Retinal Vascular Diseases — MCQs
In diabetic retinopathy, which layer of the retina is primarily affected?
Which of the following is not a feature of open-angle glaucoma?
What is not a feature of raised ICP
Cause of sudden loss of vision in a diabetic is due to:
For a neonate with threshold retinopathy of prematurity, the most appropriate treatment would be:
Which of the following statements is false regarding Eale's disease?
What is the primary complication associated with Eale's disease?
The best investigation for diagnosing Best disease is
Fluorescein dye for ophthalmological diagnosis is injected into:
What does the photostress test differentiate between?
Retinal Vascular Diseases Indian Medical PG Practice Questions and MCQs
Question 1: In diabetic retinopathy, which layer of the retina is primarily affected?
- A. Layer of rods and cones
- B. Retinal pigment epithelium
- C. Outer plexiform layer
- D. Inner nuclear layer (Correct Answer)
Explanation: ***Inner nuclear layer*** - The inner nuclear layer contains the **retinal capillary network**, which is the primary site of pathology in diabetic retinopathy. - **Microangiopathy** (pericyte loss, basement membrane thickening, endothelial cell damage) occurs in the capillaries located within this layer. - **Microaneurysms**, the earliest ophthalmoscopic sign of diabetic retinopathy, form from damaged capillaries in the inner nuclear layer. - **Diabetic macular edema (DME)** involves fluid accumulation that begins at the level of the capillaries in the inner nuclear and inner plexiform layers, then extends to the outer plexiform layer. *Outer plexiform layer* - This layer is **secondarily affected** by leakage from damaged capillaries in deeper retinal layers (inner nuclear and inner plexiform layers). - **Hard exudates** (lipid and protein deposits) accumulate in the outer plexiform layer as a consequence of capillary leakage, but this is not the primary site of vascular pathology. - The outer plexiform layer itself has minimal vasculature and is not where the initial microvascular changes occur. *Layer of rods and cones* - Photoreceptors are affected only in advanced stages of diabetic retinopathy due to chronic ischemia and secondary damage. - The primary pathology is vascular and occurs in the inner retinal layers where capillaries are located, not in the avascular photoreceptor layer. *Retinal pigment epithelium* - The RPE is not directly affected by the microvascular changes that characterize diabetic retinopathy. - RPE dysfunction is more characteristic of **age-related macular degeneration (AMD)** and other degenerative conditions. - In diabetic retinopathy, the RPE may be affected indirectly in very advanced cases but is not a primary site of pathology.
Question 2: Which of the following is not a feature of open-angle glaucoma?
- A. Elevated intraocular pressure
- B. Increased cup-to-disc ratio
- C. Gradual peripheral vision loss
- D. Pain and redness (Correct Answer)
Explanation: ***Pain and redness*** - **Open-angle glaucoma** is typically a **painless** condition, often referred to as the "silent thief of sight", because central vision is preserved until late stages. - **Pain** and **redness** are more characteristic of **acute angle-closure glaucoma** or other inflammatory eye conditions, not the chronic, progressive nature of open-angle glaucoma. *Elevated intraocular pressure* - **Elevated intraocular pressure** (IOP) is a primary risk factor and a hallmark feature of **open-angle glaucoma**, although normal-tension glaucoma exists. - Sustained high IOP can lead to **optic nerve damage** over time. *Increased cup-to-disc ratio* - An **increased cup-to-disc ratio** on examination of the optic disc is a key diagnostic feature of **open-angle glaucoma**, indicating **optic nerve damage** and atrophy. - This enlargement of the optic cup is due to the loss of nerve fibers. *Gradual peripheral vision loss* - **Gradual peripheral vision loss** is the characteristic pattern of vision loss in **open-angle glaucoma**, often unnoticed by the patient until advanced stages. - The central vision remains relatively intact until late in the disease, making early detection challenging.
Question 3: What is not a feature of raised ICP
- A. Vomiting
- B. Tachycardia (Correct Answer)
- C. Blurring of vision
- D. Hypertension
Explanation: ***Tachycardia*** - **Bradycardia**, not tachycardia, is a classic component of the **Cushing's triad**, which is a physiological response to increased ICP. - The elevated ICP triggers a reflex arc that causes a decrease in heart rate as the body attempts to maintain cerebral perfusion. *Vomiting* - **Vomiting**, especially projectile and without nausea, is a common symptom of increased ICP due to activation of the **chemoreceptor trigger zone** in the medulla. - The pressure directly stimulates this area, leading to emesis. *Blurring of vision* - **Blurring of vision** is a frequent symptom of raised ICP, often associated with **papilledema** (swelling of the optic disc). - The elevated pressure is transmitted to the optic nerve sheath, impeding venous return and causing nerve swelling. *Hypertension* - **Hypertension** is part of the **Cushing's triad** in response to increased ICP, where the body raises systemic blood pressure to overcome resistance and maintain cerebral blood flow [2]. - This is a compensatory mechanism to ensure adequate perfusion to the brain [1].
Question 4: Cause of sudden loss of vision in a diabetic is due to:
- A. Central retinal vein occlusion
- B. Neovascular glaucoma
- C. Vitreous hemorrhage (Correct Answer)
- D. Central retinal artery occlusion
Explanation: ***Vitreous hemorrhage*** - **Vitreous hemorrhage** is the **most common cause** of sudden, painless vision loss in individuals with **proliferative diabetic retinopathy** - New, fragile blood vessels (neovascularization) on the retina in diabetes can rupture, leading to bleeding into the **vitreous gel** - Patients describe sudden onset of floaters, cobwebs, or a red haze obscuring vision *Central retinal vein occlusion* - **CRVO** causes sudden, painless vision loss with **retinal hemorrhages in all four quadrants** (blood and thunder appearance) - While diabetic patients are at increased risk, vision loss is typically less profound than vitreous hemorrhage - Fundoscopy shows widespread retinal hemorrhages, dilated tortuous veins, and cotton-wool spots *Neovascular glaucoma* - **Neovascular glaucoma** causes **painful** vision loss and elevated intraocular pressure due to new vessel growth on the iris and trabecular meshwork - While associated with diabetes, it usually presents with more **gradual onset** and pain, rather than sudden, painless vision loss - Characterized by rubeosis iridis and elevated IOP *Central retinal artery occlusion* - **CRAO** causes sudden, profound, painless monocular vision loss, often described as a "curtain coming down" - While diabetic patients are at higher risk for CRAO due to generalized atherosclerosis, it typically results in a **cherry-red spot** on the macula - This is usually embolic in nature and less specifically related to diabetic retinopathy itself
Question 5: For a neonate with threshold retinopathy of prematurity, the most appropriate treatment would be:
- A. Photocoagulation (Correct Answer)
- B. Antioxidants
- C. Oxygen therapy adjustment
- D. Cryotherapy
Explanation: ***Photocoagulation*** - **Laser photocoagulation** is the most effective treatment for **threshold ROP**, as it ablates the avascular retina, preventing the growth of abnormal vessels. - This procedure aims to halt the progression of **retinal neovascularization** and reduce the risk of retinal detachment and vision loss. *Oxygen therapy adjustment* - While careful **oxygen management** is crucial in preventing and managing ROP, simply adjusting oxygen therapy is not a definitive treatment for established **threshold ROP**. - **Oxygen therapy** primarily influences the initial development of the disease rather than treating advanced stages. *Cryotherapy* - **Cryotherapy**, involving freezing of the peripheral avascular retina, was historically used but has largely been replaced by **laser photocoagulation** due to better precision and reduced collateral damage. - While effective, it is less commonly used today for **threshold ROP** compared to laser treatment. *Antioxidants* - **Antioxidants** have been investigated for their potential role in preventing ROP, but there is insufficient evidence to support their use as a primary treatment for **established threshold ROP**. - Their role is more in **prophylaxis** rather than active treatment of advanced disease.
Question 6: Which of the following statements is false regarding Eale's disease?
- A. Optic neuritis (Correct Answer)
- B. AKT is given
- C. Vitreous Hemorrhage
- D. Retinal detachment may occur
Explanation: ***Correct Answer: Optic neuritis*** - This statement is **false** because **Eale's disease** is a **peripheral retinal vasculitis** (periphlebitis) that primarily affects the **peripheral retinal veins**. - The condition does **NOT involve the optic nerve**, and **optic neuritis is NOT a recognized feature or complication** of Eale's disease. - The disease process is confined to the retinal vasculature and does not extend anteriorly to involve the optic disc or nerve in typical cases. *AKT is given* - While the exact etiology of Eale's disease remains uncertain, there is a **historical and clinical association with tuberculosis**, particularly in TB-endemic regions like India. - In clinical practice, **anti-tubercular therapy (ATT/AKT) is often empirically administered** when TB cannot be ruled out or when there is suspicion of systemic TB. - Some studies suggest ATT may help reduce inflammation and prevent recurrence in selected cases. *Vitreous Hemorrhage* - This is a **hallmark complication** of Eale's disease, particularly in stage 3 (proliferative stage). - **Recurrent vitreous hemorrhage** occurs due to rupture of fragile neovascular vessels that form in response to retinal ischemia. - It is one of the most common presentations requiring intervention. *Retinal detachment may occur* - **Tractional retinal detachment** is a recognized complication resulting from contraction of **fibrovascular proliferative membranes**. - **Rhegmatogenous retinal detachment** can also occur if vitreoretinal traction causes retinal breaks. - Both types may require surgical intervention (vitrectomy).
Question 7: What is the primary complication associated with Eale's disease?
- A. Retinal hemorrhage
- B. Vitreous hemorrhage (Correct Answer)
- C. Conjunctival hemorrhage
- D. Choroidal hemorrhage
Explanation: ***Vitreous hemorrhage*** - **Vitreous hemorrhage** is a common and often visually debilitating complication of Eale's disease, resulting from the rupture of fragile new vessels. - The proliferative stage of Eale's disease involves the development of **neovascularization** on the retina, which can bleed into the vitreous humor. *Retinal hemorrhage* - While **retinal hemorrhages** can occur in Eale's disease, they are often precursors to or components of vitreous hemorrhage, not the primary, most significant complication. - Retinal hemorrhages alone may cause less severe vision loss compared to the extensive obscuration by vitreous bleeding. *Conjunctival hemorrhage* - **Conjunctival hemorrhage** involves bleeding in the superficial layers of the eye and is not typically associated with the underlying vasculitis of Eale's disease. - This is a benign condition and not a primary complication of a retinal vascular disorder. *Choroidal hemorrhage* - **Choroidal hemorrhage** occurs beneath the retina and is usually associated with trauma, surgery, or degenerative conditions like age-related macular degeneration, not Eale's disease. - Eale's disease primarily affects the **retinal vasculature**, leading to bleeding internally into the vitreous.
Question 8: The best investigation for diagnosing Best disease is
- A. Electrooculogram (EOG) (Correct Answer)
- B. Nerve conduction study (Electroneurogram)
- C. Electroretinogram (ERG)
- D. Electroencephalogram (EEG)
Explanation: ***Electrooculogram (EOG)*** - **Best disease** (Best vitelliform macular dystrophy) is a genetic disorder affecting the retinal pigment epithelium (RPE), leading to abnormal **light-induced changes in EOG potentials**. - A **significantly reduced or absent Arden ratio** (ratio of light peak to dark trough) on the **electrooculogram (EOG)** is pathognomonic for Best disease, even in early stages when vision may be unaffected. *Nerve conduction study (Electroneurogram)* - A **nerve conduction study** measures the speed and strength of electrical signals as they travel through peripheral nerves. - This test is used for diagnosing conditions affecting **peripheral nerves**, such as neuropathies, and has no relevance to retinal disorders. *Electroretinogram (ERG)* - An **electroretinogram (ERG)** measures the electrical responses of the **photoreceptors and inner retinal cells** to light stimulation. - While ERG is useful in diagnosing various retinal disorders, it usually shows a **normal or nearly normal result in Best disease**, as the primary defect is in the RPE and not the photoreceptors themselves early in the disease course. *Electroencephalogram (EEG)* - An **electroencephalogram (EEG)** records the electrical activity of the **brain**. - It is primarily used to diagnose conditions like **epilepsy, sleep disorders**, and other neurological conditions affecting brain function, and has no utility in diagnosing retinal diseases.
Question 9: Fluorescein dye for ophthalmological diagnosis is injected into:
- A. Antecubital vein (Correct Answer)
- B. Popliteal vein
- C. Femoral vein
- D. Subclavian vein
Explanation: ***Antecubital vein*** - Fluorescein angiography requires rapid delivery of the dye into the **systemic circulation** for quick visualization of retinal and choroidal vasculature. - The **antecubital vein** is a readily accessible, large superficial vein that allows for quick and efficient intravenous dye injection. *Popliteal vein* - The popliteal vein is located behind the **knee** and is not a standard or practical site for routine intravenous injections, especially when rapid delivery to the eye is needed. - Its location makes it less accessible and potentially more uncomfortable for the patient compared to an arm vein. *Femoral vein* - The femoral vein is a large, deep vein in the **groin**, typically reserved for central venous access or specific procedures due to the increased risk of complications like infection or hematoma. - It is not routinely used for peripheral intravenous injections such as fluorescein, where a more superficial and accessible vein is preferred. *Subclavian vein* - The subclavian vein is a **central vein** located under the clavicle, accessed via a more invasive procedure, usually for central venous catheters or hemodialysis access. - It carries higher risks compared to peripheral venipuncture and is not chosen for simple diagnostic dye injections like fluorescein.
Question 10: What does the photostress test differentiate between?
- A. Macular and optic nerve diseases (Correct Answer)
- B. Retinal diseases and other conditions
- C. Cataract and retinal diseases
- D. Vitreous diseases and optic nerve diseases
Explanation: ***Macular and optic nerve diseases*** - The **photostress test** is specifically designed to differentiate between **macular (retinal) disease** and **optic nerve disease** when both present with decreased visual acuity. - The test works by exposing the eye to bright light, which bleaches photopigments in the photoreceptors, then measuring the **time to visual recovery**. - **Normal recovery (<60 seconds)** suggests intact macular function, pointing toward **optic nerve disease** as the cause of vision loss. - **Prolonged recovery (>90 seconds)** indicates **macular dysfunction**, confirming a **retinal/macular pathology**. - This is a classic bedside test to localize the pathology when examining patients with unexplained visual loss. *Retinal diseases and other conditions* - While the test does assess retinal/macular function, this option is too vague and non-specific. - The key clinical utility is the specific differentiation between **macular vs. optic nerve** pathology, not a general "other conditions." *Cataract and retinal diseases* - **Cataract** causes optical blur from lens opacity but does not prolong photostress recovery time. - The photostress test measures **photoreceptor recovery**, which is unaffected by media opacities like cataract. - This is not the primary clinical differentiation for which the test is used. *Vitreous diseases and optic nerve diseases* - **Vitreous diseases** (hemorrhage, floaters, detachment) affect light transmission but do not impact **photoreceptor recovery time**. - The test does not assess vitreous pathology and this is not its clinical indication.
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