Diseases of the Retina — MCQs
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Which of the following findings is indicative of active anterior uveitis?
Coloboma, most common site?
What does extraretinal fibrovascular proliferation at the ridge indicate?
The 'headlight in fog' appearance is seen in which condition?
What is the most common cause of vitreous hemorrhage in diabetic retinopathy?
Toxoplasma in children causes:
What is the first clinical sign observed in a patient with anterior uveitis?
What is the primary complication associated with Eale's disease?
What is the most common cause of anterior uveitis?
What type of deposit is commonly associated with age-related macular degeneration?
Diseases of the Retina Indian Medical PG Practice Questions and MCQs
Question 571: Which of the following findings is indicative of active anterior uveitis?
- A. Cells in anterior chamber (Correct Answer)
- B. Circumcorneal congestion
- C. Keratic precipitate
- D. Corneal edema
Explanation: ***Cells in anterior chamber*** - The presence of **inflammatory cells** (leukocytes) in the anterior chamber, visualized on slit-lamp examination with focused beam, is the **primary and most definitive indicator** of active anterior uveitis. - These cells result from breakdown of the **blood-aqueous barrier**, allowing inflammatory cells to enter the aqueous humor. - **Grading of cells** (0 to 4+) helps assess severity and monitor treatment response, making this the gold standard for diagnosing active inflammation. *Keratic precipitate* - **Keratic precipitates (KPs)** are deposits of inflammatory cells on the corneal endothelium (posterior corneal surface). - **Fresh KPs** can indicate active inflammation, but they represent a secondary finding—cells that have adhered to the endothelium. - **Old or pigmented KPs** indicate past inflammation rather than current activity. - The presence of **free-floating cells in the anterior chamber** is a more direct and reliable indicator of active disease than KPs. *Circumcorneal congestion* - **Ciliary flush** (circumcorneal congestion) indicates ocular inflammation but is **non-specific**. - It can be seen in various conditions including **acute angle-closure glaucoma**, **keratitis**, **scleritis**, and **iridocyclitis**. - While supportive of the diagnosis, it does not confirm active cellular inflammation. *Corneal edema* - **Corneal edema** typically results from elevated **intraocular pressure** or endothelial dysfunction. - While it can be a complication of severe or chronic uveitis (especially with secondary glaucoma), it is **not a direct indicator** of active anterior chamber inflammation. - It represents a secondary effect rather than a primary inflammatory sign.
Question 572: Coloboma, most common site?
- A. Superotemporal
- B. Inferonasal (Correct Answer)
- C. Inferotemporal
- D. Superonasal
Explanation: ***Inferonasal*** - This is the **most common site** for coloboma because it corresponds to the location of the **fetal optic fissure** (choroidal fissure) during development. - Coloboma results from the **incomplete closure** of the fetal optic fissure, which normally occurs around the fifth to seventh week of gestation. *Superotemporal* - While coloboma can occur in various locations, the **superotemporal quadrant** is not the typical site. - Colobomas are usually found in areas consistent with the path of the optic fissure. *Inferotemporal* - This location is less common for colobomas compared to the inferonasal region. - The inferotemporal region does not align with the usual embryological fusion line of the optic fissure. *Superonasal* - Colobomas in the **superonasal quadrant** are rare. - This area is typically unaffected because it is not part of the fetal optic fissure's normal closure pathway.
Question 573: What does extraretinal fibrovascular proliferation at the ridge indicate?
- A. Normal retina
- B. Stage II Retinopathy of Prematurity
- C. Stage III Retinopathy of Prematurity (Correct Answer)
- D. Stage I Retinopathy of Prematurity
Explanation: ***Stage III Retinopathy of Prematurity*** - Extraretinal fibrovascular proliferation at the ridge is the defining characteristic of **Stage III Retinopathy of Prematurity (ROP)**. - This stage signifies significant **neovascularization** extending into the vitreous, increasing the risk of **retinal detachment**. *Normal retina* - A normal retina does not exhibit **fibrovascular proliferation** or a distinct ridge, as its vascularization is fully developed and confined to the retinal plane. - Absence of any abnormal vascular growth or demarcation line indicates a healthy, mature retinal structure. *Stage II Retinopathy of Prematurity* - Stage II ROP is characterized by a **ridge** that is elevated and appears three-dimensional, but it **lacks extraretinal fibrovascular proliferation**. - This stage represents progression from Stage I, where the demarcation line becomes a prominent ridge, but without new vessel formation outside the retina. *Stage I Retinopathy of Prematurity* - Stage I ROP is characterized by a thin, flat **demarcation line** distinguishing vascularized from avascular retina, without any significant elevation or fibrovascular proliferation. - This initial stage indicates an arrested phase of retinal vascular development, but without the more severe signs of neovascularization.
Question 574: The 'headlight in fog' appearance is seen in which condition?
- A. Syphilis
- B. Toxocara
- C. Herpes
- D. Toxoplasmosis (Correct Answer)
Explanation: ***Toxoplasmosis*** - The "headlight in fog" appearance is a classic description of **chorioretinitis** caused by **congenital toxoplasmosis**. - It refers to an old, healed **retinal scar** (headlight) surrounded by active inflammation and **vitreous haze** (fog). *Syphilis* - Ocular syphilis can cause various presentations, including uveitis, retinitis, and optic neuropathy, but it does **not typically** present with the specific "headlight in fog" appearance. - Ocular lesions are often more diffuse or involve distinct **gummatous lesions**. *Toxocara* - Ocular toxocariasis often presents as a **granuloma** (either peripheral or macular) or as **endophthalmitis**, but not the characteristic "headlight in fog" pattern. - The lesions are usually a result of a direct larval migration and subsequent inflammatory reaction. *Herpes* - Herpes simplex virus (HSV) or varicella-zoster virus (VZV) can cause **acute retinal necrosis** (ARN) or progressive outer retinal necrosis (PORN), presenting with widespread retinal whitening and vascular occlusion. - These conditions have distinct appearances, generally **lacking the central scar** with surrounding active inflammation seen in "headlight in fog."
Question 575: What is the most common cause of vitreous hemorrhage in diabetic retinopathy?
- A. Non-proliferative diabetic retinopathy
- B. Proliferative diabetic retinopathy (Correct Answer)
- C. Severe non-proliferative diabetic retinopathy
- D. Diabetic macular edema
Explanation: ***Proliferative diabetic retinopathy*** - **Neovascularization** is the hallmark of proliferative diabetic retinopathy (PDR), where new, fragile blood vessels grow on the surface of the retina and optic disc. - These delicate vessels can easily rupture and bleed into the vitreous humor, leading to a **vitreous hemorrhage**. *Non-proliferative diabetic retinopathy* - This stage is characterized by **microaneurysms**, hemorrhages, and cotton wool spots, but typically lacks significant neovascularization. - While it involves retinal vascular damage, the absence of **newly formed, fragile vessels** makes vitreous hemorrhage less common. *Severe non-proliferative diabetic retinopathy* - This stage shows extensive microvascular abnormalities, including numerous hemorrhages and venular beading, but generally **still no new vessel formation**. - Without the presence of **fragile neovascular membranes**, the risk of significant vitreous hemorrhage is lower compared to PDR. *Diabetic macular edema* - This condition involves **fluid leakage** from damaged retinal vessels into the macula, causing vision loss. - While it's a common complication of diabetes, it primarily causes **macular swelling** and does not directly lead to vitreous hemorrhage.
Question 576: Toxoplasma in children causes:
- A. Chorioretinitis (Correct Answer)
- B. Keratitis
- C. Papillitis
- D. Conjunctivitis
Explanation: ***Chorioretinitis*** - **Toxoplasmosis** is a significant cause of **chorioretinitis** in children, particularly congenital infections. - Ocular toxoplasmosis often presents with **retinal lesions** that can lead to vision loss. *Conjunctivitis* - **Conjunctivitis** is an inflammation of the conjunctiva, typically caused by bacterial or viral infections. - While it can occur in children, it is not a primary or characteristic manifestation of **Toxoplasma infection**. *Keratitis* - **Keratitis** is an inflammation of the cornea, often caused by bacterial, viral, or fungal infections, or sometimes trauma. - Although eyes are affected by **Toxoplasma**, **keratitis** is not the typical ophthalmic presentation; **chorioretinitis** is. *Papillitis* - **Papillitis** refers to inflammation of the optic disc (optic nerve head). - While **Toxoplasma** can rarely affect the optic nerve, **papillitis** is not the most common or specific ocular manifestation compared to **chorioretinitis**.
Question 577: What is the first clinical sign observed in a patient with anterior uveitis?
- A. Presence of aqueous flare (Correct Answer)
- B. Presence of hypopyon
- C. Presence of miosis
- D. Presence of keratic precipitates
Explanation: ***Presence of aqueous flare*** - **Aqueous flare** is considered the **earliest clinical sign** of anterior uveitis, representing increased protein content in the anterior chamber due to breakdown of the **blood-aqueous barrier**. - It is detected as a visible "haze" when a **slit lamp beam** passes through the anterior chamber, similar to observing dust particles in a light beam. *Presence of hypopyon* - **Hypopyon** is a more severe sign, indicating a **layer of white blood cells** in the anterior chamber, representing a more advanced inflammatory process. - While it can occur in severe anterior uveitis, it is not typically the **first or earliest** clinical manifestation. *Presence of miosis* - **Miosis** (pupillary constriction) can be present in anterior uveitis due to **iris inflammation** and irritation of the sphincter muscle. - However, it is an indirect sign and typically occurs *after* the initial signs of inflammation in the aqueous humor, such as flare. *Presence of keratic precipitates* - **Keratic precipitates (KPs)** are deposits of inflammatory cells on the **endothelium of the cornea**. - These deposits are a result of sustained inflammation and typically appear *after* the initial inflammatory changes in the aqueous humor, such as flare, have already occurred.
Question 578: What is the primary complication associated with Eale's disease?
- A. Retinal hemorrhage
- B. Vitreous hemorrhage (Correct Answer)
- C. Conjunctival hemorrhage
- D. Choroidal hemorrhage
Explanation: ***Vitreous hemorrhage*** - **Vitreous hemorrhage** is a common and often visually debilitating complication of Eale's disease, resulting from the rupture of fragile new vessels. - The proliferative stage of Eale's disease involves the development of **neovascularization** on the retina, which can bleed into the vitreous humor. *Retinal hemorrhage* - While **retinal hemorrhages** can occur in Eale's disease, they are often precursors to or components of vitreous hemorrhage, not the primary, most significant complication. - Retinal hemorrhages alone may cause less severe vision loss compared to the extensive obscuration by vitreous bleeding. *Conjunctival hemorrhage* - **Conjunctival hemorrhage** involves bleeding in the superficial layers of the eye and is not typically associated with the underlying vasculitis of Eale's disease. - This is a benign condition and not a primary complication of a retinal vascular disorder. *Choroidal hemorrhage* - **Choroidal hemorrhage** occurs beneath the retina and is usually associated with trauma, surgery, or degenerative conditions like age-related macular degeneration, not Eale's disease. - Eale's disease primarily affects the **retinal vasculature**, leading to bleeding internally into the vitreous.
Question 579: What is the most common cause of anterior uveitis?
- A. CMV
- B. Toxoplasma
- C. Idiopathic (Correct Answer)
- D. Ankylosing spondylitis
Explanation: ***Idiopathic*** - In a significant proportion of cases of **anterior uveitis**, a specific cause cannot be identified, leading to a diagnosis of idiopathic uveitis. - This highlights the multifactorial nature of the condition, where various triggers or underlying predispositions may not always be evident. *CMV* - **Cytomegalovirus (CMV)** typically causes a **posterior uveitis** or **retinitis**, especially in immunocompromised individuals. - While CMV can rarely cause anterior uveitis, it is not the most common cause. *Toxoplasma* - **Toxoplasmosis** is a frequent cause of **posterior uveitis** or **chorioretinitis**, characterized by focal necrotic lesions in the retina. - It is not a common cause of isolated anterior uveitis, although anterior chamber inflammation can occur secondary to posterior disease. *Ankylosing spondylitis* - **Ankylosing spondylitis** is a well-known systemic condition associated with **acute anterior uveitis**. - However, while a significant association exists, it is not the single most common cause when considering all cases of anterior uveitis, many of which remain idiopathic.
Question 580: What type of deposit is commonly associated with age-related macular degeneration?
- A. Iron
- B. Drusen (Correct Answer)
- C. Lipochrome
- D. Hemosiderine
Explanation: ***Drusen*** - **Drusen** are yellow deposits of extracellular material that accumulate beneath the **retinal pigment epithelium (RPE)**. - Their presence is a hallmark sign of **age-related macular degeneration (AMD)** and can lead to vision loss by disrupting retinal function. *Iron* - While iron can accumulate in ocular tissues in conditions like **siderosis bulbi** (due to retained intraocular foreign bodies), it is not a characteristic deposit of macular degeneration. - Ocular iron deposition typically causes different pathologies, such as retinal dysfunction or glaucoma, rather than AMD. *Lipochrome* - **Lipochrome** refers to a class of pigments, including **lipofuscin**, which can accumulate in cells as a byproduct of cellular metabolism and aging. - Although lipofuscin buildup occurs in the RPE with age, **drusen** are the specific, organized extracellular deposits pathognomonic for macular degeneration. *Hemosiderine* - **Hemosiderin** is an iron-storage complex formed from the breakdown of hemoglobin, found in situations of hemorrhage or chronic bleeding. - It is not a typical deposit found in macular degeneration; its presence in the retina usually indicates a history of retinal hemorrhage.
Practice by Chapter
Retinal Anatomy and Physiology
Practice Questions
Age-Related Macular Degeneration
Practice Questions
Diabetic Retinopathy
Practice Questions
Retinal Vascular Diseases
Practice Questions
Retinal Detachment
Practice Questions
Hereditary Retinal Dystrophies
Practice Questions
Inflammatory Retinal Diseases
Practice Questions
Retinal Tumors
Practice Questions
Retinopathy of Prematurity
Practice Questions
Retinal Imaging Techniques
Practice Questions
Intravitreal Pharmacotherapy
Practice Questions
Vitreoretinal Surgery
Practice Questions
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