Diseases of the Retina — MCQs

Diseases of the Retina Indian Medical PG Practice Questions and MCQs

Question 41: Which of the following groups of drugs can cause cystoid macular edema?

A. Prostaglandin F2a analogue
B. Prostaglandin E2 analogues (Correct Answer)
C. Oral corticosteroids
D. Alpha blockers

Explanation: **Explanation:** Cystoid Macular Edema (CME) is characterized by the accumulation of fluid in the outer plexiform (Henle’s) and inner nuclear layers of the retina, leading to a "petaloid" appearance on fluorescein angiography. **1. Why Prostaglandin E2 (PGE2) analogues are correct:** Prostaglandins are potent inflammatory mediators. PGE2 analogues (and certain PGF2α analogues like Latanoprost) are known to increase vascular permeability and breakdown the blood-retinal barrier. This allows fluid leakage into the macula, particularly in aphakic or pseudophakic patients where the posterior capsule is not intact. **2. Analysis of Incorrect Options:** * **Prostaglandin F2α analogues:** While specific drugs in this class (e.g., Latanoprost) are notorious for causing CME, the question specifically highlights **PGE2** as the primary mediator of inflammation-induced edema in this context. In many standardized exams, PGE2 is considered the more potent inflammatory trigger for CME. * **Oral Corticosteroids:** These are actually used to **treat** CME by stabilizing the blood-retinal barrier and reducing inflammation. However, note that corticosteroids can cause other ocular side effects like cataracts and secondary glaucoma. * **Alpha Blockers:** Systemic alpha-blockers (e.g., Tamsulosin) are associated with **Intraoperative Floppy Iris Syndrome (IFIS)** during cataract surgery, not CME. **High-Yield Clinical Pearls for NEET-PG:** * **Drug-Induced CME Mnemonic (D-E-P-O-T):** **D**ipivefrin, **E**pinephrine, **P**rostaglandins (Latanoprost), **O**cular Nicotinic acid/Niacin, **T**axanes (Paclitaxel). * **Irvine-Gass Syndrome:** CME occurring specifically after cataract surgery (peaks at 6–10 weeks). * **Gold Standard Investigation:** Optical Coherence Tomography (OCT) shows cystic spaces; Fluorescein Angiography (FFA) shows a classic **"Flower-petal appearance."** * **Topical Carbonic Anhydrase Inhibitors (Dorzolamide):** Often used to treat CME by pumping fluid out of the subretinal space.

Question 42: Development of diabetic retinopathy depends on which of the following factors?

A. Intensity of the disease
B. Age of onset
C. Duration of the disease
D. Any of the above (Correct Answer)

Explanation: **Explanation:** The development and progression of Diabetic Retinopathy (DR) are multifactorial, influenced by the metabolic control, chronicity, and timing of the disease. 1. **Duration of the disease (Most Important Factor):** This is the single most significant predictor of DR. For Type 1 Diabetics, DR is rarely present at diagnosis but affects nearly 95% of patients after 20 years. In Type 2 Diabetics, about 60% show signs of DR after 20 years. 2. **Intensity of the disease (Metabolic Control):** Poor glycemic control (reflected by high HbA1c levels) accelerates microvascular damage. Chronic hyperglycemia leads to basement membrane thickening, pericyte loss, and microaneurysm formation. 3. **Age of onset:** While DR is rare before puberty, the age at which diabetes is diagnosed influences the cumulative lifetime risk. Patients diagnosed at a younger age have a longer duration of exposure to hyperglycemia, increasing the likelihood of developing proliferative changes. **Why "Any of the above" is correct:** All three factors—how long the patient has had the disease, how well it is controlled, and when it started—interact to determine the risk and severity of retinal damage. **High-Yield Clinical Pearls for NEET-PG:** * **First clinical sign:** Microaneurysms (located in the inner nuclear layer). * **First pathological sign:** Loss of pericytes and basement membrane thickening. * **Pregnancy:** Can lead to rapid progression of pre-existing DR (requires close monitoring). * **Hypertension & Nephropathy:** These are strong systemic co-factors that worsen the prognosis of DR. * **Classification:** Remember the ETDRS classification (NPDR vs. PDR) for management questions.

Question 43: What is the indication for using indocyanine green angiography?

A. Occult choroidal neovascularization (Correct Answer)
B. Conjunctivitis
C. Vitreous hemorrhage
D. Corneal ulcer

Explanation: **Explanation:** **Indocyanine Green Angiography (ICGA)** is a diagnostic imaging technique used to visualize the **choroidal circulation**. Unlike Fluorescein Angiography (FFA), which uses a water-soluble dye that leaks from choriocapillaris, ICG dye is 98% protein-bound. This property prevents it from leaking through the fenestrations of the choriocapillaris, allowing for superior visualization of deeper choroidal vessels. **Why Option A is correct:** In Age-Related Macular Degeneration (ARMD), **Occult Choroidal Neovascularization (CNV)** is often hidden by subretinal blood, exudates, or pigment epithelial detachments on a standard FFA. Because ICG dye emits fluorescence in the **near-infrared spectrum**, it can penetrate the retinal pigment epithelium (RPE), xanthophyll pigments, and thin layers of blood. This makes ICGA the gold standard for identifying occult CNV, Polypoidal Choroidal Vasculopathy (PCV), and retinal angiomatous proliferation (RAP). **Why other options are incorrect:** * **B & D (Conjunctivitis/Corneal Ulcer):** These are anterior segment pathologies diagnosed via slit-lamp examination and microbiological cultures. Angiography has no role here. * **C (Vitreous Hemorrhage):** Dense hemorrhage obscures the view of the fundus. The investigation of choice to rule out retinal detachment in such cases is **B-Scan Ultrasonography**. **High-Yield Clinical Pearls for NEET-PG:** * **Dye Properties:** ICG is iodine-based; it is **contraindicated** in patients with **shellfish or iodine allergy**. * **Excretion:** Unlike Fluorescein (renal excretion), ICG is taken up by the liver and excreted in **bile**. * **Wavelength:** ICG uses a longer wavelength (~800-840 nm) compared to FFA (~490-530 nm), allowing deeper tissue penetration.

Question 44: A young adult male presented with sudden painless loss of vision. He recovered spontaneously within 3 months. What is the most likely cause of his blindness?

A. Central serous retinopathy (Correct Answer)
B. Macular hole
C. Myopic crescent
D. Vitreous hemorrhage

Explanation: **Explanation:** **1. Why Central Serous Retinopathy (CSR) is correct:** CSR is characterized by a localized serous detachment of the neurosensory retina at the macula due to leakage from the choriocapillaris through a defect in the Retinal Pigment Epithelium (RPE). It typically affects **young to middle-aged males** (Type A personalities) and presents as **sudden, painless blurring of vision**, micropsia, or metamorphopsia. The hallmark of CSR is its **self-limiting nature**, with most cases resolving spontaneously within 3–4 months, matching the clinical timeline provided in the question. **2. Why the other options are incorrect:** * **Macular hole:** This leads to a permanent central scotoma and significant vision loss that does **not** resolve spontaneously; it usually requires surgical intervention (vitrectomy). * **Myopic crescent:** This is a degenerative change seen in pathological myopia. While it indicates high myopia, it does not cause sudden vision loss or spontaneous recovery. * **Vitreous hemorrhage:** While it causes sudden painless vision loss, the recovery depends on the underlying cause (e.g., trauma, proliferative retinopathy). It rarely resolves completely and spontaneously within a fixed 3-month window without leaving debris or requiring treatment. **High-Yield Clinical Pearls for NEET-PG:** * **Risk Factors:** Stress, steroid use (topical, systemic, or inhaled), and pregnancy. * **FFA Finding:** Classic **"Ink-blot"** appearance (most common) or **"Smoke-stack"** appearance (due to convection currents). * **OCT Finding:** Shows neurosensory detachment with subretinal fluid. * **Management:** Observation is the first line. If non-resolving, Micropulse Laser or Photodynamic Therapy (PDT) may be considered.

Question 45: Foster's fusch's spots are seen in which refractive error?

A. Hypermetropia
B. Myopia (Correct Answer)
C. Astigmatism
D. None of the above

Explanation: **Explanation:** **Foster-Fuchs’ Spots** (or simply Fuchs’ spots) are a classic fundoscopic finding in **Pathological (High) Myopia**. **Why Myopia is correct:** In pathological myopia (typically > -6.00D or axial length >26.5 mm), the progressive elongation of the eyeball leads to mechanical stretching of the retina and choroid. This stress causes cracks in the Bruch’s membrane, known as **Lacquer cracks**. These cracks can lead to localized Subretinal Neovascularization (SRNV). When these fragile new vessels bleed and subsequently undergo organization and scarring, they leave behind a circular, pigmented (dark/blackish) lesion at the macula. This pigmented scar is the **Foster-Fuchs’ spot**, which results in a significant loss of central vision. **Why other options are incorrect:** * **Hypermetropia:** This involves a shorter axial length. While it is associated with conditions like "crowded discs" or predispositions to angle-closure glaucoma, it does not involve the degenerative stretching or Bruch’s membrane ruptures seen in myopia. * **Astigmatism:** This is a refractive error caused by an irregular curvature of the cornea or lens. It is an optical distortion and does not involve the structural/degenerative chorioretinal changes required to form Fuchs’ spots. **High-Yield Clinical Pearls for NEET-PG:** * **Pathognomonic triad of Pathological Myopia:** Posterior Staphyloma, Lacquer Cracks, and Foster-Fuchs’ spots. * **Lacquer Cracks:** These are the precursors to Fuchs’ spots and represent healed ruptures of the Bruch’s membrane. * **Other Myopic findings:** Myopic crescent (temporal), Weiss ring (due to PVD), and Lattice degeneration (predisposing to Retinal Detachment). * **Management:** If active CNVM is present, Anti-VEGF injections are the treatment of choice.

Question 46: Attenuated retinal vessels with bony corpuscular-like lesions are seen in which condition?

A. Diabetes mellitus
B. Hypertension
C. Retinitis pigmentosa (Correct Answer)
D. Eales disease

Explanation: **Explanation:** The clinical triad of **attenuated retinal vessels**, **bony spicule-like pigmentation**, and **waxy pallor of the optic disc** is the hallmark of **Retinitis Pigmentosa (RP)**. **Why Retinitis Pigmentosa is correct:** RP is a hereditary progressive rod-cone dystrophy. The "bony corpuscular" lesions are caused by the migration of retinal pigment epithelium (RPE) cells into the sensory retina, typically accumulating around the retinal veins in a characteristic branching pattern. The arteriolar attenuation occurs as a secondary response to reduced retinal metabolic demand as photoreceptors degenerate. **Why the other options are incorrect:** * **Diabetes Mellitus:** Characterized by microaneurysms, dot-and-blot hemorrhages, hard exudates, and neovascularization (PDR), but not bony spicules. * **Hypertension:** Features generalized arteriolar narrowing, AV nipping, flame-shaped hemorrhages, and cotton wool spots (Grade III/IV), but lacks pigmentary migration. * **Eales Disease:** An idiopathic peripheral perivasculitis (primarily affecting young males) characterized by peripheral non-perfusion, "sea-fan" neovascularization, and recurrent vitreous hemorrhages. **High-Yield Clinical Pearls for NEET-PG:** * **Earliest Symptom:** Nyctalopia (Night blindness) due to early rod involvement. * **Visual Field:** Ring scotoma progressing to "Tubular vision." * **ERG Findings:** The Electroretinogram (ERG) is **subnormal or extinguished** (flat) even in early stages, making it the most sensitive diagnostic test. * **Associations:** Often associated with Usher syndrome (deafness), Posterior Subcapsular Cataract (PSC), and Cystoid Macular Edema (CME).

Question 47: A 60-year-old man with a 10-year history of hypertension and diabetes mellitus presents with reduced vision in one eye. Fundus examination reveals a central bleed in the affected eye, while the fellow eye is normal. What is the most likely diagnosis?

A. Retinal tear
B. Optic neuritis
C. Diabetic retinopathy (Correct Answer)
D. Hypertensive retinopathy

Explanation: **Explanation:** The correct answer is **Diabetic Retinopathy (DR)**. In a patient with a long-standing history of diabetes mellitus (10 years), the most common cause of sudden or subacute vision loss associated with a "central bleed" is proliferative diabetic retinopathy (PDR). The "central bleed" typically refers to a **vitreous hemorrhage** or a **pre-retinal (subhyaloid) hemorrhage** originating from fragile neovascularization at the disc (NVD) or elsewhere (NVE). While the patient also has hypertension, diabetes is a more potent risk factor for significant intraocular bleeding. **Why the other options are incorrect:** * **Retinal tear:** While it can cause vitreous hemorrhage, it is usually associated with symptoms like flashes (photopsia) and floaters, often in myopic eyes or following trauma, rather than a systemic metabolic history. * **Optic neuritis:** This typically presents with painful eye movements, a relative afferent pupillary defect (RAPD), and a pale or swollen disc, but **not** with a retinal or central hemorrhage. * **Hypertensive retinopathy:** While it causes flame-shaped hemorrhages and exudates, it rarely causes a massive "central bleed" unless associated with a secondary branch retinal vein occlusion (BRVO). **NEET-PG High-Yield Pearls:** * **Duration of Diabetes:** This is the single most important risk factor for the development of DR. * **Earliest Sign of DR:** Microaneurysms (located in the inner nuclear layer). * **First Clinically Detectable Sign:** Microaneurysms. * **PDR Hallmark:** Neovascularization (NVD/NVE) due to retinal ischemia (VEGF-mediated). * **Management:** Pan-retinal photocoagulation (PRP) is the gold standard for PDR to regress neovascularization.

Question 48: Which of the following investigations is contraindicated in retinoblastoma?

A. CT
B. USG
C. FNAC (Correct Answer)
D. MRI

Explanation: **Explanation:** **Why FNAC is Contraindicated:** Fine Needle Aspiration Cytology (FNAC) is strictly contraindicated in cases of suspected Retinoblastoma due to the high risk of **extraocular seeding**. Retinoblastoma is a highly malignant intraocular tumor; breaching the globe with a needle can track tumor cells along the needle path, leading to orbital dissemination and transforming a localized intraocular disease into a systemic, life-threatening one. Diagnosis is primarily clinical and radiological. **Analysis of Other Options:** * **CT Scan (A):** Highly useful for detecting **intraocular calcification** (pathognomonic "chalky white" appearance), though it carries a risk of radiation-induced secondary malignancies in patients with the *RB1* germline mutation. * **USG (B):** A non-invasive, first-line tool used to confirm the presence of a mass and detect calcification (seen as high-echo spikes with posterior shadowing). * **MRI (C):** The **investigation of choice** for evaluating optic nerve involvement, extraocular extension, and screening for "Trilateral Retinoblastoma" (associated pinealoblastoma). It avoids ionizing radiation. **Clinical Pearls for NEET-PG:** * **Most common** intraocular tumor of childhood. * **Most common presentation:** Leukocoria (white pupillary reflex), followed by strabismus. * **Pathology:** Flexner-Wintersteiner rosettes (highly specific) and Homer-Wright rosettes. * **Genetics:** Mutation in the *RB1* gene on chromosome **13q14**. * **Calcification:** Present in 90% of cases; its absence should make one reconsider the diagnosis.

Question 49: Blind spot enlargement indicates:

A. Retinal detachment
B. Avulsion of optic nerve
C. Papilloedema (Correct Answer)
D. Papillitis

Explanation: ### Explanation **Correct Answer: C. Papilloedema** **Mechanism:** The physiological blind spot (Mariotte's spot) corresponds to the **optic nerve head**, where there are no photoreceptors. In **papilloedema** (passive disc swelling due to increased intracranial pressure), the optic disc undergoes edema and expansion. This swelling causes the surrounding peripapillary retina to be pushed away and the sensory retina to be displaced or lifted (Paton’s folds). This physical enlargement of the non-receptive area results in a **centrifugal enlargement of the blind spot** on visual field testing (perimetry). **Why other options are incorrect:** * **Retinal Detachment (A):** Typically presents with a dense scotoma corresponding to the area of detachment or a "curtain-like" loss of vision, rather than isolated blind spot enlargement. * **Avulsion of Optic Nerve (B):** This is a traumatic event leading to immediate, profound vision loss and a total or massive field defect, not a localized enlargement of the blind spot. * **Papillitis (D):** This is primary inflammation of the optic disc (optic neuritis). Unlike papilloedema, the hallmark of papillitis is a **central or centrocecal scotoma** with a significant, early decrease in visual acuity and color vision. **High-Yield Clinical Pearls for NEET-PG:** * **Papilloedema vs. Papillitis:** In early papilloedema, visual acuity is usually **preserved**, whereas in papillitis, visual acuity is **severely diminished**. * **Foster Kennedy Syndrome:** Characterized by optic atrophy in one eye (due to direct compression by a tumor) and papilloedema in the other (due to increased ICP). * **Visual Field in Glaucoma:** Remember that glaucoma causes arcuate scotomas (Bjerrum’s scotoma) and nasal steps, not simple blind spot enlargement. * **Paton’s Lines:** Circumferential retinal folds seen in chronic papilloedema.

Question 50: Which of the following are risk factors for retinal detachment?

A. Diabetic retinopathy (Correct Answer)
B. Myopia
C. Hypermetropia
D. Central Retinal Vein Occlusion (CRVO)

Explanation: **Explanation:** Retinal detachment (RD) is classified into three types: Rhegmatogenous, Tractional, and Exudative. **Diabetic Retinopathy (Option A)** is a major risk factor for **Tractional Retinal Detachment (TRD)**. In the proliferative stage (PDR), chronic ischemia leads to neovascularization. These new vessels are accompanied by fibrous tissue growth. Over time, this fibrovascular membrane contracts, pulling the neurosensory retina away from the underlying retinal pigment epithelium (RPE). This is a classic high-yield association for NEET-PG. **Analysis of Incorrect Options:** * **Myopia (Option B):** While **High Myopia** is a significant risk factor for *Rhegmatogenous* RD (due to peripheral retinal degenerations like Lattice degeneration), it is not the primary mechanism associated with the systemic pathology often tested alongside diabetic complications in this specific context. However, in many clinical scenarios, Myopia is a correct risk factor; here, the question emphasizes the systemic-to-ocular link. * **Hypermetropia (Option C):** This is generally considered "protective" against RD because the eyeball is shorter and the retina is less stretched compared to myopic eyes. * **CRVO (Option D):** While CRVO can lead to macular edema or neovascular glaucoma, it is not a direct primary risk factor for retinal detachment in the same way that the fibrovascular proliferation of Diabetes is. **Clinical Pearls for NEET-PG:** * **Most common type of RD:** Rhegmatogenous (associated with Myopia and trauma). * **Tractional RD:** Characterized by a "tent-like" configuration and lack of mobility; it does *not* show shifting fluid. * **Exudative RD:** Associated with "shifting fluid" and seen in conditions like Vogt-Koyanagi-Harada (VKH) syndrome or posterior scleritis.

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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