Diseases of the Retina — MCQs

Diseases of the Retina Indian Medical PG Practice Questions and MCQs

Question 381: Vitreous hemorrhage produces which of the following?

A. Sudden painless loss of vision (Correct Answer)
B. Sudden painful loss of vision
C. Gradual painless loss of vision
D. Gradual painful loss of vision

Explanation: **Explanation:** **Vitreous hemorrhage** refers to the extravasation of blood into the vitreous cavity. Because the vitreous is a normally transparent medium, the presence of blood acutely blocks the passage of light to the retina, leading to a **sudden, painless loss of vision.** **Why Option A is Correct:** The retina and vitreous lack sensory innervation; therefore, any pathology confined to these structures (like hemorrhage) does not trigger pain. The onset is sudden because the bleeding occurs rapidly into the gel, often described by patients as "floaters," "cobwebs," or a "red haze" before progressing to a significant visual deficit. **Why the other options are Incorrect:** * **Option B (Sudden painful):** This is characteristic of conditions involving high intraocular pressure or inflammation, such as **Acute Angle Closure Glaucoma** or Endophthalmitis. * **Option C (Gradual painless):** This is typical of chronic degenerative conditions like **Senile Cataract**, Open-angle glaucoma, or Diabetic Retinopathy (pre-hemorrhage). * **Option D (Gradual painful):** This is rare but can be seen in chronic inflammatory conditions like **Chronic Uveitis** or ocular malignancies. **Clinical Pearls for NEET-PG:** * **Most Common Cause:** Proliferative Diabetic Retinopathy (PDR) is the most common cause overall. In trauma cases, it is the most common cause in young adults. * **Fresh Blood vs. Old Blood:** Fresh hemorrhage appears bright red; long-standing blood appears yellowish-white (ochre membrane) due to hemoglobin degradation. * **Diagnosis:** If the fundus is not visible due to dense hemorrhage, the **B-Scan Ultrasound** is the mandatory next step to rule out retinal detachment. * **Management:** Conservative (bed rest with head elevation) is tried first. If non-clearing (usually >1–3 months) or associated with retinal detachment, **Pars Plana Vitrectomy (PPV)** is indicated.

Question 382: Regarding Central Retinal Artery Occlusion (CRAO), which statement is true?

A. Atherosclerosis in carotid arteries and emboli originating in the heart are the two most common causes. (Correct Answer)
B. Relative afferent pupillary defect is absent.
C. Local intra-arterial thrombolysis has proven benefit.
D. The majority of patients will recover to gain good visual acuity.

Explanation: **Explanation:** **1. Why Option A is Correct:** Central Retinal Artery Occlusion (CRAO) is essentially an "ischemic stroke of the eye." The most common underlying mechanism is **embolism**. These emboli typically originate from **atherosclerotic plaques in the carotid arteries** (Cholesterol/Hollenhorst plaques) or from the **heart** (Calcific emboli from valves or thrombi due to Atrial Fibrillation). Identifying these sources is critical for preventing future cerebrovascular accidents. **2. Why Other Options are Incorrect:** * **Option B:** In CRAO, there is severe retinal ischemia leading to a total loss of light perception or severe vision loss. This results in a **positive Relative Afferent Pupillary Defect (RAPD)** or Marcus Gunn pupil, as the eye cannot perceive the light stimulus effectively. * **Option C:** While local intra-arterial thrombolysis (using tPA) has been studied, its benefit remains **controversial** and is not established as a standard of care due to a narrow therapeutic window and high risk of complications. * **Option D:** The prognosis for CRAO is generally **poor**. Most patients suffer permanent, profound vision loss (counting fingers or worse) unless the occlusion is transient or involves a cilioretinal artery that spares the fovea. **Clinical Pearls for NEET-PG:** * **Classic Sign:** "Cherry-red spot" at the macula (due to the choroidal vasculature showing through the thin fovea amidst surrounding retinal edema). * **Ground Glass Appearance:** The retina appears milky white due to edema of the nerve fiber layer. * **Cilioretinal Artery:** Present in ~15-30% of the population; if present, it may spare central vision. * **Emergency Management:** Ocular massage, anterior chamber paracentesis, and IV Acetazolamide (to lower IOP and dislodge the embolus).

Question 383: ETDRS vision study is done in patients with diabetic retinopathy. ETDRS stands for:

A. Extended therapy for diabetic retinopathy and its study
B. Emergency treatment for diabetic retinopathy and study
C. Eye testing or rotatory drum and its study
D. Early treatment for diabetic retinopathy study (Correct Answer)

Explanation: ### Explanation **Correct Answer: D. Early Treatment Diabetic Retinopathy Study** The **Early Treatment Diabetic Retinopathy Study (ETDRS)** is a landmark clinical trial that established the gold standard for the classification and management of diabetic retinopathy (DR). **Why Option D is Correct:** The ETDRS was designed to evaluate the timing of laser photocoagulation and the role of aspirin in DR. Its most significant contributions include: 1. **Definition of CSME:** It defined **Clinically Significant Macular Edema (CSME)** and proved that focal/grid laser reduces the risk of moderate visual loss. 2. **ETDRS Charts:** It introduced the standardized logMAR charts (using 5 letters per line) which are now the universal standard for measuring visual acuity in clinical research. 3. **Classification:** It refined the Airlie House classification to categorize DR severity. **Why Other Options are Incorrect:** * **Option A & B:** These are distractors. While "Extended" or "Emergency" might sound plausible in a clinical context, the study specifically focused on the efficacy of **early** intervention (photocoagulation) before advanced complications occurred. * **Option C:** This is a nonsensical distractor. While "Eye testing" is involved, the acronym is specific to the name of the multicenter trial. **High-Yield Clinical Pearls for NEET-PG:** * **CSME Criteria (ETDRS):** 1. Retinal thickening within 500 µm of the center of the fovea. 2. Hard exudates within 500 µm of the center (if associated with thickening). 3. Retinal thickening ≥1 disc area in size, any part of which is within 1 disc diameter of the center. * **Visual Acuity:** ETDRS charts are used at a distance of **4 meters**. * **Aspirin:** The study concluded that aspirin does not prevent the progression of retinopathy but does not increase the risk of vitreous hemorrhage (safe for cardiovascular use).

Question 384: Which of the following is the earliest manifestation of retinal detachment?

A. Curtain obscuring the visual field
B. Floaters
C. Photopsia (Correct Answer)
D. Fall in visual acuity

Explanation: **Explanation:** **Retinal Detachment (RD)**, specifically the rhegmatogenous type, is a critical topic for NEET-PG. Understanding the chronological progression of symptoms is key to diagnosing the condition early. **Why Photopsia is the correct answer:** Photopsia (flashes of light) is the **earliest symptom** of retinal detachment or its precursor, posterior vitreous detachment (PVD). It occurs due to **vitreoretinal traction**. When the vitreous pulls on the neurosensory retina, it mechanically stimulates the photoreceptors. Since the retina can only translate stimuli into visual signals, this mechanical tugging is perceived as momentary flashes of light, usually in the peripheral field. **Analysis of Incorrect Options:** * **Floaters (B):** These are caused by vitreous opacities or "Schaffer’s sign" (tobacco dusting/RPE cells in the vitreous). While they occur early, they often follow or coincide with photopsia once a tear has actually formed. * **Curtain obscuring the visual field (A):** This represents a **progressive symptom**. As subretinal fluid accumulates and the retina detaches, a "dark veil" or curtain appears, corresponding to the area of detachment. * **Fall in visual acuity (D):** This is a **late manifestation**. Significant drop in vision occurs only when the detachment involves the **macula** ("Macula-off" RD) or if there is an associated vitreous hemorrhage. **High-Yield Clinical Pearls for NEET-PG:** 1. **Schaffer’s Sign:** The presence of pigment granules (tobacco dusting) in the anterior vitreous is pathognomonic for a retinal tear. 2. **Most common site** for a retinal dialyses: Inferotemporal quadrant. 3. **Most common site** for a retinal hole: Superotemporal quadrant. 4. **Gold Standard Investigation:** Indirect Ophthalmoscopy with scleral indentation. 5. **Surgical Management:** Scleral buckling, Pneumatic retinopexy, or Pars Plana Vitrectomy (PPV).

Question 385: Vitreous attachment to the retina is strongest at which location?

A. Ora serrata (Correct Answer)
B. Posterior pole
C. Superotemporal retina
D. Near the fovea

Explanation: The vitreous body is a transparent, gel-like structure that fills the posterior segment of the eye. While it appears to be loosely contained, it is firmly attached to the retina at specific anatomical landmarks. **Explanation of the Correct Answer:** **A. Ora serrata:** This is the correct answer. The strongest attachment of the vitreous is at the **vitreous base**, which is a 3-4 mm wide zone straddling the ora serrata (extending 2 mm anterior and 2 mm posterior to it). At this site, vitreous collagen fibers are embedded deeply into the basement membrane of the non-pigmented epithelium of the ciliary body and the internal limiting membrane (ILM) of the retina. This attachment is so strong that surgical separation often results in retinal tearing rather than vitreous detachment. **Explanation of Incorrect Options:** * **B. Posterior pole:** While the vitreous is in contact with the posterior pole, it is not a site of primary firm attachment. * **C. Superotemporal retina:** This is a common site for peripheral retinal degenerations (like lattice degeneration), but it is not an anatomical site of strongest vitreous attachment. * **D. Near the fovea:** The vitreous has a firm attachment at the **foveal margin** (macula), but it is significantly weaker than the attachment at the ora serrata. **NEET-PG High-Yield Pearls:** * **Hierarchy of Vitreous Attachment (Strongest to Weakest):** 1. Vitreous Base (Ora serrata) – **Strongest** 2. Optic Disc (Weiss Ring forms here during PVD) 3. Foveal Margin (Macula) 4. Along major retinal vessels * **Clinical Correlation:** Posterior Vitreous Detachment (PVD) occurs when the vitreous separates from the retina. It usually detaches from the optic disc and macula first, but **never** detaches from the vitreous base (ora serrata) under physiological conditions. * **Weiss Ring:** A circular opacity seen in the vitreous after it detaches from the optic nerve head, a pathognomonic sign of PVD.

Question 386: Which of the following is characteristically associated with proliferative diabetic retinopathy?

A. Cotton wool spots
B. Papilloedema
C. Soft exudates
D. Neovascularization (Correct Answer)

Explanation: **Explanation** Diabetic Retinopathy (DR) is broadly classified into Non-Proliferative (NPDR) and Proliferative (PDR). The hallmark of **Proliferative Diabetic Retinopathy (PDR)** is **Neovascularization** (the formation of new, fragile blood vessels). 1. **Why Neovascularization is Correct:** Chronic hyperglycemia leads to retinal capillary occlusion and widespread ischemia. This hypoxia triggers the release of **VEGF (Vascular Endothelial Growth Factor)**, which stimulates the growth of new vessels. These can occur at the optic disc (NVD), elsewhere in the retina (NVE), or on the iris (NVI/Rubeosis iridis). These vessels are prone to bleeding, leading to vitreous hemorrhage and tractional retinal detachment. 2. **Why Other Options are Incorrect:** * **Cotton Wool Spots (Soft Exudates):** These are the same entity (Option A and C). They represent micro-infarcts of the nerve fiber layer. While they indicate worsening ischemia, they are characteristic features of **Pre-proliferative NPDR**, not the defining feature of PDR. * **Papilloedema:** This refers to optic disc swelling due to increased intracranial pressure. While "Diabetic Papillopathy" exists, it is a rare, distinct entity and not a characteristic feature of PDR. **High-Yield Clinical Pearls for NEET-PG:** * **Earliest Clinical Sign of DR:** Microaneurysms (found in the Inner Nuclear Layer). * **Earliest Pathological Change:** Loss of pericytes and basement membrane thickening. * **Classification Tip:** The presence of any neovascularization or vitreous hemorrhage automatically upgrades the diagnosis to **PDR**. * **Treatment of Choice:** Pan-retinal Photocoagulation (PRP) and Anti-VEGF injections (e.g., Ranibizumab).

Question 387: What is the appropriate treatment for a patient suffering from diffuse macular retinopathy?

A. Macular ablation
B. Pan retinal photocoagulation
C. Grid pattern photocoagulation of the macula (Correct Answer)
D. Pan macular photocoagulation

Explanation: **Explanation:** The treatment of choice for **diffuse macular edema** (often seen in Diabetic Retinopathy) is **Grid pattern photocoagulation**. In diffuse macular edema, there is a generalized breakdown of the blood-retinal barrier leading to widespread leakage. Unlike focal edema (treated with focal lasers to specific microaneurysms), diffuse edema requires a "grid" of laser burns. These burns are applied to the areas of diffuse capillary leakage and non-perfusion within the macula, sparing the foveal avascular zone (FAZ). The mechanism involves stimulating the retinal pigment epithelium (RPE) to pump out excess fluid and increasing oxygenation from the choroid. **Analysis of Options:** * **Grid pattern photocoagulation (Correct):** Specifically designed to treat diffuse leakage while preserving central vision. * **Pan-retinal photocoagulation (PRP):** This is the gold standard for **Proliferative Diabetic Retinopathy (PDR)** to regress neovascularization. It is applied to the peripheral retina, not the macula. In fact, PRP can sometimes acutely worsen macular edema. * **Macular ablation:** This is not a standard clinical term or procedure; destroying the macula would lead to permanent legal blindness. * **Pan macular photocoagulation:** This is an incorrect term. Photocoagulation in the macula must be selective (Grid or Focal) to avoid damaging the fovea. **Clinical Pearls for NEET-PG:** * **CSME (Clinically Significant Macular Edema):** The landmark ETDRS study defined CSME and established laser as the primary treatment. * **Current Trend:** While Grid laser is the classic answer, **Intravitreal Anti-VEGF agents** (e.g., Ranibizumab, Aflibercept) are now often the first-line treatment in modern clinical practice for center-involving macular edema. * **Laser Settings:** Grid laser uses a small spot size (50–100 µm) and short duration to minimize damage.

Question 388: Tractional retinal detachment is seen in which of the following conditions?

A. Myopia
B. Diabetic retinopathy (Correct Answer)
C. Trauma
D. Vitreous loss after surgery

Explanation: **Explanation:** **Tractional Retinal Detachment (TRD)** is characterized by the physical pulling of the sensory retina away from the underlying retinal pigment epithelium (RPE) by contracting fibrovascular membranes in the vitreous cavity. 1. **Why Diabetic Retinopathy is Correct:** In **Proliferative Diabetic Retinopathy (PDR)**, chronic ischemia leads to the release of VEGF, causing neovascularization. These fragile new vessels grow along with a fibrous scaffold into the vitreous. Over time, this fibrovascular tissue contracts, creating mechanical "traction" that lifts the retina. This is the hallmark mechanism of TRD. 2. **Why Other Options are Incorrect:** * **Myopia:** High myopia is typically associated with **Rhegmatogenous Retinal Detachment (RRD)** due to peripheral retinal thinning (lattice degeneration) and vitreous liquefaction leading to retinal breaks. * **Trauma:** While severe trauma can lead to various types of detachment, it most commonly causes RRD (via giant retinal tears or dialysis) or exudative detachment due to inflammation. * **Vitreous loss after surgery:** This is a risk factor for RRD because the incarcerated vitreous can create a dynamic pull leading to a retinal tear (break-induced detachment). **High-Yield Clinical Pearls for NEET-PG:** * **Key Feature:** TRD is typically **concave** in configuration and has **restricted mobility** (unlike the convex, mobile configuration of RRD). * **Photopsia/Floaters:** Usually absent in TRD unless a secondary "tractional-rhegmatogenous" break occurs. * **Other causes of TRD:** Sickle cell retinopathy, Retinopathy of Prematurity (ROP), and Eales disease. * **Management:** The definitive treatment for TRD involving the macula is **Pars Plana Vitrectomy (PPV)** to membrane peel and relieve traction.

Question 389: A patient presents with a complaint of hair falling in front of the eye after blunt trauma. On examination, there is an inferior giant retinal tear. What is the immediate line of treatment?

A. Scleral buckling
B. Pan retinal photocoagulation
C. Pars plana vitrectomy with endophotocoagulation (Correct Answer)
D. Pneumatoretinopexy

Explanation: ### Explanation **Correct Option: C. Pars plana vitrectomy with endophotocoagulation** A **Giant Retinal Tear (GRT)** is defined as a retinal break extending circumferentially for **90 degrees or more** (3 clock hours). The clinical presentation of "hair falling in front of the eye" refers to floaters caused by the vitreous hemorrhage or the flapping edge of the large tear. **Why it is the correct choice:** In GRTs, the large flap of the retina tends to fold over (inverted flap) due to gravity and vitreous traction. **Pars plana vitrectomy (PPV)** is the treatment of choice because it allows the surgeon to: 1. Remove the vitreous traction. 2. Unfold the inverted retinal flap using **perfluorocarbon liquid (PFCL)**. 3. Apply **endophotocoagulation** (laser) to create a permanent adhesion. 4. Provide internal tamponade (silicone oil or gas) to keep the retina attached. **Why other options are incorrect:** * **A. Scleral buckling:** While used for simple rhegmatogenous retinal detachments, it is generally contraindicated or insufficient for GRTs because it cannot address the inverted flap and may cause the large tear to "fishmouth" or wrinkle. * **B. Pan retinal photocoagulation (PRP):** This is used for ischemic pathologies like Proliferative Diabetic Retinopathy. It does not address the mechanical detachment or the tear. * **D. Pneumatoretinopexy:** This involves injecting a gas bubble. It is only suitable for small, superior, single breaks. It cannot manage the massive traction and flap inversion seen in a 90-degree GRT. **High-Yield Clinical Pearls for NEET-PG:** * **Definition:** Tear $\geq$ 90° of the retinal circumference. * **Most common cause:** Trauma (as in this case) or High Myopia. * **Associated Condition:** Stickler syndrome (commonest systemic association). * **Surgical Step:** Use of "Heavy Water" (PFCL) is crucial during PPV to flatten the flap.

Question 390: What is the approximate area of the fundus that can be visualized with a direct ophthalmoscope?

A. 1 Disc Diameter (DD)
B. 2 Disc Diameters (DD) (Correct Answer)
C. 3 Disc Diameters (DD)
D. 4 Disc Diameters (DD)

Explanation: ### Explanation The **Direct Ophthalmoscope** is a high-magnification, low-field-of-view instrument used for detailed examination of the posterior pole. **1. Why the Correct Answer is Right:** The field of view in direct ophthalmoscopy is approximately **10° to 15°**. In clinical terms, this corresponds to an area of about **2 Disc Diameters (DD)**. While it provides high magnification (approx. 15x in emmetropes), the trade-off is a very restricted view, making it excellent for inspecting the optic disc and macula but poor for peripheral retinal screening. **2. Analysis of Incorrect Options:** * **Option A (1 DD):** This is too small. While the focus is narrow, the 10-15° angle allows for slightly more than just the optic nerve head to be visible at once. * **Options C & D (3-4 DD):** These areas are too large for a direct ophthalmoscope. To achieve a field of view of 4-5 DD (approx. 30°-40°), one would typically use **Indirect Ophthalmoscopy** (using a +20D lens). **3. High-Yield Clinical Pearls for NEET-PG:** * **Magnification:** Direct Ophthalmoscopy (15x) > Indirect Ophthalmoscopy (3-5x with +20D). * **Field of View:** Indirect Ophthalmoscopy (~8 DD) > Direct Ophthalmoscopy (~2 DD). * **Image Characteristics:** * **Direct:** Virtual, erect, and real. * **Indirect:** Real, inverted, and magnified. * **Stereopsis:** Direct ophthalmoscopy lacks stereopsis (monocular), whereas indirect ophthalmoscopy provides a 3D view (binocular). * **Myopia vs. Hypermetropia:** In high myopes, the magnification is even greater, but the field of view is further reduced.

Practice by Chapter

Retinal Anatomy and Physiology

Practice Questions

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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