Diseases of the Retina — MCQs

Diseases of the Retina Indian Medical PG Practice Questions and MCQs

Question 111: Non-inflammatory edema of the optic disc due to raised intracranial pressure is called?

A. Glaucomatous optic atrophy
B. Papilloedema (Correct Answer)
C. Optic neuritis
D. Bird shot retinopathy

Explanation: **Explanation:** **Papilloedema** is defined specifically as **passive, non-inflammatory swelling of the optic disc** resulting from **increased intracranial pressure (ICP)**. The mechanism involves the transmission of elevated ICP through the subarachnoid space surrounding the optic nerve, which leads to the stasis of axoplasmic flow at the lamina cribrosa. This results in axonal swelling and subsequent venous congestion. Crucially, papilloedema is almost always **bilateral**, though it may be asymmetrical. **Why other options are incorrect:** * **Glaucomatous optic atrophy:** This is characterized by progressive "cupping" of the optic disc due to elevated intraocular pressure (IOP), leading to the death of retinal ganglion cells, not disc edema. * **Optic neuritis:** This is an **inflammatory** condition of the optic nerve (often associated with Multiple Sclerosis). Unlike papilloedema, it typically presents with **sudden painful vision loss** and a Relative Afferent Pupillary Defect (RAPD). * **Birdshot retinopathy:** This is a rare form of bilateral posterior uveitis (HLA-A29 associated) characterized by multiple cream-colored spots on the fundus, not isolated disc edema. **High-Yield Clinical Pearls for NEET-PG:** * **Early Sign:** Loss of spontaneous venous pulsations (SVP) is one of the earliest signs of papilloedema. * **Visual Acuity:** In early/established papilloedema, visual acuity usually remains **normal**, which helps differentiate it from optic neuritis. * **Foster Kennedy Syndrome:** Characterized by optic atrophy in one eye (due to direct tumor compression) and papilloedema in the other (due to raised ICP), typically seen in frontal lobe tumors. * **Paton’s Lines:** Circumferential retinal folds seen at the temporal aspect of the swollen disc.

Question 112: Phenomenon in which all colors are seen as grey due to decreased sensitivity of cones is called?

A. Stile Crawford effect
B. Purkinje shift (Correct Answer)
C. Dark adaptation
D. Color blindness

Explanation: **Explanation:** The correct answer is **Purkinje shift**. This phenomenon describes the shift in peak spectral sensitivity of the eye toward shorter wavelengths as illumination levels drop. **1. Why Purkinje Shift is Correct:** During the transition from daylight (**photopic vision**) to twilight (**mesopic/scotopic vision**), the eye’s sensitivity shifts from the cones (peak sensitivity ~555 nm, yellow-green) to the rods (peak sensitivity ~507 nm, blue-green). As light intensity decreases, the cones become less sensitive, and the rods take over. Since rods cannot perceive color, objects lose their hue and appear in shades of grey. This explains why red flowers appear black or grey in the evening while blue objects appear relatively brighter. **2. Why the other options are incorrect:** * **Stiles-Crawford Effect:** This refers to the phenomenon where light entering the eye through the center of the pupil is perceived as brighter than light entering through the periphery. it is related to the directional sensitivity of **cones**. * **Dark Adaptation:** This is the physiological process by which the eye increases its sensitivity to light after entering a dark environment. It involves the regeneration of rhodopsin. While related, it describes the *process* of adjustment rather than the *spectral shift* in color perception. * **Color Blindness:** This is a structural or genetic deficiency in one or more cone pigments (e.g., protanopia, deuteranopia), leading to an inability to distinguish specific colors, regardless of light intensity. **High-Yield Clinical Pearls for NEET-PG:** * **Photopic vision:** Mediated by cones; maximum sensitivity at **555 nm**. * **Scotopic vision:** Mediated by rods; maximum sensitivity at **507 nm**. * **Mesopic vision:** The intermediate zone where both rods and cones function (where the Purkinje shift occurs). * **Vitamin A deficiency:** First affects scotopic vision, leading to Nyctalopia (night blindness).

Question 113: Eale's disease is characterized by?

A. Recurrent vitreous hemorrhage (Correct Answer)
B. Recurrent anterior uveitis
C. Recurrent subconjunctival hemorrhage
D. Recurrent choroidal hemorrhage

Explanation: **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.

Question 114: A 72-year-old white male complains of difficulty reading fine print and fatigue after prolonged reading. On examination, multiple, confluent soft drusen over the macula are present. What is the most probable diagnosis?

A. Cystoid macular edema
B. Central serous retinopathy (CSR)
C. Age-related macular degeneration (ARMD) (Correct Answer)
D. Macular hole

Explanation: ### Explanation The correct diagnosis is **Age-related Macular Degeneration (ARMD)**. **1. Why Option C is Correct:** The clinical presentation is classic for ARMD. The patient’s age (72 years), ethnicity (more common in Caucasians), and symptoms (difficulty reading fine print/fatigue) point toward macular dysfunction. The pathognomonic finding here is **soft drusen**. Drusen are yellowish deposits of extracellular material (lipofuscin) located between the retinal pigment epithelium (RPE) and Bruch’s membrane. While "hard" drusen can be a normal sign of aging, **large, confluent, soft drusen** are a major risk factor for progression to advanced ARMD (both dry and wet types). **2. Why Other Options are Incorrect:** * **A. Cystoid Macular Edema (CME):** Characterized by fluid-filled cysts in the Henle’s layer. On fundoscopy, it shows a "flower petal" appearance on FFA, not drusen. * **B. Central Serous Retinopathy (CSR):** Typically affects younger males (20–50 years) and is associated with stress or steroid use. It presents with a localized sensory retinal detachment ("ink-blot" or "smoke-stack" leak on FFA). * **C. Macular Hole:** Presents with a sudden drop in central vision and a distinct "punched-out" red circular lesion at the fovea (Watzke-Allen sign positive). **3. NEET-PG High-Yield Pearls:** * **Risk Factors:** Smoking (most significant modifiable risk), age, female gender, and family history. * **Amsler Grid:** Used for home monitoring to detect **metamorphopsia** (distortion of lines). * **Dry ARMD (Geographic Atrophy):** Most common type (90%); managed with AREDS-2 formula antioxidants. * **Wet ARMD (Exudative):** Characterized by **Choroidal Neovascularization (CNVM)**; treated with Intravitreal Anti-VEGF (e.g., Ranibizumab, Bevacizumab).

Question 115: A 29-year-old man with insulin-dependent diabetes mellitus (IDDM) for the last 14 years develops sudden vision loss. He has non-proliferating diabetic retinopathy. What is the most likely cause of his vision loss?

A. Macular edema (Correct Answer)
B. Vitreous hemorrhage
C. Subretinal hemorrhage
D. Retinal traction

Explanation: ### Explanation **Correct Answer: A. Macular Edema** In patients with **Non-Proliferative Diabetic Retinopathy (NPDR)**, the most common cause of vision loss is **Diabetic Macular Edema (DME)**. The underlying pathophysiology involves the breakdown of the blood-retinal barrier, leading to the leakage of fluid and plasma constituents (like hard exudates) into the macula. While NPDR itself is often asymptomatic in the periphery, involvement of the fovea results in a painless, gradual, or sudden decrease in central visual acuity. In this clinical scenario, since the patient is specifically noted to have NPDR, macular edema is the only complication listed that occurs without the presence of neovascularization. **Why the other options are incorrect:** * **B. Vitreous Hemorrhage:** This is a hallmark of **Proliferative Diabetic Retinopathy (PDR)**. It occurs when fragile new vessels (neovascularization) rupture. Since the question specifies the patient has NPDR, this is less likely. * **C. Subretinal Hemorrhage:** This is more commonly associated with Choroidal Neovascular Membranes (CNVM), seen in conditions like Wet Age-Related Macular Degeneration, rather than standard diabetic retinopathy. * **D. Retinal Traction:** Tractional Retinal Detachment (TRD) is a late-stage complication of **PDR**, where fibrovascular membranes contract and pull the retina away from the RPE. **NEET-PG High-Yield Pearls:** * **Most common cause of legal blindness in diabetics:** Diabetic Macular Edema (DME). * **Most common cause of sudden, total vision loss in PDR:** Vitreous Hemorrhage. * **Investigation of choice for DME:** Optical Coherence Tomography (OCT) – used to measure central macular thickness. * **Gold Standard for diagnosing leakage:** Fundus Fluorescein Angiography (FFA). * **Treatment:** Intravitreal Anti-VEGF agents (e.g., Ranibizumab, Bevacizumab) are now the first-line treatment for clinically significant macular edema.

Question 116: Macular degeneration is caused by:

A. Chronic alcoholism
B. Smoking (Correct Answer)
C. Diabetes mellitus
D. Eales disease

Explanation: **Explanation:** Age-Related Macular Degeneration (ARMD) is a leading cause of irreversible visual loss in the elderly. Its pathogenesis involves oxidative stress, chronic inflammation, and cumulative damage to the Retinal Pigment Epithelium (RPE) and Bruch’s membrane. **Why Smoking is Correct:** Smoking is the most significant **modifiable risk factor** for ARMD. It increases the risk by 2 to 4 times. The underlying mechanism involves: * **Oxidative Stress:** Cigarette smoke contains free radicals that damage the RPE. * **Vascular Effects:** It causes vasoconstriction and reduces choroidal blood flow. * **Inflammation:** It lowers plasma levels of protective antioxidants (like Vitamin C and Lutein) and activates the complement pathway, accelerating drusen formation. **Analysis of Incorrect Options:** * **A. Chronic Alcoholism:** While heavy alcohol consumption is a general health risk, it is not a primary or proven independent risk factor for macular degeneration. * **C. Diabetes Mellitus:** Diabetes is the primary cause of **Diabetic Retinopathy** (microangiopathy). While it affects the retina, it is a distinct pathological entity from ARMD. * **D. Eales Disease:** This is an idiopathic inflammatory peripheral retinal perivasculitis (primarily affecting young males). It leads to peripheral non-perfusion and neovascularization, not primary macular degeneration. **High-Yield Clinical Pearls for NEET-PG:** * **Non-Modifiable Risk Factors:** Age (strongest), Female gender, and Family history (CFH gene mutation). * **Hallmark Lesion:** **Drusen** (yellowish deposits between the RPE and Bruch’s membrane). * **Wet ARMD:** Characterized by Choroidal Neovascularization (CNVM). The drug of choice is **Anti-VEGF** (e.g., Ranibizumab, Bevacizumab). * **Prevention:** The **AREDS-2 formula** (Vitamin C, E, Zinc, Copper, Lutein, and Zeaxanthin) is used to slow progression in intermediate stages. Note: Beta-carotene is avoided in smokers due to increased lung cancer risk.

Question 117: The superficial retinal hemorrhage is seen in which layer of the retina?

A. Inner plexiform layer
B. Nerve fibre layer (Correct Answer)
C. Inner nuclear layer
D. Outer nuclear layer

Explanation: **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.

Question 118: Which of the following is a characteristic retinal finding on examining a patient with malignant hypertension?

A. Exudates
B. Cotton wool spots (Correct Answer)
C. Retinal haemorrhage
D. Narrowing of arterioles

Explanation: **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).

Question 119: Cherry Red spot is found in all of the following conditions except?

A. Niemann-Pick disease
B. GM1 gangliosidosis
C. Krabbe's disease (Correct Answer)
D. Multiple sulfatase deficiency

Explanation: ### 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).

Question 120: 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?

A. Vision is retained until a late stage.
B. Central vision is lost early. (Correct Answer)
C. It affects both rods and cones.
D. Tunnel vision may be observed.

Explanation: **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).

Practice by Chapter

Retinal Anatomy and Physiology

Practice Questions

Age-Related Macular Degeneration

Practice Questions

Diabetic Retinopathy

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Retinal Vascular Diseases

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Retinal Detachment

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Hereditary Retinal Dystrophies

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Inflammatory Retinal Diseases

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Retinal Tumors

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Retinopathy of Prematurity

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Retinal Imaging Techniques

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Intravitreal Pharmacotherapy

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Vitreoretinal Surgery

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