Diseases of the Conjunctiva Practice Questions

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: 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: Conjunctival staining is done by all except:

India ink. ***India ink*** - **India ink** is primarily used for staining capsules of microorganisms (e.g., *Cryptococcus neoformans*) in microbiology, not for ocular surface staining. - It is a **negative stain** that outlines the microbe rather than directly staining its parts. *Fluorescein* - **Fluorescein** is a common dye used to stain the **cornea** and **conjunctiva**, revealing abrasions, ulcers, and foreign bodies. - It highlights areas where epithelial cells are damaged, allowing it to penetrate into the bare stroma. *Rose Bengal* - **Rose Bengal** is used to stain **devitalized or degenerated epithelial cells** on the conjunctiva and cornea, particularly in dry eye syndrome. - It also stains **mucus filaments** and areas of tear film instability. *Lissamine* - **Lissamine green** is a vital dye similar to Rose Bengal, used to detect **devitalized conjunctival and corneal cells**. - It is often preferred over Rose Bengal because it causes less stinging and discomfort to the patient.

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: What is the most common problem following surgical treatment of pterygium?

Recurrence. ***Recurrence*** - **Pterygium recurrence** is the most frequent complication after surgical excision, with rates varying significantly based on the surgical technique used. - Factors like incomplete excision, younger age, and environmental exposures can increase the risk of the pterygium growing back. *Corneal ulceration* - **Corneal ulceration** is a serious but relatively rare complication of pterygium surgery, often associated with infection or improper wound healing. - While possible, it is not the most common problem observed post-operatively. *Astigmatism* - **Astigmatism** can be present before pterygium surgery due to the mass effect on the cornea or can be induced or altered by the surgery itself. - Although it can be a significant visual consequence, it is not the most common post-operative problem compared to recurrence. *Scleral scarring* - **Scleral scarring** can occur at the site of pterygium excision, especially if bare sclera techniques are used, or with extensive use of adjuncts like mitomycin C. - While it can be cosmetically unappealing or even sight-threatening in rare cases, it is less common than recurrence.

Q: What is the bacterial cause most commonly associated with hyperacute severe bacterial conjunctivitis?

Neisseria. ***Neisseria*** - **Neisseria gonorrhoeae** and **Neisseria meningitidis** are well-known causes of hyperacute bacterial conjunctivitis because of their rapid onset and severe inflammatory response. - This form of conjunctivitis is characterized by abundant, thick purulent discharge and can rapidly lead to vision-threatening complications if not treated promptly. *Staphylococcus* - **Staphylococcus aureus** is a common cause of acute bacterial conjunctivitis, but it typically presents with a less severe, non-hyperacute course. - While it can cause significant inflammation, it rarely leads to the fulminant, rapid progression seen with Neisseria infections. *Streptococcus* - **Streptococcus pneumoniae** and **Streptococcus pyogenes** can cause bacterial conjunctivitis, often characterized by red, watery eyes and purulent discharge. - However, their presentation is generally acute rather than hyperacute, with a slower onset and progression compared to Neisseria. *Haemophilus* - **Haemophilus influenzae** is a common cause of bacterial conjunctivitis, particularly in children, often associated with otitis media. - The conjunctivitis caused by Haemophilus is typically acute and self-limiting, not characterized as hyperacute or severely rapidly progressive.

Q: Which of the following statements about pterygium is false?

Arise from any part of conjunctiva. ***Arise from any part of conjunctiva*** **(FALSE - Correct Answer)** - This statement is **FALSE** and thus the correct answer. - Pterygium characteristically arises from the **nasal (interpalpebral) bulbar conjunctiva** in 90-95% of cases. - It does NOT arise from "any part" - it has a specific predilection for the medial (nasal) limbus in the palpebral fissure zone. - Temporal pterygium is much less common (~10% of cases). *Can cause astigmatism* **(TRUE)** - This statement is TRUE. - As a pterygium grows across the cornea, it can induce **corneal astigmatism** by altering the curvature of the cornea. - This irregular corneal surface can blur vision, especially as the pterygium progresses towards the central visual axis. *Surgery is treatment of choice* **(TRUE)** - This statement is TRUE. - **Surgical excision** is the primary treatment for pterygium when it is symptomatic, threatens vision, or causes significant cosmetic concerns. - Indications for surgery include: growth towards the visual axis, inducing high astigmatism, significant discomfort, or cosmetic desire. - Adjunctive measures (mitomycin C, conjunctival autograft) help reduce recurrence. *UV exposure is risk factor* **(TRUE)** - This statement is TRUE. - **Ultraviolet (UV) radiation exposure** is a well-established and significant risk factor for the development and progression of pterygium. - This explains its higher prevalence in individuals living in sunny climates (between 37° N and 37° S latitude - "pterygium belt") and those with outdoor occupations.

Q: Unilateral frontal blisters with upper lid edema and conjunctivitis is seen in?

Herpes Zoster Ophthalmicus. ***Herpes Zoster Ophthalmicus*** - This condition is characterized by a **unilateral vesicular rash** (blisters) in the **trigeminal dermatome (V1)**, which includes the forehead and upper eyelid, along with significant **lid edema** and **conjunctivitis**. - **Hutchinson's sign** (lesions on the tip, side, or root of the nose) indicates a high risk of ocular involvement due to the nasociliary nerve innervation. *Acanthamoeba Keratitis* - This is an **amoebic infection** of the cornea typically associated with **contact lens wear** and often presents with severe pain and a **ring infiltrate** in the cornea. - It does not typically present with unilateral frontal blisters or significant lid edema. *Herpes Simplex* - Herpes simplex typically causes **recurrent corneal ulcers** (dendritic or geographic) and sometimes blepharitis, but not the widespread **unilateral frontal blisters** seen in the trigeminal distribution. - While it can cause conjunctivitis and lid edema, the pattern of skin lesions is the key differentiator. *Neuroparalytic Keratitis* - This condition results from **trigeminal nerve damage**, leading to corneal anesthesia and subsequent **trophic corneal ulceration**. - It presents primarily with **corneal findings** (epithelial defects, ulcers) due to impaired sensation and tear film stability, not initial vesicular skin lesions or prominent lid edema.

Q: Cicatrising trachoma is associated with which stage of the disease?

Stage-3. ***Stage-3*** - **Cicatrising trachoma** corresponds to Stage 3 of the WHO classification for trachoma, characterized by scarring of the conjunctiva. - This stage is marked by the presence of **conjunctival scarring (TS)**, which can lead to further complications. *Stage-1* - Stage 1 is characterized by **trachomatous inflammation, follicular (TF)**, indicating active infection with follicles in the upper tarsal conjunctiva. - It represents the initial, active inflammatory phase and does not involve scarring. *Stage-2* - Stage 2 is characterized by **trachomatous inflammation, intense (TI)**, where there is pronounced inflammation that obscures blood vessels. - While intense inflammation is present, significant scarring has not yet developed at this stage, differentiating it from cicatrising trachoma. *Stage-4* - Stage 4 is characterized by **trachomatous trichiasis (TT)**, where the eyelashes turn inward and rub against the cornea. - This stage is a direct complication of the scarring from Stage 3, leading to corneal damage, rather than the cicatrising stage itself.

Question 1

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 2

Which medication is commonly used to treat bacterial conjunctivitis?

Accepted Answer

Moxifloxacin

Answer

Acyclovir

Answer

Prednisolone

Answer

Timolol

Question 3

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 4

Conjunctival staining is done by all except:

Accepted Answer

India ink

Answer

Rose Bengal

Answer

Lissamine

Answer

Fluorescein

Question 5

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 6

What is the most common problem following surgical treatment of pterygium?

Accepted Answer

Recurrence

Answer

Corneal ulceration

Answer

Astigmatism

Answer

Scleral scarring

Question 7

What is the bacterial cause most commonly associated with hyperacute severe bacterial conjunctivitis?

Accepted Answer

Neisseria

Answer

Staphylococcus

Answer

Streptococcus

Answer

Haemophilus

Question 8

Which of the following statements about pterygium is false?

Accepted Answer

Arise from any part of conjunctiva

Answer

Can cause astigmatism

Answer

Surgery is treatment of choice

Answer

UV exposure is risk factor

Question 9

Unilateral frontal blisters with upper lid edema and conjunctivitis is seen in?

Accepted Answer

Herpes Zoster Ophthalmicus

Answer

Herpes Simplex

Answer

Neuroparalytic Keratitis

Answer

Acanthamoeba Keratitis

Question 10

Cicatrising trachoma is associated with which stage of the disease?

Accepted Answer

Stage-3

Answer

Stage-1

Answer

Stage-2

Answer

Stage-4

Diseases of the Conjunctiva — MCQs

Diseases of the Conjunctiva — MCQs

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