Diseases of the Retina Practice Questions

Q: A young patient presents with significant loss of central vision and a normal ERG. There is no obvious family history of similar presentation. What is the most likely diagnosis?

Stargardt's disease. **Explanation:** **Stargardt’s Disease** is the most common hereditary macular dystrophy. It typically presents in the first or second decade of life with progressive, bilateral, symmetrical loss of central vision. 1. **Why it is correct:** The hallmark of Stargardt’s is the **discrepancy between the significant loss of central vision and a normal Electroretinogram (ERG)** in the early stages. This occurs because the ERG measures the global response of the retina; since Stargardt’s primarily affects the macula (a small area), the overall retinal function remains preserved initially. An **Electro-oculogram (EOG)** is also typically normal. 2. **Why the others are wrong:** * **Best’s Disease:** While it affects central vision, it is characterized by a **normal ERG but a highly abnormal EOG** (Arden index <1.5). It also typically shows a "fried-egg" vitelliform lesion. * **Retinitis Pigmentosa:** This primarily affects peripheral vision (tunnel vision) and night blindness. The **ERG is characteristically extinguished** or markedly reduced early on. * **Cone-Rod Dystrophy:** This involves early loss of central vision, but unlike Stargardt’s, the **Photopic ERG is significantly abnormal** from the start as it reflects generalized cone dysfunction. **High-Yield Clinical Pearls for NEET-PG:** * **Genetics:** Most commonly Autosomal Recessive (ABCA4 gene mutation). * **Fundus Appearance:** "Pisciform" (fish-flesh) flecks and a "beaten bronze" macula. * **FFA Finding:** **"Dark Choroid"** (Silent Choroid) due to the accumulation of lipofuscin which masks underlying choroidal fluorescence—a classic exam favorite. * **OCT:** Shows atrophy of the outer retinal layers and RPE in the foveal region.

Q: What is the objective of the ETDRS study?

Effect of aspirin on the course of diabetic retinopathy. The **Early Treatment Diabetic Retinopathy Study (ETDRS)** is a landmark clinical trial in ophthalmology that established the current standards for managing diabetic retinopathy (DR). ### **Why Option A is Correct** One of the primary objectives of the ETDRS was to determine whether **650 mg of aspirin** daily could retard the progression of diabetic retinopathy or reduce the risk of vitreous hemorrhage. The study concluded that **aspirin does not affect the progression of DR**, nor does it increase the risk of retinal or vitreous hemorrhage. This is a high-yield fact because it confirms that diabetic patients can safely take aspirin for cardiovascular protection without ocular contraindications. ### **Analysis of Incorrect Options** * **Option B:** While the ETDRS did follow patients with various stages of DR, its primary focus was on the **timing of intervention** (early vs. deferred photocoagulation) rather than just observing visual outcomes over a fixed 2-year period. * **Option C:** This objective was primarily addressed by the **DRS (Diabetic Retinopathy Study)**, which proved that pan-retinal photocoagulation (PRP) reduces severe visual loss in Proliferative Diabetic Retinopathy (PDR). The ETDRS focused more on the timing of PRP and the benefit of focal laser for Macular Edema. ### **High-Yield Clinical Pearls for NEET-PG** * **Definition of CSME:** The ETDRS defined **Clinically Significant Macular Edema (CSME)** and established that focal/grid laser photocoagulation reduces the risk of moderate visual loss by 50%. * **Timing of PRP:** ETDRS recommended that PRP should be considered as eyes approach **High-Risk PDR** but is generally not indicated for mild to moderate Non-Proliferative Diabetic Retinopathy (NPDR). * **Classification:** The ETDRS classification of DR (based on the "Rule of 4-2-1") remains the gold standard for grading severity.

Q: A 25-year-old executive presents with metamorphopsia in his right eye. Fundus examination shows a shallow detachment at the macula. Fluorescein angiography reveals a 'smoke stack' sign. Which of the following management should be given?

Observation for spontaneous recovery. ### Explanation The clinical presentation of a young adult male (executive/stressed professional) with **metamorphopsia** (distorted vision), a **shallow macular detachment**, and the classic **'smoke stack' appearance** on Fluorescein Angiography (FA) is diagnostic of **Central Serous Chorioretinopathy (CSCR)**. **1. Why Observation is the Correct Management:** CSCR is typically a self-limiting condition. Approximately **80–90% of cases undergo spontaneous resolution** within 3 to 4 months without any active intervention. Therefore, the standard initial management is observation and lifestyle modification (stress reduction, discontinuing steroids). **2. Why Other Options are Incorrect:** * **Options B & C (Systemic/Pulse Corticosteroids):** These are **contraindicated**. Steroids (topical, systemic, or inhaled) are a known major risk factor for the development and exacerbation of CSCR. Administering steroids can worsen the detachment or lead to chronicity. * **Option A (Topical Antibiotic-Steroid):** There is no infectious component in CSCR, and the steroid component would be detrimental. **3. Clinical Pearls for NEET-PG:** * **Demographics:** Most common in young to middle-aged males with **Type A personalities**. * **FA Findings:** * **Ink-blot appearance** (most common). * **Smoke-stack appearance** (due to convection currents in the subretinal fluid). * **Optical Coherence Tomography (OCT):** Shows a characteristic "double-layer sign" or neurosensory detachment with increased choroidal thickness (**Pachychoroid**). * **Indications for Laser/PDT:** If the condition persists beyond 4 months, recurs frequently, or is required for occupational reasons (e.g., pilots), **Argon Laser Photocoagulation** (to the leak) or **Photodynamic Therapy (PDT)** is considered.

Q: What is the Gunn sign?

Tapering of veins on either side of the crossings. **Explanation:** The **Gunn sign** is a classic clinical finding in **Hypertensive Retinopathy**, specifically occurring during the **Grade 2 (Arteriovenous nipping)** stage of the Keith-Wagener-Barker classification. **Why the correct answer is right:** In hypertension, retinal arterioles undergo sclerosis and thickening of the adventitial layer. Since arterioles and venules share a common adventitial sheath at crossing points, the thickened arteriole compresses the underlying flexible vein. This compression causes the vein to appear narrow or invisible on either side of the crossing, a phenomenon known as **tapering of the veins**. **Analysis of Incorrect Options:** * **A & C (Silver and Copper wiring):** These refer to the increased light reflex from the arteriolar wall due to progressive sclerosis. Copper wiring occurs first (Grade 2); as sclerosis worsens, the vessel appears white/reflective, known as Silver wiring (Grade 3). * **B (Deflection of veins):** This describes **Salus’s sign**, where the vein is deflected at a right angle (Z-shaped or S-shaped) as it crosses the sclerosed arteriole. **High-Yield Clinical Pearls for NEET-PG:** * **Bonnet Sign:** Banking of the vein distal to the arteriovenous crossing. * **Hard Exudates in Macula:** Forms a characteristic **Macular Star** (Grade 4). * **Grade 4 Hypertensive Retinopathy:** Defined by the presence of **Papilledema** (optic disc swelling), which is a medical emergency. * **Elschnig Spots:** Small black spots surrounded by yellow/red halos, representing focal choroidal infarcts in severe hypertension.

Q: Argon laser is used in all except:

Retinitis pigmentosa. **Explanation:** The Argon laser (Blue-Green, 488–514 nm) works on the principle of **photocoagulation**. It is absorbed primarily by the pigment epithelium and hemoglobin, converting light energy into heat to create localized tissue destruction or "welding." **Why Retinitis Pigmentosa (RP) is the correct answer:** Retinitis Pigmentosa is a **hereditary rod-cone dystrophy** characterized by progressive degeneration of the photoreceptors. Since the pathology is a genetic cellular decay rather than a vascular or structural defect amenable to "burning," laser treatment has no therapeutic role. In fact, unnecessary photocoagulation could further damage the already compromised visual field. **Analysis of other options:** * **Retinal Detachment:** Argon laser is used for **prophylactic photocoagulation** to create chorioretinal adhesions around retinal breaks or holes, preventing fluid from entering the subretinal space. * **Retinal Vein Occlusion (RVO):** In ischemic CRVO or BRVO, laser is used to treat macular edema (Grid/Focal) or to perform **Pan-Retinal Photocoagulation (PRP)** to regress neovascularization. * **Eales' Disease:** This is an idiopathic peripheral perivasculitis. Laser is the mainstay of treatment to ablate peripheral areas of non-perfusion (ischemia) to prevent vitreous hemorrhage and tractional detachment. **High-Yield Clinical Pearls for NEET-PG:** * **Wavelength:** Argon Green (514 nm) is preferred over Blue to avoid absorption by xanthophyll in the macula. * **Primary Use:** PRP is the gold standard for **Proliferative Diabetic Retinopathy (PDR)**. * **RP Triad:** Bone-spicule pigmentation, arteriolar attenuation, and waxy disc pallor. * **Laser of choice for After-Cataract:** Nd:YAG laser (Photodisruption). * **Laser of choice for Glaucoma (PI):** Nd:YAG laser.

Q: Which of the following conditions is associated with cystoid macular edema?

Central Retinal Vein Occlusion. **Explanation:** **Cystoid Macular Edema (CME)** is the accumulation of fluid in the outer plexiform (Henle’s) and inner nuclear layers of the retina, forming characteristic fluid-filled cysts. **Why Option C is Correct:** **Central Retinal Vein Occlusion (CRVO)** is a classic cause of CME. The underlying mechanism involves venous stasis and increased intraluminal pressure, which leads to the breakdown of the **blood-retinal barrier**. This results in the leakage of fluid and plasma constituents into the extracellular space of the macula. On Fundus Fluorescein Angiography (FFA), this typically presents as a "flower-petal" appearance. **Analysis of Incorrect Options:** * **Option A (Ocular Analgesics):** There is no established clinical link between the overuse of topical analgesics and the development of CME. Overuse is more commonly associated with corneal epithelial toxicity or "ring" ulcers. * **Option B (Glaucoma):** While glaucoma itself does not cause CME, certain **prostaglandin analogues** (e.g., Latanoprost) used to treat glaucoma are known triggers for CME, especially in aphakic or pseudophakic eyes. * **Option D (Topical Steroids):** Steroids are actually used to **treat** CME by reducing inflammation and stabilizing the blood-retinal barrier. They do not cause it. **NEET-PG High-Yield Pearls:** * **Irvine-Gass Syndrome:** CME occurring after cataract surgery (peaks at 6–10 weeks). * **Drug-induced CME:** Epinephrine, Latanoprost, and Nicotinic acid. * **Gold Standard Diagnosis:** Optical Coherence Tomography (OCT) shows intraretinal cystic spaces. * **Mnemonic for CME Causes (DEPRIVED):** **D**iabetes, **E**pinephrine, **P**ars planitis, **R**etinitis pigmentosa, **I**rvine-Gass, **V**ein occlusion (CRVO), **E**2 (Prostaglandins), **D**ialysis (hypotony).

Q: The risk of rhegmatogenous retinal detachment is increased in all of the following except?

Hyperopia. **Explanation:** Rhegmatogenous Retinal Detachment (RRD) occurs when a break (hole or tear) in the neurosensory retina allows liquefied vitreous to enter the subretinal space. The risk is primarily increased by conditions that cause vitreoretinal traction or thinning of the peripheral retina. **Why Hyperopia is the correct answer:** **Hyperopia (Option C)** is associated with a shorter axial length of the eyeball. In contrast, **Myopia** (especially high myopia) is a major risk factor for RRD because the elongated globe leads to thinning of the retina and early vitreous liquefaction. Hyperopic eyes are generally "sturdier" regarding retinal breaks and are actually associated with a *decreased* risk of RRD compared to the general population. **Why the other options are incorrect:** * **Pseudophakia (Option A):** Post-cataract surgery (especially if the posterior capsule is ruptured) leads to biochemical changes in the vitreous and increased mobility (endophthalmodonesis), significantly raising the risk of RRD. * **Trauma (Option B):** Direct ocular trauma can cause immediate retinal tears (dialysis) or late-onset detachment due to vitreous base traction. * **Lattice Degeneration (Option C):** This is the most important peripheral retinal degeneration predisposing to RRD. It involves thinning of the inner retinal layers and strong vitreoretinal adhesions at the margins of the lesion. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site of a retinal break:** Superotemporal quadrant. * **Most common type of RD:** Rhegmatogenous. * **Shafer’s Sign:** Presence of "tobacco dust" (RPE cells) in the anterior vitreous; pathognomonic for a retinal tear. * **Horseshoe tear:** The most common type of tear leading to RRD, caused by posterior vitreous detachment (PVD).

Q: All of the following are true for colloid bodies (drusens) except?

Usually associated with marked loss of vision.. **Explanation:** Drusen (colloid bodies) are extracellular deposits of metabolic waste products that accumulate between the retinal pigment epithelium (RPE) and the inner collagenous layer of Bruch’s membrane. **Why Option C is the correct answer (The "Except"):** In most cases, drusen are asymptomatic and do not cause significant visual impairment. They are often incidental findings during a fundus examination in elderly patients. Marked loss of vision only occurs if drusen progress to advanced stages of Age-Related Macular Degeneration (ARMD), such as geographic atrophy or choroidal neovascularization (CNV). Therefore, saying they are "usually" associated with marked loss of vision is clinically incorrect. **Analysis of Incorrect Options:** * **Option A:** Drusen are histologically described as hyaline excrescences (nodular thickenings) of Bruch’s membrane. * **Option B:** They are formed by the accumulation of lipids and proteins secreted by the RPE cells as a result of failing metabolic clearance. * **Option D:** Large, soft, confluent drusen are a major risk factor and precursor for "wet" (exudative) ARMD, also known as disciform macular degeneration. **NEET-PG High-Yield Pearls:** * **Hard Drusen:** Small, discrete, and carry a lower risk of progression. * **Soft Drusen:** Large, fuzzy borders, and carry a high risk for ARMD. * **Fundus Appearance:** They appear as small, yellow-white spots at the posterior pole. * **Fluorescein Angiography (FFA):** Drusen show **"Point Hyperfluorescence"** due to a window defect (RPE atrophy) or staining.

Q: Retinoblastoma stage III is treated by which of the following?

Exenteration. **Explanation:** The management of Retinoblastoma (RB) is determined by the extent of the disease, categorized by the Reese-Ellsworth or International Classification. **Why Exenteration is correct:** **Stage III Retinoblastoma** refers to **extraocular extension** where the tumor has breached the sclera and involves the orbital tissues, but remains confined to the orbit. In such cases, **Exenteration** (removal of the eyeball along with all orbital contents including muscles, fat, and connective tissue) is the surgical treatment of choice to ensure complete removal of the extraocular tumor mass. This is typically followed by adjuvant chemotherapy and radiotherapy to prevent systemic spread. **Why other options are incorrect:** * **A. Enucleation:** This is the treatment of choice for **Stage II** (intraocular tumor where the eye cannot be saved, e.g., Group E) or when there is involvement of the optic nerve. It is insufficient for Stage III because it leaves behind the extraocular orbital tumor. * **C. Radiotherapy:** While used as an adjuvant therapy in Stage III or as a primary treatment for small, bilateral tumors (to preserve vision), it is not the definitive surgical management for orbital extension (Stage III). **High-Yield Clinical Pearls for NEET-PG:** * **Most common intraocular tumor in children:** Retinoblastoma. * **Most common presentation:** Leukocoria (White pupillary reflex), followed by strabismus. * **Pathognomonic Histology:** Flexner-Wintersteiner rosettes. * **Calcification:** Present in 90% of cases (visible on CT scan; "fine, gritty" appearance). * **Genetics:** Mutation in the **RB1 gene** on chromosome **13q14**. * **Trilateral Retinoblastoma:** Bilateral RB associated with Pinealoblastoma.

Q: Deletion of both Rb (retinoblastoma) genes in the same developing cell is most characteristically associated with the development of what condition?

White pupil. **Explanation:** The question describes the **Knudson’s "Two-Hit" Hypothesis**, which is the genetic hallmark of **Retinoblastoma**. Retinoblastoma is the most common primary intraocular malignancy of childhood. It occurs due to the inactivation of both alleles of the **RB1 tumor suppressor gene** located on chromosome **13q14**. When both genes are deleted or mutated in a retinal cell, uncontrolled proliferation leads to a retinal tumor. **Why "White Pupil" is correct:** The most common clinical presentation of Retinoblastoma (seen in over 60% of cases) is **Leukocoria**, also known as a **"White Pupillary Reflex."** This occurs because the white, vascularized mass of the tumor behind the lens reflects light back through the pupil, replacing the normal red reflex. **Why other options are incorrect:** * **Blue Sclera:** Associated with **Osteogenesis Imperfecta**, Ehlers-Danlos syndrome, or Buphthalmos (thinning of the sclera). * **No Iris (Aniridia):** A congenital bilateral condition often associated with **WAGR syndrome** (Wilms tumor, Aniridia, Genitourinary anomalies, and intellectual disability), involving the **PAX6 gene**, not the RB1 gene. * **Subluxed Lens:** Characteristically seen in **Marfan Syndrome** (superior-temporal) or **Homocystinuria** (inferior-nasal). **High-Yield Clinical Pearls for NEET-PG:** * **Second most common sign:** Strabismus (squint). * **Pathology:** Look for **Flexner-Wintersteiner rosettes** (highly specific) and **Homer-Wright rosettes**. * **Calcification:** Dystrophic calcification within the tumor is a classic feature seen on B-scan USG or CT. * **Trilateral Retinoblastoma:** Bilateral retinoblastoma associated with a pineal gland tumor (Pineoblastoma). * **Inheritance:** 40% are heritable (germline mutation, usually bilateral); 60% are sporadic (somatic mutation, usually unilateral).

Question 1

A young patient presents with significant loss of central vision and a normal ERG. There is no obvious family history of similar presentation. What is the most likely diagnosis?

Accepted Answer

Stargardt's disease

Answer

Best's disease

Answer

Retinitis Pigmentosa

Answer

Cone Rod Dystrophy

Question 2

What is the objective of the ETDRS study?

Accepted Answer

Effect of aspirin on the course of diabetic retinopathy

Answer

To observe patients with severe diabetic retinopathy in type 1 and type 2 diabetes over 2 years to determine visual outcomes

Answer

To evaluate whether photocoagulation prevents severe visual loss in eyes with diabetic retinopathy

Answer

ALL of the above

Question 3

A 25-year-old executive presents with metamorphopsia in his right eye. Fundus examination shows a shallow detachment at the macula. Fluorescein angiography reveals a 'smoke stack' sign. Which of the following management should be given?

Accepted Answer

Observation for spontaneous recovery

Answer

Topical antibiotic-corticosteroid combination

Answer

Systemic corticosteroid for two weeks and then taper

Answer

Pulse methylprednisolone for three days and then taper

Question 4

What is the Gunn sign?

Accepted Answer

Tapering of veins on either side of the crossings

Answer

Silver wiring of arterioles

Answer

Deflection of veins at arteriovenous crossing

Answer

Copper wiring of arterioles

Question 5

Argon laser is used in all except:

Accepted Answer

Retinitis pigmentosa

Answer

Retinal detachment

Answer

Retinal vein occlusion

Answer

Eales' disease

Question 6

Which of the following conditions is associated with cystoid macular edema?

Accepted Answer

Central Retinal Vein Occlusion

Answer

Overuse of ocular analgesics

Answer

Glaucoma

Answer

Topical steroid therapy

Question 7

The risk of rhegmatogenous retinal detachment is increased in all of the following except?

Accepted Answer

Hyperopia

Answer

Pseudophakia

Answer

Trauma

Answer

Lattice degeneration

Question 8

All of the following are true for colloid bodies (drusens) except?

Accepted Answer

Usually associated with marked loss of vision.

Answer

Hyaline excrescences of Bruch's membrane.

Answer

Secreted by pigment epithelial cells.

Answer

A precursor of disciform macular degeneration in some eyes.

Question 9

Retinoblastoma stage III is treated by which of the following?

Accepted Answer

Exenteration

Answer

Enucleation

Answer

Radiotherapy

Answer

None of the above

Question 10

Deletion of both Rb (retinoblastoma) genes in the same developing cell is most characteristically associated with the development of what condition?

Accepted Answer

White pupil

Answer

Blue sclera

Answer

No iris

Answer

Subluxed lens

Diseases of the Retina — MCQs

Diseases of the Retina — MCQs

On this page

Practice by Chapter

Want unlimited practice?