Diseases of the Conjunctiva Practice Questions

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

Acute bacterial conjunctivitis. **Explanation:** The key to answering this question lies in distinguishing between **superficial (conjunctival)** and **deep (ciliary/circumcorneal)** congestion. **1. Why Acute Bacterial Conjunctivitis is the correct answer:** In acute bacterial conjunctivitis, the inflammation is limited to the conjunctiva. The congestion is **superficial**, meaning the redness is most intense in the fornices and periphery, fading toward the limbus. The vessels are bright red, move with the conjunctiva, and blanch with 0.1% adrenaline. **Circumcorneal congestion (ciliary flush)**, however, involves the deep episcleral vessels surrounding the limbus and is a hallmark of intraocular or deep-seated inflammation. **2. Why the other options are incorrect:** * **Acute Iritis:** Inflammation of the iris involves the ciliary body. The ciliary vessels (branches of anterior ciliary arteries) become engorged, leading to a characteristic dusky-red circumcorneal flush. * **Acute Glaucoma:** A sudden rise in intraocular pressure causes significant ocular ischemia and inflammation, leading to intense ciliary congestion. * **Scleritis:** This is a deep-seated inflammation of the sclera. Because the deep episcleral plexus is involved, circumcorneal congestion is a prominent feature. **Clinical Pearls for NEET-PG:** * **Ciliary Flush:** Characterized by a violaceous/purplish hue, vessels do not move with the conjunctiva and do **not** blanch with adrenaline. * **The "Big Three" of Red Eye:** Always differentiate Acute Conjunctivitis (superficial) from Acute Iridocyclitis and Acute Angle Closure Glaucoma (deep/circumcorneal). * **Discharge:** Presence of mucopurulent discharge strongly points toward conjunctivitis, whereas its absence suggests deeper pathology.

Q: Deficiency of the mucin layer of the tear film occurs in which of the following conditions?

Keratoconjunctivitis sicca. **Explanation:** The tear film consists of three distinct layers: the **outer lipid layer** (meibomian glands), the **middle aqueous layer** (lacrimal glands), and the **inner mucin layer** (conjunctival goblet cells). **1. Why Keratoconjunctivitis Sicca (KCS) is correct:** KCS is a multifactorial disease of the ocular surface. While it is often associated with aqueous deficiency (Sjögren’s syndrome), it also involves significant damage to the conjunctival goblet cells. This leads to a **deficiency in the mucin layer**, which is essential for converting the hydrophobic corneal surface into a hydrophilic one, allowing the tear film to spread evenly. **2. Analysis of Incorrect Options:** * **Lacrimal gland removal:** This results in a pure **aqueous layer deficiency**, as the lacrimal gland is responsible for the bulk of water production. * **Canalicular block:** This causes **epiphora** (overflow of tears) due to an obstruction in the drainage system, rather than a deficiency in any tear film component. * **Herpetic keratitis:** This is a viral infection of the cornea. While it can cause secondary dry eye due to decreased corneal sensitivity (neurotrophic effect), it is not primarily defined by a mucin layer deficiency. **High-Yield Clinical Pearls for NEET-PG:** * **Mucin Layer Secretors:** Goblet cells (primary), Crypts of Henle, and Glands of Manz. * **Schirmer’s Test I:** Measures total tear secretion (Aqueous). <10mm in 5 mins is abnormal. * **Tear Film Break-up Time (TBUT):** The gold standard for assessing **mucin deficiency** and tear film stability. Normal is 15–35 seconds; <10 seconds indicates instability. * **Rose Bengal/Lissamine Green Stains:** Used to identify devitalized cells caused by mucin deficiency.

Q: Ligneous conjunctivitis is caused by:

Membranous conjunctivitis. **Explanation:** **Ligneous conjunctivitis** is a rare, chronic form of **membranous conjunctivitis** characterized by the formation of thick, firm, wood-like (ligneous) membranes on the palpebral conjunctiva. 1. **Why Membranous Conjunctivitis is correct:** The underlying pathophysiology involves a systemic **Type 1 Plasminogen deficiency**. This leads to impaired fibrinolysis, causing excessive fibrin deposition on mucous membranes. In the eye, this manifests as persistent, "woody" pseudomembranes or true membranes that recur rapidly if surgically removed. 2. **Why other options are incorrect:** * **Purulent conjunctivitis:** Typically caused by *N. gonorrhoeae*, it presents with profuse, thick pus but does not form organized, chronic woody membranes. * **Angular conjunctivitis:** Caused by *Moraxella lacunata*, it involves excoriation of the skin at the inner and outer canthi, not membrane formation. * **Phlyctenular conjunctivitis:** A type IV hypersensitivity reaction to endogenous toxins (like Tuberculoprotein), characterized by small, greyish-yellow nodules (phlyctens) near the limbus. **High-Yield Clinical Pearls for NEET-PG:** * **Pathognomonic Feature:** "Woody" consistency of the conjunctiva. * **Genetic Basis:** Autosomal recessive inheritance; mutation in the **PLG gene** (Plasminogen deficiency). * **Systemic Involvement:** Similar membranes can form in the mouth (gingiva), nasopharynx, and female genital tract. * **Treatment:** Topical heparin or concentrated plasminogen drops (surgical excision alone usually leads to aggressive recurrence).

Q: All are known to produce parenchymatous conjunctival xerosis except?

Vitamin A deficiency. ### Explanation To answer this question, it is essential to distinguish between the two types of conjunctival xerosis: **Epithelial** and **Parenchymatous**. **1. Why Vitamin A Deficiency is the Correct Answer:** Vitamin A deficiency (Xerophthalmia) causes **Epithelial Xerosis**. In this condition, the xerosis is a result of a lack of Vitamin A, which is essential for maintaining the health of the conjunctival epithelium and goblet cells. Crucially, the underlying conjunctival stroma (parenchyma) remains healthy, and there is **no scarring** of the sub-epithelial tissues. This is why the condition is reversible with Vitamin A supplementation. **2. Why the other options are incorrect (Parenchymatous Xerosis):** Parenchymatous xerosis occurs following **cicatrization (scarring)** of the conjunctiva, which leads to the destruction of goblet cells and the ducts of the lacrimal glands. * **Stevens-Johnson Syndrome (SJS):** A severe mucocutaneous reaction that leads to extensive conjunctival scarring and symblepharon. * **Trachoma:** Specifically Stage IV (healed trachoma), where cicatrization of the conjunctiva (Arlt’s line) leads to permanent structural damage. * **Diphtheric Membranous Conjunctivitis:** This is a necrotizing inflammation. The healing process involves extensive fibrosis and scarring of the conjunctival parenchyma. **Clinical Pearls for NEET-PG:** * **Bitot’s Spots:** Characteristic of Vitamin A deficiency; they are triangular, foamy patches found on the bulbar conjunctiva (usually temporal). * **Pemphigoid:** Another common cause of parenchymatous xerosis due to chronic cicatrization. * **Key Differentiator:** If the question mentions **scarring, symblepharon, or chemical burns**, think **Parenchymatous**. If it mentions **malnutrition or night blindness**, think **Epithelial**.

Q: Epidemic keratoconjunctivitis is caused by:

Adenovirus. **Explanation:** **Epidemic Keratoconjunctivitis (EKC)** is a highly contagious viral infection of the ocular surface. The correct answer is **Adenovirus**, specifically **serotypes 8, 19, and 37**. EKC is characterized by sudden onset follicular conjunctivitis, significant eyelid edema, and preauricular lymphadenopathy. A hallmark of this condition is the development of **multifocal subepithelial corneal infiltrates**, which are immune-mediated and can persist for months, causing blurred vision and glare. **Why other options are incorrect:** * **Neisseria gonorrhoeae:** Causes hyperacute purulent conjunctivitis, characterized by profuse "creamy" discharge and a high risk of rapid corneal perforation. * **Corynebacterium diphtheriae:** Known for causing **true membranous conjunctivitis**. It produces a thick, greyish-white membrane on the palpebral conjunctiva that bleeds upon peeling. * **Mycobacterium tuberculosis:** Rarely involves the conjunctiva; when it does, it typically presents as a chronic granulomatous conjunctivitis or a Parinaud oculoglandular syndrome, rather than an acute epidemic. **High-Yield Clinical Pearls for NEET-PG:** * **Rule of 8:** EKC is often associated with Adenovirus type 8; symptoms typically appear 8 days after exposure, and keratitis often appears 8 days after the onset of conjunctivitis. * **Transmission:** Highly contagious via respiratory droplets or contaminated fingers/ophthalmic instruments (e.g., tonometers). * **Pharyngoconjunctival Fever (PCF):** Also caused by Adenovirus (serotypes 3, 4, 7), but presents with a triad of fever, pharyngitis, and follicular conjunctivitis (more common in children). * **Management:** Primarily supportive (cold compresses, artificial tears). Steroids are reserved for visually significant subepithelial infiltrates.

Q: Which of the following is NOT true about phlyctenular conjunctivitis?

Allergens can be endogenous or exogenous.. ### Explanation **Phlyctenular Conjunctivitis** is an allergic nodular inflammation of the conjunctiva and cornea. Understanding its pathophysiology is crucial for NEET-PG. **1. Why Option B is the Correct Answer (The False Statement):** The allergens in phlyctenular conjunctivitis are strictly **endogenous** (internal to the body). The condition is a delayed hypersensitivity response to a protein to which the patient’s tissues have been previously sensitized. It is **not** caused by exogenous (external) allergens like pollen or dust. Historically, the most common endogenous allergen was *Mycobacterium tuberculosis*; however, currently, *Staphylococcus aureus* (from chronic blepharitis) is the most frequent cause. **2. Analysis of Other Options:** * **Option A:** It is indeed a **Type IV (Delayed) cell-mediated hypersensitivity** reaction. This distinguishes it from Vernal Keratoconjunctivitis (Type I). * **Option C:** Epidemiologically, the incidence is significantly **higher in girls** than in boys, typically affecting children and young adults (age 5–15 years). * **Option D:** The hallmark lesion is a **phlycten**—a small, pinkish-white nodule surrounded by a zone of hyperemia. These typically occur at or **near the limbus**. **3. Clinical Pearls for NEET-PG:** * **Triad of Symptoms:** Photophobia, lacrimation, and blepharospasm (especially severe if the cornea is involved). * **Fascicular Ulcer:** A characteristic "serpiginous" corneal ulcer that carries a leash of blood vessels behind it. * **Treatment:** Topical steroids are the mainstay for the ocular lesion, but treating the **underlying cause** (e.g., TB screening or treating Staphylococcal blepharitis) is mandatory to prevent recurrence. * **Differential Diagnosis:** Must be distinguished from Episcleritis (which blanches with adrenaline) and Pingueculitis.

Q: Giant papillary conjunctivitis occurs as an allergic response to all except:

Intraocular lens. **Explanation:** **Giant Papillary Conjunctivitis (GPC)** is a localized Type I (IgE-mediated) and Type IV (cell-mediated) hypersensitivity reaction. The primary trigger is **chronic mechanical irritation** of the superior palpebral conjunctiva by a foreign body, combined with the accumulation of proteinaceous deposits on the surface of that object. **Why Intraocular Lens (IOL) is the correct answer:** An IOL is surgically implanted **inside** the eye (within the capsular bag or anterior chamber). Because it is sequestered from the palpebral conjunctiva by the cornea and iris, it does not come into physical contact with the conjunctival lining of the eyelids. Therefore, it cannot cause the mechanical friction or immunological stimulus required to trigger GPC. **Why the other options are incorrect:** * **Contact Lenses (Option A):** The most common cause of GPC. The lens surface (especially soft lenses) rubs against the tarsal conjunctiva during blinking. * **Prosthesis (Option C):** Ocular prostheses in anophthalmic sockets are large, rigid surfaces that frequently cause mechanical irritation and protein buildup, leading to GPC. * **Nylon Sutures (Option D):** Protruding or "buried" monofilament nylon sutures (e.g., after cataract or corneal surgery) act as a focal mechanical irritant to the upper eyelid, causing localized papillary hypertrophy. **High-Yield Clinical Pearls for NEET-PG:** * **Clinical Feature:** Characterized by "giant" papillae (>1 mm in diameter) on the **upper tarsal conjunctiva**, often described as a "cobblestone" appearance. * **Symptoms:** Itching, ropy discharge, and contact lens intolerance (the lens may move excessively due to papillae "gripping" it). * **Management:** Discontinue contact lens wear (primary step), switch to daily disposables, and use topical mast cell stabilizers or antihistamines.

Q: Chlamydia trachomatis serovars A-C will cause which of the following?

Trachoma. **Explanation:** **Trachoma** is a chronic keratoconjunctivitis caused by *Chlamydia trachomatis*. The serovars of *C. trachomatis* are highly specific to the clinical syndromes they produce: * **Serovars A, B, Ba, and C:** Cause **Trachoma** (Endemic/Hyperendemic trachoma), which is a leading cause of preventable blindness worldwide. It is characterized by follicles, papillary hypertrophy, and eventual cicatrization (scarring). * **Serovars D–K:** Cause **Inclusion Conjunctivitis** (Paratrachoma) in adults and **Ophthalmia Neonatorum** in newborns. These are typically transmitted via genital secretions. * **Serovars L1, L2, and L3:** Cause **Lymphogranuloma Venereum (LGV)**. **Analysis of Incorrect Options:** * **A. Ophthalmia Neonatorum:** While *C. trachomatis* is a common cause, it is specifically caused by **serovars D–K** (acquired during birth from an infected birth canal). * **B. Vernal Keratoconjunctivitis (VKC):** This is a Type-1 hypersensitivity reaction (allergic) to exogenous allergens like pollen, not an infectious process. * **C. Paratrachoma:** Also known as Adult Inclusion Conjunctivitis, this is caused by **serovars D–K** and is usually associated with a concomitant urogenital infection. **High-Yield Clinical Pearls for NEET-PG:** * **SAFE Strategy for Trachoma:** **S**urgery (for trichiasis), **A**ntibiotics (Azithromycin 20mg/kg single dose), **F**acial cleanliness, **E**nvironmental improvement. * **Arlt’s Line:** Horizontal scar in the sulcus subtarsalis (pathognomonic for Trachoma). * **Herbert’s Pits:** Healed follicles at the limbus. * **WHO Grading (FISTO):** **F**ollicles, **I**ntense inflammation, **S**carring, **T**richiasis, **O**pacity (Corneal).

Question 1

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

Accepted Answer

Acute bacterial conjunctivitis

Answer

Acute iritis

Answer

Acute glaucoma

Answer

Scleritis

Question 2

A 19-year-old woman presents with recurrent conjunctivitis occurring annually in early summer and lasting for approximately six weeks. Which of the following is the most appropriate drug for this condition?

Accepted Answer

Antazoline

Answer

Atropine

Answer

Pilocarpine

Answer

Phenylephrine

Question 3

Deficiency of the mucin layer of the tear film occurs in which of the following conditions?

Accepted Answer

Keratoconjunctivitis sicca

Answer

Lacrimal gland removal

Answer

Canalicular block

Answer

Herpetic keratitis

Question 4

Ligneous conjunctivitis is caused by:

Accepted Answer

Membranous conjunctivitis

Answer

Purulent conjunctivitis

Answer

Angular conjunctivitis

Answer

Phlyctenular conjunctivitis

Question 5

All are known to produce parenchymatous conjunctival xerosis except?

Accepted Answer

Vitamin A deficiency

Answer

Stevens-Johnson syndrome

Answer

Trachoma

Answer

Diphtheric membranous conjunctivitis

Question 6

Epidemic keratoconjunctivitis is caused by:

Accepted Answer

Adenovirus

Answer

Neisseria gonorrhoeae

Answer

Corynebacterium diphtheriae

Answer

Mycobacterium tuberculosis

Question 7

Which of the following is NOT true about phlyctenular conjunctivitis?

Accepted Answer

Allergens can be endogenous or exogenous.

Answer

It is a Type IV cell-mediated hypersensitivity reaction.

Answer

The incidence is higher in girls than in boys.

Answer

Nodular lesions typically occur near the limbus.

Question 8

Giant papillary conjunctivitis occurs as an allergic response to all except:

Accepted Answer

Intraocular lens

Answer

Contact lens

Answer

Prosthesis

Answer

Nylon sutures

Question 9

Unilateral chronic conjunctivitis may be associated with which of the following?

Accepted Answer

Foreign body retained in the fornix

Answer

Habit of smoking

Answer

Use of a uniocular microscope

Answer

Unilateral aphakia

Question 10

Chlamydia trachomatis serovars A-C will cause which of the following?

Accepted Answer

Trachoma

Answer

Ophthalmia Neonatorum

Answer

Vernal Keratoconjunctivitis

Answer

Paratrachoma

Diseases of the Conjunctiva — MCQs

Diseases of the Conjunctiva — MCQs

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