Diseases of the Retina Practice Questions

Q: A 3-year-old child presented with leukocoria in the right eye since 2 months. On examination, a total retinal detachment was present in the same eye. Ultrasound B-scan revealed a heterogeneous subretinal mass with calcification associated with retinal detachment. What is the most likely clinical diagnosis?

Retinoblastoma. ***Retinoblastoma*** - The presence of **leukocoria**, a **heterogeneous subretinal mass with calcification**, and **total retinal detachment** in a 3-year-old child is highly characteristic of retinoblastoma. - **Calcification** within an intraocular mass in a child is almost pathognomonic for retinoblastoma. *Coats disease* - Characterized by **retinal telangiectasias** and massive subretinal exudation, leading to retinal detachment, but typically **no intraocular mass or calcification** is seen. - While it can cause leukocoria and retinal detachment, the absence of a distinct mass with calcification makes it less likely than retinoblastoma. *Toxocariasis (can cause mass-like lesions)* - Can cause **granulomatous inflammation** and sometimes a retinal mass (e.g., peripheral granuloma), but **calcification is rare**, and the mass is typically inflammatory. - Often associated with a history of **exposure to dogs or soil**, and presents with signs of inflammation like vitritis or uveitis. *Retinal tuberculoma (inflammatory lesion)* - A rare manifestation of tuberculosis, presenting as a **granulomatous mass**; however, it is typically an **inflammatory lesion without calcification**. - Less common in young children as a primary cause of leukocoria and usually associated with systemic tuberculosis.

Q: In diabetic retinopathy, which layer of the retina is primarily affected?

Inner nuclear layer. ***Inner nuclear layer*** - The inner nuclear layer contains the **retinal capillary network**, which is the primary site of pathology in diabetic retinopathy. - **Microangiopathy** (pericyte loss, basement membrane thickening, endothelial cell damage) occurs in the capillaries located within this layer. - **Microaneurysms**, the earliest ophthalmoscopic sign of diabetic retinopathy, form from damaged capillaries in the inner nuclear layer. - **Diabetic macular edema (DME)** involves fluid accumulation that begins at the level of the capillaries in the inner nuclear and inner plexiform layers, then extends to the outer plexiform layer. *Outer plexiform layer* - This layer is **secondarily affected** by leakage from damaged capillaries in deeper retinal layers (inner nuclear and inner plexiform layers). - **Hard exudates** (lipid and protein deposits) accumulate in the outer plexiform layer as a consequence of capillary leakage, but this is not the primary site of vascular pathology. - The outer plexiform layer itself has minimal vasculature and is not where the initial microvascular changes occur. *Layer of rods and cones* - Photoreceptors are affected only in advanced stages of diabetic retinopathy due to chronic ischemia and secondary damage. - The primary pathology is vascular and occurs in the inner retinal layers where capillaries are located, not in the avascular photoreceptor layer. *Retinal pigment epithelium* - The RPE is not directly affected by the microvascular changes that characterize diabetic retinopathy. - RPE dysfunction is more characteristic of **age-related macular degeneration (AMD)** and other degenerative conditions. - In diabetic retinopathy, the RPE may be affected indirectly in very advanced cases but is not a primary site of pathology.

Q: Which of the following conditions is associated with posterior staphyloma?

Pathological myopia. ***Pathological myopia*** - **Posterior staphyloma** is a characteristic feature of **pathological myopia**, also known as high or degenerative myopia. - It involves an **outpouching of the posterior sclera**, which can lead to significant vision loss due to associated retinal and choroidal degeneration. *Congenital myopia* - While present from birth, **congenital myopia** does not inherently imply the development of a posterior staphyloma. - It often refers to a myopia present at birth, which may or may not progress to the severe, degenerative form seen in pathological myopia. *Simple myopia* - **Simple myopia** is a common refractive error that typically does not involve degenerative changes such as posterior staphyloma. - It is characterized by an eyeball that is slightly too long, causing light to focus in front of the retina, but without structural abnormalities of the posterior pole. *Hypermetropia* - **Hypermetropia** (farsightedness) is the opposite of myopia, where the eye is too short or has insufficient focusing power. - It is not associated with posterior staphyloma; rather, the globe is typically smaller than average, and the risk of staphyloma is negligible.

Q: Pupil in an acute attack of anterior uveitis is

Constricted & sluggish reacting. ***Constricted & sluggish reacting*** - In **acute anterior uveitis**, the pupil is characteristically **constricted (miotic)** due to **ciliary muscle spasm** and **iris sphincter irritation**. - The key feature in the acute phase is that the pupil is **sluggish or poorly reactive to light** due to inflammatory involvement of the iris. - This combination of **miosis + sluggish reaction** is the hallmark of acute anterior uveitis. *Irregular & constricted* - While this describes a constricted pupil, **irregularity** develops **later** in the course of uveitis when **posterior synechiae** form (iris adhesions to the anterior lens capsule). - In the **acute phase**, the pupil is typically **regular** in shape, though constricted and sluggish. - This represents a complication rather than the initial acute presentation. *Large and fixed* - A **large (dilated) and fixed pupil** is the classic finding in **acute angle-closure glaucoma**, where high intraocular pressure causes **mid-dilated fixed pupil** due to iris sphincter ischemia. - This is the **opposite** of the miosis seen in acute anterior uveitis. *Semidilated* - A **semidilated pupil** may be seen in conditions like **Adie's tonic pupil**, **oculomotor nerve palsy**, or **pharmacological mydriasis**. - This is **not** characteristic of acute anterior uveitis, where pupillary constriction predominates.

Q: Which of the following statements about sympathetic ophthalmitis is false?

Pathological features are of non-granulomatous panuveitis. ***Pathological features are of non-granulomatous panuveitis*** - Sympathetic ophthalmia is characterized by a **granulomatous inflammation** of the uveal tract, making a non-granulomatous panuveitis feature incorrect. - The hallmark histological finding is a **diffuse granulomatous infiltrate** with epithelioid cells, lymphocytes, and sometimes multinucleated giant cells within the uvea, specifically sparing the choriocapillaris. *Clinically manifests as granulomatous iridocyclitis* - Sympathetic ophthalmia typically presents as a **granulomatous panuveitis**, affecting the iris, ciliary body, and choroid. - The clinical presentation varies but commonly includes signs of inflammation in both the anterior and posterior segments of the eye, often with **mutton-fat keratic precipitates** and granulomas. *The non-injured eye developing uveitis is called the sympathizing eye.* - In sympathetic ophthalmia, the term "**sympathizing eye**" refers to the uninjured eye which develops inflammation following trauma or surgery to the fellow "exciting" eye. - This condition is thought to be an **autoimmune reaction** triggered by exposure of uveal antigens to the immune system in the injured eye, leading to a delayed hypersensitivity response in both eyes. *It is a bilateral disease* - Sympathetic ophthalmia is inherently a **bilateral condition**, affecting both the eye that suffered the initial trauma or surgery (exciting eye) and the fellow, previously healthy eye (sympathizing eye). - While the inflammation might start in one eye, it eventually involves the other eye because it is an **immune-mediated systemic response** to uveal antigens.

Q: Exudative retinal detachment is seen in which of the following conditions?

Preeclampsia. ***Preeclampsia*** - **Exudative retinal detachment** in preeclampsia occurs due to **choroidal ischemia and infarction**, leading to accumulation of subretinal fluid. - This condition is caused by **vasospasm and endothelial dysfunction**, characteristic of severe preeclampsia, affecting the choroidal vasculature. *Severe myopia* - Severe myopia is a significant risk factor for **rhegmatogenous retinal detachment**, which involves a tear in the retina. - It does not primarily cause exudative detachment, which is characterized by fluid accumulation without a retinal tear. *Retinal degeneration* - Retinal degeneration, such as that seen in **retinitis pigmentosa**, can lead to progressive vision loss and may increase the risk of rhegmatogenous retinal detachment. - However, it is not a direct cause of exudative retinal detachment. *Penetrating injuries to the eye* - Penetrating eye injuries typically lead to **traumatic retinal detachment**, which can be rhegmatogenous or tractional, or a combination. - While inflammation and fluid can be present, the primary mechanism of detachment is not exudative due to systemic vascular dysfunction.

Q: Recurrent vitreous hemorrhage in an otherwise healthy young male is caused by:

Eales disease. ***Eales disease*** - This condition is characterized by **recurrent inflammation** and **vasculitis of the peripheral retinal vessels**, which often leads to neovascularization and subsequent vitreous hemorrhage in young, otherwise healthy individuals. - The disease typically affects young adults, particularly males, and is often bilateral, presenting with episodes of **decreased vision** due to vitreous bleeding. *Trauma* - While trauma can cause vitreous hemorrhage, the question specifies **recurrent** hemorrhage in an "otherwise healthy" individual, making it less likely to be the primary cause of repeated, spontaneous bleeds. - Unless there is a history of repeated injuries, trauma usually presents as an isolated event of hemorrhage. *Sickle cell retinopathy* - This condition is associated with **sickle cell disease**, which would make the individual not "otherwise healthy" and typically presents with other systemic symptoms of the disease. - While sickle cell retinopathy can cause vitreous hemorrhage due to **proliferative changes**, it's usually part of a broader systemic illness, which is contradicted by the prompt. *Retinal vein obstruction* - This condition often occurs in **older individuals** with systemic risk factors such as hypertension, diabetes, or glaucoma, making it less likely in an "otherwise healthy young male." - It usually presents with a single, acute event of hemorrhage with associated **retinal edema** and cotton wool spots, rather than recurrent episodes in the absence of predisposing factors.

Q: In the context of ophthalmology, the Amsler grid is primarily used for:

Identifying central vision defects. ***Identifying central vision defects*** - The Amsler grid is specifically designed to detect **distortions** or **scotomas** (blind spots) in the **central visual field**, which is crucial for tasks like reading and recognizing faces. - It is frequently used for monitoring conditions affecting the macula, such as **age-related macular degeneration (AMD)**, where patients might perceive straight lines as wavy or missing. *Evaluating optic disc morphology* - **Optic disc morphology** is typically assessed with an **ophthalmoscope** or by imaging techniques like **optical coherence tomography (OCT)**, which provide detailed views of the optic nerve head. - The Amsler grid does not provide direct visualization or measurement of the optic disc's structure. *Assessing eye alignment issues* - Eye alignment issues, such as **strabismus**, are evaluated using tests like the **cover-uncover test**, **Hirschberg test**, or prism cover test, which assess the position of the eyes relative to each other. - The Amsler grid focuses on the quality of central vision rather than the coordinated movement or alignment of the eyes. *Examining the complete retina* - A comprehensive examination of the retina, especially the periphery, requires a **dilated fundus examination** using an **ophthalmoscope** or specialized retinal imaging devices. - The Amsler grid only tests the central 10 to 20 degrees of the visual field, specifically the macula and paramacular region, not the entire retina.

Q: Which of the following is NOT a feature of iridocyclitis?

Mucopurulent discharge. ***Mucopurulent discharge*** * **Mucopurulent discharge** is a hallmark symptom of bacterial conjunctivitis, indicating an infection of the conjunctiva rather than the iris and ciliary body. * **Iridocyclitis** involves inflammation inside the eye, which does not typically produce external discharge. *Pain* * **Pain** is a common symptom of iridocyclitis, often described as a throbbing ache due to inflammation and ciliary body spasm. * The pain can worsen with eye movement or exposure to bright light (photophobia). *Constricted pupil* * A **constricted pupil** (miosis) is characteristic of acute iridocyclitis, caused by spasm of the pupillary sphincter muscle and inflammation. * This differentiates it from acute angle-closure glaucoma where the pupil may be mid-dilated. *Circum corneal congestion* * **Circumcorneal congestion**, also known as ciliary flush, is an important sign of iridocyclitis, appearing as a deep red or violet ring of injection around the cornea. * This type of redness indicates inflammation of the deeper structures of the eye, such as the iris and ciliary body.

Question 1

A 3-year-old child presented with leukocoria in the right eye since 2 months. On examination, a total retinal detachment was present in the same eye. Ultrasound B-scan revealed a heterogeneous subretinal mass with calcification associated with retinal detachment. What is the most likely clinical diagnosis?

Accepted Answer

Retinoblastoma

Answer

Coats disease

Answer

Toxocariasis

Answer

Retinal tuberculoma

Question 2

In diabetic retinopathy, which layer of the retina is primarily affected?

Accepted Answer

Inner nuclear layer

Answer

Layer of rods and cones

Answer

Retinal pigment epithelium

Answer

Outer plexiform layer

Question 3

Which of the following conditions is associated with posterior staphyloma?

Accepted Answer

Pathological myopia

Answer

Simple myopia

Answer

Hypermetropia

Answer

Congenital myopia

Question 4

Pupil in an acute attack of anterior uveitis is

Accepted Answer

Constricted & sluggish reacting

Answer

Irregular & constricted

Answer

Large and fixed

Answer

Semidilated

Question 5

Which of the following statements about sympathetic ophthalmitis is false?

Accepted Answer

Pathological features are of non-granulomatous panuveitis

Answer

Clinically manifests as granulomatous iridocyclitis

Answer

It is a bilateral disease

Answer

The non-injured eye developing uveitis is called the sympathizing eye

Question 6

Exudative retinal detachment is seen in which of the following conditions?

Accepted Answer

Preeclampsia

Answer

Penetrating injuries to the eye

Answer

Severe myopia

Answer

Retinal degeneration

Question 7

Recurrent vitreous hemorrhage in an otherwise healthy young male is caused by:

Accepted Answer

Eales disease

Answer

Sickle cell retinopathy

Answer

Trauma

Answer

Retinal vein obstruction

Question 8

What is a reverse hypopyon?

Accepted Answer

Collection of emulsified silicone oil in the anterior chamber

Answer

Collection of pus in the vitreous

Answer

Abscess in the orbit

Answer

Seen in corneal ulcer close to being ruptured

Question 9

In the context of ophthalmology, the Amsler grid is primarily used for:

Accepted Answer

Identifying central vision defects

Answer

Evaluating optic disc morphology

Answer

Assessing eye alignment issues

Answer

Examining the complete retina

Question 10

Which of the following is NOT a feature of iridocyclitis?

Accepted Answer

Mucopurulent discharge

Answer

Pain

Answer

Circum corneal congestion

Answer

Constricted pupil

Diseases of the Retina — MCQs

Diseases of the Retina — MCQs

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