Diseases of the Retina Practice Questions

Q: Lacquer cracks in pathological myopia are due to breaks in which layer?

Bruch's membrane. **Explanation:** **Lacquer cracks** are a hallmark clinical feature of **pathological myopia** (high myopia). They represent spontaneous, linear, or stellate breaks in **Bruch’s membrane**. 1. **Why Bruch’s membrane is correct:** In pathological myopia, the progressive elongation of the globe (increased axial length) leads to mechanical stretching of the posterior pole. Bruch’s membrane is a relatively inelastic structure; when the stretching exceeds its tensile strength, it develops linear dehiscences or "cracks." These appear clinically as fine, irregular, yellowish-white horizontal lines deep to the retina. 2. **Why the other options are wrong:** * **Retinal Pigment Epithelium (RPE):** While the RPE may undergo secondary atrophy or thinning over a lacquer crack, the primary anatomical break occurs in Bruch's membrane. * **Outer and Inner Plexiform Layers:** These are neural layers of the retina. Breaks here would represent retinoschisis or retinal holes, not the characteristic linear lesions seen in lacquer cracks. **Clinical Pearls for NEET-PG:** * **Significance:** Lacquer cracks are a major risk factor for the development of **Myopic Choroidal Neovascularization (CNV)**, as they provide a pathway for vessels to grow from the choroid into the sub-retinal space. * **Forster-Fuchs Spot:** A pigmented, circular lesion at the macula caused by a healed CNV or subretinal hemorrhage associated with lacquer cracks. * **Other Pathological Myopia findings:** Posterior staphyloma (pathognomonic), tilted disc, and peripheral lattice degeneration.

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

Diabetes mellitus. **Explanation:** **Macular Edema** occurs due to the breakdown of the blood-retinal barrier, leading to the accumulation of fluid in the intraretinal layers of the macula. **Why Diabetes Mellitus is Correct:** Diabetic Macular Edema (DME) is the most common cause of vision loss in patients with Diabetic Retinopathy. Chronic hyperglycemia leads to pericyte loss and endothelial damage, causing capillary leakage. This results in fluid accumulation within the Henle’s layer (outer plexiform layer), often presenting as **Cystoid Macular Edema (CME)**. **Analysis of Incorrect Options:** * **A. Central Retinal Artery Occlusion (CRAO):** This presents with **cloudy swelling** (intracellular edema) of the entire retina due to ischemia, not localized macular edema. The classic finding is a "Cherry Red Spot" because the fovea is thin and reflects the underlying vascular choroid. * **B. Papilledema:** This refers specifically to bilateral swelling of the **optic disc** due to increased intracranial pressure. While severe cases (Grade IV/V) may show macular fan/star formation (exudates), the primary pathology is disc edema, not macular edema. * **D. Age-related Macular Degeneration (ARMD):** Dry ARMD is characterized by **Drusen** and geographic atrophy. While Wet (Neovascular) ARMD involves subretinal fluid/hemorrhage due to CNVM, "Macular Edema" as a standalone clinical entity is most classically associated with systemic vascular diseases like Diabetes. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Optical Coherence Tomography (OCT) is used to quantify macular thickness. * **First-line Treatment for DME:** Intravitreal Anti-VEGF injections (e.g., Ranibizumab, Aflibercept). * **Irvine-Gass Syndrome:** A specific type of CME occurring after cataract surgery. * **Histological Site:** Fluid in CME typically accumulates in the **Outer Plexiform Layer (Henle’s layer)**.

Q: Regarding Retinitis pigmentosa, which of the following statements is FALSE?

Early loss of central vision is a common initial symptom.. **Explanation:** Retinitis Pigmentosa (RP) is a hereditary, progressive dystrophy primarily affecting the **rod photoreceptors** first, followed by the cones. **Why Option C is the correct (False) statement:** In RP, the degeneration starts in the mid-peripheral retina where rod density is highest. Consequently, the initial symptoms are **nyctalopia (night blindness)** and **peripheral field loss** (ring scotoma). Central vision is typically **preserved** until the late stages of the disease when cone involvement becomes significant or complications like Cystoid Macular Edema (CME) occur. Therefore, early loss of central vision is not a common initial symptom. **Analysis of other options:** * **Option A:** Night blindness is the hallmark initial symptom due to early rod dysfunction. * **Option B & D:** These describe the classic **"Diagnostic Triad"** of RP fundus findings: 1. **Bony spicule pigmentation** (perivascular pigment clumps in the mid-periphery). 2. **Arteriolar attenuation** (narrowing of retinal vessels). 3. **Waxy pallor of the optic disc** (due to consecutive optic atrophy). **NEET-PG High-Yield Pearls:** * **Inheritance:** Most common is Autosomal Recessive; most severe is X-linked. * **Visual Field:** Characteristically shows a **Ring Scotoma**. * **ERG Findings:** The Electroretinogram (ERG) is **subnormal or extinguished** even before fundus changes appear (earliest diagnostic tool). * **Associated Syndromes:** **Usher Syndrome** (RP + Sensorineural hearing loss) and **Laurence-Moon-Biedl Syndrome** (RP + Obesity + Polydactyly + Hypogonadism + Mental retardation). * **Ocular Associations:** Posterior subcapsular cataract, Myopia, and Open-angle glaucoma.

Q: Bilateral retinoblastoma is ideally managed by which of the following except?

Laser excision. **Explanation:** The management of **Bilateral Retinoblastoma** focuses on a dual goal: preserving life and, where possible, preserving vision. **Why "Laser Excision" is the correct answer:** In ophthalmology, lasers are used for **photocoagulation** (to cut off blood supply to a tumor) or **thermotherapy**, but **"Laser Excision"** is not a recognized or practiced surgical technique for retinoblastoma. The tumor is highly friable; attempting to "excise" it with a laser would risk endophthalmitis, vitreous seeding, and systemic dissemination of malignant cells. **Analysis of other options:** * **Radiation:** External Beam Radiotherapy (EBRT) or Brachytherapy (plaque) are standard treatments for bilateral cases to avoid bilateral enucleation, though EBRT is now less preferred due to the risk of secondary malignancies (e.g., Osteosarcoma). * **Enucleation:** This remains the treatment of choice for "Group E" (advanced) eyes where there is no hope for vision or if the optic nerve is involved. In bilateral cases, the worse eye is often enucleated while the better eye is managed conservatively. * **Thermotherapy:** Specifically **Transpupillary Thermotherapy (TTT)** using an Infrared Diode laser (810nm), is a standard focal therapy for small, posterior pole tumors. **Clinical Pearls for NEET-PG:** * **Most common intraocular tumor of childhood:** Retinoblastoma. * **Genetics:** Associated with the **RB1 gene** on chromosome **13q14**. Bilateral cases are always germinal/heritable. * **Chemoreduction:** The current "Gold Standard" for bilateral cases is systemic chemotherapy (Vincristine, Etoposide, Carboplatin) to shrink tumors before applying focal therapies like TTT or Cryotherapy. * **Pathology:** Look for **Flexner-Wintersteiner rosettes** (pathognomonic) and calcification on CT scan.

Q: What finding in a fundus examination of a myopic patient is indicated by an arrow?

Foster-Fuchs spot. ***Foster-Fuchs spot*** - A **dark pigmented macular lesion** seen in high myopia, resulting from **subretinal neovascularization** followed by hemorrhage and subsequent **retinal pigment epithelium (RPE) hyperplasia**. - Appears as a **well-defined dark spot** in the macular area on fundus examination, representing the end-stage of **choroidal neovascular membrane** formation in pathologic myopia. *Lacquer cracks* - These are **linear breaks in Bruch's membrane** that appear as yellowish or whitish streaks, not dark pigmented spots. - They represent **mechanical breaks** due to excessive axial elongation in high myopia, appearing as **crack-like linear lesions** rather than focal dark spots. *Arlt line* - This is a **conjunctival scar** associated with **trachoma**, not a fundus finding at all. - It appears as a **horizontal line of scarring** in the superior tarsal conjunctiva, completely unrelated to myopic retinal changes. *Myopic crescent* - This refers to **peripapillary atrophy** around the optic disc, appearing as a pale crescent-shaped area. - It represents **chorioretinal atrophy** adjacent to the optic nerve head, not a macular pigmented lesion as indicated by the arrow.

Q: What is the cause of blindness in Central Retinal Vein Occlusion (CRVO)?

All of the above. **Explanation:** Central Retinal Vein Occlusion (CRVO) is a common retinal vascular disorder characterized by the "blood and thunder" fundus appearance. Blindness or severe visual loss in CRVO is multifactorial, resulting from both acute changes and long-term complications. **Why "All of the above" is correct:** 1. **Cystoid Macular Edema (CME):** This is the **most common cause** of decreased vision in both ischemic and non-ischemic CRVO. Increased intraluminal pressure leads to the leakage of fluid into the Henle’s layer of the macula, causing structural damage and loss of central acuity. 2. **Macular Hemorrhage:** In the acute phase, extensive deep and superficial (flame-shaped) hemorrhages can involve the fovea, directly blocking photoreceptors and leading to a sudden drop in vision. 3. **Vitreous Hemorrhage:** This is a late-stage complication primarily seen in **Ischemic CRVO**. Retinal ischemia triggers the release of Vascular Endothelial Growth Factor (VEGF), leading to Neovascularization of the Disc (NVD) or elsewhere (NVE). These fragile new vessels can rupture, causing vitreous hemorrhage and sudden vision loss. **Clinical Pearls for NEET-PG:** * **The "90-Day Glaucoma":** Ischemic CRVO is highly associated with Neovascular Glaucoma (NVG), which typically develops around 3 months after the occlusion. * **Investigation of Choice:** **Optical Coherence Tomography (OCT)** is used to monitor Macular Edema, while **Fundus Fluorescein Angiography (FFA)** is the gold standard to differentiate between Ischemic and Non-ischemic types (based on areas of capillary non-perfusion). * **Management:** Intravitreal Anti-VEGF injections (e.g., Ranibizumab, Aflibercept) are the mainstay of treatment for macular edema. Pan-retinal photocoagulation (PRP) is indicated if neovascularization develops.

Q: Malignant change in a choroidal nevus is evidenced by:

All of the above. **Explanation:** The transformation of a benign choroidal nevus into a **malignant melanoma** is a critical clinical progression. To differentiate between a stable nevus and an early melanoma, clinicians use the **"TFSOM" mnemonic** (To Find Small Ocular Melanoma). * **Increased height and pigmentation (Option A):** A thickness of >2 mm is a major risk factor. Rapid growth or an increase in the density of pigmentation suggests active cellular proliferation characteristic of malignancy. * **Orange pigment (Option B):** This represents the accumulation of **lipofuscin** at the level of the Retinal Pigment Epithelium (RPE). It indicates metabolic distress and chronic RPE damage caused by an underlying growing tumor. This is one of the most predictive signs of malignancy. * **Serous detachment (Option C):** Malignant cells disrupt the overlying RPE and the blood-retinal barrier, leading to the leakage of subretinal fluid. The presence of subretinal fluid (serous detachment) is a hallmark of activity and transformation. Since all three features are established clinical indicators of malignant transformation, **Option D** is the correct answer. **High-Yield Clinical Pearls (TFSOM Mnemonic):** To remember the risk factors for malignant change, use: **"To Find Small Ocular Melanoma Using Helpful Hints Daily"** * **T** – **T**hickness >2 mm * **F** – Subretinal **F**luid * **S** – **S**ymptoms (flashes/floaters/blurred vision) * **O** – **O**range pigment (Lipofuscin) * **M** – **M**argin within 3 mm of the optic disc * **UH** – **U**ltrasonographic **H**ollow (low internal reflectivity) * **D** – Absence of **D**rusen (Drusen usually indicate a long-standing, stable, benign nevus).

Q: Ocriplasmin is the newer drug used in which of the following conditions?

Vitreomacular traction. **Explanation:** **Ocriplasmin** is a recombinant truncated form of human **plasmin**. It is the first pharmacological agent approved for the treatment of symptomatic **Vitreomacular Traction (VMT)** and small macular holes. **Why Option B is Correct:** The underlying mechanism of VMT involves an incomplete posterior vitreous detachment (PVD) where the vitreous remains abnormally adherent to the macula, causing mechanical distortion. Ocriplasmin works through **enzymatic vitreolysis**. It targets and breaks down protein components (laminin, fibronectin, and collagen) at the vitreoretinal interface. By dissolving these "glue-like" proteins, it facilitates the release of traction and promotes a complete PVD without the need for surgical vitrectomy. **Why Other Options are Incorrect:** * **A. Retinal break:** These are treated with laser photocoagulation or cryopexy to create a chorioretinal scar. Ocriplasmin could theoretically worsen a break by inducing vitreous movement. * **C & D. Submacular/Diabetic macular bleed:** These conditions involve vascular pathology or neovascularization. Management typically involves Anti-VEGF agents (like Ranibizumab or Aflibercept) or surgical evacuation (for submacular hemorrhage), not enzymatic vitreolysis. **High-Yield Clinical Pearls for NEET-PG:** * **Route of Administration:** Intravitreal injection (0.125 mg). * **Indications:** Best results are seen in patients with focal VMT (adhesion ≤1500 µm) and those without an epiretinal membrane (ERM). * **Side Effects:** Patients may report "chromatopsia" (yellowish vision) or transient electroretinogram (ERG) changes post-injection. * **Alternative Treatment:** Pars Plana Vitrectomy (PPV) remains the gold standard for severe or non-responsive VMT.

Question 1

Lacquer cracks in pathological myopia are due to breaks in which layer?

Accepted Answer

Bruch's membrane

Answer

Retinal pigment epithelium

Answer

Outer plexiform layer

Answer

Inner plexiform layer

Question 2

A child presents with unilateral white reflex and raised intraocular pressure. What is the required investigation, excluding one option?

Accepted Answer

CT scan

Answer

Ultrasound (USG)

Answer

Tonometer

Answer

Observation under anesthesia

Question 3

Which of the following conditions is associated with Macular edema?

Accepted Answer

Diabetes mellitus

Answer

Central retinal artery occlusion (CRAO)

Answer

Papilledema

Answer

Age-related macular degeneration

Question 4

Regarding Retinitis pigmentosa, which of the following statements is FALSE?

Accepted Answer

Early loss of central vision is a common initial symptom.

Answer

Typically presents with night blindness.

Answer

Characteristic fundus findings include a waxy disc.

Answer

Attenuation of retinal vessels is a notable sign.

Question 5

Bilateral retinoblastoma is ideally managed by which of the following except?

Accepted Answer

Laser excision

Answer

Radiation

Answer

Enucleation

Answer

Thermotherapy

Question 6

What finding in a fundus examination of a myopic patient is indicated by an arrow?

Accepted Answer

Foster-Fuchs spot

Answer

Lacquer cracks

Answer

Arlt line

Answer

Myopic crescent

Question 7

What is the cause of blindness in Central Retinal Vein Occlusion (CRVO)?

Accepted Answer

All of the above

Answer

Cystoid macular edema

Answer

Macular hemorrhage

Answer

Vitreous hemorrhage

Question 8

Malignant change in a choroidal nevus is evidenced by:

Accepted Answer

All of the above

Answer

Increased pigmentation or height of the nevus

Answer

Appearance of orange patches of lipofuscin over the surface

Answer

Appearance of serous detachment in the area of nevus

Question 9

All of the following statements are true regarding indirect ophthalmoscopy, except:

Accepted Answer

It can be used in cases of hazy ocular media.

Answer

It can be performed with the patient in any position.

Answer

There is no stereopsis.

Answer

The retinal periphery cannot be examined.

Question 10

Ocriplasmin is the newer drug used in which of the following conditions?

Accepted Answer

Vitreomacular traction

Answer

Retinal break

Answer

Submacular bleed

Answer

Diabetic macular bleed

Diseases of the Retina — MCQs

Diseases of the Retina — MCQs

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