Diseases of the Conjunctiva Practice Questions

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: Maximum density of goblet cells is seen in which part of the conjunctiva?

Nasal conjunctiva. **Explanation:** The conjunctival epithelium contains specialized unicellular mucous glands known as **Goblet cells**. These cells are responsible for secreting the **mucin layer** of the tear film, which is essential for maintaining the stability of the precorneal tear film and ensuring the ocular surface remains lubricated. **Why Nasal Conjunctiva is Correct:** Histological studies and impression cytology have demonstrated that the density of goblet cells is not uniform across the conjunctiva. The **highest concentration** is found in the **nasal conjunctiva**, specifically in the **inferonasal quadrant** and near the **caruncle/semilunar fold**. This high density is thought to facilitate the efficient trapping of debris and its transport toward the lacrimal puncta for drainage. **Analysis of Incorrect Options:** * **Superior and Temporal Conjunctiva:** While goblet cells are present in these regions, their density is significantly lower compared to the nasal and inferior aspects. * **Inferior Conjunctiva:** The inferior conjunctiva (specifically the inferior fornix) has a high density of goblet cells, but it is second to the nasal quadrant. **High-Yield Clinical Pearls for NEET-PG:** * **Origin:** Goblet cells are derived from the basal layer of the conjunctival epithelium. * **Staining:** They are best visualized using **PAS (Periodic Acid-Schiff)** stain due to their high carbohydrate (mucin) content. * **Clinical Correlation:** A deficiency in goblet cells leads to **mucin deficiency dry eye**, commonly seen in conditions like **Vitamin A deficiency (Bitot’s spots)**, Stevens-Johnson Syndrome, and Ocular Cicatricial Pemphigoid. * **Location Trend:** Density increases from the limbus toward the fornices (except at the lid margin).

Q: Coloured halos are seen in all, except?

Mucopurulent conjunctivitis. **Explanation:** The phenomenon of **colored halos** occurs due to the diffraction of light as it passes through an edematous cornea or accumulated debris. **Why Mucopurulent Conjunctivitis is the correct answer:** In mucopurulent conjunctivitis, colored halos are **not** a true clinical feature. While patients may complain of blurred vision or "halos" due to mucus flakes/discharge over the cornea, these disappear immediately upon **blinking** or washing the eyes (Fincham’s Test negative). Therefore, they are considered "false halos." **Analysis of Incorrect Options:** * **Glaucoma (Acute Congestive):** This is the most classic cause. High intraocular pressure leads to **corneal edema**. The fluid droplets in the epithelium act as prisms, splitting white light into spectral colors (Fincham’s Test positive). * **Acute Anterior Uveitis:** While less common than in glaucoma, inflammatory cells and protein (flare) in the aqueous humor or mild secondary corneal edema can occasionally cause light diffraction. * **Tetracycline:** Certain drugs, including Tetracycline and Amiodarone, can cause **corneal deposits** (cornea verticillata) or lens changes that result in the perception of colored halos. **NEET-PG High-Yield Pearls:** 1. **Fincham’s Test:** Used to differentiate Glaucomatous halos from Cataractous halos. * Passing a stenopaic slit across the pupil: If halos persist and break into segments, it is **Cataract** (lenticular). If the halo remains intact but diminishes in intensity, it is **Glaucoma** (corneal). 2. **Differential Diagnosis of Colored Halos:** * **Corneal Edema:** Acute Glaucoma, Bullous Keratopathy. * **Lens Changes:** Early stages of Immature Senile Cataract. * **Deposits:** Pigmentary dispersion syndrome, certain drugs. 3. **Key Distinguisher:** Halos in conjunctivitis are cleared by blinking; halos in glaucoma are not.

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**.

Question 1

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 2

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

Accepted Answer

Symblepharon

Answer

Ankyloblepharon

Answer

Trichiasis

Answer

Madarosis

Question 3

Maximum density of goblet cells is seen in which part of the conjunctiva?

Accepted Answer

Nasal conjunctiva

Answer

Superior conjunctiva

Answer

Inferior conjunctiva

Answer

Temporal conjunctiva

Question 4

Coloured halos are seen in all, except?

Accepted Answer

Mucopurulent conjunctivitis

Answer

Acute anterior uveitis

Answer

Tetracycline

Answer

Glaucoma

Question 5

What is the specific topical remedy suggested for angular conjunctivitis?

Accepted Answer

Zinc sulphate

Answer

Dexamethasone

Answer

Sulphacetamide

Answer

Penicillin

Diseases of the Conjunctiva — MCQs

Diseases of the Conjunctiva — MCQs

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