Diseases of the Retina Practice Questions

Q: Tubular vision is seen in which condition?

Retinitis pigmentosa. **Explanation:** **Tubular vision** (also known as tunnel vision) refers to the loss of peripheral vision with the retention of only a small central field. 1. **Retinitis Pigmentosa (Correct):** This is a hereditary dystrophy primarily affecting the **rod photoreceptors** first. Since rods are concentrated in the mid-periphery of the retina, their degeneration leads to **ring scotomas**. As the disease progresses, these scotomas expand peripherally and centrally, leaving only a tiny island of central vision (macular sparing), resulting in the classic "tubular vision." 2. **Bread Crumb Cataract (Incorrect):** This refers to the characteristic appearance of a **complicated cataract** (secondary to intraocular inflammation like uveitis). While it causes blurred vision, it does not specifically cause tubular field loss. 3. **Balint Syndrome (Incorrect):** This is a triad of neuropsychological impairments (simultanagnosia, optic ataxia, and ocular apraxia) due to bilateral parieto-occipital lesions. While patients have difficulty perceiving the visual field as a whole, it is a cortical processing issue, not a retinal "tunnel" defect. 4. **Central Serous Retinopathy (CSR) (Incorrect):** CSR involves localized sensory retinal detachment at the macula. It typically causes **central scotoma**, micropsia, and metamorphopsia, rather than peripheral loss. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad of RP:** Bony spicule pigmentation, Arteriolar attenuation, and Waxy pallor of the optic disc. * **First Symptom of RP:** Nyctalopia (Night blindness). * **Other causes of Tubular Vision:** Advanced Glaucoma (end-stage), Chronic Papilledema, and Pan-retinal photocoagulation (PRP). * **ERG in RP:** Characteristically shows a "subnormal" or "extinguished" (flat) response even in early stages.

Q: Which of the following agents is NOT used in the treatment of Diabetic Macular Edema?

Tamoxifen. **Explanation:** The correct answer is **Tamoxifen**. In fact, Tamoxifen is known to **cause** maculopathy rather than treat it. Tamoxifen-induced maculopathy is characterized by bilateral, fine, glistening crystalline deposits in the inner retinal layers (paramacular area), which can lead to macular edema and decreased visual acuity. **Why the other options are incorrect (Agents used in DME management):** * **Ruboxistaurin:** This is a selective **Protein Kinase C (PKC-beta) inhibitor**. Hyperglycemia activates the PKC pathway, leading to increased vascular permeability and VEGF expression. Ruboxistaurin aims to block this pathway to reduce macular edema. * **Pyridazinones:** These act as **Aldose Reductase Inhibitors (ARIs)**. They inhibit the polyol pathway, preventing the accumulation of sorbitol, which causes osmotic stress and microvascular damage in the diabetic retina. * **Benfotiamine:** A lipid-soluble derivative of Thiamine (Vitamin B1). It inhibits three major pathways of hyperglycemic damage: the hexosamine pathway, the advanced glycation end-product (AGE) pathway, and the PKC pathway by activating the enzyme **transketolase**. **High-Yield Clinical Pearls for NEET-PG:** * **First-line treatment for DME:** Intravitreal Anti-VEGF agents (e.g., Ranibizumab, Aflibercept). * **Tamoxifen Toxicity:** Look for "crystalline maculopathy" in the history of a patient being treated for breast cancer. * **Other drugs causing Crystalline Maculopathy:** Canthaxanthin (tanning pills), Talc (IV drug abuse), and Methoxyflurane. * **Steroids in DME:** Intravitreal implants (Dexamethasone/Ozurdex) are used, especially in pseudophakic eyes or those refractory to Anti-VEGF.

Q: What is true regarding metamorphopsia?

It is associated with diseases affecting the macula.. **Explanation:** **Metamorphopsia** is a type of visual distortion where straight lines appear wavy, bent, or crooked. 1. **Why Option B is Correct:** The underlying mechanism involves the physical displacement or distortion of the **photoreceptors** (rods and cones) within the **macula**. When the macular architecture is altered—due to fluid (edema), subretinal neovascular membranes, or traction—the brain receives a spatially distorted image. Since the macula is responsible for central, high-resolution vision, any pathology here (e.g., Central Serous Chorioretinopathy, Age-related Macular Degeneration, or Macular Hole) typically manifests as metamorphopsia. 2. **Why Other Options are Incorrect:** * **Option A:** While it can occur in age-related conditions (like ARMD), it is a **pathological sign**, not a normal physiological age-related change (like presbyopia). * **Option C:** Excessive light causes "dazzle" or photophobia, not spatial distortion. * **Option D:** "Flashes" of light are known as **photopsia**, which usually indicates vitreoretinal traction (common in retinal detachment or posterior vitreous detachment), not macular distortion. **High-Yield Clinical Pearls for NEET-PG:** * **Amsler Grid:** The gold standard bedside clinical test used to detect and monitor metamorphopsia. * **Micropsia vs. Macropsia:** If photoreceptors are pushed apart (e.g., by edema), the image appears smaller (**Micropsia**). If they are crowded together (e.g., by a healing scar), the image appears larger (**Macropsia**). * **Watzke-Allen Sign:** A specific clinical test using a slit-lamp beam to confirm a full-thickness macular hole (the patient sees a break in the beam).

Q: What is the most common etiology of recurrent vitreous hemorrhage in a young patient?

Eales disease. **Explanation:** **Eales disease** is the most common cause of recurrent vitreous hemorrhage in young adults (typically males aged 20–40) in the Indian subcontinent. It is an idiopathic, inflammatory peripheral retinal perivasculitis (primarily affecting venules). The disease progresses through three stages: perivascular sheathing, peripheral retinal ischemia/non-perfusion, and finally, **neovascularization**. These fragile new vessels (usually at the junction of perfused and non-perfused retina) bleed easily into the vitreous, leading to sudden, painless vision loss. Its association with hypersensitivity to tuberculoprotein is a frequently tested high-yield point. **Why other options are incorrect:** * **Trauma:** While a common cause of a *single* episode of vitreous hemorrhage, it is less likely to cause spontaneous *recurrent* episodes unless associated with a specific structural complication like a retinal tear. * **Peripheral detachment of retina:** Retinal detachment (RD) usually presents with flashes (photopsia) and floaters. While a retinal tear can cause hemorrhage, the RD itself is a consequence or a co-finding, not the primary etiology for recurrent bleeding in this demographic. * **Central Retinal Artery Occlusion (CRAO):** This presents with sudden, profound, painless loss of vision and a "cherry-red spot." It is an ischemic event, not a hemorrhagic one, and is rare in young patients. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad of Eales:** Perivasculitis (sheathing), peripheral non-perfusion, and neovascularization/vitreous hemorrhage. * **Treatment:** Peripheral scatter laser photocoagulation (to ablate ischemic areas) and occasionally anti-VEGF injections or vitrectomy. * **Differential:** Always rule out Tuberculosis and Sarcoidosis in suspected Eales cases. * **Most common cause of VH in elderly:** Proliferative Diabetic Retinopathy (PDR).

Q: 'Bull's eye' lesion in the macular region is seen in which of the following conditions?

Both progressive cone dystrophy and chloroquine maculopathy. **Explanation:** A **'Bull's eye' maculopathy** is a classic clinical sign characterized by a central island of pigmented foveal epithelium surrounded by a concentric ring of hypopigmentation (due to RPE atrophy), which is further encircled by a ring of normal pigmentation. **Why Option C is Correct:** The lesion is not pathognomonic for a single disease but is a shared feature of several retinal conditions: 1. **Chloroquine/Hydroxychloroquine Maculopathy:** This is the most common toxic cause. The drug binds to melanin in the RPE, leading to localized atrophy in a circular pattern around the fovea. 2. **Progressive Cone Dystrophy:** This is the most common inherited cause. It presents with a gradual loss of color vision and central acuity, often manifesting the Bull's eye pattern during the atrophic stage. **Analysis of Other Options:** * **Options A & B:** While both conditions individually cause a Bull's eye lesion, selecting only one would be incomplete. In NEET-PG, when two valid causes are presented alongside a "Both" option, the combined option is the most accurate choice. **Clinical Pearls for NEET-PG:** * **Differential Diagnosis (Mnemonic: C-S-A-G-E):** * **C:** **C**hloroquine/Hydroxychloroquine toxicity. * **S:** **S**targardt’s disease (occasionally). * **A:** **A**ge-related macular degeneration (atrophic). * **G:** **G**lycosidosis (certain metabolic storage diseases). * **E:** **E**pinal (Cone) dystrophy. * **Screening:** For patients on Hydroxychloroquine, the **10-2 Visual Field test** and **SD-OCT** (showing the "Flying Saucer" sign) are the current gold standards for early detection before the Bull's eye becomes visible on fundoscopy. * **Prognosis:** Once the Bull's eye lesion is visible clinically, the damage is usually irreversible, even if the offending drug is discontinued.

Q: When should screening for Diabetic Retinopathy be initiated after the diagnosis of diabetes?

Type 2 DM: Immediately. ### Explanation The timing of screening for Diabetic Retinopathy (DR) is based on the likely duration of hyperglycemia prior to clinical diagnosis. **1. Why "Type 2 DM: Immediately" is correct:** In Type 2 Diabetes Mellitus (T2DM), the onset of hyperglycemia is often insidious and asymptomatic. Patients may have had undiagnosed diabetes for several years before a clinical diagnosis is made. Consequently, approximately **20% of T2DM patients** already have some degree of retinopathy at the time of diagnosis. Therefore, screening must be performed **immediately (at the time of diagnosis)** to detect existing microvascular damage. **2. Why the other options are incorrect:** * **Options B & C (Within 6 months/1 year):** Waiting for 6 months or a year is unsafe for T2DM patients, as sight-threatening proliferative changes or macular edema could progress during this delay. * **Option D (Type 1 DM: Within one week):** This is incorrect because Type 1 DM has an acute onset. Retinopathy rarely develops within the first few years of the disease. Screening for Type 1 DM is typically initiated **5 years after diagnosis** (or at puberty). **3. Clinical Pearls for NEET-PG:** * **Follow-up Frequency:** If no retinopathy is found, screening is generally repeated **annually**. * **Pregnancy:** Diabetic women who become pregnant should have an eye exam in the **first trimester** and be monitored closely throughout pregnancy, as DR can progress rapidly. (Note: This does not apply to Gestational Diabetes). * **First Sign of DR:** The earliest clinical sign is **Microaneurysms** (found in the Inner Nuclear Layer). * **Earliest Pathological Change:** Loss of **pericytes** and basement membrane thickening. * **Screening Tool:** The gold standard for screening is **7-standard field stereoscopic fundus photography**.

Q: Exudative retinal detachment occurs in which of the following conditions?

Pregnancy induced hypertension. **Explanation:** **Exudative (Serous) Retinal Detachment (RD)** occurs when fluid accumulates in the subretinal space between the neurosensory retina and the retinal pigment epithelium (RPE) without any retinal break or traction. **Why Pregnancy-Induced Hypertension (PIH) is correct:** In severe PIH or Eclampsia, the primary pathology is **systemic vasospasm**. This leads to intense vasoconstriction of the choroidal arterioles, causing choroidal ischemia and subsequent damage to the RPE. When the RPE (the blood-retinal barrier) is compromised, fluid leaks from the choriocapillaris into the subretinal space, resulting in an exudative RD. This is typically bilateral and usually resolves spontaneously once blood pressure is controlled postpartum. **Why the other options are incorrect:** * **Myopia:** High myopia is strongly associated with **Rhegmatogenous RD**, caused by peripheral retinal degenerations (like lattice degeneration) leading to retinal holes or tears. * **Diabetes Mellitus:** Proliferative Diabetic Retinopathy (PDR) leads to fibrovascular proliferation. The contraction of these membranes causes **Tractional RD**. * **Trauma:** Ocular trauma most commonly causes **Rhegmatogenous RD** (via retinal dialyses or tears) or occasionally tractional RD due to vitreous hemorrhage and scarring. **High-Yield Clinical Pearls for NEET-PG:** * **Rhegmatogenous RD:** Most common type; characterized by a "break" (hole/tear) and "Shifting Fluid" is **absent**. * **Exudative RD:** Key feature is **Shifting Fluid** (fluid moves with gravity). Other causes include Vogt-Koyanagi-Harada (VKH) syndrome, posterior scleritis, and choroidal tumors. * **Tractional RD:** Characterized by a "concave" configuration and restricted mobility; "Shifting Fluid" is **absent**.

Q: What is the parasitic cause of uveitis?

Toxocara. **Explanation:** **Toxocara canis** (and less commonly *T. cati*) is a major parasitic cause of posterior uveitis, typically manifesting as **Ocular Larva Migrans (OLM)**. The infection occurs through the ingestion of soil or food contaminated with eggs from dog or cat feces. Once the larvae hatch in the human intestine, they migrate through the circulatory system to the eye. The hallmark clinical presentation is a **solidary eosinophilic granuloma**, usually located in the macula or peripheral retina, which can lead to tractional retinal detachment and endophthalmitis. **Analysis of Options:** * **Amoebiasis (Entamoeba histolytica):** Primarily causes intestinal disease and liver abscesses. While it can rarely cause a necrotizing pigmentary retinopathy, it is not a classic or common cause of uveitis. * **Taenia solium:** This parasite causes **Cysticercosis**. In the eye, the larvae (Cysticercus cellulosae) typically lodge in the subretinal space or vitreous as a visible cyst. While it causes inflammation, it is classified as an intraocular parasite rather than a primary cause of uveitis syndromes. * **Onchocerca volvulus:** This causes "River Blindness." While it leads to severe ocular morbidity (sclerosing keratitis and chorioretinitis), **Toxocara** is the more classic answer for parasitic uveitis in a general systemic context for NEET-PG. **High-Yield Clinical Pearls:** * **Toxocariasis** often presents unilaterally in children with leukocoria (white pupillary reflex), making it a key differential diagnosis for **Retinoblastoma**. * **Toxoplasmosis** (Protozoa) is actually the *most common* cause of posterior uveitis worldwide, but among the helminthic parasites listed, **Toxocara** is the primary culprit. * Diagnosis is usually clinical and supported by **ELISA** for anti-Toxocara antibodies. Steroids are the mainstay of treatment to control inflammation.

Q: The fundus photograph shown is characteristic of which of the following conditions?

Best disease. ***Best disease*** - Characterized by the pathognomonic **"egg-yolk" vitelliform macular lesion** that appears as a bright yellow, round deposit in the **macula**. - Associated with mutations in the **BEST1 gene** and shows characteristic **reduced Arden ratio** on electrooculography (EOG). *Stargardt disease* - Presents with **pisciform (fish-shaped) flecks** throughout the posterior pole, not a single egg-yolk lesion. - Caused by **ABCA4 gene mutations** and shows **dark choroid sign** on fluorescein angiography due to lipofuscin accumulation. *Fundus flavimaculatus* - Features multiple **yellow-white flecks** scattered across the fundus, similar to Stargardt disease pattern. - Also caused by **ABCA4 mutations** and lacks the characteristic single vitelliform lesion of Best disease. *Stickler syndrome* - A **connective tissue disorder** that may cause retinal detachment and vitreoretinal degeneration. - Does **not produce characteristic macular lesions** and is associated with systemic features like cleft palate and joint hypermobility.

Question 1

Tubular vision is seen in which condition?

Accepted Answer

Retinitis pigmentosa

Answer

Bread crumb cataract

Answer

Balint syndrome

Answer

Central serous retinopathy

Question 2

A 47-year-old woman presents with accelerated hypertension (blood pressure 210/105 mm Hg) and frequent headaches for the past month. She has a past medical history notable for hypertension during her first pregnancy, and her family history is positive for hypertension in both parents and a brother. On physical examination, her blood pressure is 210/105 mm Hg in both arms, heart rate is 88/min, and she is alert and oriented. Cardiac examination reveals an S4, lungs are clear, and there are no focal neurological deficits. Which of the following findings are most likely on examination of the fundi?

Accepted Answer

Cotton wool spots

Answer

Retinitis obliterans

Answer

Retinal detachment

Answer

Optic atrophy

Question 3

Which of the following agents is NOT used in the treatment of Diabetic Macular Edema?

Accepted Answer

Tamoxifen

Answer

Ruboxistaurin

Answer

Pyridazinones

Answer

Benfotiamine

Question 4

What is true regarding metamorphopsia?

Accepted Answer

It is associated with diseases affecting the macula.

Answer

It is an age-related change.

Answer

It occurs when too much light shines into the eyes.

Answer

It is interpreted by the brain as 'flashes'.

Question 5

What is the most common etiology of recurrent vitreous hemorrhage in a young patient?

Accepted Answer

Eales disease

Answer

Trauma

Answer

Peripheral detachment of retina

Answer

Central retinal artery occlusion

Question 6

'Bull's eye' lesion in the macular region is seen in which of the following conditions?

Accepted Answer

Both progressive cone dystrophy and chloroquine maculopathy

Answer

Progressive cone dystrophy

Answer

Chloroquine maculopathy

Answer

None of the above

Question 7

When should screening for Diabetic Retinopathy be initiated after the diagnosis of diabetes?

Accepted Answer

Type 2 DM: Immediately

Answer

Type 2 DM: Within 6 months

Answer

Type 2 DM: Within 1 year

Answer

Type 1 DM: Within one week

Question 8

Exudative retinal detachment occurs in which of the following conditions?

Accepted Answer

Pregnancy induced hypertension

Answer

Myopia

Answer

Diabetes mellitus

Answer

Trauma

Question 9

What is the parasitic cause of uveitis?

Accepted Answer

Toxocara

Answer

Amoebiasis

Answer

Taenia solium

Answer

Onchocerca volvulus

Question 10

The fundus photograph shown is characteristic of which of the following conditions?

Accepted Answer

Best disease

Answer

Stargardt disease

Answer

Fundus flavimaculatus

Answer

Stickler syndrome

Diseases of the Retina — MCQs

Diseases of the Retina — MCQs

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