Diseases of the Retina Practice Questions

Q: Eale's disease is characterized by?

Recurrent vitreous hemorrhage. **Explanation:** **Eales’ Disease** is an idiopathic, inflammatory peripheral retinal perivasculitis. It primarily affects healthy young adult males (20–40 years). The hallmark of the disease is a triad of **retinal perivasculitis (usually phlebitis), peripheral retinal ischemia, and neovascularization.** 1. **Why Option A is Correct:** The primary pathology involves peripheral retinal capillary non-perfusion, which leads to the formation of **neovascularization elsewhere (NVE)**. These fragile new vessels are prone to bleeding into the vitreous cavity. Because the underlying ischemia persists without treatment, these episodes of **recurrent vitreous hemorrhage** are the classic clinical presentation, often described as "sudden painless floaters or vision loss." 2. **Why the other options are incorrect:** * **Option B:** While Eales’ can occasionally show mild anterior chamber reaction, it is primarily a **posterior segment** vascular disease, not a classic recurrent anterior uveitis. * **Option C:** Subconjunctival hemorrhage is a benign condition involving surface vessels; it has no pathological link to the retinal vasculitis seen in Eales’. * **Option D:** Choroidal hemorrhages occur deep to the retina (e.g., in ARMD or trauma). Eales’ disease specifically targets the **retinal vasculature**. **High-Yield Clinical Pearls for NEET-PG:** * **Demographics:** Most common in Asian (Indian) males in their 2nd–3rd decade. * **Association:** Strongly associated with hypersensitivity to **Tuberculoprotein** (Mantoux test is often positive), though the exact etiology remains idiopathic. * **Stages:** Perivasculitis (sheathing) → Non-perfusion → Neovascularization → Vitreous Hemorrhage. * **Management:** Scatter laser photocoagulation (PRP) for ischemia/neovascularization and anti-VEGF injections. Vitrectomy is indicated for non-clearing vitreous hemorrhage.

Q: Amaurotic cat's eye reflex is seen in:

Retinoblastoma. **Explanation:** **Amaurotic cat’s eye reflex**, also known as **leukocoria** (white pupillary reflex), is the most common presenting sign of **Retinoblastoma**, the most common intraocular malignancy of childhood. In a normal eye, the pupil appears red during a fundus examination (red reflex) due to the vascularity of the choroid. In Retinoblastoma, a whitish-yellow mass grows from the retina into the vitreous cavity (endophytic growth), reflecting light back through the pupil and mimicking the glow seen in a cat's eye. **Analysis of Options:** * **Retinoblastoma (Correct):** The reflex is caused by the solid, calcified tumor mass behind the lens. It is a "medical emergency" to rule out malignancy in any child presenting with leukocoria. * **Papilloedema:** This is passive swelling of the optic disc due to increased intracranial pressure. It affects the optic nerve head but does not create a large intraocular mass or a white pupillary reflex. * **Papillitis:** This is inflammatory swelling of the optic disc (a form of optic neuritis). Clinical features include sudden vision loss and an afferent pupillary defect, not leukocoria. * **Retinitis Pigmentosa:** This is a degenerative rod-cone dystrophy characterized by "bone-spicule" pigmentation in the mid-periphery and arteriolar attenuation. The pupil remains dark or shows a normal red reflex. **High-Yield Clinical Pearls for NEET-PG:** * **Differential Diagnosis of Leukocoria:** Retinoblastoma (most common), Congenital Cataract, Coats’ Disease, Persistent Fetal Vasculature (PFV), and Retinopathy of Prematurity (ROP). * **Pathognomonic Sign:** Chalky white **calcification** seen on B-scan USG or CT scan is highly suggestive of Retinoblastoma. * **Flexner-Wintersteiner Rosettes:** These are the characteristic histological markers for Retinoblastoma. * **Genetics:** Associated with the **RB1 gene** on chromosome **13q14**.

Q: The superficial retinal hemorrhage is seen in which layer of the retina?

Nerve fibre layer. **Explanation:** The location and appearance of retinal hemorrhages are determined by the anatomical arrangement of the specific retinal layer in which they occur. **Why the Nerve Fibre Layer (NFL) is correct:** Superficial retinal hemorrhages occur in the **Nerve Fibre Layer**. Because the axons in this layer are arranged horizontally and parallel to the retinal surface, blood tracks along these fibers. This results in the characteristic **"Flame-shaped"** or linear appearance with feathered margins. These are commonly seen in conditions like Hypertension, Central Retinal Vein Occlusion (CRVO), and Papilledema. **Analysis of Incorrect Options:** * **Inner Nuclear Layer (INL) & Outer Nuclear Layer (ONL):** Hemorrhages in these deeper layers are constrained by the vertically oriented Müller cells. This pressure forces the blood into a circular shape, leading to **"Dot and Blot" hemorrhages**, typically seen in Diabetic Retinopathy. * **Inner Plexiform Layer (IPL):** While this layer contains synaptic connections, it is not the primary site for the classic superficial flame-shaped hemorrhages described in clinical practice. **Clinical Pearls for NEET-PG:** 1. **Flame-shaped Hemorrhage:** Superficial (Nerve Fibre Layer). 2. **Dot and Blot Hemorrhage:** Deep (Inner Nuclear Layer). 3. **Boat-shaped Hemorrhage:** Preretinal/Sub-hyaloid space (between the retina and vitreous). 4. **Roth Spots:** Flame-shaped hemorrhages with a central white spot (leukemic cells or fibrin), classically seen in Subacute Bacterial Endocarditis (SABE), Leukemia, and Severe Anemia. 5. **Microaneurysms:** The earliest clinical sign of Diabetic Retinopathy, occurring in the Inner Nuclear Layer.

Q: Which of the following is a characteristic retinal finding on examining a patient with malignant hypertension?

Cotton wool spots. **Explanation:** In the context of **Malignant Hypertension** (Grade IV Hypertensive Retinopathy according to the Modified Scheie Classification), the hallmark finding is **Cotton Wool Spots**. **Why Cotton Wool Spots is the correct answer:** Malignant hypertension is characterized by severe, acute elevations in blood pressure that lead to **arteriolar fibrinoid necrosis**. This causes acute focal ischemia of the retinal nerve fiber layer (RNFL). The resulting interruption of axoplasmic flow leads to the accumulation of "cytoid bodies," which appear clinically as fluffy, white **Cotton Wool Spots**. While other findings occur, Cotton Wool Spots are the classic indicator of acute retinal ischemia in hypertensive emergencies. **Analysis of Incorrect Options:** * **A. Exudates:** Hard exudates (lipid deposits) are common in chronic hypertension (Grade III) and form a "macular star," but they are less specific for the acute ischemic crisis of malignant hypertension than cotton wool spots. * **C. Retinal Hemorrhage:** Flame-shaped hemorrhages occur in Grade III and IV, but they are non-specific and seen in various conditions like RVO or severe anemia. * **D. Narrowing of Arterioles:** This is a feature of **Grade I** (generalized narrowing) and **Grade II** (focal narrowing) retinopathy. It represents a compensatory response rather than the end-organ damage seen in the malignant phase. **High-Yield Clinical Pearls for NEET-PG:** * **Keith-Wagener-Barker Classification:** Grade IV is defined by the presence of **Papilledema** (optic disc edema), which is the definitive sign of malignant hypertension. * **Cotton Wool Spots** are also known as "soft exudates," though they are not true exudates but micro-infarcts. * **Differential Diagnosis:** Cotton wool spots are also a key feature of Diabetic Retinopathy, HIV retinopathy, and Systemic Lupus Erythematosus (SLE).

Q: Cherry Red spot is found in all of the following conditions except?

Krabbe's disease. ### Explanation The **Cherry Red Spot** is a classic ophthalmological sign characterized by a bright red fovea surrounded by a pale, opaque, or grayish-white retina. This appearance occurs because the fovea lacks the ganglion cell layer; therefore, the underlying vascular choroid remains visible, while the surrounding retina becomes opaque due to the accumulation of lipids or metabolic byproducts within the ganglion cells. **Why Krabbe’s Disease is the Correct Answer:** Krabbe’s disease (Globoid cell leukodystrophy) is a lysosomal storage disorder caused by a deficiency of the enzyme galactocerebrosidase. Unlike other sphingolipidoses, it primarily affects the **myelin sheath** (white matter) of the nervous system rather than the retinal ganglion cells. Therefore, it does not present with a cherry red spot. Instead, it typically presents with **optic atrophy**. **Analysis of Incorrect Options:** * **Niemann-Pick Disease:** Caused by sphingomyelinase deficiency. Type A is a classic cause of a cherry red spot (seen in ~50% of cases). * **GM1 Gangliosidosis:** A lysosomal storage disorder where GM1 ganglioside accumulates in the retina. It presents with a cherry red spot in approximately 50% of patients (Type I). * **Multiple Sulfatase Deficiency:** This rare condition combines features of metachromatic leukodystrophy and mucopolysaccharidosis. It is a recognized cause of a cherry red spot. **High-Yield Clinical Pearls for NEET-PG:** * **Mnemonic for Cherry Red Spot:** "**S**ome **M**en **A**re **C**razy **K**illers" (**S**andhoff/Tay-Sachs, **M**etachromatic Leukodystrophy, **A**rtery Occlusion [CRAO], **C**herry Red Spot Myoclonus Syndrome/Sialidosis, **K**rabbe's is the **EXCEPT**). * **Most Common Cause:** Central Retinal Artery Occlusion (CRAO). * **Most Common Metabolic Cause:** Tay-Sachs Disease (GM2 Gangliosidosis). * **Gaucher’s Disease:** Usually does *not* have a cherry red spot (except for the rare Type 3).

Q: A family presents with a history of progressive vision loss, particularly at night. The diagnosis of retinitis pigmentosa is made. Which of the following statements is NOT true about retinitis pigmentosa?

Central vision is lost early.. **Explanation:** Retinitis Pigmentosa (RP) is a hereditary, progressive dystrophy primarily affecting the **photoreceptors** and the retinal pigment epithelium (RPE). 1. **Why Option B is the Correct Answer (The False Statement):** In RP, the **rods are affected first** and more severely than the cones. Since rods are concentrated in the mid-periphery of the retina, the disease begins with night blindness (nyctalopia) and peripheral field loss. The **macula (central vision)**, which is rich in cones, is typically spared until the very late stages of the disease. Therefore, saying central vision is lost early is clinically incorrect. 2. **Analysis of Other Options:** * **Option A:** True. Because the fovea is preserved for a long time, patients often maintain 6/6 or 20/20 visual acuity despite having a severely constricted field. * **Option C:** True. Although it starts as a rod-led dystrophy, it eventually involves the cones, leading to total blindness in advanced stages. * **Option D:** True. As the peripheral field progressively constricts, the patient is left with only a small island of central vision, a clinical phenomenon known as **"Tunnel Vision."** **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad:** 1. Bony-spicule pigmentation (perivascular), 2. Arteriolar attenuation (narrowing), 3. Waxy pallor of the optic disc. * **ERG Findings:** The Electroretinogram (ERG) is the most sensitive test; it shows a **subnormal or extinguished** (flat) response even before fundus changes appear. * **Inheritance:** Most common is Autosomal Recessive; most severe is X-linked. * **Associated Conditions:** Usher Syndrome (deafness), Laurence-Moon-Biedl Syndrome (obesity, polydactyly, hypogonadism).

Q: Which of the following is NOT true about soft exudates (cotton wool patches on retina)?

In late stages, are converted into hard exudates. **Explanation:** Soft exudates, commonly known as **Cotton Wool Spots (CWS)**, are not true exudates. They represent micro-infarctions of the retinal nerve fiber layer (RNFL). **Why Option D is the correct answer (False statement):** Soft exudates and hard exudates have entirely different pathophysiologies. Soft exudates are caused by axoplasmic stasis in the RNFL, whereas hard exudates are lipid deposits resulting from chronic vascular leakage (e.g., in Diabetic Retinopathy). **Soft exudates never convert into hard exudates.** Instead, they typically fade and disappear within 4 to 6 weeks as the debris is cleared by macrophages, leaving behind a localized area of thinned retina. **Analysis of other options:** * **Option A:** They are a hallmark sign of **retinal hypoxia** and ischemia. They occur due to the occlusion of terminal retinal arterioles. * **Option B:** When ischemia occurs, axoplasmic transport is interrupted. This leads to the accumulation of organelles (mitochondria and debris) at the edge of the infarct, causing **swelling of the nerve fiber layer**. * **Option C:** Because they represent an active process of ischemia and subsequent resolution, their appearance, size, and **shape change frequently** over a few weeks. **NEET-PG High-Yield Pearls:** * **Histology:** The characteristic finding in soft exudates is the **Cytoid Body** (swollen axonal ends containing eosinophilic material). * **Common Causes:** Diabetic Retinopathy (Pre-proliferative stage), Hypertension (Grade III Keith-Wagener-Barker), HIV retinopathy, and Retinal Vein Occlusions. * **Differential:** Hard exudates are found in the Outer Plexiform Layer (Henle’s layer in the macula), while Soft exudates are in the Nerve Fiber Layer.

Q: Which histological type of uveal malignant melanoma has the worst prognosis?

Epithelioid. **Explanation:** The prognosis of uveal malignant melanoma is primarily determined by its histological cell type, as classified by the **Callender classification**. **Why Epithelioid is Correct:** **Epithelioid cells** are large, polygonal cells with abundant cytoplasm, distinct cell borders, and prominent nucleoli. They exhibit high mitotic activity and a greater tendency for hematogenous spread (especially to the liver). Histologically, they lack the cohesive properties of spindle cells, making them the most aggressive cell type with the **worst prognosis** (5-year survival rate is approximately 25-30%). **Analysis of Incorrect Options:** * **A. Spindle A:** These are elongated cells with slender nuclei and no prominent nucleoli. They are the most benign form with the **best prognosis**. * **B. Spindle B:** These cells are oval with prominent nucleoli. While more aggressive than Spindle A, they still carry a relatively favorable prognosis compared to epithelioid cells. * **D. Mixed:** This type contains both spindle and epithelioid cells. Its prognosis is intermediate—worse than pure spindle cell tumors but better than pure epithelioid tumors. **High-Yield Clinical Pearls for NEET-PG:** * **Most common primary intraocular malignancy in adults:** Uveal Melanoma. * **Most common site of metastasis:** Liver (95% of cases). * **Cytogenetic Marker:** Monosomy 3 is a strong predictor of poor prognosis and metastatic risk. * **Callender Classification (Best to Worst Prognosis):** Spindle A > Spindle B > Mixed > Epithelioid. * **Other poor prognostic factors:** Large tumor size, ciliary body involvement, and extraocular extension.

Q: Which of the following is NOT an ocular emergency?

Central serous retinopathy. ### Explanation In ophthalmology, an **ocular emergency** is a condition that requires immediate intervention (within minutes to hours) to prevent permanent vision loss or irreversible structural damage. **Why Central Serous Retinopathy (CSR) is the correct answer:** CSR is characterized by a localized serous detachment of the neurosensory retina at the macula, typically seen in young to middle-aged adults (often associated with Type A personalities or steroid use). Most cases are **self-limiting** and resolve spontaneously within 3–4 months without active treatment. While it causes blurred vision and metamorphopsia, it is considered an elective clinical condition rather than an emergency. **Why the other options are emergencies:** * **Angle Closure Glaucoma:** A true emergency where a sudden rise in intraocular pressure (IOP) can cause permanent optic nerve damage and blindness within hours if not treated with immediate pressure-lowering agents and peripheral iridotomy. * **Central Retinal Artery Occlusion (CRAO):** Often called an "eye stroke," the retina can only survive total ischemia for about 90–100 minutes. Immediate measures (e.g., ocular massage, paracentesis) are required to restore blood flow. * **Retinal Detachment (RD):** Specifically "macula-on" RD is a surgical emergency. Prompt intervention is necessary to prevent the detachment from involving the fovea, which would drastically worsen the visual prognosis. **High-Yield Clinical Pearls for NEET-PG:** * **CRAO:** Look for "Cherry Red Spot" and "Cattle-track appearance" of vessels. * **CSR:** Look for "Smokestack appearance" or "Ink-blot appearance" on Fundus Fluorescein Angiography (FFA). * **Chemical Injuries:** The only ocular emergency where treatment (irrigation) starts **before** taking a visual acuity history. * **Sudden Painless Loss of Vision:** Differential includes CRAO, RD, and Vitreous Hemorrhage.

Question 1

Phenomenon in which all colors are seen as grey due to decreased sensitivity of cones is called?

Accepted Answer

Purkinje shift

Answer

Stile Crawford effect

Answer

Dark adaptation

Answer

Color blindness

Question 2

Eale's disease is characterized by?

Accepted Answer

Recurrent vitreous hemorrhage

Answer

Recurrent anterior uveitis

Answer

Recurrent subconjunctival hemorrhage

Answer

Recurrent choroidal hemorrhage

Question 3

Amaurotic cat's eye reflex is seen in:

Accepted Answer

Retinoblastoma

Answer

Papilloedema

Answer

Papillitis

Answer

Retinitis pigmentosa

Question 4

The superficial retinal hemorrhage is seen in which layer of the retina?

Accepted Answer

Nerve fibre layer

Answer

Inner plexiform layer

Answer

Inner nuclear layer

Answer

Outer nuclear layer

Question 5

Which of the following is a characteristic retinal finding on examining a patient with malignant hypertension?

Accepted Answer

Cotton wool spots

Answer

Exudates

Answer

Retinal haemorrhage

Answer

Narrowing of arterioles

Question 6

Cherry Red spot is found in all of the following conditions except?

Accepted Answer

Krabbe's disease

Answer

Niemann-Pick disease

Answer

GM1 gangliosidosis

Answer

Multiple sulfatase deficiency

Question 7

A family presents with a history of progressive vision loss, particularly at night. The diagnosis of retinitis pigmentosa is made. Which of the following statements is NOT true about retinitis pigmentosa?

Accepted Answer

Central vision is lost early.

Answer

Vision is retained until a late stage.

Answer

It affects both rods and cones.

Answer

Tunnel vision may be observed.

Question 8

Which of the following is NOT true about soft exudates (cotton wool patches on retina)?

Accepted Answer

In late stages, are converted into hard exudates

Answer

Are a sign of retinal hypoxia

Answer

Formed due to swelling of the nerve fibre layer

Answer

Frequently change their shape

Question 9

Which histological type of uveal malignant melanoma has the worst prognosis?

Accepted Answer

Epithelioid

Answer

Spindle A

Answer

Spindle B

Answer

Mixed

Question 10

Which of the following is NOT an ocular emergency?

Accepted Answer

Central serous retinopathy

Answer

Angle closure glaucoma

Answer

Retinal detachment

Answer

Central retinal artery occlusion

Diseases of the Retina — MCQs

Diseases of the Retina — MCQs

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