Diseases of the Retina Practice Questions

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 is NOT a complication of pathological myopia?

Tractional Retinal detachment. **Explanation:** Pathological myopia (Degenerative Myopia) is characterized by an axial length >26.5 mm and progressive degenerative changes in the posterior segment. **Why Tractional Retinal Detachment (TRD) is the correct answer:** TRD is typically caused by proliferative membranes that pull the retina away from the RPE, most commonly seen in **Proliferative Diabetic Retinopathy (PDR)** or Eales disease. In pathological myopia, the characteristic type of detachment is **Rhegmatogenous Retinal Detachment (RRD)**, caused by peripheral retinal degenerations like lattice degeneration and subsequent retinal holes/tears. **Analysis of Incorrect Options:** * **Complicated Cataract:** High myopia is strongly associated with early-onset **posterior subcapsular cataracts** and nuclear sclerosis. * **Vitreous Hemorrhage:** This occurs due to mechanical stretching and rupture of retinal vessels or as a result of bleeding from a **Fuchs’ Spot** (Choroidal Neovascularization). * **Lacquer Cracks:** These are pathognomonic linear breaks in the **Bruch’s membrane**. They appear as yellowish-white horizontal streaks and are a major risk factor for developing subretinal neovascular membranes. **High-Yield Clinical Pearls for NEET-PG:** * **Posterior Staphyloma:** The hallmark sign of pathological myopia (bulging of the weakened sclera). * **Fuchs’ Spot:** A pigmented circular lesion at the macula caused by healed CNVM. * **Foster-Kennedy Syndrome vs. Pseudo-Foster Kennedy:** High myopia can cause "tilted discs," which may mimic optic nerve pathology. * **Management:** Prophylactic barrier laser photocoagulation is indicated for symptomatic retinal breaks to prevent RRD.

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: Both soft and hard exudates are seen in which of the following conditions?

All of the above. ### Explanation The presence of both soft and hard exudates is a hallmark of retinal vascular diseases characterized by both **increased vascular permeability** and **retinal ischemia**. **1. Understanding the Concepts:** * **Hard Exudates:** These are yellowish, waxy-looking deposits with distinct margins. They are composed of lipid and proteinaceous material that leaks from damaged, hyperpermeable capillaries (e.g., microaneurysms). They are typically found in the Outer Plexiform Layer (Henle’s layer in the macula). * **Soft Exudates (Cotton Wool Spots):** These are not true exudates but rather **micro-infarcts** of the Retinal Nerve Fiber Layer (RNFL). They occur due to the occlusion of terminal retinal arterioles, leading to axoplasmic stasis. **2. Why "All of the Above" is Correct:** * **Diabetes Mellitus:** Hard exudates are a classic feature of Diabetic Macular Edema (DME). Soft exudates appear as the disease progresses to the Pre-proliferative (PPDR) stage, signaling significant ischemia. * **Hypertension:** In Grade 3 and 4 Hypertensive Retinopathy (Keith-Wagener-Barker classification), both are seen. Hard exudates often form a "macular star," while soft exudates indicate acute arteriolar narrowing and ischemia. * **Eale’s Disease:** This is an idiopathic peripheral perivasculitis. It involves peripheral non-perfusion (leading to soft exudates/ischemia) and vascular leakage (leading to hard exudates and vitreous hemorrhage). **Clinical Pearls for NEET-PG:** * **Hard Exudates Location:** Outer Plexiform Layer (OPL). * **Soft Exudates Location:** Nerve Fiber Layer (NFL). * **Differential for Macular Star:** Hypertension, Neuroretinitis, Papilledema, and Cat-scratch disease. * **Roth Spots:** Hemorrhages with a white center (fibrin), seen in Subacute Bacterial Endocarditis (SBE) and Leukemia.

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: A 70-year-old man presents with deterioration of vision 3 weeks after cataract extraction and intraocular lens implantation. Slit lamp examination shows honeycomb maculopathy and fluorescein angiography shows 'flower petal' hyperfluorescence. What is the most likely diagnosis?

Cystoid Macular Edema. **Explanation:** The clinical presentation and classic imaging findings point directly to **Cystoid Macular Edema (CME)**, specifically **Irvine-Gass Syndrome**, which occurs following cataract surgery. **1. Why the Correct Answer is Right:** CME involves the accumulation of fluid in the outer plexiform (Henle’s) and inner nuclear layers of the retina. * **Honeycomb Maculopathy:** On slit-lamp biomicroscopy, the fluid-filled cysts create a characteristic honeycomb appearance. * **Flower Petal Appearance:** On Fluorescein Angiography (FFA), dye leaks into the star-shaped Henle’s layer around the fovea, creating a "petalloid" or "flower petal" pattern of hyperfluorescence. * **Timing:** Post-cataract CME typically peaks 4–6 weeks after surgery, matching this patient's 3-week timeline. **2. Why Other Options are Incorrect:** * **ARMD:** Presents with drusen (Dry) or choroidal neovascularization/hemorrhage (Wet). FFA would show "stippled" fluorescence or a classic "smoke-stack/pedal" leak, not a petalloid pattern. * **CSR:** Typically affects younger males (20–50 years) and is associated with stress/steroids. FFA shows a "smoke-stack" or "ink-blot" appearance. * **Macular Dystrophy:** These are usually bilateral, genetic conditions (e.g., Stargardt’s) presenting at a younger age with specific patterns like "beaten bronze" macula or "dark choroid" on FFA. **High-Yield Clinical Pearls for NEET-PG:** * **Irvine-Gass Syndrome:** CME occurring specifically after cataract surgery. * **Gold Standard Investigation:** Optical Coherence Tomography (OCT) is now the investigation of choice (shows intraretinal cystic spaces), though FFA remains a classic exam favorite for its "flower petal" description. * **Treatment:** First-line management includes topical NSAIDs (e.g., Nepafenac or Ketorolac) and topical steroids.

Q: What is the investigation of choice for vitreous hemorrhage?

B-Scan. **Explanation:** The investigation of choice for vitreous hemorrhage is **B-Scan (Brightness Scan) ultrasonography**. **Why B-Scan is the Correct Answer:** In cases of vitreous hemorrhage, the blood creates media opacity, making it impossible for the clinician to visualize the posterior segment (retina) using an ophthalmoscope. B-Scan is a two-dimensional, cross-sectional gray-scale ultrasound that can "see through" opaque media. It is essential to rule out underlying sight-threatening conditions such as **Retinal Detachment (RD)** or intraocular tumors, which may be the cause of the hemorrhage. On B-Scan, fresh vitreous hemorrhage appears as low-amplitude, mobile dots or echoes. **Why Other Options are Incorrect:** * **A. Ultrasound Biomicroscopy (UBM):** This uses high-frequency ultrasound to visualize the **anterior segment** (ciliary body, iris, angle) in high resolution. It cannot penetrate deep enough to evaluate the posterior vitreous or retina. * **B. A-Scan:** This is a one-dimensional linear scan used primarily for **biometry** (measuring axial length) to calculate IOL power. It does not provide a structural image of the retina. * **D. Optical Coherence Tomography (OCT):** OCT uses light waves (interferometry). Like ophthalmoscopy, light cannot penetrate dense blood; therefore, OCT is ineffective when a significant vitreous hemorrhage is present. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause** of vitreous hemorrhage: Diabetic Retinopathy (Proliferative). * **Most common cause in trauma:** Mechanical globe injury. * **B-Scan "Membrane" Differentiation:** On B-Scan, a **Retinal Detachment** appears as a high-amplitude, thick, bright membrane that is attached to the optic disc, whereas a **Posterior Vitreous Detachment (PVD)** is a thin, low-amplitude membrane that moves freely and is not attached to the disc.

Question 1

Argon laser is used in all except:

Accepted Answer

Retinitis pigmentosa

Answer

Retinal detachment

Answer

Retinal vein occlusion

Answer

Eales' disease

Question 2

Which of the following is NOT a complication of pathological myopia?

Accepted Answer

Tractional Retinal detachment

Answer

Complicated cataract

Answer

Vitreous hemorrhage

Answer

Lacquer cracks

Question 3

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 4

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 5

Both soft and hard exudates are seen in which of the following conditions?

Accepted Answer

All of the above

Answer

Hypertension

Answer

Diabetes Mellitus

Answer

Eale's disease

Question 6

Retinoblastoma stage III is treated by which of the following?

Accepted Answer

Exenteration

Answer

Enucleation

Answer

Radiotherapy

Answer

None of the above

Question 7

A 25-year-old male presents with decreased vision in both eyes following a viral illness. On examination, he has mild decrease in visual acuity and paracentral scotomas. Examination of the fundus shows wedge-shaped parafoveal retinal lesions. What is he MOST likely suffering from?

Accepted Answer

Acute Macular Neuroretinopathy

Answer

Serpiginous Choroidopathy

Answer

Birdshot Retinochoroidopathy

Answer

Acute zonal occult outer retinopathy

Question 8

A 70-year-old man presents with deterioration of vision 3 weeks after cataract extraction and intraocular lens implantation. Slit lamp examination shows honeycomb maculopathy and fluorescein angiography shows 'flower petal' hyperfluorescence. What is the most likely diagnosis?

Accepted Answer

Cystoid Macular Edema

Answer

Age-related macular degeneration (ARMD)

Answer

Central Serous Retinopathy (CSR)

Answer

Macular Dystrophy

Question 9

What is the investigation of choice for vitreous hemorrhage?

Accepted Answer

B-Scan

Answer

Ultrasound biomicroscopy

Answer

A-Scan

Answer

OCT

Question 10

Anterior vitreous cells are least likely to be found in which of the following conditions?

Accepted Answer

Retinitis pigmentosa

Answer

Cytomegalovirus (CMV) retinitis

Answer

Serpiginous choroidopathy

Answer

Chronic cyclitis

Diseases of the Retina — MCQs

Diseases of the Retina — MCQs

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