Diseases of the Retina Practice Questions

Q: Snow banking is typically seen in which of the following conditions?

Pars planitis. **Explanation:** **Pars planitis** is a specific subset of intermediate uveitis characterized by idiopathic inflammation of the pars plana. The hallmark clinical sign is **"Snow banking,"** which refers to the accumulation of white, exudative inflammatory material (fibrovascular membranes) over the inferior pars plana and ora serrata. This is often accompanied by **"Snowballs,"** which are inflammatory cells clumped in the vitreous. **Analysis of Incorrect Options:** * **Endophthalmitis:** This is a severe intraocular inflammation (usually bacterial or fungal) involving the vitreous and aqueous humors. It presents with hypopyon, severe pain, and loss of vision, but not localized snow banking. * **Coats’ Disease:** An idiopathic condition characterized by telangiectatic retinal vessels and massive **subretinal exudation** (hard exudates), typically seen in young males. It does not involve pars plana inflammation. * **Eales’ Disease:** An idiopathic peripheral inflammatory venulitis (perivasculitis) characterized by peripheral retinal ischemia, neovascularization, and recurrent vitreous hemorrhages. **High-Yield Clinical Pearls for NEET-PG:** * **Most common complication:** Cystoid Macular Edema (CME) is the leading cause of vision loss in pars planitis. * **Demographics:** Typically affects children and young adults; often bilateral (80%). * **Clinical Sign:** Use indirect ophthalmoscopy with **scleral depression** to visualize snow banking in the extreme periphery. * **Association:** Intermediate uveitis can be associated with systemic conditions like Multiple Sclerosis (MS) and Sarcoidosis.

Q: On ophthalmoscopic examination, retinal hemorrhage surrounded by white woolly fibers is known as what?

Roth spots. **Explanation:** **Roth spots** are characterized by a central white or pale spot (composed of fibrin-platelet thrombi) surrounded by a halo of retinal hemorrhage. While classically associated with **Subacute Bacterial Endocarditis (SBE)**, they are not pathognomonic and can be seen in various systemic conditions such as leukemia, severe anemia, diabetes mellitus, and hypertensive retinopathy. The "white woolly" appearance mentioned in the question refers to the pale, fibrinous center of the hemorrhage. **Analysis of Incorrect Options:** * **Cotton wool spots:** These are yellowish-white, fluffy patches on the retina caused by localized ischemia in the nerve fiber layer (micro-infarcts). They do not typically feature a surrounding hemorrhage. * **Rose spots:** These are small, pink macules found on the chest or abdomen of patients with **Typhoid fever** (Enteric fever); they are a dermatological finding, not an ophthalmic one. * **Retinal hemorrhage:** This is a broad, non-specific term. While Roth spots are a type of retinal hemorrhage, the specific description of a white center makes "Roth spots" the most accurate clinical diagnosis. **High-Yield Clinical Pearls for NEET-PG:** * **Litten’s Sign:** Another name for Roth spots in the context of infective endocarditis. * **Pathophysiology:** The white center represents a **fibrin-platelet plug** at the site of vessel rupture (capillary blowout). * **Differential Diagnosis:** Remember the mnemonic **"STATE"** for Roth spots: **S**curvy, **T**rauma, **A**nemia, **T**hrombocytopenia/Leukemia, **E**ndocarditis.

Q: Rubeosis iridis is NOT COMMONLY seen in:

CRAO (Central Retinal Artery Occlusion). **Explanation:** The development of **Rubeosis Iridis** (neovascularization of the iris) is driven by chronic retinal ischemia, which triggers the release of **Vascular Endothelial Growth Factor (VEGF)**. This factor diffuses into the anterior segment, stimulating the growth of abnormal vessels on the iris. **Why CRAO is the correct answer:** In **Central Retinal Artery Occlusion (CRAO)**, the blood supply to the inner retina is completely cut off, leading to rapid cell death (infarction). Dead retinal tissue cannot produce VEGF. Therefore, while rubeosis can occur in rare cases (approx. 2-5%), it is **not commonly** seen compared to other ischemic conditions. **Analysis of other options:** * **CRVO (Central Retinal Vein Occlusion):** Specifically the **Ischemic type**, this is the most common cause of rubeosis iridis. It is famously associated with "100-day glaucoma" (Neovascular Glaucoma). * **Diabetic Retinopathy:** Proliferative Diabetic Retinopathy (PDR) is a leading cause of rubeosis due to widespread, chronic retinal capillary non-perfusion. * **Neovascularization:** This is a general term for the process itself. Rubeosis iridis *is* neovascularization of the iris; therefore, it is inherently associated with the process. **NEET-PG High-Yield Pearls:** 1. **Most common cause of Rubeosis Iridis:** Diabetic Retinopathy. 2. **Most common cause of Neovascular Glaucoma (NVG):** Ischemic CRVO. 3. **100-Day Glaucoma:** Refers to NVG occurring roughly 3 months after an ischemic CRVO event. 4. **CRAO Clinical Sign:** "Cherry red spot" at the macula due to the visible choroid through thin foveal tissue amidst surrounding retinal edema.

Q: Roth's spots are seen in which of the following conditions?

Bacterial Endocarditis. **Explanation:** **Roth’s spots** are classic retinal findings characterized by **hemorrhages with a pale, white, or fibrin center**. 1. **Why Bacterial Endocarditis is correct:** The underlying pathophysiology involves a **Type III hypersensitivity reaction** (immune-complex mediated vasculitis). In Subacute Bacterial Endocarditis (SBE), circulating immune complexes deposit in the retinal capillary walls, leading to rupture (hemorrhage) and subsequent focal ischemia or inflammatory infiltration at the center, which creates the characteristic "white spot." 2. **Why other options are incorrect:** * **Trauma:** While trauma can cause various retinal hemorrhages (e.g., Purtscher's retinopathy), it does not typically present with the specific white-centered Roth's spots unless associated with secondary complications. * **Coats Disease:** This is an idiopathic condition characterized by telangiectatic retinal vessels and massive **subretinal exudation** ("light bulb" appearance), not white-centered hemorrhages. * **Trachoma:** This is a chronic keratoconjunctivitis affecting the **external eye** (conjunctiva and cornea), leading to Arlt’s lines and Herbert’s pits; it does not involve the retina. **High-Yield Clinical Pearls for NEET-PG:** * **Differential Diagnosis of Roth’s Spots:** Beyond Endocarditis, remember the mnemonic **"LIME"**: **L**eukemia (most common cause), **I**llness (Anemia), **M**ellitus (Diabetes), and **E**ndocarditis. * **Composition:** The white center is typically composed of **fibrin-platelet aggregates**, though in leukemia, it may consist of malignant white blood cells. * **Other Retinal Spots:** Do not confuse Roth’s spots with **Elschnig spots** (hypertensive choroidopathy) or **Cotton wool spots** (nerve fiber layer infarcts).

Q: Cotton wool spots in diabetic retinopathy are due to:

Retinal nerve fiber layer infarcts. **Explanation:** **Cotton wool spots (CWS)**, also known as soft exudates, are a hallmark clinical finding in Pre-proliferative Diabetic Retinopathy (PPDR). 1. **Why Option A is Correct:** Cotton wool spots are not true exudates. They represent **focal infarcts of the Retinal Nerve Fiber Layer (RNFL)**. When retinal precapillary arterioles become occluded due to microangiopathy, axoplasmic flow within the nerve fibers is interrupted. This leads to the accumulation of transported intracellular material (organelles and proteins) at the edge of the infarct, creating the clinical appearance of "fluffy" white patches with indistinct margins. 2. **Why Other Options are Incorrect:** * **B. Retinal holes:** These are full-thickness breaks in the neurosensory retina, typically associated with retinal detachment or high myopia, not focal ischemia. * **C. Retinal haemorrhage:** In diabetes, these appear as "dot and blot" hemorrhages (inner nuclear layer) or "flame-shaped" hemorrhages (RNFL), representing vascular leakage or rupture, not ischemia. * **D. Macular degeneration:** This involves progressive atrophy or neovascularization of the photoreceptors and RPE, primarily in the elderly (AMD), and is pathophysiologically distinct from RNFL infarction. **High-Yield Clinical Pearls for NEET-PG:** * **Histology:** On light microscopy, CWS show **Cytoid bodies** (swollen axonal ends containing eosinophilic material). * **Significance:** The presence of CWS is a sign of **retinal ischemia**. In the "4-2-1 rule" for Severe NPDR, CWS are a key marker. * **Differential Diagnosis:** CWS are also seen in Hypertension, HIV retinopathy, Anemia, and Systemic Lupus Erythematosus (SLE).

Q: What is true about Birdshot Chorioretinopathy?

Bilateral presentation. **Explanation:** **Birdshot Chorioretinopathy (BSCR)** is a rare, chronic, and potentially blinding form of posterior uveitis. 1. **Why Option B is Correct:** Birdshot Chorioretinopathy is characteristically a **bilateral**, symmetrical disease. It is an autoimmune inflammatory condition where the body attacks the choroid and retina. The hallmark clinical finding is the presence of multiple, cream-colored, oval "birdshot" spots (hypopigmented lesions) scattered throughout the fundus, typically starting around the optic disc and radiating towards the periphery. 2. **Why Other Options are Incorrect:** * **Option A:** It is almost never unilateral; bilateral involvement is a diagnostic requirement. * **Option C:** The onset is typically **chronic and insidious**. Patients often present with gradual blurring of vision, floaters, and night blindness (nyctalopia) rather than an acute crisis. * **Option D:** There is a slight **female predilection**, and it most commonly affects Caucasian individuals in their 5th to 6th decades of life. **High-Yield Clinical Pearls for NEET-PG:** * **HLA Association:** This is the strongest known HLA-disease association in ophthalmology. Over 95% of patients are **HLA-A29 positive**. * **Fundus Fluorescein Angiography (FFA):** Often shows retinal vasculitis and cystoid macular edema (CME), which is the most common cause of vision loss. * **Indocyanine Green (ICG) Angiography:** Superior to FFA for visualizing the "birdshot" lesions, which appear as hypofluorescent spots. * **Treatment:** Requires long-term systemic immunosuppression (e.g., Corticosteroids, Cyclosporine) to prevent progressive retinal atrophy.

Q: Snow banking is typically seen in which of the following conditions?

Pars planitis. **Explanation:** **Pars planitis** is a specific subset of intermediate uveitis characterized by idiopathic inflammation of the *pars plana* (the posterior part of the ciliary body). The hallmark clinical sign of this condition is **"Snow banking,"** which refers to the accumulation of white, exudative inflammatory material (fibroglial masses) over the inferior pars plana and ora serrata. This is often accompanied by **"Snowballs,"** which are inflammatory cells clumped in the vitreous. **Analysis of Options:** * **Endophthalmitis:** This is a severe intraocular inflammation (usually bacterial or fungal) involving the vitreous and aqueous humors. It presents with hypopyon, severe pain, and vision loss, but not localized snow banking. * **Coat’s Disease:** An idiopathic condition characterized by telangiectatic retinal vessels and massive **subretinal exudation** (hard exudates), typically seen in young males. It does not involve pars plana exudates. * **Eale’s Disease:** An idiopathic peripheral inflammatory venulitis (perivasculitis) that leads to peripheral non-perfusion, neovascularization, and recurrent **vitreous hemorrhage**. It is not associated with snow banking. **High-Yield Clinical Pearls for NEET-PG:** * **Most common complication:** Cystoid Macular Edema (CME) is the leading cause of vision loss in Pars planitis. * **Demographics:** Typically affects children and young adults; often bilateral (80%). * **Associations:** While idiopathic by definition, intermediate uveitis can be associated with **Multiple Sclerosis** and **Sarcoidosis**. * **Treatment:** Steroids (Periocular/Systemic) are the first line; Cryotherapy or Laser photocoagulation is used for the snow bank area if complications arise.

Q: Hyaluronic acid, a mucopolysaccharide, is primarily present in which part of the eye?

Vitreous Humor. **Explanation:** The **Vitreous Humor** is a transparent, gel-like substance that fills the posterior segment of the eye. It is composed of approximately 98–99% water, with the remaining framework consisting of a network of **Type II collagen fibrils** and the glycosaminoglycan **Hyaluronic Acid (HA)**. Hyaluronic acid is a long-chain polysaccharide that provides the vitreous with its characteristic viscoelasticity and high water-binding capacity, maintaining intraocular volume and retinal apposition. **Analysis of Options:** * **Aqueous Humor:** Primarily consists of water, electrolytes, and low concentrations of proteins. While it contains trace amounts of hyaluronic acid, it is not the primary site of its concentration or structural function. * **Lens:** Composed mainly of specialized proteins called **crystallins**. It does not contain significant amounts of mucopolysaccharides like hyaluronic acid. * **Cornea:** The corneal stroma is rich in collagen (Type I) and proteoglycans (like keratan sulfate and dermatan sulfate), but hyaluronic acid is not its primary constituent. **High-Yield Clinical Pearls for NEET-PG:** * **Vitreous Aging:** With age, the vitreous undergoes **syneresis** (liquefaction). This occurs as hyaluronic acid molecules release their bound water, leading to the collapse of the collagen framework and potentially causing **Posterior Vitreous Detachment (PVD)**. * **Asteroid Hyalosis:** Characterized by the accumulation of **calcium soaps** within the vitreous framework. * **Synchysis Scintillans:** Characterized by **cholesterol crystals** in a liquefied vitreous (usually post-traumatic or post-inflammatory). * **Volume:** The vitreous volume is approximately **4 ml**, making up about 80% of the globe's volume.

Q: Retinitis pigmentosa is associated with which of the following conditions, except?

Hallervorden-Spatz disease. **Explanation:** Retinitis Pigmentosa (RP) is a genetically heterogeneous group of rod-cone dystrophies. While most cases are isolated, approximately 25% are associated with systemic syndromes. **Why Hallervorden-Spatz disease is the correct answer:** Hallervorden-Spatz disease (now known as **Pantothenate Kinase-Associated Neurodegeneration or PKAN**) is a neurodegenerative disorder characterized by iron accumulation in the basal ganglia. Its hallmark ocular finding is **"Bull’s eye maculopathy"** rather than the typical pigmentary retinopathy (bone spicules) seen in Retinitis Pigmentosa. **Analysis of Incorrect Options:** * **Refsum’s Disease:** A metabolic disorder of phytanic acid alpha-oxidation. It presents with the classic pentad: RP, peripheral neuropathy, cerebellar ataxia, nerve deafness, and ichthyosis. It is a high-yield "treatable" cause of RP via dietary restriction. * **NARP Syndrome:** Stands for **N**eurogenic muscle weakness, **A**taxia, and **R**etinitis **P**igmentosa. It is a mitochondrial DNA disorder. * **Abetalipoproteinemia (Bassen-Kornzweig Syndrome):** Characterized by fat malabsorption, acanthocytosis, and RP. It is another treatable cause of RP (high-dose Vitamin A and E supplementation). **High-Yield Clinical Pearls for NEET-PG:** 1. **Usher Syndrome:** The most common systemic association of RP (RP + Sensorineural hearing loss). 2. **Bardet-Biedl Syndrome:** RP + Polydactyly + Obesity + Hypogonadism + Renal anomalies. 3. **Kearns-Sayre Syndrome:** RP + Chronic Progressive External Ophthalmoplegia (CPEO) + Heart block. 4. **Fundus Findings in RP:** Arteriolar attenuation, Bone-spicule pigmentation, and Waxy pallor of the optic disc. 5. **Earliest Symptom:** Nyctalopia (Night blindness); **Earliest Sign:** Ring scotoma on perimetry.

Q: Shifting fluid is pathognomonic of which condition?

Solid retinal detachment. **Explanation:** **Shifting fluid** is a hallmark clinical sign of **Exudative (Serous) Retinal Detachment**, which is frequently caused by a **Solid Retinal Detachment** (e.g., secondary to an intraocular tumor like Choroidal Melanoma). ### Why Solid Retinal Detachment is Correct: In exudative detachment, fluid accumulates in the subretinal space due to damage to the blood-retinal barrier or secretion from a tumor. Since there is no physical break (hole) or traction holding the retina, the subretinal fluid is free to move under the influence of gravity. When the patient changes position, the fluid shifts to the most dependent part of the eye, causing the detachment to "shift" location. This is pathognomonic for exudative/solid etiologies. ### Why Other Options are Incorrect: * **Rhegmatogenous RD:** Caused by a break/hole in the retina. The fluid is usually relatively static or moves very slowly; it does not demonstrate the rapid gravitational shifting seen in exudative cases. * **Tractional RD:** Caused by fibrovascular membranes (e.g., Diabetic Retinopathy) pulling the retina. The detachment is concave, fixed, and does not shift with position. * **Choroidal Detachment:** This involves fluid in the suprachoroidal space (between the choroid and sclera). It presents as a smooth, brown, lobulated elevation, but "shifting fluid" is specifically a descriptor for subretinal fluid in RD. ### NEET-PG High-Yield Pearls: * **Exudative RD:** Characterized by shifting fluid and a smooth, convex surface without a retinal break. * **Rhegmatogenous RD:** Most common type; characterized by a retinal break, "tobacco dust" (Shafer’s sign) in the vitreous, and a corrugated appearance. * **Tractional RD:** Most common cause is Proliferative Diabetic Retinopathy (PDR); it is the only RD that is **concave** in configuration.

Question 1

Snow banking is typically seen in which of the following conditions?

Accepted Answer

Pars planitis

Answer

Endophthalmitis

Answer

Coat's disease

Answer

Eales' disease

Question 2

On ophthalmoscopic examination, retinal hemorrhage surrounded by white woolly fibers is known as what?

Accepted Answer

Roth spots

Answer

Cotton wool spots

Answer

Rose spots

Answer

Retinal hemorrhage

Question 3

Rubeosis iridis is NOT COMMONLY seen in:

Accepted Answer

CRAO (Central Retinal Artery Occlusion)

Answer

CRVO (Central Retinal Vein Occlusion)

Answer

Diabetic retinopathy

Answer

Neovascularization

Question 4

Roth's spots are seen in which of the following conditions?

Accepted Answer

Bacterial Endocarditis

Answer

Trauma

Answer

Coats disease

Answer

Trachoma

Question 5

Cotton wool spots in diabetic retinopathy are due to:

Accepted Answer

Retinal nerve fiber layer infarcts

Answer

Retinal holes

Answer

Retinal haemorrhage

Answer

Macular degeneration

Question 6

What is true about Birdshot Chorioretinopathy?

Accepted Answer

Bilateral presentation

Answer

Unilateral presentation

Answer

Acute onset

Answer

Most commonly seen in males

Question 7

Snow banking is typically seen in which of the following conditions?

Accepted Answer

Pars planitis

Answer

Endophthalmitis

Answer

Coat's disease

Answer

Eale's disease

Question 8

Hyaluronic acid, a mucopolysaccharide, is primarily present in which part of the eye?

Accepted Answer

Vitreous Humor

Answer

Aqueous Humor

Answer

Lens

Answer

Cornea

Question 9

Retinitis pigmentosa is associated with which of the following conditions, except?

Accepted Answer

Hallervorden-Spatz disease

Answer

Refsum's disease

Answer

NARP syndrome

Answer

Abetalipoproteinemia

Question 10

Shifting fluid is pathognomonic of which condition?

Accepted Answer

Solid retinal detachment

Answer

Rhegmatogenous retinal detachment

Answer

Tractional retinal detachment

Answer

Choroidal detachment

Diseases of the Retina — MCQs

Diseases of the Retina — MCQs

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