis (VKC)**, a bilateral, recurrent, seasonal allergic inflammation of the conjunctiva typically affecting young males. 1. **Why Vernal Conjunctivitis is correct:** Trantas spots are small, white, chalky elevations found at the **limbus**. They are composed of collections of **eosinophils and degenerated epithelial cells**. They are most commonly seen in the limbal or mixed variety of VKC. Their presence indicates active disease. 2. **Why other options are incorrect:** * **Eczematous conjunctivitis:** Also known as Phlyctenular keratoconjunctivitis, it is characterized by "phlyctens" (small greyish-yellow nodules) which are a type IV hypersensitivity reaction to endogenous bacterial proteins (most commonly Tubercular protein), not eosinophilic aggregates. * **Ophthalmia nodosa:** This is a granulomatous inflammation caused by the penetration of caterpillar hairs into the ocular tissues. It presents with nodules but lacks the allergic eosinophilic pathology of Trantas spots. * **Tularemia:** This causes Parinaud’s Oculoglandular Syndrome, characterized by granulomatous conjunctivitis with regional lymphadenopathy, usually following contact with infected animals (rabbits). **High-Yield Clinical Pearls for NEET-PG:** * **VKC Hallmarks:** Cobblestone/Giant papillae (Palpebral form), Shield ulcers (due to macro-papillae rubbing the cornea), and Maxwell-Lyons sign (stringy discharge). * **Pathology:** Type 1 and Type 4 hypersensitivity reactions. * **Treatment:** Mast cell stabilizers (Olopatadine) are the mainstay; topical steroids are used for acute exacerbations.

Q: Which of the following are features of vernal keratoconjunctivitis?

Tantra's Spots. **Explanation:** **Vernal Keratoconjunctivitis (VKC)**, also known as "Spring Catarrh," is a bilateral, recurrent, external ocular inflammation primarily affecting young boys in hot, dry climates. It is a Type I and Type IV hypersensitivity reaction. **Why Option D is Correct:** **Trantas’ Spots** (also known as Horner-Trantas spots) are a hallmark clinical feature of the limbal or mixed form of VKC. They are small, white, elevated dots found at the limbus, consisting of **eosinophils and degenerated epithelial cells**. Their presence is highly diagnostic for active VKC. **Analysis of Incorrect Options:** * **A. Papillary hypertrophy:** While VKC is characterized by papillae (specifically large, "cobblestone" or "pavement stone" papillae on the superior tarsal conjunctiva), the question asks for a specific feature. In many exams, Trantas' spots are considered the more pathognomonic sign compared to generalized papillary hypertrophy, which can occur in other forms of conjunctivitis. * **B. Follicular hypertrophy:** This is characteristic of **Viral** or **Chlamydial** conjunctivitis. VKC is a papillary disease, not a follicular one. * **C. Herbert's pits:** These are scarred, depressed remnants of limbal follicles and are pathognomonic for **Trachoma** (Stage IV), not VKC. **High-Yield Clinical Pearls for NEET-PG:** * **Demographics:** Most common in males aged 5–15 years. * **Symptoms:** Intense itching (hallmark), ropy discharge, and photophobia. * **Corneal Involvement:** Look for **Shield Ulcers** (sterile, indolent) and **Maxwell-Lyons sign** (ropy discharge). * **Treatment:** Mast cell stabilizers (Prophylaxis), Topical Steroids (Acute phase), and Cyclosporine/Tacrolimus for steroid-sparing effects.

Q: What is the dosage of retinol palmitate for early stages of xerophthalmia?

110 mg orally on two successive days. ### Explanation **1. Understanding the Correct Answer (Option C)** The treatment protocol for clinical xerophthalmia (Bitot’s spots, corneal xerosis, keratomalacia) involves the immediate administration of high-dose Vitamin A. The standard therapeutic dose for adults and children over one year of age is **200,000 International Units (IU)**. In pharmacological terms, **1 IU of Vitamin A is equivalent to 0.55 mcg of Retinol Palmitate**. Therefore: * 200,000 IU × 0.55 mcg = 110,000 mcg * 110,000 mcg = **110 mg** The WHO treatment schedule requires this dose to be given on **Day 1, Day 2, and Day 14** (or at follow-up 2–4 weeks later). The question specifically highlights the initial intensive phase (two successive days). **2. Why Other Options are Incorrect** * **Options A, B, and D:** These values (90 mg, 100 mg, 120 mg) do not mathematically correspond to the standardized 200,000 IU dose of retinol palmitate. 100 mg is a common distractor because it is a "round number," but it falls short of the required 200,000 IU potency. **3. High-Yield Clinical Pearls for NEET-PG** * **Prophylaxis vs. Treatment:** Do not confuse treatment doses (200,000 IU) with the Vitamin A Prophylaxis Program doses (100,000 IU for 6–11 months; 200,000 IU for 1–5 years every 6 months). * **Age-Specific Dosing (Treatment):** * ** 1 year:** 200,000 IU (110 mg) * **Xerophthalmia Classification:** Remember the WHO "X" classification (X1A: Conjunctival xerosis; X1B: Bitot’s spots; X3A/B: Corneal ulceration/Keratomalacia). * **Night Blindness (XN):** The earliest clinical sign; Bitot’s spots are the most common objective sign.

Q: Identify the ocular condition shown in the image.

Herbert's pits. ***Herbert's pits*** - The image displays shallow, scalloped depressions at the superior corneoscleral junction (limbus), which are characteristic of **Herbert's pits**. - These pits are pathognomonic for **trachoma**, representing the cicatricial remains of resolved limbal follicles. *Horner-Trantas spots* - These are distinct gelatinous nodules or dots at the limbus composed of degenerated epithelial cells and **eosinophils**. - They are a hallmark sign of **vernal keratoconjunctivitis (VKC)**, an allergic eye disease, and do not appear as pitted scars. *Pannus* - Pannus is the ingrowth of fibrovascular tissue and **neovascularization** onto the cornea, typically from the superior limbus. - While pannus is also a sign of **trachoma**, the image specifically highlights the pitted scarring of Herbert's pits, not a sheet of blood vessels. *Arlt's line* - This refers to a line of scarring on the **tarsal conjunctiva**, which is the inner surface of the eyelid. - It is a sign of cicatricial **trachoma** but would only be visible upon eversion of the eyelid, not on the globe itself as shown in the image.

Q: The finding seen in the image is:

Herbert's pits. ***Herbert's pits*** - These are pathognomonic signs of **cicatricial trachoma**, representing shallow, depressed scars located at the superior corneoscleral junction (limbus). - They are formed by the resolution and scarring of **limbal follicles**, which are characteristic of the active inflammatory stage of trachoma. *Horner-Trantas spots* - These are small, white, gelatinous nodules seen at the limbus, composed of degenerated eosinophils and epithelial cells. - They are a characteristic finding in **vernal keratoconjunctivitis (VKC)**, an allergic eye condition, and are not seen in trachoma. *Pannus* - Pannus refers to the growth of fibrovascular tissue from the limbus onto the peripheral cornea. - While a **superior pannus** is a common finding in trachoma, the specific depressions shown in the image are Herbert's pits, not the pannus itself. *Arlt's line* - This is a horizontal line of scar tissue found on the **tarsal conjunctiva** of the upper eyelid. - It is another sign of cicatricial trachoma but is located on the inner surface of the eyelid, not at the limbus as seen in the image.

Q: What is the diagnosis shown in the image?

Vernal conjunctivitis. ***Vernal conjunctivitis*** - The image shows a **thick, ropy white discharge** (mucus plaque) on the lower conjunctiva, which is a classic sign of **vernal keratoconjunctivitis (VKC)**. - VKC is a chronic, bilateral allergic inflammatory disease, more common in young males, presenting with severe itching, photophobia, and the characteristic discharge as seen here, often associated with a **cobblestone appearance** of the upper tarsal conjunctiva. *Trachoma* - Trachoma is characterized by conjunctival inflammation, leading to **follicle formation** on the upper tarsal conjunctiva and later scarring (Arlt's line) and inversion of the eyelids (**trichiasis**). - The discharge in trachoma is typically mucopurulent, but not the thick, ropy white plaque seen in the image. *Atopic keratoconjunctivitis* - Atopic keratoconjunctivitis (AKC) is a chronic allergic inflammation that typically affects **older patients with a history of atopic dermatitis**. - While AKC can present with mucoid discharge and papillary changes, it is more commonly associated with **lower tarsal involvement**, lid margin inflammation, and occurs in an older age group compared to VKC. *Phlyctenular keratoconjunctivitis* - Phlyctenular keratoconjunctivitis is characterized by the appearance of small, localized, **nodular lesions (phlyctenules)** on the conjunctiva or cornea, often associated with delayed-type hypersensitivity reactions to bacterial antigens (e.g., Mycobacterium tuberculosis, Staphylococcus aureus). - While it involves conjunctival inflammation, it typically does not present with the thick, ropy mucus plaques characteristic of VKC.

Question 1

According to WHO, which method is applied for prophylactic use in ophthalmia neonatorum?

Accepted Answer

Silver nitrate solution

Answer

Erythromycin ointment

Answer

Tetracycline ointment

Answer

Penicillin injection

Question 2

A swimmer presents with redness and mucopurulent discharge after exiting a swimming pool. There is no history of contact lens wear, and examination reveals no corneal involvement. What is the probable diagnosis?

Accepted Answer

Adult inclusion conjunctivitis

Answer

Acanthamoeba keratitis

Answer

Vernal keratoconjunctivitis

Answer

Angular conjunctivitis

Question 3

Which of the following is NOT a feature of allergic conjunctivitis?

Accepted Answer

Usually present throughout the year

Answer

Itching

Answer

Papillary hyperplasia

Answer

Presence of abundant eosinophils in the discharge

Question 4

Viral Conjunctivitis is most commonly caused by which virus?

Accepted Answer

Adenovirus

Answer

Herpes simplex virus

Answer

Enterovirus

Answer

Coxsackie A virus

Question 5

Trantas spots are seen in which of the following conditions?

Accepted Answer

Vernal conjunctivitis

Answer

Eczematous conjunctivitis

Answer

Ophthalmia nodosa

Answer

Tularemia

Question 6

Which of the following are features of vernal keratoconjunctivitis?

Accepted Answer

Tantra's Spots

Answer

Papillary hypertrophy

Answer

Follicular hypertrophy

Answer

Herbert's pits

Question 7

What is the dosage of retinol palmitate for early stages of xerophthalmia?

Accepted Answer

110 mg orally on two successive days

Answer

90 mg orally on two successive days

Answer

100 mg orally on two successive days

Answer

120 mg orally on two successive days

Question 8

Identify the ocular condition shown in the image.

Accepted Answer

Herbert's pits

Answer

Arlt's line

Answer

Pannus

Answer

Horner-Trantas spots

Question 9

The finding seen in the image is:

Accepted Answer

Herbert's pits

Answer

Arlt's line

Answer

Pannus

Answer

Horner-Trantas spots

Question 10

What is the diagnosis shown in the image?

Accepted Answer

Vernal conjunctivitis

Answer

Trachoma

Answer

Phlyctenular keratoconjunctivitis

Answer

Atopic keratoconjunctivitis

Diseases of the Conjunctiva — MCQs

Diseases of the Conjunctiva — MCQs

On this page

Practice by Chapter

Want unlimited practice?