Diseases of the Retina — MCQs

A 30-year-old male presents with a 15-day history of unilateral blurred vision and floaters. Examination reveals anterior chamber flare and cells, and a 'headlight in fog' appearance on indirect ophthalmoscopy. A single inflammatory focus of fluffy retinochoroiditis is also observed. What is the diagnosis?

Q406Medium

In patients with anterior uveitis, decrease in vision due to posterior segment involvement can occur because of which of the following?

Q407Easy

Diabetic retinopathy is essentially an angiopathy affecting which retinal structures?

Q408Medium

Sauce and cheese retinopathy is seen in:

Q409Medium

Treatment of advanced proliferative diabetic retinopathy with extensive vitreoretinal fibrosis and fractional retinal detachment involves all of the following, EXCEPT:

Q410Easy

CMV retinitis in HIV occurs when the CD4 counts fall below which of the following levels?

Diseases of the Retina Indian Medical PG Practice Questions and MCQs

Question 401: Tomato ketchup retina is seen in which condition?

A. Central retinal artery occlusion
B. Central retinal vein occlusion (Correct Answer)
C. Coats disease
D. Sickle cell retinopathy

Explanation: **Explanation:** **Central Retinal Vein Occlusion (CRVO)**, specifically the non-ischemic and ischemic types, is characterized by the classic **"Tomato Ketchup"** or **"Blood and Thunder"** appearance. This occurs because an obstruction in the central retinal vein (usually at the level of the lamina cribrosa) leads to a sudden backup of blood. The resulting increased intraluminal pressure causes widespread superficial and deep retinal hemorrhages, dilated and tortuous veins, and optic disc edema, resembling splashed ketchup across the fundus. **Analysis of Incorrect Options:** * **Central Retinal Artery Occlusion (CRAO):** Characterized by a **"Cherry Red Spot"** on a pale, milky-white edematous retina due to the cessation of blood flow. * **Coats Disease:** An idiopathic condition featuring telangiectatic retinal vessels and massive **subretinal exudates** (hard exudates), often described as a "light bulb" appearance on imaging, but not "tomato ketchup." * **Sickle Cell Retinopathy:** Associated with peripheral neovascularization known as **"Sea-fan retinopathy."** While it can cause vitreous hemorrhage, it does not present with the diffuse hemorrhagic pattern of CRVO. **Clinical Pearls for NEET-PG:** * **Risk Factors:** Hypertension (most common), Diabetes Mellitus, and Primary Open Angle Glaucoma (POAG). * **Ischemic vs. Non-ischemic:** Ischemic CRVO is defined by >10 disc areas of capillary non-perfusion on Fluorescein Angiography (FFA) and carries a high risk of **Neovascular Glaucoma (100-day glaucoma)**. * **Management:** Intravitreal Anti-VEGF (e.g., Ranibizumab) or steroids are first-line for macular edema; Pan-retinal photocoagulation (PRP) is indicated if neovascularization develops.

Question 402: 'Bull's eye' maculopathy can be caused by which of the following drugs?

A. Quinine
B. Chloroquine (Correct Answer)
C. Amiodarone
D. Digoxin

Explanation: **Explanation:** **Bull’s eye maculopathy** is a classic clinical finding characterized by a central ring of pigment epithelial atrophy surrounding a preserved central foveal area, giving it a target-like appearance on fundoscopy. **1. Why Chloroquine is Correct:** Chloroquine and its derivative, Hydroxychloroquine, have a high affinity for **melanin** in the Retinal Pigment Epithelium (RPE). The drug binds to melanin, leading to RPE dysfunction and subsequent degeneration of the overlying photoreceptors. The "Bull's eye" pattern occurs because the foveolar RPE is initially spared or affected differently than the parafoveal RPE. On Fluorescein Angiography (FFA), this appears as a "window defect." **2. Analysis of Incorrect Options:** * **Quinine:** Toxicity typically presents with acute vision loss, marked arteriolar narrowing ("thread-like" vessels), and optic atrophy, but not a Bull's eye pattern. * **Amiodarone:** Primarily causes **Vortex Keratopathy** (Cornea Verticillata)—fine, whorl-like deposits in the corneal epithelium. It can also cause optic neuropathy, but not maculopathy. * **Digoxin:** Causes "Xanthopsia" (yellow-tinted vision) and snowy vision due to its effect on cone photoreceptors, but it does not cause structural macular pigmentary changes. **3. High-Yield Clinical Pearls for NEET-PG:** * **Differential Diagnosis for Bull's Eye Maculopathy:** Remember the mnemonic **"CHAMP"**: **C**hloroquine, **H**alothane (rare), **A**mstar/Stargardt’s disease, **M**acular dystrophy (Cone-rod), **P**eripherin/Batten's disease. * **Screening:** The most sensitive tests for early detection of Chloroquine toxicity are **Visual Fields (10-2)** and **Spectral Domain OCT** (showing the "Flying Saucer" sign). * **Dosage Risk:** Toxicity is high if the cumulative dose of Chloroquine exceeds 300g or Hydroxychloroquine exceeds 5mg/kg/day.

Question 403: Which of the following is NOT a feature of retinal detachment?

A. Field defect
B. Retinal tears
C. Anterior uveitis with vitreous hemorrhage (Correct Answer)
D. Greyish-brown fundus

Explanation: **Explanation:** Retinal Detachment (RD), specifically the rhegmatogenous type, occurs when a break in the retina allows fluid to enter the subretinal space, separating the neurosensory retina from the underlying retinal pigment epithelium (RPE). **Why Option C is the correct answer:** While **vitreous hemorrhage** can be associated with retinal tears (due to the rupture of a peripheral vessel), **Anterior Uveitis** is not a standard feature of RD. In fact, RD is typically associated with **low intraocular pressure (hypotony)** and a quiet anterior chamber. If inflammation is present, it is usually mild (Schwartz-Matsuo syndrome). The combination of anterior uveitis and vitreous hemorrhage points more toward inflammatory conditions or trauma rather than a primary RD. **Analysis of incorrect options:** * **A. Field defect:** Patients frequently complain of a "curtain falling" over their vision. The location of the visual field defect is always **opposite** to the site of the detachment. * **B. Retinal tears:** These are the primary cause of Rhegmatogenous RD. Traction from the vitreous (PVD) leads to tears or holes, allowing liquefied vitreous to seep under the retina. * **D. Greyish-brown fundus:** On ophthalmoscopy, the detached retina loses its transparency and appears **pearly grey, opaque, and wrinkled**. It undulates with eye movements. **High-Yield Clinical Pearls for NEET-PG:** * **Shafer’s Sign:** The presence of "tobacco dust" (pigment cells) in the anterior vitreous is pathognomonic for a retinal tear. * **Symptoms:** Photopsia (flashes), floaters, and sudden painless field loss. * **Management:** The gold standard is surgery (Scleral buckling, Pneumatic retinopexy, or Pars Plana Vitrectomy) to seal the break.

Question 404: A 35-year-old patient with Insulin Dependent Diabetes Mellitus (IDDM), on insulin for the past 10 years, complains of gradually progressive painless loss of vision. What is the most likely diagnosis?

A. Cataract (Correct Answer)
B. Vitreous haemorrhage
C. Total rhegmatogenous retinal detachment
D. Tractional retinal detachment not involving the macula

Explanation: **Explanation:** The correct answer is **Cataract**. In a patient with long-standing Diabetes Mellitus (10 years), the most common cause of **gradually progressive, painless loss of vision** is a cataract. Diabetics are prone to both senile cataracts (occurring at an earlier age) and the classic "Snowflake cataract" (true diabetic cataract). While diabetic retinopathy is a major concern, the clinical presentation of "gradual and painless" vision loss in this demographic most frequently points to lenticular changes. **Why other options are incorrect:** * **Vitreous Haemorrhage:** Typically presents as a **sudden**, painless loss of vision, often preceded by floaters or "cobwebs." It is a complication of Proliferative Diabetic Retinopathy (PDR). * **Total Rhegmatogenous Retinal Detachment (RRD):** Usually presents with a sudden onset of flashes (photopsia), floaters, and a "curtain-like" field defect. It is not the primary association with diabetic eye disease. * **Tractional Retinal Detachment (TRD):** While common in PDR due to fibrovascular membranes, a TRD **not involving the macula** would typically be asymptomatic or cause peripheral field loss, rather than a generalized progressive loss of central vision. **Clinical Pearls for NEET-PG:** * **True Diabetic Cataract:** Characterized by subcapsular "Snowflake" opacities; it occurs due to the accumulation of **sorbitol** via the polyol pathway, leading to osmotic swelling of the lens. * **Most common cause of legal blindness in Diabetics:** Diabetic Macular Edema (DME). * **Sudden painless vision loss in Diabetes:** Think Vitreous Haemorrhage or Central Retinal Vein Occlusion (CRVO). * **Gradual painless vision loss in Diabetes:** Think Cataract or Diabetic Maculopathy.

Question 405: A 30-year-old male presents with a 15-day history of unilateral blurred vision and floaters. Examination reveals anterior chamber flare and cells, and a 'headlight in fog' appearance on indirect ophthalmoscopy. A single inflammatory focus of fluffy retinochoroiditis is also observed. What is the diagnosis?

A. Cytomegalovirus retinitis
B. Toxoplasmosis chorioretinitis (Correct Answer)
C. Toxocariasis
D. Sarcoidosis

Explanation: **Explanation:** The clinical presentation is classic for **Ocular Toxoplasmosis**, the most common cause of posterior uveitis worldwide. **1. Why Toxoplasmosis is Correct:** The hallmark sign described, **'Headlight in fog'**, refers to an active focus of fluffy, white-yellow **necrotizing retinochoroiditis** seen through a dense vitreous inflammatory haze (vitritis). In a 30-year-old, this is often a recurrence of congenital infection. The presence of anterior chamber flare and cells (iridocyclitis) is a common "neighbor reaction" to the posterior segment inflammation. **2. Why Other Options are Incorrect:** * **CMV Retinitis:** Typically occurs in immunocompromised patients (CD4 <50). It presents with minimal vitritis (no "fog") and a "pizza-pie" or "crushed tomato" appearance (hemorrhage and necrosis), not a single fluffy focus. * **Toxocariasis:** Usually presents in children as a solitary white elevated granuloma (macular or peripheral) or endophthalmitis, but lacks the characteristic recurrent retinochoroiditis pattern. * **Sarcoidosis:** Characterized by "mutton-fat" KPs, "string of pearls" vitreous opacities, and "candle-wax drippings" (periphlebitis), rather than a focal necrotizing retinitis. **Clinical Pearls for NEET-PG:** * **Primary site of infection:** The **retina** is the primary site (Toxoplasma is an obligate intracellular parasite); the choroid is involved secondarily. * **Classic Lesion:** An active lesion often appears adjacent to an old, pigmented **"punched-out" chorioretinal scar** (Satellite lesion). * **Treatment:** The "Triple Therapy" includes Pyrimethamine, Sulfadiazine, and Folinic acid. Steroids are added *only after* starting anti-parasitics to reduce inflammation.

Question 406: In patients with anterior uveitis, decrease in vision due to posterior segment involvement can occur because of which of the following?

A. Visual floaters
B. Inflammatory disc edema
C. Exudative retinal detachment
D. Cystoid macular edema (CME) (Correct Answer)

Explanation: **Explanation:** The most common cause of significant visual loss in patients with chronic or severe **Anterior Uveitis** (iridocyclitis) due to posterior segment involvement is **Cystoid Macular Edema (CME)**. **1. Why Cystoid Macular Edema (CME) is correct:** In anterior uveitis, inflammatory mediators (prostaglandins, cytokines) diffuse posteriorly through the vitreous to the macula. This leads to a breakdown of the blood-retinal barrier, causing fluid accumulation in the outer plexiform (Henle’s) and inner nuclear layers of the retina. This fluid forms "cyst-like" spaces, leading to a significant drop in central visual acuity. **2. Analysis of Incorrect Options:** * **Visual Floaters (A):** While common in uveitis due to vitritis (inflammatory cells in the vitreous), they cause "spots" in vision rather than a primary decrease in central visual acuity. * **Inflammatory Disc Edema (B):** This can occur in severe cases (Papillitis), but it is much less frequent than CME as a cause of vision loss in anterior uveitis. * **Exudative Retinal Detachment (C):** This is typically associated with **Posterior Uveitis** (e.g., VKH syndrome or Sympathetic Ophthalmia) rather than simple anterior uveitis. **3. High-Yield Clinical Pearls for NEET-PG:** * **Irvine-Gass Syndrome:** CME occurring specifically after cataract surgery. * **Diagnosis:** **Optical Coherence Tomography (OCT)** is the gold standard for diagnosis, showing a "honeycomb" appearance. **Fundus Fluorescein Angiography (FFA)** shows a characteristic **"Flower-petal" appearance**. * **Management:** First-line treatment involves topical NSAIDs and corticosteroids. Carbonic anhydrase inhibitors (Acetazolamide) are also used to reduce macular edema. * **Other complications of Anterior Uveitis:** Complicated cataract (Bread-crumb appearance) and Secondary Glaucoma.

Question 407: Diabetic retinopathy is essentially an angiopathy affecting which retinal structures?

A. Precapillary arterioles
B. Capillaries
C. Venules
D. All of the above (Correct Answer)

Explanation: **Explanation:** Diabetic Retinopathy (DR) is a chronic microangiopathy characterized by structural and functional changes in the retinal microvasculature. The correct answer is **All of the above** because the disease process involves the entire microcirculatory unit of the retina. 1. **Why "All of the above" is correct:** Hyperglycemia leads to biochemical changes (polyol pathway, AGE accumulation, and PKC activation) that damage the vascular endothelium and cause the loss of intramural pericytes. This damage is not localized to a single vessel type: * **Precapillary arterioles:** Experience basement membrane thickening and endothelial damage, leading to occlusions and the formation of "Cotton Wool Spots" (nerve fiber layer infarcts). * **Capillaries:** These are the primary site of microaneurysms (the earliest clinical sign) and capillary non-perfusion. * **Venules:** Show signs of venous stasis, such as "venous beading," looping, and dilation, which are critical indicators of progressing ischemia. 2. **Why individual options are incomplete:** While capillaries are often the most discussed in the context of microaneurysms, focusing solely on them (Option B) or the arterioles (Option A) ignores the systemic nature of the angiopathy. The clinical grading of DR (e.g., the 4-2-1 rule) specifically relies on identifying pathology in all three components. **High-Yield Clinical Pearls for NEET-PG:** * **Earliest Clinical Sign:** Microaneurysms (found in the inner nuclear layer). * **Earliest Pathological Change:** Loss of pericytes and basement membrane thickening. * **Cotton Wool Spots:** Represent focal ischemia of the retinal nerve fiber layer (RNFL). * **IRMA (Intraretinal Microvascular Abnormalities):** Shunts between arterioles and venules that bypass capillary beds; they are a hallmark of Severe NPDR. * **VEGF:** The key mediator driving Neovascularization (PDR) and Macular Edema.

Question 408: Sauce and cheese retinopathy is seen in:

A. Cytomegalovirus (CMV) (Correct Answer)
B. Rubella
C. Toxoplasmosis
D. Congenital Syphilis

Explanation: **Explanation:** **Cytomegalovirus (CMV) Retinitis** is the most common opportunistic ocular infection in patients with AIDS (typically when CD4 counts fall below 50 cells/µL). The classic ophthalmoscopic appearance is described as **"Sauce and Cheese"** or **"Pizza Pie" retinopathy**. This appearance is caused by a combination of dense, white retinal opacification (representing retinal necrosis and edema—the "cheese") and extensive flame-shaped intraretinal hemorrhages (the "sauce"). It typically follows a perivascular distribution and spreads centrifugally. **Analysis of Incorrect Options:** * **Rubella:** Characteristically presents with a **"Salt and Pepper" retinopathy**, which consists of mottled, fine pigmentary changes in the retinal pigment epithelium (RPE), usually without affecting vision. * **Toxoplasmosis:** Presents as a focal necrotizing retinochoroiditis. The classic description is a **"Headlight in the fog"** appearance, where a yellow-white active lesion is seen through a hazy vitreous caused by intense vitritis. * **Congenital Syphilis:** Also presents with a **"Salt and Pepper" fundus**, similar to Rubella, often accompanied by interstitial keratitis and Hutchinson’s teeth (Hutchinson’s triad). **Clinical Pearls for NEET-PG:** * **CMV Retinitis Treatment:** Intravenous Ganciclovir is the drug of choice. Foscarnet or Cidofovir are alternatives. * **Brush-fire border:** Another term for the advancing edge of CMV retinitis. * **Frosted Branch Angiitis:** A severe form of retinal vasculitis that can be seen in CMV infections. * **Immune Recovery Uveitis (IRU):** An inflammatory reaction seen in CMV patients after starting HAART as CD4 counts rise.

Question 409: Treatment of advanced proliferative diabetic retinopathy with extensive vitreoretinal fibrosis and fractional retinal detachment involves all of the following, EXCEPT:

A. Reattachment of detached or torn retina
B. Removal of epiretinal membrane
C. Vitrectomy
D. Exophotocoagulation (Correct Answer)

Explanation: **Explanation:** The management of **Advanced Proliferative Diabetic Retinopathy (PDR)** complicated by tractional retinal detachment (TRD) and extensive fibrosis is primarily **surgical**. **Why Option D is the Correct Answer:** **Exophotocoagulation** (external laser or cryotherapy applied to the sclera) is not the treatment of choice for advanced PDR with fibrosis. In cases of tractional retinal detachment, applying laser to the peripheral retina without relieving the underlying mechanical traction can actually worsen the detachment by causing further tissue shrinkage. The standard of care for PDR is **Pan-Retinal Photocoagulation (PRP)**, which is an *endophotocoagulation* or transpupillary procedure, but even this is secondary to surgery once extensive fibrosis and TRD have occurred. **Why the other options are incorrect:** * **Vitrectomy (C):** This is the definitive initial step. Pars Plana Vitrectomy (PPV) is required to clear vitreous hemorrhage and provide access to the retinal surface. * **Removal of epiretinal membrane (B):** Also known as "membranectomy" or "delamination/segmentation," this is crucial to release the anteroposterior and tangential traction caused by fibrovascular membranes that pull the retina away. * **Reattachment of detached retina (A):** The ultimate goal of the surgery is to settle the retina back onto the RPE. This often involves using internal tamponades like silicone oil or gas. **NEET-PG High-Yield Pearls:** 1. **Indications for Vitrectomy in PDR:** Non-clearing vitreous hemorrhage (>1 month), Tractional Retinal Detachment (TRD) involving the macula, and combined Tractional-Rhegmatogenous RD. 2. **TRD Characteristics:** Typically presents with a concave surface, is non-mobile, and does not show a shifting fluid sign (unlike exudative RD). 3. **Anti-VEGF Role:** Often injected 3–7 days *prior* to surgery to reduce the vascularity of membranes and minimize intraoperative bleeding.

Question 410: CMV retinitis in HIV occurs when the CD4 counts fall below which of the following levels?

A. 50 cells/µL (Correct Answer)
B. 100 cells/µL
C. 200 cells/µL
D. 150 cells/µL

Explanation: **Explanation:** Cytomegalovirus (CMV) retinitis is the most common opportunistic ocular infection in patients with AIDS. It is considered an **AIDS-defining illness** and typically manifests as a late-stage complication of HIV infection. **1. Why 50 cells/µL is correct:** The risk of CMV retinitis is inversely proportional to the CD4+ T-lymphocyte count. While it can rarely occur at higher levels, the vast majority of cases (over 90%) are seen when the **CD4 count falls below 50 cells/µL**. At this profound level of immunosuppression, the virus undergoes hematogenous spread to the retina, leading to full-thickness retinal necrosis. **2. Analysis of incorrect options:** * **100 cells/µL:** While patients are significantly immunocompromised at this level and at risk for infections like *Toxoplasmosis* or *Cryptococcosis*, CMV retinitis remains uncommon until the count drops further. * **200 cells/µL:** This is the threshold for defining AIDS. At this level, patients are primarily at risk for *Pneumocystis jirovecii* pneumonia (PCP). * **150 cells/µL:** This is an intermediate level where the risk for most viral opportunistic retinal infections is still relatively low. **3. High-Yield Clinical Pearls for NEET-PG:** * **Classic Appearance:** Described as **"Pizza-pie appearance"** or **"Cottage cheese with ketchup appearance"** (representing areas of white retinal necrosis mixed with flame-shaped hemorrhages). * **Symptoms:** Often presents with floaters, blurred vision, or scotomas; however, it can be asymptomatic if the peripheral retina is involved. * **Complication:** The most common cause of vision loss in these patients is **Rhegmatogenous Retinal Detachment**. * **Treatment:** Intravenous or intravitreal **Ganciclovir** is the drug of choice. Foscarnet and Cidofovir are alternatives. * **Immune Recovery Uveitis (IRU):** An inflammatory response that occurs when CD4 counts rise rapidly after starting HAART in a patient with pre-existing CMV retinitis.

Practice by Chapter

Retinal Anatomy and Physiology

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Age-Related Macular Degeneration

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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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