Diseases of the Retina Practice Questions

Q: Which fundoscopic finding is characterized by a retinal hemorrhage with a white center?

Roth spot. **Explanation:** **Roth spots** are characterized by retinal hemorrhages with a central white or pale spot. Pathophysiologically, the white center represents a **fibrin-platelet thrombus** at the site of vessel rupture, surrounded by a flame-shaped hemorrhage in the nerve fiber layer. While classically associated with **Subacute Bacterial Endocarditis (SBE)**, they are not pathognomonic and can be seen in leukemia, severe anemia, diabetes, and hypertensive retinopathy. **Analysis of Incorrect Options:** * **A. Cotton wool spots:** These are yellowish-white, "fluffy" lesions caused by micro-infarctions of the retinal nerve fiber layer (axoplasmic stasis). They do not contain blood/hemorrhage. * **B. Flame-shaped hemorrhage:** These are linear, splinter-like hemorrhages located in the superficial nerve fiber layer. While they form the "red" part of a Roth spot, they lack the characteristic white center. * **C. Drusen:** These are small, yellow deposits of extracellular debris (lipofuscin) located between the retinal pigment epithelium (RPE) and Bruch’s membrane. They are hallmark features of Age-related Macular Degeneration (AMD) and are not hemorrhagic. **High-Yield Clinical Pearls for NEET-PG:** * **Roth Spot Mnemonic:** "Roth" = **R**ed **O**utside, **T**hrombus **H**ere (center). * **Most common cause:** Though SBE is the classic exam answer, **Leukemia** is a very frequent cause in clinical practice. * **Location:** Roth spots are typically found in the superficial retina (nerve fiber layer), which gives the hemorrhage its feathered or flame-shaped border.

Q: Spontaneous regression of proliferative retinopathy may occur in which of the following conditions?

All of the above. **Explanation:** The hallmark of proliferative retinopathy is **neovascularization** (the growth of new, fragile blood vessels) in response to retinal ischemia and the release of vascular endothelial growth factor (VEGF). While these conditions often require treatment (like laser photocoagulation or anti-VEGF injections), spontaneous regression is a documented clinical phenomenon in specific scenarios. 1. **Diabetic Retinopathy (DR):** Although rare, spontaneous regression of neovascularization can occur, particularly if there is a significant improvement in systemic glycemic control or if the eye develops a complete posterior vitreous detachment (PVD), which removes the scaffold for vessel growth. 2. **Proliferative Sickle Retinopathy (PSR):** This condition is uniquely known for "autoinfarction" of the peripheral neovascular "sea-fan" lesions. The sickled erythrocytes can cause a localized blockage of the very vessels they helped create, leading to spontaneous regression. 3. **Retinopathy of Prematurity (ROP):** This is the most common condition among the three to undergo spontaneous regression. Approximately 85–90% of infants with early-stage ROP (Stage 1 or 2) experience spontaneous involution without any medical intervention as the peripheral retina vascularizes normally. **Clinical Pearls for NEET-PG:** * **PSR:** Most common in **HbSC** and **HbSThal** genotypes rather than HbSS (Sickle Cell Anemia). * **ROP:** The "vanguard" and "rear guard" are classic terms associated with the mesenchymal shunt in ROP. * **High-Yield Fact:** While regression occurs, it may leave behind "ghost vessels" or peripheral retinal thinning, which still requires long-term monitoring for retinal tears or detachment.

Q: What causes a cherry red spot?

Berlin's edema. **Explanation:** A **Cherry Red Spot** is a clinical sign where the fovea appears bright red against a pale, edematous background. This occurs because the foveola is the thinnest part of the retina, lacking the ganglion cell layer. When the surrounding retina becomes opaque due to edema or storage material, the underlying vascular choroid shines through the foveola, creating the "red spot" appearance. **Why Berlin’s Edema is correct:** Berlin’s Edema (Commotio Retinae) occurs following blunt trauma to the eye. The trauma causes extracellular edema and disruption of the outer retinal layers (photoreceptors and RPE). This opacification of the surrounding retina makes the normal choroidal vasculature at the fovea stand out as a cherry red spot. **Why the other options are incorrect:** * **Central Retinal Vein Occlusion (CRVO):** This is characterized by a "Blood and Thunder" appearance (extensive flame-shaped hemorrhages, dilated tortuous veins, and disc edema). It does **not** cause a cherry red spot. * **Eales Disease:** This is an idiopathic peripheral perivasculitis (inflammation of vessel walls) leading to peripheral non-perfusion and vitreous hemorrhage. It does not typically involve the macula in a way that produces a cherry red spot. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause:** Central Retinal Artery Occlusion (CRAO). * **Metabolic causes:** Tay-Sachs disease (most common lysosomal storage disorder), Niemann-Pick disease, and Gaucher’s disease. * **Traumatic cause:** Berlin’s Edema. * **Drug-induced:** Quinine toxicity. * **Mnemonic (OCHRE):** **O**clusion (CRAO), **C**herry red spot (Tay-Sachs), **H**urler’s, **R**etinal trauma (Berlin's), **E**dema.

Q: Synchysis refers to:

Liquefaction of the vitreous. **Explanation:** **1. Why Option A is Correct:** **Synchysis** is the medical term for the **liquefaction of the vitreous humor**. The vitreous is normally a gel-like substance composed of 98% water, collagen fibrils, and hyaluronic acid. With age or certain pathological conditions (like high myopia), the hyaluronic acid molecules release their bound water, and the collagen network collapses. This process transforms the gel into a liquid state, creating fluid-filled pockets within the vitreous cavity. **2. Why the Other Options are Incorrect:** * **Option B (Black spots):** These are clinically known as **Muscae volitantes** (floaters). While liquefaction (synchysis) leads to floaters, the term synchysis specifically refers to the physical state of the vitreous, not the visual symptom. * **Option C (Collapse of the vitreous):** This is known as **Syneresis**. It refers to the shrinking or contraction of the vitreous gel as it separates from the liquid component. * **Option D (Detachment of the vitreous):** This is known as **Posterior Vitreous Detachment (PVD)**. It occurs when the posterior hyaloid membrane separates from the internal limiting membrane of the retina, often as a sequel to synchysis and syneresis. **3. NEET-PG High-Yield Clinical Pearls:** * **Synchysis Scintillans:** A condition where cholesterol crystals are found in a liquefied vitreous (usually post-trauma or inflammation). These crystals settle at the bottom due to gravity but shower upward like a "snow globe" when the eye moves. * **Asteroid Hyalosis:** Calcium-lipid complexes (asteroid bodies) suspended in a **solid/normal** vitreous. Unlike synchysis scintillans, these do not settle at the bottom. * **Most common cause of Synchysis:** Senile degeneration (aging) is the most common cause, followed by high myopia.

Q: Which of the following conditions is inherited in an autosomal dominant pattern?

Retinoblastoma. **Explanation:** **Retinoblastoma (Option A)** is the correct answer. While most cases of Retinoblastoma are sporadic, the **hereditary form** (associated with the Knudson’s "Two-Hit" Hypothesis) is inherited in an **autosomal dominant** pattern with high penetrance (90%). It involves a germline mutation in the **RB1 gene** located on chromosome **13q14**. Clinically, hereditary cases are often bilateral and multifocal, predisposing patients to secondary non-ocular tumors like osteosarcoma. **Analysis of Incorrect Options:** * **Ataxia Telangiectasia (Option B):** This is an **autosomal recessive** multisystem disorder characterized by cerebellar ataxia, oculocutaneous telangiectasia, and immunodeficiency due to mutations in the ATM gene. * **Bloom’s Syndrome (Option C):** This is an **autosomal recessive** chromosomal instability disorder. It is characterized by short stature, sun-sensitive erythematous rash, and a high predisposition to various cancers. * **Xeroderma Pigmentosum (Option D):** This is an **autosomal recessive** condition caused by a defect in nucleotide excision repair (DNA repair). It leads to extreme photosensitivity and a high risk of skin malignancies (SCC, BCC, Melanoma). **High-Yield Clinical Pearls for NEET-PG:** * **Most common intraocular tumor of childhood:** Retinoblastoma. * **Most common presenting sign:** Leukocoria (White pupillary reflex), followed by strabismus. * **Pathognomonic Histology:** Flexner-Wintersteiner rosettes. * **Calcification:** A hallmark feature seen on B-scan USG or CT scan (helps differentiate from Coats' disease). * **Rule of Thumb:** Most DNA repair defect syndromes (Bloom, XP, Fanconi) and metabolic errors are Autosomal Recessive, whereas structural protein defects or "Two-Hit" tumor syndromes (RB, NF, VHL) are often Autosomal Dominant.

Q: Retinal tear is associated with which degeneration?

Lattice retinal degeneration. **Explanation:** **Lattice Retinal Degeneration** is the most common peripheral retinal degeneration associated with **rhegmatogenous retinal detachment (RRD)**. It is characterized by thinning of the inner retinal layers and overlying vitreous liquefaction (synchysis), but most importantly, there is **strong vitreoretinal adhesion** at the margins of the lattice lesion. When the vitreous collapses (Posterior Vitreous Detachment), the traction at these adherent margins leads to **U-shaped (horseshoe) tears**, which allow fluid to enter the subretinal space, causing detachment. Approximately 30% of patients with RRD have underlying lattice degeneration. **Analysis of Incorrect Options:** * **Equatorial Drusen:** These are small, yellow-white deposits (extracellular material) located under the sensory retina. They are common age-related changes and do not predispose to retinal tears or detachment. * **Reticular Pigmentary Degeneration:** Also known as "senile pigmentary degeneration," it is a benign age-related change characterized by a honeycomb pattern of hyperpigmentation. It is not associated with an increased risk of retinal breaks. * **Paving Stone (Cobblestone) Degeneration:** This involves discrete areas of chorioretinal atrophy. While it looks significant on fundoscopy, the retina is actually firmly adherent to the underlying choroid in these areas, making it a "protective" factor against the spread of detachment; it does not cause tears. **High-Yield Clinical Pearls for NEET-PG:** * **Snail Track Degeneration:** Considered a variant of lattice; it also carries a risk of retinal holes. * **Most common site for Lattice:** Temporal quadrant (superior-temporal most frequent). * **Prophylaxis:** Laser photocoagulation or cryotherapy is indicated if lattice is associated with symptoms (flashes/floaters) or in the fellow eye of a patient who already had a retinal detachment.

Question 1

Which fundoscopic finding is characterized by a retinal hemorrhage with a white center?

Accepted Answer

Roth spot

Answer

Cotton wool spot

Answer

Flame shaped hemorrhage

Answer

Drusen

Question 2

All are true regarding retinitis pigmentosa EXCEPT?

Accepted Answer

ERG is abnormal

Answer

Pale disc

Answer

Attenuation of arteries

Answer

Waxy pigments

Question 3

Spontaneous regression of proliferative retinopathy may occur in which of the following conditions?

Accepted Answer

All of the above

Answer

Diabetic retinopathy

Answer

Proliferative sickle retinopathy

Answer

Retinopathy of prematurity

Question 4

A 45-year-old male presents with proliferative diabetic retinopathy and significant vitreomacular traction. What is the most appropriate treatment?

Accepted Answer

Vitrectomy with endophotocoagulation

Answer

Pan retinal photocoagulation

Answer

Intravitreal Ozurdex (dexamethasone implant)

Answer

Intravitreal anti-VEGF injection

Question 5

What causes a cherry red spot?

Accepted Answer

Berlin's edema

Answer

Central Retinal Vein Occlusion (CRVO)

Answer

Eales disease

Answer

All of the above

Question 6

Synchysis refers to:

Accepted Answer

Liquefaction of the vitreous

Answer

Black spots in front of the eyes

Answer

Collapse of the vitreous

Answer

Detachment of the vitreous

Question 7

Which of the following conditions is inherited in an autosomal dominant pattern?

Accepted Answer

Retinoblastoma

Answer

Ataxia telangiectasia

Answer

Bloom's syndrome

Answer

Xeroderma pigmentosa

Question 8

Acquired blue blindness is a feature of:

Accepted Answer

Increased sclerosis of the crystalline lens

Answer

Disease of the optic nerve

Answer

Disease of the macula

Answer

All of the above

Question 9

Retinal tear is associated with which degeneration?

Accepted Answer

Lattice retinal degeneration

Answer

Equatorial drusen

Answer

Reticular pigmentary degeneration

Answer

Paving stone degeneration

Question 10

All of the following are true about Retinitis punctata albescens except?

Accepted Answer

Particularly involves posterior pole of retina

Answer

Autosomal dominant

Answer

Retinal pigment deposition in epithelium

Answer

White dots on fundus examination

Diseases of the Retina — MCQs

Diseases of the Retina — MCQs

On this page

Practice by Chapter

Want unlimited practice?