Diseases of the Retina Practice Questions

Q: Which of the following conditions is associated with angioid streaks?

Sickle cell disease. **Explanation:** **Angioid streaks** are jagged, radiating cracks in a thickened, calcified, and brittle **Bruch’s membrane**. On ophthalmoscopy, they appear as dark, reddish-brown streaks radiating from the peripapillary area, resembling blood vessels. **Why Sickle Cell Disease is correct:** Sickle cell disease (and other hemoglobinopathies like Thalassemia) is a classic systemic cause of angioid streaks. The underlying mechanism involves chronic hemolysis leading to iron deposition (hemosiderosis) in Bruch’s membrane, which makes it brittle and prone to dehiscence. **Analysis of Incorrect Options:** * **A. Sturge-Weber Syndrome:** Characterized by "tomato catsup" fundus (diffuse choroidal hemangioma) and glaucoma, but not angioid streaks. * **C. Pseudoexfoliation Syndrome:** A systemic condition where fibrillar material deposits on the anterior segment (lens capsule, iris), leading to secondary open-angle glaucoma. It does not affect Bruch’s membrane. * **D. Septo-optic Dysplasia (de Morsier Syndrome):** A congenital malformation involving optic nerve hypoplasia and midline brain defects; it is unrelated to Bruch’s membrane pathology. **High-Yield Clinical Pearls (NEET-PG):** To remember the causes of angioid streaks, use the mnemonic **PEPSI**: * **P** – **P**seudoxanthoma elasticum (Most common cause; look for "plucked chicken skin" appearance). * **E** – **E**hlers-Danlos syndrome. * **P** – **P**aget’s disease of bone. * **S** – **S**ickle cell disease (and other hemoglobinopathies). * **I** – **I**diopathic. **Note:** The most vision-threatening complication of angioid streaks is **Choroidal Neovascularization (CNV)**, which can lead to subretinal hemorrhage and scarring.

Q: Which of the following conditions may masquerade as uveitis?

Retinal detachment. **Explanation:** **Retinal Detachment (RD)**, specifically long-standing or chronic rhegmatogenous retinal detachment, is a well-known **masquerade syndrome**. In these cases, degenerating photoreceptor outer segments migrate into the vitreous and anterior chamber. These cells, along with associated pigment (Schwartz-Matsuo syndrome), can be mistaken for inflammatory "cells" and "flare," leading to a misdiagnosis of chronic uveitis. Furthermore, chronic RD can cause hypotony and mild ciliary congestion, further mimicking the clinical picture of iridocyclitis. **Analysis of Incorrect Options:** * **Choroidal detachment:** While it presents with low intraocular pressure (hypotony), it typically follows trauma or surgery and presents with characteristic "kissing choroidals" on imaging, rather than mimicking intraocular inflammation. * **Age-related macular degeneration (AMD):** This is a degenerative condition of the macula. While exudative AMD involves subretinal fluid/hemorrhage, it does not typically present with anterior or vitreous chamber cells that mimic uveitis. * **Central retinal artery occlusion (CRAO):** This is a vascular emergency presenting with sudden, painless loss of vision and a "cherry-red spot." It does not involve inflammatory-like cellular debris. **High-Yield Clinical Pearls for NEET-PG:** 1. **Schwartz-Matsuo Syndrome:** A specific masquerade where chronic RD leads to secondary glaucoma because photoreceptor outer segments block the trabecular meshwork. 2. **Other Masquerades:** Retinoblastoma (most common in children), Intraocular Lymphoma (most common in elderly), and Malignant Melanoma. 3. **Key Differentiator:** If a patient with suspected "uveitis" has low IOP (hypotony) and does not respond to steroids, always perform a dilated fundus exam to rule out Retinal Detachment.

Q: A baby is born prematurely at 28 weeks gestational age with a birth weight of 1200 g. Ventilation with high partial pressures of oxygen is started, but the neonatologist is concerned about the possible development of retinopathy of prematurity. What is the underlying mechanism by which this retinal lesion may develop?

Inappropriate vascular proliferation. **Explanation:** **Retinopathy of Prematurity (ROP)** is a vasoproliferative disorder affecting the incomplete vascularization of the retina in preterm infants. 1. **Mechanism of the Correct Answer (B):** The pathophysiology occurs in two phases. Initially, high supplemental oxygen causes **hyperoxia**, which leads to the downregulation of Vascular Endothelial Growth Factor (VEGF) and the cessation of normal vessel growth (vaso-obliteration). As the infant matures or is moved to room air, the peripheral non-vascularized retina becomes **hypoxic**. This triggers a massive compensatory release of VEGF, leading to **inappropriate vascular proliferation** (neovascularization). These fragile new vessels can cause vitreous hemorrhage, tractional retinal detachment, and blindness. 2. **Why Other Options are Incorrect:** * **A & C:** ROP primarily affects the retinal vasculature, not the neural elements like ganglion cells or the optic nerve. While advanced detachment can lead to secondary neural damage, it is not the underlying mechanism. * **D:** Pigment deposition is characteristic of conditions like Retinitis Pigmentosa or post-inflammatory scarring, not the acute proliferative phase of ROP. **High-Yield Clinical Pearls for NEET-PG:** * **Screening Criteria (India/RBSK):** Birth weight **<2000g** or Gestational Age **<34 weeks**, or infants with a stormy neonatal course. * **Timing:** First screening should be done at **4 weeks** (30 days) of life or **2 weeks** if born <28 weeks. * **Plus Disease:** Characterized by arterial tortuosity and venous dilatation in the posterior pole; it indicates active, severe ROP. * **Treatment:** Laser photocoagulation (Gold Standard) or Anti-VEGF injections (e.g., Ranibizumab).

Q: Angioid streaks are seen in which of the following conditions?

Pseudoxanthoma elasticum. **Explanation:** **Angioid streaks** are irregular, jagged, radiating lines deep to the retina that resemble blood vessels. They represent **linear dehiscences (cracks) in a thickened, calcified, and brittle Bruch’s membrane**. 1. **Why Pseudoxanthoma Elasticum (PXE) is correct:** PXE (Grönblad-Strandberg syndrome) is the most common systemic association of angioid streaks, occurring in approximately 80% of patients. In this condition, progressive calcification of elastic fibers makes Bruch’s membrane fragile, leading to the characteristic cracks. 2. **Why the other options are incorrect:** * **Tuberous Sclerosis:** Characterized by **astrocytic hamartomas** (mulberry lesions) of the retina or optic nerve head, not Bruch’s membrane pathology. * **Sturge-Weber Syndrome:** Classically associated with **diffuse choroidal hemangiomas** ("tomato catsup" fundus) and glaucoma, but not angioid streaks. * **Septo-optic Dysplasia (de Morsier Syndrome):** A congenital anomaly involving **optic nerve hypoplasia**, midline brain defects, and pituitary deficiencies. **High-Yield Clinical Pearls for NEET-PG:** * **Mnemonic for Angioid Streaks (PEPSI):** * **P** – **P**seudoxanthoma elasticum (Most common) * **E** – **E**hlers-Danlos syndrome * **P** – **P**aget’s disease of bone * **S** – **S**ickle cell anemia (and other hemoglobinopathies) * **I** – **I**diopathic * **Clinical Significance:** The primary vision-threatening complication of angioid streaks is the development of **Choroidal Neovascularization (CNVM)**. * **PXE Skin Finding:** Look for "plucked chicken skin" appearance (yellowish papules on the neck/axilla).

Q: Amaurosis fugax is:

Transient ischemic attack of the retina. **Explanation:** **Amaurosis Fugax** (Latin for "fleeting darkness") refers to a sudden, painless, and temporary loss of vision in one eye. It is essentially a **Transient Ischemic Attack (TIA) of the retina**, typically caused by an embolus (most commonly Hollenhorst plaques from the carotid artery) that temporarily occludes the retinal circulation. * **Why Option A is correct:** The underlying mechanism is transient hypoperfusion. When an embolus lodges in the retinal artery, it causes ischemia; once the embolus dissolves or moves distally, perfusion is restored, and vision returns—usually within seconds to minutes. It is a critical warning sign of an impending stroke or Central Retinal Artery Occlusion (CRAO). **Why the other options are incorrect:** * **Option B:** Demyelinating disease (e.g., Multiple Sclerosis) causes **Optic Neuritis**, which presents with subacute, painful vision loss and a Marcus Gunn pupil, not transient episodes. * **Option C:** Retinal detachment in diabetes is usually **Tractional RD**, which causes progressive, permanent vision loss or "floaters," not transient episodes. * **Option D:** **Coat’s disease** is an idiopathic condition characterized by telangiectatic retinal vessels and exudation, typically seen in young males; it does not present as transient vision loss. **High-Yield Clinical Pearls for NEET-PG:** 1. **Classic Presentation:** Patients describe a "curtain coming down" over one eye that lifts after a few minutes. 2. **Most Common Source:** Carotid artery stenosis (Atherosclerosis). 3. **Hollenhorst Plaques:** These are bright, refractive cholesterol emboli seen at retinal vessel bifurcations during fundoscopy. 4. **Management:** Immediate carotid Doppler ultrasound and cardiovascular workup are mandatory to prevent a major stroke.

Q: What is the resuscitation time of the human retina following ischemia?

1 to 2 hours. **Explanation:** The **resuscitation time** refers to the maximum duration of ischemia after which an organ or tissue can still recover its function upon reperfusion. **Why 1 to 2 hours is correct:** The retina is an extension of the central nervous system (CNS) and has a high metabolic demand. However, unlike the brain—which suffers irreversible damage within 4–6 minutes of total ischemia—the retina is relatively more resistant to ischemic injury. Experimental and clinical studies (notably by Hayreh et al.) have shown that the primate retina can tolerate complete ischemia for up to **90 to 100 minutes** without suffering permanent functional loss. Beyond this 1 to 2-hour window, irreversible damage to the ganglion cells and photoreceptors occurs, leading to permanent blindness. **Analysis of Incorrect Options:** * **15 to 20 minutes (Option D):** This is too short. While significant metabolic changes occur, the structural integrity and potential for recovery remain intact beyond this period. * **30 to 45 minutes (Options A & B):** These timeframes represent periods where recovery is highly likely, but they do not represent the *maximum* limit of the retina's resilience. **Clinical Pearls for NEET-PG:** * **Central Retinal Artery Occlusion (CRAO):** This is an ophthalmic emergency. The "1 to 2-hour" window is the rationale behind aggressive immediate management (e.g., ocular massage, anterior chamber paracentesis) to restore blood flow. * **Cherry Red Spot:** A classic finding in CRAO, where the pale, edematous retina contrasts with the intact choroidal circulation visible through the thin fovea. * **Brain vs. Retina:** Always remember that while both are neural tissues, the retina's resuscitation time (up to 100 mins) is significantly longer than the brain's (4–6 mins).

Q: Which of the following statements is NOT true about retinoblastoma?

More common in males. **Explanation:** Retinoblastoma is the most common primary intraocular malignancy of childhood, arising from the neurosensory retina. **Why Option C is the correct answer (The False Statement):** Retinoblastoma shows **no gender or racial predilection**. It affects males and females equally. Therefore, the statement that it is "more common in males" is incorrect. **Analysis of other options:** * **Option A (Bilateral in 20-30%):** This is a true statement. Approximately 25-30% of cases are bilateral and are typically associated with germline mutations in the *RB1* gene on chromosome 13q14. * **Option B (Age group 1-5 years):** This is true. Most cases are diagnosed before the age of 5. Bilateral cases usually present earlier (average 12 months), while unilateral cases present slightly later (average 24 months). * **Option D (Leukocoria is the earliest symptom):** This is true. **Leukocoria** (white pupillary reflex or "amaurotic cat's eye reflex") is the most common presenting sign (60%), followed by **strabismus** (20%). **High-Yield Clinical Pearls for NEET-PG:** * **Genetics:** Follows Knudson’s "Two-hit hypothesis." * **Pathology:** Characterized by **Flexner-Wintersteiner rosettes** (highly specific), Homer-Wright rosettes, and fleurettes. * **Calcification:** Dystrophic calcification is a hallmark; it is seen on CT scans and helps differentiate it from Coats' disease. * **Classification:** The International Classification for Intraocular Retinoblastoma (ICIR) is used to guide management (Groups A to E). * **Trilateral Retinoblastoma:** Bilateral retinoblastoma associated with a pineal gland tumor (pineoblastoma).

Q: Advantages of binocular indirect ophthalmoscopy are all except?

Opacities in the media are visualized. **Explanation:** The Indirect Ophthalmoscope (BIO) is a cornerstone of retinal examination. The correct answer is **C** because the ability to visualize opacities in the media is a characteristic advantage of **Direct Ophthalmoscopy**, not Indirect. **1. Why Option C is the correct answer (The Exception):** In Indirect Ophthalmoscopy, the high-intensity light source and the condensing lens (e.g., +20D) are designed to "bypass" or "cut through" mild to moderate media opacities (like cataracts or vitreous hemorrhage) to view the fundus. Conversely, **Direct Ophthalmoscopy** is superior for identifying media opacities because they appear as dark shadows against the red glow (Retro-illumination). **2. Analysis of Incorrect Options (Advantages of BIO):** * **A. Peripheral retina visualization:** Through the use of **scleral indentation**, BIO allows the examiner to view the retina up to the *Ora Serrata*, which is impossible with a direct ophthalmoscope. * **B. Wider retinal field:** BIO provides a wide field of view (approx. 37° or 8 disc diameters with a 20D lens), compared to the narrow 10-15° field of direct ophthalmoscopy. * **D. Brighter images:** The BIO uses a much stronger illumination system, which is essential for detailed fundus evaluation even in patients with hazy media. **High-Yield Clinical Pearls for NEET-PG:** * **Image Characteristics:** The image in BIO is **Real, Inverted, and Magnified** (approx. 3x with a 20D lens). * **Principle:** It works on the principle of making the eye highly myopic by placing a strong convex lens in front of it. * **Stereopsis:** Because it is binocular, BIO provides excellent **depth perception**, making it the gold standard for diagnosing Retinal Detachment and tumors.

Question 1

Which of the following conditions is associated with angioid streaks?

Accepted Answer

Sickle cell disease

Answer

Sturge-Weber's syndrome

Answer

Pseudoexfoliation syndrome

Answer

Septo-optic dysplasia

Question 2

Which of the following conditions may masquerade as uveitis?

Accepted Answer

Retinal detachment

Answer

Choroidal detachment

Answer

Age-related macular degeneration

Answer

Central retinal artery occlusion

Question 3

A baby is born prematurely at 28 weeks gestational age with a birth weight of 1200 g. Ventilation with high partial pressures of oxygen is started, but the neonatologist is concerned about the possible development of retinopathy of prematurity. What is the underlying mechanism by which this retinal lesion may develop?

Accepted Answer

Inappropriate vascular proliferation

Answer

Ganglion cell degeneration

Answer

Optic nerve degeneration

Answer

Pigment deposition in retina

Question 4

Angioid streaks are seen in which of the following conditions?

Accepted Answer

Pseudoxanthoma elasticum

Answer

Tuberous sclerosis

Answer

Sturge-Weber syndrome

Answer

Septo-optic dysplasia

Question 5

Amaurosis fugax is:

Accepted Answer

Transient ischemic attack of the retina

Answer

Demyelinating disease of the optic nerve

Answer

Retinal detachment in diabetic retinopathy

Answer

Coat's disease

Question 6

Which of the following stages of Retinopathy of Prematurity (ROP) can be managed with observation alone?

Accepted Answer

Stage 1, Zone 3 ROP

Answer

Aggressive posterior ROP

Answer

Stage 4 ROP

Answer

Stage 2, Zone 1 with Plus disease

Question 7

What is the resuscitation time of the human retina following ischemia?

Accepted Answer

1 to 2 hours

Answer

30 minutes

Answer

45 minutes

Answer

15 to 20 minutes

Question 8

Which of the following statements is NOT true about retinoblastoma?

Accepted Answer

More common in males

Answer

Bilateral in 20-30% of cases

Answer

Affects the age group of 1-5 years

Answer

Leukocoria is the earliest symptom

Question 9

Advantages of binocular indirect ophthalmoscopy are all except?

Accepted Answer

Opacities in the media are visualized

Answer

Peripheral retina can be visualized

Answer

Wider retinal field visualized

Answer

More bright images are seen

Question 10

What is the primary objective of the MARINA trial?

Accepted Answer

To investigate the role of ranibizumab in the treatment of age-related macular degeneration (ARMD).

Answer

To evaluate the role of new antibiotics in treating fungal ulcers.

Answer

To assess the efficacy of Anti-VEGF agents in managing diabetic retinopathy.

Answer

To determine the role of Aflibercept in wet age-related macular degeneration (ARMD).

Diseases of the Retina — MCQs

Diseases of the Retina — MCQs

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