Diseases of the Conjunctiva Practice Questions

Q: Not a feature of ligneous conjunctivitis:

Bacterial origin. ***Bacterial origin*** - Ligneous conjunctivitis is a rare genetic disorder caused by a **plasminogen deficiency**, not a bacterial infection. - The membranes are formed by the deposition of **fibrin** due to impaired fibrinolysis. *Wood-like membranes* - This is a hallmark feature of ligneous conjunctivitis, describing the **firm, thick, and confluent pseudomembranes** that develop on the conjunctiva. - These membranes are due to excessive **fibrin deposition** that cannot be effectively cleared. *Plasminogen deficiency* - Ligneous conjunctivitis is associated with a **genetic defect in plasminogen**, an enzyme crucial for fibrinolysis. - The deficiency leads to the impaired breakdown of fibrin, resulting in the characteristic membranes. *Recurrent nature* - The disease is known for its **recurrent formation of membranes**, even after surgical removal. - This recurrence is due to the underlying persistent **plasminogen deficiency**.

Q: A 25-year-old male presents with recurrent bilateral conjunctival hyperemia and a gritty sensation. Likely diagnosis?

Vernal keratoconjunctivitis. ***Vernal keratoconjunctivitis*** * This is the correct diagnosis as it perfectly matches the clinical presentation: **young male patient** (VKC has male predominance, especially in adolescents/young adults), **recurrent course** (VKC is a chronic allergic condition with seasonal exacerbations), and **bilateral involvement** with gritty sensation. * VKC is a **severe form of allergic conjunctivitis** characterized by **bilateral conjunctival hyperemia**, intense itching, gritty sensation, photophobia, and mucoid discharge. The recurrent bilateral nature in a young male is pathognomonic. *Herpes keratitis* * Usually presents as **unilateral eye pain**, redness, and a characteristic **dendritic ulcer** on the cornea (seen with fluorescein staining), which is not described here. * Caused by herpes simplex virus and typically has an acute presentation rather than recurrent bilateral conjunctival symptoms. Can lead to significant vision loss if untreated. *Episcleritis* * Characterized by **localized sectorial redness** in one eye, often in a radial pattern, and is usually **mild and self-limiting**. * Typically causes minimal discomfort and does not commonly present with gritty sensation or recurrent bilateral involvement as the primary feature. *Bacterial conjunctivitis* * Typically presents with **purulent discharge** (thick yellow-green pus) and matting of eyelids, which is not mentioned in this patient's symptoms. * While it causes redness and grittiness, it's usually **acute and unilateral or sequential bilateral** (one eye then the other), and resolves with topical antibiotics within days, unlike the recurrent chronic nature described here.

Q: Which of the following findings is typically NOT seen in a patient with allergic conjunctivitis?

Purulent discharge. ***Purulent discharge*** - **Purulent discharge** (thick, yellowish, or greenish) is characteristic of **bacterial conjunctivitis** and is usually absent in allergic conjunctivitis. - Allergic conjunctivitis typically presents with a **clear or watery discharge**. *Watery discharge* - **Watery discharge** is a very common symptom of **allergic conjunctivitis**, often accompanied by itching and redness. - It results from the inflammatory response and increased lacrimation due to allergen exposure. *Itching* - **Ocular itching** is the hallmark symptom of allergic conjunctivitis and is considered its most distinctive feature. - It is caused by the release of **histamine** and other inflammatory mediators from mast cells in response to allergens. *Bilateral eye redness* - **Bilateral conjunctival redness** (hyperemia) is a frequent finding in allergic conjunctivitis. - This is due to **vasodilation** in response to the inflammatory process affecting both eyes, as airborne allergens often affect both simultaneously.

Q: A 10-year-old boy presents with itching, redness, and tearing in his eyes, particularly during spring. What is the most likely diagnosis?

Vernal keratoconjunctivitis. ***Vernal keratoconjunctivitis*** - This condition characteristically presents in **children and young adults**, often with a seasonal recurrence (spring) and symptoms of **itching, redness, and tearing**. - It is a severe form of **allergic conjunctivitis** with hallmark signs including **Trantas dots** (white limbal dots) and **cobblestone papillae** on the upper tarsal conjunctiva. *Bacterial conjunctivitis* - Typically presents with a **purulent discharge**, matting of the eyelids (especially in the morning), and is usually not seasonal. - It is often associated with a **bacterial infection**, rather than an allergic response. *Acute iritis* - Manifests with **eye pain, photophobia**, and circumcorneal redness, but typically without the marked **itching** or seasonal recurrence seen here. - It involves inflammation of the **iris and ciliary body**, distinguishable from conjunctival inflammation. *Dry eye syndrome* - Characterized by a gritty sensation, burning, and sometimes paradoxical tearing, but it is less common in childhood and usually lacks the prominent **itching** and strong seasonal component. - This condition is due to inadequate tear production or excessive tear evaporation, not an allergic response.

Q: Which medication is commonly used to treat bacterial conjunctivitis?

Moxifloxacin. ***Moxifloxacin*** - **Moxifloxacin** is a **fourth-generation fluoroquinolone** antibiotic, effective against a broad spectrum of bacteria, including common conjunctivitis pathogens. - It is often prescribed as **ophthalmic drops** for bacterial conjunctivitis due to its good penetration and efficacy. *Acyclovir* - **Acyclovir** is an **antiviral agent** primarily used to treat infections caused by the **herpes simplex virus (HSV)** and **varicella-zoster virus (VZV)**, not bacteria. - It would be indicated for **herpetic keratitis** or **zoster ophthalmicus**, not bacterial conjunctivitis. *Prednisolone* - **Prednisolone** is a **corticosteroid** used to reduce inflammation; it does not have antibacterial properties. - While it can alleviate inflammation, using it alone for bacterial conjunctivitis can worsen the infection by suppressing the immune response. *Timolol* - **Timolol** is a **beta-blocker** primarily used to treat **glaucoma** by reducing intraocular pressure. - It has no role in treating infections such as bacterial conjunctivitis.

Q: A 25-year-old female presents with bilateral eye redness, a burning sensation, and dry eyes. The Schirmer test shows reduced tear production. What is the most likely diagnosis?

Dry eye syndrome. ***Dry eye syndrome*** - The combination of **bilateral eye redness**, **burning sensation**, **dry eyes**, and **reduced tear production** on the **Schirmer test** are classic symptoms of dry eye syndrome. - This condition results from insufficient tear quantity or quality, leading to ocular surface irritation. *Allergic conjunctivitis* - While it causes **red eyes** and **burning**, it is typically associated with **itching**, which is not mentioned in the presentation. - Reduced tear production is not a primary feature; instead, there may be increased watery discharge. *Blepharitis* - This condition involves inflammation of the **eyelid margins** and is characterized by crusting, irritation, and sometimes dryness due to dysfunction of the meibomian glands. - While a burning sensation can occur, the primary finding of **reduced tear production** on the **Schirmer test** points away from isolated blepharitis. *Episcleritis* - Characterized by **localized redness** and discomfort, but typically does not involve a burning sensation or generalized dryness. - There is no reduction in tear production associated with episcleritis.

Q: Which of the following statements about conjunctival lesions is NOT true?

Surgery is treatment of choice. ***Surgery is treatment of choice*** - While surgery can be used to treat conjunctival lesions, it is not always the **treatment of choice**, especially for smaller, asymptomatic lesions like **pinguecula** which may only require observation and lubrication. - Many conjunctival lesions, such as uncomplicated **pterygium** or **pinguecula**, are managed conservatively unless they cause significant symptoms, vision impairment, or cosmetic concerns. *Arise from any part of conjunctiva* - **Conjunctival lesions** can indeed arise from various parts of the conjunctiva, including the palpebral, bulbar, and forniceal conjunctiva. - For example, **pterygium** typically arises from the bulbar conjunctiva, while **pinguecula** also originates in the bulbar conjunctiva, specifically in the interpalpebral fissure. *Can cause Astigmatism* - Larger **conjunctival lesions**, particularly a **pterygium** that encroaches onto the cornea, can induce or alter astigmatism. - The growth of the lesion can change the **curvature of the cornea**, leading to optical distortion and astigmatism. *UV exposure is risk factor* - **Ultraviolet (UV) light exposure** is a well-established risk factor for the development of many conjunctival lesions, including **pterygium** and **pinguecula**. - Chronic UV exposure leads to **elastotic degeneration** of the conjunctival collagen and is thought to play a key role in the pathogenesis of these growths.

Q: In which condition is there a deficiency in the mucin layer of the tear film?

Keratoconjunctivitis sicca (dry eye syndrome). ***Keratoconjunctivitis sicca (dry eye syndrome)*** - Dry eye syndrome has **multiple subtypes**, including **mucin-deficient dry eye** caused by goblet cell dysfunction or loss. - Conditions causing goblet cell damage (Stevens-Johnson syndrome, ocular pemphigoid, vitamin A deficiency, chronic conjunctivitis) lead to **mucin layer deficiency** as a component of dry eye. - The **mucin layer**, produced by conjunctival goblet cells, is essential for tear film adhesion to the corneal epithelium; its deficiency prevents proper wetting even with adequate aqueous. - While aqueous-deficient dry eye is more common, **mucin-deficient dry eye** is a recognized subtype specifically addressing the question. *Aqueous tear deficiency due to lacrimal gland dysfunction* - This specifically describes **aqueous layer deficiency**, not mucin deficiency. - The lacrimal gland produces the aqueous component; this option addresses a different layer of the tear film. - Mucin production by goblet cells would be unaffected in isolated lacrimal gland dysfunction. *Obstruction in tear drainage pathways* - This causes **epiphora** (excessive tearing/overflow), not deficiency of any tear film component. - The problem is impaired drainage through the nasolacrimal system, leading to tear accumulation rather than reduced tear film quality. *Corneal damage due to viral infection* - Viral keratitis causes **epithelial damage and inflammation**, not primary mucin layer deficiency. - While secondary effects on tear film may occur, the underlying pathology is infectious/inflammatory, not goblet cell dysfunction.

Q: What is the primary causative agent of swimming pool conjunctivitis?

Adenovirus type 3. ***Adenovirus type 3*** - **Adenovirus type 3** is the most common cause of **pharyngoconjunctival fever**, often associated with outbreaks in swimming pools. - This condition is characterized by **acute follicular conjunctivitis**, fever, and pharyngitis. *Chlamydia trachomatis* - This bacterium causes **inclusion conjunctivitis**, which is typically associated with **genital infection** and can be transmitted to the eye. - It presents differently than swimming pool conjunctivitis, often with more chronic symptoms and potential for corneal involvement. *Adenovirus type 8* - **Adenovirus type 8** is a common cause of **epidemic keratoconjunctivitis (EKC)**, which is more severe and often involves corneal inflammation and scarring. - While an adenovirus, it is not the primary agent in typical "swimming pool conjunctivitis" outbreaks. *Gonococcus* - **Neisseria gonorrhoeae** causes severe hyperacute purulent conjunctivitis, especially in neonates (**ophthalmia neonatorum**), and can lead to rapid corneal perforation if untreated. - This is a distinct and much more serious condition not typically associated with swimming pools.

Q: Iron deposition line at edge of pterygium on corneal epithelium is known as?

Stocker's line. ***Stocker's line*** - **Stocker's line** is a **corneal iron deposition line** that occurs at the leading edge of a **pterygium**. - It is formed due to the accumulation of **iron pigment** within the **corneal epithelium** as a result of tear film stagnation induced by the elevated pterygium. *KF Ring* - **Kayser-Fleischer (KF) ring** is a **copper deposition** in Descemet's membrane of the **cornea**, indicative of **Wilson's disease**. - It presents as a **golden-brown or green-brown ring** and is not associated with pterygium. *Fleischer ring* - **Fleischer ring** is a **circumferential iron deposition** in the **corneal epithelium** at the base of the **cone in keratoconus**. - This ring occurs due to tear film pooling at the base of the ectatic cornea, leading to iron accumulation, and is distinct from pterygium-associated iron lines. *Ferry's line* - **Ferry's line** is an **iron deposition line** seen in the **corneal epithelium** around the **filtering bleb after glaucoma surgery**. - It is also caused by tear film alterations and iron accumulation, but its location and etiology differ from Stocker's line.

Question 1

Not a feature of ligneous conjunctivitis:

Accepted Answer

Bacterial origin

Answer

Wood-like membranes

Answer

Plasminogen deficiency

Answer

Recurrent nature

Question 2

A 25-year-old male presents with recurrent bilateral conjunctival hyperemia and a gritty sensation. Likely diagnosis?

Accepted Answer

Vernal keratoconjunctivitis

Answer

Herpes keratitis

Answer

Episcleritis

Answer

Bacterial conjunctivitis

Question 3

Which of the following findings is typically NOT seen in a patient with allergic conjunctivitis?

Accepted Answer

Purulent discharge

Answer

Watery discharge

Answer

Itching

Answer

Bilateral eye redness

Question 4

A 10-year-old boy presents with itching, redness, and tearing in his eyes, particularly during spring. What is the most likely diagnosis?

Accepted Answer

Vernal keratoconjunctivitis

Answer

Bacterial conjunctivitis

Answer

Acute iritis

Answer

Dry eye syndrome

Question 5

Which medication is commonly used to treat bacterial conjunctivitis?

Accepted Answer

Moxifloxacin

Answer

Acyclovir

Answer

Prednisolone

Answer

Timolol

Question 6

A 25-year-old female presents with bilateral eye redness, a burning sensation, and dry eyes. The Schirmer test shows reduced tear production. What is the most likely diagnosis?

Accepted Answer

Dry eye syndrome

Answer

Allergic conjunctivitis

Answer

Blepharitis

Answer

Episcleritis

Question 7

Which of the following statements about conjunctival lesions is NOT true?

Accepted Answer

Surgery is treatment of choice

Answer

Arise from any part of conjunctiva

Answer

Can cause Astigmatism

Answer

UV exposure is risk factor

Question 8

In which condition is there a deficiency in the mucin layer of the tear film?

Accepted Answer

Keratoconjunctivitis sicca (dry eye syndrome)

Answer

Aqueous tear deficiency due to lacrimal gland dysfunction

Answer

Obstruction in tear drainage pathways

Answer

Corneal damage due to viral infection

Question 9

What is the primary causative agent of swimming pool conjunctivitis?

Accepted Answer

Adenovirus type 3

Answer

Chlamydia trachomatis

Answer

Adenovirus type 8

Answer

Gonococcus

Question 10

Iron deposition line at edge of pterygium on corneal epithelium is known as?

Accepted Answer

Stocker's line

Answer

KF Ring

Answer

Fleischer ring

Answer

Ferry's line

Diseases of the Conjunctiva — MCQs

Diseases of the Conjunctiva — MCQs

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