Diseases of the Conjunctiva Practice Questions

Q: Which of the following statements regarding acute conjunctivitis is FALSE?

Vision is typically unaffected.. ***Vision is typically unaffected.*** - In the context of this question, this is considered the **false statement** because vision is often **mildly blurred** or reduced due to the presence of **mucopurulent discharge** or debris over the cornea. - A key diagnostic feature is that this visual blurring **clears with blinking**, unlike vision loss from corneal or intraocular pathologies. *The cornea may be infiltrated.* - This is a true statement as certain forms of conjunctivitis, particularly **adenoviral infections**, can lead to **superficial punctate keratitis** or subepithelial infiltrates. - **Marginal infiltrates** can also occur in bacterial conjunctivitis due to a hypersensitivity reaction to bacterial toxins. *Topical antibiotics are often the treatment of choice.* - This is true because **broad-spectrum topical antibiotics** (e.g., fluoroquinolones) are commonly prescribed to treat bacterial causes and prevent secondary infections. - They also play a role in reducing the **contagion risk** and shortening the clinical course of the disease. *The pupil is usually unaffected.* - This is true; the pupil remains **normally reactive** to light in conjunctivitis, which helps differentiate it from serious conditions like **acute glaucoma** (dilated) or **uveitis** (miotic). - The absence of pupillary changes confirms that the inflammation is localized to the **conjunctival surface** rather than the inner ocular structures.

Q: Condition in which the eyelid is adhered to the conjunctiva is:

Symblepharon. **Explanation:** **Symblepharon** is the correct answer. It is a condition characterized by the partial or complete adhesion of the palpebral conjunctiva (lining the eyelid) to the bulbar conjunctiva (covering the eyeball). This occurs when two opposed areas of the conjunctiva lose their epithelial lining due to trauma or inflammation, leading to the formation of permanent adhesions during the healing process. Common causes include chemical burns (especially alkali), Stevens-Johnson Syndrome (SJS), and Ocular Cicatricial Pemphigoid (OCP). **Analysis of Incorrect Options:** * **Ankyloblepharon:** This refers to the adhesion of the upper and lower **eyelid margins** to each other, narrowing the palpebral fissure. It does not involve the eyeball itself. * **Trichiasis:** This is a condition where the eyelashes are misdirected and grow inward, rubbing against the cornea or conjunctiva, often causing irritation and ulceration. * **Madarosis:** This refers to the partial or complete loss of eyelashes (cilia) or eyebrows. Common causes include leprosy, blepharitis, and chemotherapy. **High-Yield Clinical Pearls for NEET-PG:** * **Pseudo-symblepharon:** A fold of conjunctiva bridges the fornix and attaches to the cornea (seen in chemical burns), but a probe can be passed beneath it (unlike a true symblepharon). * **Prevention:** In the acute phase of chemical burns, a **glass rod** is used with lubricant to break early adhesions and prevent symblepharon formation. * **Surgical Management:** Severe cases require the use of an **Amniotic Membrane Graft (AMG)** or Mucous Membrane Graft to reconstruct the fornix.

Q: Giant papillary conjunctivitis is most commonly seen in association with which of the following?

Soft contact lens wear. **Explanation:** **Giant Papillary Conjunctivitis (GPC)** is a chronic inflammatory condition characterized by large papillae (greater than 1 mm in diameter) on the superior tarsal conjunctiva. **1. Why Soft Contact Lens is Correct:** The most common association for GPC is **Soft Contact Lens (SCL) wear**. The pathogenesis is multifactorial, involving both **mechanical irritation** (the lens edge rubbing against the tarsal conjunctiva) and an **immune-mediated hypersensitivity reaction** (Type I and Type IV) to protein deposits (biofilms) that accumulate more readily on the surface of soft lenses compared to other materials. **2. Analysis of Incorrect Options:** * **Allergic response to M. tuberculosis:** This describes **Phlyctenular Keratoconjunctivitis**, which is a Type IV hypersensitivity reaction to endogenous bacterial proteins (most commonly TB or Staphylococcus). * **Intacs corneal implants:** While any foreign body (like exposed sutures or ocular prosthetics) can cause GPC, it is statistically much less common than SCL-induced cases. * **Rigid Gas Permeable (RGP) lens wear:** Although RGP lenses can cause GPC, the incidence is significantly lower than with soft lenses because RGP lenses are smaller, move more freely, and accumulate fewer protein deposits. **3. NEET-PG High-Yield Pearls:** * **Clinical Feature:** "Cobblestone" papillae on the upper tarsal plate, mucoid discharge, and contact lens intolerance. * **Key Distinction:** Unlike Vernal Keratoconjunctivitis (VKC), GPC is not strictly seasonal and is primarily a foreign-body associated reaction. * **Management:** Discontinue lens wear (primary step), switch to daily disposables, and use topical mast cell stabilizers or antihistamines. * **Differential:** If papillae are found in the **inferior** fornix, think of Chlamydial Conjunctivitis or Toxic Conjunctivitis. GPC and VKC predominantly affect the **superior** tarsus.

Q: What is the specific topical remedy suggested for angular conjunctivitis?

Zinc sulphate. **Explanation:** **Angular Conjunctivitis** is a specific type of chronic conjunctivitis characterized by inflammation limited to the intermarginal strip at the inner or outer canthi. **Why Zinc Sulphate is the Correct Answer:** The primary causative organism is **Morax-Axenfeld bacillus** (*Moraxella lacunata*). This bacterium produces a **proteolytic enzyme** (protease) that macerates the epithelium of the conjunctiva and the skin around the angles of the eye. **Zinc sulphate** acts as a specific remedy because it inhibits the action of this proteolytic enzyme, thereby arresting the tissue maceration and allowing the epithelium to heal. It is typically used as 0.25% drops. **Analysis of Incorrect Options:** * **Dexamethasone (A):** This is a potent steroid. While it reduces inflammation, it does not address the underlying bacterial cause or the specific enzymatic action of *Moraxella*, and its use can lead to complications like secondary infections or glaucoma. * **Sulphacetamide (B):** While a bacteriostatic sulfonamide, it is not the specific treatment of choice for the enzymatic pathology of angular conjunctivitis. * **Penicillin (D):** Most strains of *Moraxella* are not specifically targeted by topical penicillin, and penicillin is rarely used topically due to the high risk of hypersensitivity reactions. **High-Yield Clinical Pearls for NEET-PG:** * **Causative Organism:** *Moraxella lacunata* (Gram-negative diplobacillus). Occasionally, *Staphylococcus aureus* can cause a similar clinical picture. * **Clinical Feature:** Redness at the angles of the eye with excoriation of the surrounding skin. * **Reservoir:** The organism often inhabits the **nasal cavity**; hence, treating associated nasal infections is important to prevent recurrence. * **Modern Treatment:** While Zinc is the classic "specific" remedy, modern practice often combines it with an antibiotic like **Oxytetracycline** or **Erythromycin**.

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

Papillary hypertrophy. **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. ### **Explanation of Options** * **C. Papillary Hypertrophy (Correct):** This is the hallmark clinical feature of VKC. It occurs due to the proliferation of conjunctival epithelium and inflammatory cell infiltration. In the **Palpebral form**, these papillae enlarge to form a "cobblestone" or "pavement stone" appearance, typically on the upper tarsal conjunctiva. * **A. Shield Ulcer:** While this *is* a feature of VKC, it is a **complication** involving the cornea (keratopathy) rather than a primary conjunctival feature. It is a sterile, oval, transverse ulcer in the upper part of the cornea. * **B. Horner–Trantas Spots:** These are white, elevated dots found at the limbus (Limbal form) consisting of eosinophils and epithelial debris. While characteristic of VKC, papillary hypertrophy is the more fundamental pathological feature of the disease. * **D. Herbert Pits:** These are pathognomonic for **Trachoma** (Stage IV). They represent scarred follicles at the limbus and are not seen in VKC. ### **NEET-PG High-Yield Pearls** * **Demographics:** Most common in males (4:1 ratio), aged 5–15 years. * **Symptoms:** Intense itching (most common), ropy (stringy) discharge, and photophobia. * **Maxwell-Lyons Sign:** A thin film of fibrin (pseudomembrane) covering the papillae. * **Treatment:** Mast cell stabilizers (Sodium Cromoglycate) for prophylaxis; topical steroids for acute exacerbations; Cyclosporine/Tacrolimus for steroid-sparing. * **Key Distinction:** **Papillae** (vascular core) are seen in VKC/Allergy; **Follicles** (avascular lymphoid aggregates) are seen in Viral/Chlamydial infections.

Q: Which of the following is NOT a sequela of trachoma?

Proptosis. **Explanation:** Trachoma, caused by *Chlamydia trachomatis* (serotypes A, B, Ba, and C), is a chronic keratoconjunctivitis characterized by progressive scarring. **Why Proptosis is the correct answer:** **Proptosis** (forward protrusion of the eyeball) is typically caused by orbital pathologies such as tumors, cellulitis, or thyroid eye disease. Trachoma is a disease confined to the **superficial ocular surface** (conjunctiva and cornea) and the lacrimal drainage system. It does not involve the retrobulbar orbital tissues; therefore, it cannot cause proptosis. **Analysis of Incorrect Options:** * **Tylosis:** This refers to the thickening of the eyelid margin. In chronic trachoma, long-term inflammation and scarring lead to hypertrophy and thickening of the lids. * **Pseudocyst:** Also known as "Leber’s cells" or "Post-trachomatous debris," these are clear, cystic spaces formed when the conjunctival epithelium becomes trapped within the subepithelial fibrous tissue during the scarring process. * **Dacrocystitis:** Trachomatous scarring can involve the lacrimal puncta and the nasolacrimal duct, leading to obstruction. This stasis of tears predisposes the patient to chronic dacrocystitis. **High-Yield Clinical Pearls for NEET-PG:** * **Arlt’s Line:** A horizontal line of scarring on the superior palpebral conjunctiva (pathognomonic). * **Herbert’s Pits:** Scarred-down limbal follicles (pathognomonic). * **SAFE Strategy:** WHO-recommended management (**S**urgery, **A**ntibiotics—Azithromycin, **F**acial cleanliness, **E**nvironmental improvement). * **Trichiasis and Entropion:** These are the most common blinding complications due to cicatricial (scarring) changes in the lid.

Q: Spring catarrh may be associated with which of the following conditions?

Keratoconus. **Explanation:** **Vernal Keratoconjunctivitis (VKC)**, commonly known as **Spring Catarrh**, is a bilateral, recurrent, external ocular inflammation primarily affecting young males in warm climates. It is a Type I and Type IV hypersensitivity reaction. **Why Keratoconus is the Correct Answer:** The association between VKC and **Keratoconus** is well-established and frequently tested. The primary mechanism is **chronic mechanical trauma** caused by persistent eye rubbing (the "itch-scratch cycle"). Constant vigorous rubbing leads to thinning and weakening of the corneal stroma, resulting in progressive ectasia (Keratoconus). Additionally, inflammatory mediators in the tear film of VKC patients may further contribute to stromal degradation. **Analysis of Incorrect Options:** * **A. Anterior subcapsular cataract:** VKC is associated with **Posterior Subcapsular Cataract (PSC)**, not anterior. This is usually an iatrogenic complication resulting from the prolonged use of topical steroids to manage the allergic inflammation. * **C. Interstitial keratitis:** This is a deep corneal inflammation typically associated with congenital syphilis, tuberculosis, or viral infections (like HSV), rather than allergic conjunctivitis. **High-Yield Clinical Pearls for NEET-PG:** * **Hallmark Symptom:** Intense itching (worse in spring/summer). * **Key Signs:** Cobblestone papillae (Palpebral form), Horner-Trantas dots (Limbal form), and **Shield Ulcer** (a sterile, transverse oval ulcer on the upper cornea). * **Maxwell-Lyons Sign:** A ropy, whitish discharge characteristic of VKC. * **Treatment:** Mast cell stabilizers (Prophylaxis), Topical Antihistamines, and judicious use of Topical Steroids or Cyclosporine.

Q: A 26-year-old female presented with complaints of coloured halos, matted and sticky eyelids for 3 days. On examination, visual acuity was normal. What is the most common organism causing this condition?

Staphylococcus aureus. ### Explanation The clinical presentation of **matted, sticky eyelids** (due to mucopurulent discharge) and **colored halos** in the presence of **normal visual acuity** is characteristic of **Acute Mucopurulent Conjunctivitis**. **1. Why Staphylococcus aureus is correct:** *Staphylococcus aureus* is the most common cause of bacterial conjunctivitis worldwide. The "colored halos" in this condition are **lenticular halos** (false halos), caused by the accumulation of mucus flakes on the corneal surface. These flakes act as a prism, dispersing light. Unlike glaucoma, these halos disappear after washing the eyes or blinking. The sticky eyelids (matting of lashes) result from the drying of discharge during sleep. **2. Analysis of Incorrect Options:** * **Neisseria gonorrhoeae:** Causes **Hyperacute Purulent Conjunctivitis**. It is characterized by profuse, thick, creamy pus and carries a high risk of corneal perforation. It is less common than Staphylococcal infections. * **Streptococcus pneumoniae:** Often associated with **hypopyon ulcers** or dacryocystitis. While it can cause conjunctivitis (historically linked to epidemics in temperate climates), it is not as common as *S. aureus*. * **Streptococcus hemolyticus:** A less frequent cause of acute conjunctivitis compared to the other options listed. **3. NEET-PG High-Yield Pearls:** * **Differential Diagnosis of Halos:** Always differentiate "Mucus Halos" (conjunctivitis) from "Edematous Halos" (Acute Congestive Glaucoma). In conjunctivitis, vision is normal and halos disappear with blinking. * **Commonest cause of Ophthalmia Neonatorum:** *Chlamydia trachomatis* (globally). * **Commonest cause of Membranous Conjunctivitis:** *Corynebacterium diphtheriae*. * **Commonest cause of Pseudomembranous Conjunctivitis:** Adenovirus (EKC) or *Staphylococci*.

Q: A 67-year-old man complains of a lesion in his left eye. Physical examination reveals a triangular fold of vascularized conjunctiva growing horizontally into the cornea in the shape of an insect wing. Which of the following terms best describes this patient's lesion?

Pterygium. **Explanation** The correct answer is **Pterygium**. **1. Why Pterygium is correct:** A pterygium is a triangular, wing-shaped (the name is derived from the Greek word *pteryx*, meaning wing) fold of fibrovascular conjunctiva that grows onto the cornea. It typically occurs in the interpalpebral fissure, most commonly on the nasal side. The hallmark of this condition is that it involves a **limbal stem cell deficiency** and invades **Bowman’s layer** of the cornea. The description of a "vascularized conjunctiva growing horizontally" is a classic clinical presentation. **2. Why the other options are incorrect:** * **Pinguecula:** This is a yellowish-white, amorphous deposit of degenerated collagen in the bulbar conjunctiva. Unlike pterygium, it **does not** grow onto the cornea. * **Loiasis:** Caused by the nematode *Loa loa*, this presents as a "Calabar swelling" or a visible subconjunctival worm moving across the eye, rather than a fixed fibrovascular growth. * **Onchocerciasis:** Caused by *Onchocerca volvulus* ("River Blindness"), it primarily affects the cornea (sclerosing keratitis) and posterior segment, but does not present as a wing-shaped conjunctival fold. **3. High-Yield Clinical Pearls for NEET-PG:** * **Etiology:** Strongly associated with chronic UV light exposure (UV-B) and dry, dusty environments. * **Stocker’s Line:** An iron deposition line seen on the corneal epithelium at the leading edge of a pterygium (indicates stability). * **Fuchs' Islets:** Small, white, precursor patches found at the leading edge. * **Management:** Surgical excision is indicated if it threatens the visual axis or causes significant astigmatism. The "Gold Standard" technique to prevent recurrence is **Conjunctival Autograft (CAG)**, often secured with fibrin glue.

Question 1

A 58-year-old hypertensive woman presents with sudden painless loss of vision in her left eye noticed on waking. Her blood pressure is 168/96 mmHg. There is no relative afferent pupillary defect. The fundus photograph of the left eye shows diffuse venous tortuosity and widespread retinal hemorrhages in all four quadrants, consistent with central retinal vein occlusion (Image 3). Which of the following investigations is most important to guide immediate management and reduce the risk of neovascular complications?

Accepted Answer

A. Fluorescein angiography to assess retinal capillary non-perfusion

Answer

B. B-scan ultrasonography to exclude posterior vitreous detachment

Answer

C. Optical coherence tomography of the optic nerve head for cup-to-disc ratio

Answer

D. Carotid Doppler ultrasound to exclude ipsilateral carotid stenosis

Question 2

Which of the following statements regarding acute conjunctivitis is FALSE?

Accepted Answer

Vision is typically unaffected.

Answer

The cornea may be infiltrated.

Answer

Topical antibiotics are often the treatment of choice.

Answer

The pupil is usually unaffected.

Question 3

Condition in which the eyelid is adhered to the conjunctiva is:

Accepted Answer

Symblepharon

Answer

Ankyloblepharon

Answer

Trichiasis

Answer

Madarosis

Question 4

Giant papillary conjunctivitis is most commonly seen in association with which of the following?

Accepted Answer

Soft contact lens wear

Answer

Allergic response to Mycobacterium tuberculosis

Answer

Intacs corneal implants

Answer

Rigid gas permeable lens wear

Question 5

What is the specific topical remedy suggested for angular conjunctivitis?

Accepted Answer

Zinc sulphate

Answer

Dexamethasone

Answer

Sulphacetamide

Answer

Penicillin

Question 6

Which of the following are features of vernal conjunctivitis?

Accepted Answer

Papillary hypertrophy

Answer

Shield ulcer

Answer

Horner–Trantas spots

Answer

Herbert pits

Question 7

Which of the following is NOT a sequela of trachoma?

Accepted Answer

Proptosis

Answer

Tylosis

Answer

Pseudocyst

Answer

Dacrocystitis

Question 8

Spring catarrh may be associated with which of the following conditions?

Accepted Answer

Keratoconus

Answer

Anterior subcapsular cataract

Answer

Interstitial keratitis

Answer

All of the above

Question 9

A 26-year-old female presented with complaints of coloured halos, matted and sticky eyelids for 3 days. On examination, visual acuity was normal. What is the most common organism causing this condition?

Accepted Answer

Staphylococcus aureus

Answer

Neisseria gonorrhoeae

Answer

Streptococcus pneumoniae

Answer

Streptococcus hemolyticus

Question 10

A 67-year-old man complains of a lesion in his left eye. Physical examination reveals a triangular fold of vascularized conjunctiva growing horizontally into the cornea in the shape of an insect wing. Which of the following terms best describes this patient's lesion?

Accepted Answer

Pterygium

Answer

Loiasis

Answer

Onchocerciasis

Answer

Pinguecula

Diseases of the Conjunctiva — MCQs

Diseases of the Conjunctiva — MCQs

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