Diseases of the Conjunctiva Practice Questions

Q: What is the cause of Apollo conjunctivitis?

Enterovirus. **Explanation:** **Apollo Conjunctivitis**, clinically known as **Acute Hemorrhagic Conjunctivitis (AHC)**, is a highly contagious viral infection. The correct answer is **Enterovirus** (specifically **Enterovirus 70** and **Coxsackievirus A24**). It earned the name "Apollo conjunctivitis" because it was first recognized as a major pandemic in 1969, coinciding with the Apollo 11 moon mission. * **Why Enterovirus is correct:** These viruses cause a rapid-onset infection characterized by painful conjunctival congestion and pathognomonic **subconjunctival hemorrhages** (initially petechial, then spreading). It is typically self-limiting but spreads rapidly in crowded conditions via the fey-oral or hand-to-eye route. **Analysis of Incorrect Options:** * **Chlamydia:** Causes Trachoma or Inclusion Conjunctivitis. These are chronic or subacute infections characterized by follicles and, in the case of Trachoma, Arlt’s lines and Herbert’s pits, rather than acute hemorrhage. * **Allergy:** Allergic conjunctivitis presents with intense itching, ropy discharge, and papillae (e.g., Vernal Keratoconjunctivitis). It is not associated with the explosive outbreaks or hemorrhages seen in AHC. * **Contact Lens:** Prolonged use is associated with Giant Papillary Conjunctivitis (GPC) or microbial keratitis (often *Acanthamoeba* or *Pseudomonas*), not viral hemorrhagic epidemics. **High-Yield Clinical Pearls for NEET-PG:** * **Incubation Period:** Very short (12–48 hours). * **Key Sign:** Subconjunctival hemorrhage (starts superiorly). * **Neurological Complication:** Rarely, Enterovirus 70 is associated with a polio-like **radiculomyelitis** (cranial nerve palsies or flaccid paralysis). * **Management:** Primarily supportive; strict hand hygiene is essential to prevent outbreaks.

Q: White, ropy secretion is a characteristic feature of which of the following conditions?

Vernal keratoconjunctivitis. **Explanation:** **Vernal Keratoconjunctivitis (VKC)**, also known as "Spring Catarrh," is a bilateral, recurrent, external ocular inflammation primarily affecting young boys in warm climates. It is a **Type I hypersensitivity** reaction to exogenous allergens (like pollen). The hallmark clinical feature of VKC is the presence of **white, ropy (stringy) discharge**. This occurs due to the excessive production of mucus by hypertrophied goblet cells, which mixes with inflammatory cells (especially eosinophils) and tears, creating a characteristic tenacious secretion. **Analysis of Incorrect Options:** * **Phlyctenular Conjunctivitis:** This is a **Type IV hypersensitivity** reaction to endogenous bacterial proteins (most commonly Tubercular protein). It is characterized by small, greyish-yellow nodules (phlyctens) near the limbus, but it does not produce ropy discharge. * **Trachoma:** Caused by *Chlamydia trachomatis* (Serotypes A, B, Ba, C). It is characterized by follicles, Arlt’s line, and Herbert’s pits. The discharge is typically **mucopurulent**, not ropy. * **Tubercular Conjunctivitis:** A rare form of primary tuberculosis of the conjunctiva, usually presenting as a chronic granulomatous ulcer or nodule, often associated with regional lymphadenopathy (Parinaud’s Oculoglandular Syndrome). **High-Yield Clinical Pearls for VKC:** * **Cobblestone/Pavement stone papillae:** Large, flat-topped papillae seen on the superior palpebral conjunctiva. * **Horner-Trantas Dots:** White, chalky dots at the limbus consisting of eosinophils and epithelial debris. * **Shield Ulcer:** A sterile, indolent, oval corneal ulcer seen in the upper part of the cornea. * **Maxwell-Lyons Sign:** A thin, filmy membrane (pseudomembrane) covering the papillae, often seen in the morning.

Q: Absence of tear film is seen in?

Kerato conjunctivitis sicca. **Explanation:** **Keratoconjunctivitis Sicca (KCS)**, commonly known as Dry Eye Syndrome, is characterized by a deficiency in the quantity or quality of the precorneal tear film. It occurs due to either decreased tear production (aqueous deficiency) or increased evaporation. In severe cases, the tear film becomes unstable or virtually absent, leading to damage to the ocular surface epithelium. This is most frequently associated with **Sjögren’s syndrome** or age-related atrophy of the lacrimal glands. **Analysis of Options:** * **Lacrimal Gland Removal (Option B):** While this significantly reduces the aqueous component, it does not result in a total "absence of tear film." The accessory lacrimal glands (Krause and Wolfring) and the meibomian glands (lipid layer) continue to provide some lubrication, though insufficient for ocular health. * **Conjunctivitis (Option A):** This typically presents with **increased** tearing (epiphora) or discharge due to inflammatory irritation of the ocular surface. * **Herpes Keratitis (Option C):** This viral infection causes corneal ulceration and decreased corneal sensations, but it is generally associated with reflex tearing rather than an absence of the tear film. **High-Yield Clinical Pearls for NEET-PG:** * **Diagnosis:** The **Schirmer’s Test** is the gold standard (Normal: >15mm in 5 mins; KCS: <5mm). * **Staining:** Rose Bengal or Lissamine Green stains are used to identify devitalized epithelial cells on the conjunctiva and cornea. * **Tear Film Stability:** Measured by **Tear Film Break-up Time (BUT)**; a value <10 seconds indicates an unstable tear film. * **Systemic Association:** Always rule out Rheumatoid Arthritis and Sjögren’s syndrome in patients with severe KCS.

Q: Keratoconjunctivitis sicca is most commonly associated with which of the following conditions?

Sjogren's syndrome. **Explanation:** **Keratoconjunctivitis Sicca (KCS)**, commonly known as dry eye syndrome, is primarily caused by a deficiency in the aqueous layer of the tear film. **Why Sjogren’s Syndrome is the Correct Answer:** Sjogren’s syndrome is an autoimmune disorder characterized by lymphocytic infiltration and destruction of the exocrine glands, specifically the **lacrimal and salivary glands**. This leads to the classic triad of xerophthalmia (KCS), xerostomia (dry mouth), and often a connective tissue disorder. While KCS can occur in various systemic diseases, it is the **pathognomonic hallmark** of Sjogren’s syndrome, making it the most common and direct association. **Analysis of Incorrect Options:** * **Rheumatoid Arthritis (RA):** While RA is the most common systemic *connective tissue disease* associated with Secondary Sjogren’s, KCS itself is more fundamentally linked to the diagnosis of Sjogren’s syndrome. * **Systemic Lupus Erythematosus (SLE) & Dermatomyositis:** These are systemic autoimmune diseases that can occasionally cause secondary dry eye, but the prevalence and direct causal link are significantly lower than in Sjogren’s syndrome. **High-Yield Clinical Pearls for NEET-PG:** * **Schirmer’s Test:** Used to quantify tear production. <5 mm in 5 minutes is diagnostic for KCS. * **Rose Bengal/Lissamine Green Staining:** Highlights devitalized conjunctival and corneal epithelial cells. * **Tear Film Break-up Time (BUT):** An indicator of mucin deficiency; a value <10 seconds is abnormal. * **Filamentary Keratitis:** A common complication of severe KCS where epithelial debris and mucin form strands on the cornea.

Q: A female presented with irritation of both eyes. She also complained about the collection of a grey-white foamy discharge at the angles of the eyes along with redness in the angles. Examination reveals angular conjunctivitis. What is the causative organism of this condition?

Moraxella Axenfeld bacillus. ### Explanation **Correct Answer: A. Moraxella Axenfeld bacillus** The clinical presentation of **Angular Conjunctivitis** is classically characterized by redness (hyperemia) localized to the inner and outer canthi (angles) of the eye, accompanied by a characteristic **grey-white foamy/frothy discharge**. The underlying pathophysiology involves the production of a **proteolytic enzyme** by *Moraxella lacunata* (Axenfeld bacillus). This enzyme acts by macerating the epithelium of the conjunctiva and the surrounding skin at the angles. The foamy nature of the discharge is due to the breakdown of proteins in the tears into amino acids. **Analysis of Incorrect Options:** * **B. Pneumococci:** Typically causes acute mucopurulent conjunctivitis, often associated with petechial subconjunctival hemorrhages and a membranous presentation in severe cases, rather than angular involvement. * **C. Gonococci:** Causes hyperacute purulent conjunctivitis (Ophthalmia Neonatorum in newborns) characterized by profuse, thick, creamy pus and a high risk of corneal perforation. * **D. Adenovirus:** The most common cause of viral conjunctivitis (Pink eye). It typically presents with watery discharge, follicular reaction, and preauricular lymphadenopathy (e.g., Pharyngoconjunctival fever or Epidemic Keratoconjunctivitis). **High-Yield Clinical Pearls for NEET-PG:** * **Drug of Choice:** Topical **Oxytetracycline** or Zinc oxide. Zinc acts by inhibiting the proteolytic enzyme produced by the bacteria. * **Reservoir:** The primary reservoir for *Moraxella* is often the **nasal mucosa**; hence, concurrent nasal infection may be present. * **Differential Diagnosis:** Angular conjunctivitis can also be caused by **Staphylococcus aureus**, but the foamy discharge is pathognomonic for Moraxella. * **Deficiency Link:** Chronic angular blepharoconjunctivitis can sometimes be associated with **Pyridoxine (Vitamin B6)** or Riboflavin deficiency.

Q: Why does a subconjunctival hemorrhage typically remain bright red in color for an extended period?

The conjunctiva is permeable to oxygen.. **Explanation:** **1. Why the correct answer is right:** Subconjunctival hemorrhage (SCH) occurs when a small blood vessel under the conjunctiva ruptures, causing blood to pool in the potential space between the conjunctiva and the sclera. Unlike a bruise on the skin, which turns blue, green, or yellow as hemoglobin breaks down into biliverdin and bilirubin, a subconjunctival hemorrhage remains **bright red** for several days. This is because the **conjunctiva is a thin, semi-permeable membrane** that allows atmospheric oxygen to diffuse through it. This oxygen continuously re-oxygenates the trapped hemoglobin, maintaining its bright red (oxyhemoglobin) state until the blood is eventually reabsorbed. **2. Why the incorrect options are wrong:** * **Option B:** The "natural color" of deoxygenated blood in a closed space is dark red or purple. Without the constant supply of oxygen through the membrane, the blood would darken and change color as it degrades. * **Option C:** While it is true that the blood is trapped (pooled), the lack of drainage explains why the hemorrhage takes time to disappear (1–2 weeks), but it does not explain the specific maintenance of the bright red color. **3. Clinical Pearls for NEET-PG:** * **Etiology:** Most cases are idiopathic or caused by a sudden rise in venous pressure (e.g., coughing, sneezing, straining/Valsalva maneuver). * **Management:** It is a self-limiting condition. Reassurance is the treatment of choice. * **Red Flag:** If SCH is bilateral or recurrent, investigate for systemic hypertension or bleeding diathesis (coagulopathy). * **Trauma:** In cases of head injury, if the posterior limit of the hemorrhage is not visible, it may indicate a **base of skull fracture** (the blood tracks forward from the orbit).

Q: Which of the following stains is used to assess tear film integrity?

Rose bengal. **Explanation:** **Rose Bengal** is a vital stain that has a high affinity for **dead and degenerated epithelial cells** and areas where the protective mucin layer of the tear film is deficient. In clinical practice, it is used to assess tear film integrity and ocular surface health, particularly in diagnosing **Keratoconjunctivitis Sicca (Dry Eye Syndrome)**. It stains the conjunctival and corneal lesions a characteristic vivid pink/red, helping to identify "dry spots" or epithelial erosions. **Analysis of Incorrect Options:** * **Congo Red:** This is a histological stain used specifically to identify **Amyloid deposits**. Under polarized microscopy, it shows a characteristic "apple-green birefringence." It has no role in assessing the tear film. * **Alcian Blue:** This stain is used to highlight **acid mucopolysaccharides** (mucins). While mucin is a component of the tear film, Alcian Blue is typically used in histopathology to identify goblet cells or connective tissue disorders, rather than as a clinical tool for bedside tear film assessment. **High-Yield Clinical Pearls for NEET-PG:** 1. **Fluorescein Stain:** The gold standard for detecting **corneal epithelial defects** (ulcers). It stains the exposed stroma brilliant green. It is also used for the **Tear Film Break-up Time (TBUT)** test (Normal >10 seconds). 2. **Lissamine Green:** Similar to Rose Bengal but preferred by patients because it causes **less stinging/irritation**. It also stains dead/degenerated cells. 3. **Schirmer’s Test:** Used to quantify aqueous tear production. **Schirmer I** (without anesthesia) measures total secretion; **Schirmer II** measures reflex secretion. 4. **Bengal Rose vs. Lissamine:** Remember that Rose Bengal is slightly toxic to healthy cells, whereas Lissamine Green is better tolerated.

Q: Trachoma can cause all of the following except?

Enopthalmos. **Explanation:** Trachoma, caused by *Chlamydia trachomatis* (serotypes A, B, Ba, and C), is a chronic keratoconjunctivitis characterized by a cycle of infection and scarring. **Why Enophthalmos is the correct answer:** Enophthalmos refers to the backward displacement of the eyeball into the orbit. Trachoma primarily affects the **conjunctiva and cornea** (surface tissues). It does not involve the orbital fat, extraocular muscles, or the bony orbit, which are the structures typically implicated in enophthalmos. Therefore, enophthalmos is not a complication of Trachoma. **Analysis of incorrect options:** * **Loss of vision:** Trachoma is the leading infectious cause of preventable blindness worldwide. Vision loss occurs due to secondary corneal complications. * **Clouding of the cornea:** Chronic inflammation and mechanical trauma from inturned lashes lead to **corneal opacification** (clouding) and vascularization (pannus). * **Trichiasis:** This is a hallmark of the cicatricial (scarring) stage. Conjunctival scarring causes the eyelid margin to roll inward (Entropion), leading to misdirected eyelashes (Trichiasis) that rub against the cornea. **NEET-PG High-Yield Pearls:** * **WHO Grading (FISTO):** **F**ollicular, **I**ntense inflammation, **S**carring, **T**richiasis, **O**pacity. * **Arlt’s Line:** Horizontal scar in the upper palpebral conjunctiva (junction of anterior 1/3 and posterior 2/3). * **Herbert’s Pits:** Healed follicles at the limbus (pathognomonic). * **SAFE Strategy:** **S**urgery (for trichiasis), **A**ntibiotics (Azithromycin), **F**acial cleanliness, **E**nvironmental improvement.

Q: The histology of pterygium includes which of the following?

Elastotic degeneration. **Explanation:** **Pterygium** is a wing-shaped, fibrovascular proliferation of the subepithelial conjunctival tissue that encroaches onto the cornea. It is primarily caused by chronic exposure to ultraviolet (UV) light, which leads to the degeneration of the conjunctival stroma. **1. Why "Elastotic Degeneration" is correct:** The hallmark histological feature of a pterygium is **elastotic degeneration** of the subepithelial connective tissue. This involves the breakdown of collagen fibers and their replacement by abnormal, thickened, and tortuous elastic-like fibers (which stain with elastin stains but are not true elastin). This process is often accompanied by hyaline degeneration and increased vascularization. **2. Analysis of Incorrect Options:** * **B. Epithelial inclusion bodies:** These are characteristic of viral infections (like Trachoma) or certain types of conjunctivitis, not the degenerative process of a pterygium. * **C. Precancerous changes:** While a pterygium can occasionally undergo malignant transformation into Ocular Surface Squamous Neoplasia (OSSN), the pterygium itself is a benign degenerative condition, not a precancerous one. * **D. Squamous metaplasia:** While the overlying epithelium may show some thinning or hyperplasia, squamous metaplasia is more characteristic of Vitamin A deficiency (Xerophthalmia) or chronic dry eye states. **High-Yield Clinical Pearls for NEET-PG:** * **Stockers Line:** An iron deposition line seen at the leading edge (head) of a pterygium on the cornea. * **Fuchs’ Islets:** Small, white, precursor patches seen at the advancing edge. * **Treatment of Choice:** Surgical excision with **Limbal Conjunctival Autograft (CAG)** is the gold standard to prevent recurrence. * **Recurrence Prevention:** Mitomycin-C or Beta-irradiation are sometimes used, but CAG is preferred.

Q: Which type of neonatal conjunctivitis is most likely to cause neonatal blindness?

Neisseria gonorrhoeae. **Explanation:** **Ophthalmia Neonatorum** (neonatal conjunctivitis) is a critical topic for NEET-PG. While several pathogens cause this condition, **Neisseria gonorrhoeae** is the most dangerous because it is the only common ocular pathogen capable of **penetrating an intact corneal epithelium**. This leads to rapid corneal ulceration, perforation, and endophthalmitis, resulting in permanent blindness if not treated emergently. **Analysis of Options:** * **A. Neisseria gonorrhoeae (Correct):** Characterized by a hyperacute, hyperpurulent discharge occurring 2–5 days after birth. Its ability to cause rapid corneal melting makes it the most sight-threatening etiology. * **B. Chlamydia trachomatis:** This is the **most common** cause of neonatal conjunctivitis worldwide (occurring 5–14 days post-delivery). While it can cause scarring (micropannus), it rarely leads to acute blindness compared to Gonococcus. * **C. Streptococcus pneumoniae:** A common cause of bacterial conjunctivitis in children, but it typically presents as a milder, self-limiting infection without the aggressive corneal involvement seen in Gonorrhea. * **D. Pseudomonas:** While highly virulent and capable of causing rapid corneal destruction in adults (especially contact lens users), it is an uncommon cause of neonatal conjunctivitis compared to the other options. **High-Yield Clinical Pearls for NEET-PG:** 1. **Incubation Periods (Chronology is Key):** * Chemical (Silver nitrate): < 24 hours. * Gonococcal: 2–5 days. * Chlamydial: 5–14 days. * Herpes Simplex (HSV-2): 1–2 weeks. 2. **Prophylaxis:** 1% Silver nitrate (Credé's method) is historical; 0.5% Erythromycin ointment is the current standard. 3. **Treatment:** Systemic Ceftriaxone is mandatory for Gonococcal conjunctivitis to prevent both blindness and systemic dissemination.

Question 1

What is the cause of Apollo conjunctivitis?

Accepted Answer

Enterovirus

Answer

Chlamydia

Answer

Allergy

Answer

Contact lens

Question 2

White, ropy secretion is a characteristic feature of which of the following conditions?

Accepted Answer

Vernal keratoconjunctivitis

Answer

Phylectenular conjunctivitis

Answer

Trachoma

Answer

Tubercular conjunctivitis

Question 3

Absence of tear film is seen in?

Accepted Answer

Kerato conjunctivitis sicca

Answer

Conjunctivitis

Answer

Lacrimal gland removal

Answer

Herpes keratitis

Question 4

Keratoconjunctivitis sicca is most commonly associated with which of the following conditions?

Accepted Answer

Sjogren's syndrome

Answer

Systemic lupus erythematosus (SLE)

Answer

Dermatomyositis

Answer

Rheumatoid arthritis (RA)

Question 5

A female presented with irritation of both eyes. She also complained about the collection of a grey-white foamy discharge at the angles of the eyes along with redness in the angles. Examination reveals angular conjunctivitis. What is the causative organism of this condition?

Accepted Answer

Moraxella Axenfeld bacillus

Answer

Pneumococci

Answer

Gonococci

Answer

Adenovirus

Question 6

Why does a subconjunctival hemorrhage typically remain bright red in color for an extended period?

Accepted Answer

The conjunctiva is permeable to oxygen.

Answer

The natural color of blood.

Answer

There is no drainage for the pooled blood.

Answer

None of the above.

Question 7

Which of the following stains is used to assess tear film integrity?

Accepted Answer

Rose bengal

Answer

Congo red

Answer

Alcian Blue

Answer

All of the above

Question 8

Trachoma can cause all of the following except?

Accepted Answer

Enopthalmos

Answer

Loss of vision

Answer

Clouding of the cornea

Answer

Trichiasis

Question 9

The histology of pterygium includes which of the following?

Accepted Answer

Elastotic degeneration

Answer

Epithelial inclusion bodies

Answer

Precancerous changes

Answer

Squamous metaplasia of the epithelium

Question 10

Which type of neonatal conjunctivitis is most likely to cause neonatal blindness?

Accepted Answer

Neisseria gonorrhoeae

Answer

Chlamydia trachomatis

Answer

Streptococcus pneumoniae

Answer

Pseudomonas

Diseases of the Conjunctiva — MCQs

Diseases of the Conjunctiva — MCQs

On this page

Practice by Chapter

Want unlimited practice?