Ocular Manifestations of Systemic Disorders — MCQs

Ocular Manifestations of Systemic Disorders Indian Medical PG Practice Questions and MCQs

Question 331: Which of the following is NOT true in ocular ischemic syndrome?

A. It occurs when carotid artery obstruction reaches 90%.
B. Dull pain in the orbital region that worsens on arising.
C. Delayed recovery of vision following bright light exposure is seen.
D. Neovascularization of the iris (NVI) is never seen. (Correct Answer)

Explanation: **Explanation:** **Ocular Ischemic Syndrome (OIS)** is a rare but vision-threatening condition caused by chronic ocular hypoperfusion, most commonly due to severe atherosclerotic stenosis of the internal or common carotid artery. **Why Option D is the Correct Answer:** Neovascularization of the iris (NVI), or rubeosis iridis, is actually a hallmark feature of OIS, occurring in approximately **60-90% of cases**. Chronic ischemia triggers the release of Vascular Endothelial Growth Factor (VEGF), leading to NVI. If left untreated, this often progresses to neovascular glaucoma (NVG). Therefore, stating that NVI is "never seen" is clinically incorrect. **Analysis of Other Options:** * **Option A:** OIS typically manifests when carotid artery stenosis reaches **90% or more**. At this level of obstruction, the perfusion pressure in the ophthalmic artery drops by approximately 50%. * **Option B:** Patients often complain of a **"vascular headache"** or dull periorbital ache (ocular angina). This pain is due to ischemia of the globe or increased intraocular pressure and is characteristically worse when the patient is upright/arising due to orthostatic changes in perfusion. * **Option C:** **Delayed recovery after light stress** (photostress test) is a classic symptom. The ischemic photoreceptors take significantly longer to regenerate visual pigments after being "bleached" by bright light. **NEET-PG High-Yield Pearls:** * **Fundus Findings:** Look for narrowed retinal arteries, dilated (but not tortuous) retinal veins, and mid-peripheral "dot-and-blot" hemorrhages. * **Differential Diagnosis:** Unlike Central Retinal Vein Occlusion (CRVO), OIS veins are dilated but **not** tortuous, and the hemorrhages are primarily in the mid-periphery. * **Systemic Importance:** OIS is a strong predictor of systemic vascular disease; the 5-year mortality rate is nearly 40%, primarily due to myocardial infarction.

Question 332: All of the following are features of asteroid hyalosis except?

A. Usually bilateral (Correct Answer)
B. Spherical calcium bodies
C. Solid vitreous
D. Usually asymptomatic

Explanation: **Explanation:** Asteroid hyalosis is a common, benign vitreous condition characterized by the accumulation of tiny, white, spherical bodies within the vitreous gel. **Why Option A is the correct answer (The "Except"):** Asteroid hyalosis is characteristically **unilateral** in about 75-80% of cases. While it can occur bilaterally, the "classic" presentation tested in exams is its unilateral nature. This distinguishes it from *Synchysis Scintillans*, which is often bilateral and associated with end-stage ocular disease. **Analysis of Incorrect Options:** * **B. Spherical calcium bodies:** These "asteroid bodies" are composed of **calcium-phospholipid complexes**. They are suspended within the vitreous framework and move with eye movements, returning to their original position (unlike the "snow globe" settling seen in synchysis scintillans). * **C. Solid vitreous:** Asteroid hyalosis typically occurs in **structurally normal, solid vitreous**. It is rarely associated with vitreous liquefaction (syneresis) or significant intraocular inflammation. * **D. Usually asymptomatic:** Despite the dramatic appearance on ophthalmoscopy (often described as a "starry night"), patients are usually asymptomatic and rarely complain of floaters. The main clinical challenge is that the bodies can obscure the clinician's view of the fundus. **High-Yield Clinical Pearls for NEET-PG:** * **Demographics:** More common in elderly patients (>60 years). * **Associations:** Classically associated with **Diabetes Mellitus**, Hypertension, and Hypercholesterolemia. * **Diagnostic Tip:** On B-scan ultrasonography, asteroid bodies appear as bright, mobile, point-like echoes within the vitreous cavity with a clear space between the echoes and the posterior globe wall. * **Treatment:** Usually none required unless the fundus view is so poor that it prevents necessary laser treatment (e.g., for diabetic retinopathy), in which case a vitrectomy is performed.

Question 333: Kayser-Fleischer ring is seen in which of the following conditions?

A. Siderosis
B. Chalcosis (Correct Answer)
C. Open angle glaucoma
D. Chemical injuries

Explanation: **Explanation:** The **Kayser-Fleischer (KF) ring** is a classic ocular sign characterized by a golden-brown or greenish-brown pigment deposition in the **Descemet’s membrane** of the cornea. It occurs due to the deposition of **copper**. * **Why Chalcosis is correct:** Chalcosis refers to the presence of intraocular copper (usually from a copper-containing foreign body). However, the KF ring is most famously associated with **Wilson’s Disease** (Hepatolenticular degeneration), where a deficiency in ceruloplasmin leads to systemic copper overload. In the context of this question, Chalcosis is the correct pathological process involving copper deposition. * **Why other options are incorrect:** * **Siderosis:** This refers to the deposition of **iron** (usually from an intraocular iron foreign body). It leads to a rusty discoloration of the iris and lens (Vossius ring) but not a KF ring. * **Open-angle glaucoma:** This is characterized by optic nerve cupping and visual field defects; it does not involve corneal pigment rings. * **Chemical injuries:** These typically cause corneal scarring, limbal stem cell deficiency, or symblepharon, rather than specific metallic ring deposits. **High-Yield Clinical Pearls for NEET-PG:** * **Location:** The KF ring starts at the **Schwalbe’s line** and extends into the Descemet’s membrane. It is first seen in the **superior pole**, then inferior, then lateral. * **Detection:** It is best visualized using a **Slit-lamp examination** (Gonioscopy can detect early deposits). * **Sunflower Cataract:** Also seen in Wilson’s Disease/Chalcosis due to copper deposition in the anterior lens capsule. * **Reversibility:** The KF ring may disappear with successful chelation therapy (e.g., D-Penicillamine).

Question 334: What does ETDRS stand for in the context of studies on diabetic retinopathy?

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

Explanation: **Explanation:** The **Early Treatment Diabetic Retinopathy Study (ETDRS)** is a landmark multicenter clinical trial that fundamentally shaped the modern management of diabetic retinopathy (DR). **1. Why Option D is Correct:** The ETDRS was designed to evaluate the timing and efficacy of photocoagulation and aspirin in patients with non-proliferative or early proliferative DR. Its primary contributions include: * **Definition of CSME:** It established the criteria for **Clinically Significant Macular Edema (CSME)**. * **Laser Guidelines:** It proved that focal/grid laser photocoagulation reduces the risk of moderate visual loss in CSME. * **Staging:** It introduced the ETDRS classification, which is the gold standard for grading DR severity. * **Visual Acuity:** It developed the **ETDRS chart**, which is more accurate than the Snellen chart for research purposes. **2. Why Other Options are Incorrect:** * **Option A & B:** While "Extended" or "Emergency" treatment might sound plausible, the study specifically focused on **Early** intervention to prevent progression to severe vision loss. * **Option C:** This is a distractor. While "rotatory drums" (like the Optokinetic Nystagmus drum) are used in ophthalmology, they have no relation to diabetic retinopathy research. **3. 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 foveal center. * **Aspirin:** The ETDRS concluded that aspirin (650mg/day) does **not** prevent the progression of retinopathy but does not increase the risk of vitreous hemorrhage either. * **The "4-2-1" Rule:** Derived from ETDRS to identify **Severe NPDR**: 4 quadrants of hemorrhages, 2 quadrants of venous beading, or 1 quadrant of IRMA.

Question 335: Von Recklinghausen disease is associated with which of the following?

A. Glaucoma
B. Optic nerve glioma
C. Neurofibroma of the lids
D. All the above (Correct Answer)

Explanation: **Explanation:** **Von Recklinghausen disease**, also known as **Neurofibromatosis Type 1 (NF1)**, is an autosomal dominant multisystem disorder caused by a mutation in the NF1 gene on **chromosome 17**. It is characterized by the proliferation of neural crest-derived cells, leading to various ocular and systemic manifestations. **Why "All the above" is correct:** * **Glaucoma:** This is a known association, occurring in about 1/300 cases. It is typically unilateral and congenital, often associated with neurofibroma of the upper eyelid or facial plexiform neurofibroma. Mechanisms include infiltration of the angle by neurofibromatous tissue or developmental angle anomalies. * **Optic Nerve Glioma:** This is a hallmark feature of NF1. These are typically low-grade pilocytic astrocytomas. They occur in approximately 15% of NF1 patients and are often bilateral when associated with the disease. * **Neurofibroma of the lids:** Plexiform neurofibromas are pathognomonic for NF1. When they involve the upper eyelid, they give rise to a characteristic **"S-shaped" deformity** and a "bag of worms" sensation on palpation. **High-Yield Clinical Pearls for NEET-PG:** 1. **Lisch Nodules:** These are the most common ocular finding in NF1. They are melanocytic hamartomas of the iris, appearing as well-defined, dome-shaped brown elevations. 2. **Sphenoid Wing Dysplasia:** A skeletal abnormality that can lead to pulsating exophthalmos. 3. **Diagnostic Mnemonic:** Remember **"17 letters in Neurofibromatosis"** for Chromosome 17. 4. **NF2 vs. NF1:** While NF1 is associated with Lisch nodules and Gliomas, **NF2** (Chromosome 22) is classically associated with **Presenile Posterior Subcapsular Cataracts** and Acoustic Neuromas.

Question 336: Which of the following are signs of uveitis?

A. Generalized conjunctival congestion
B. Circumciliary congestion
C. Cells and flare in aqueous
D. Shallow anterior chamber (Correct Answer)

Explanation: **Explanation:** In the context of this specific question, **Shallow anterior chamber** is the correct answer because it is a classic sign of **Acute Congestive Glaucoma**, which is the primary differential diagnosis for Acute Uveitis. In Uveitis, the anterior chamber depth is typically **normal or deep**. **Why the other options are characteristic of Uveitis:** * **Circumciliary Congestion (B):** This is a hallmark sign of acute anterior uveitis. It presents as a violaceous/purplish hue around the limbus due to the engorgement of anterior ciliary vessels. * **Cells and Flare (C):** These are the pathognomonic signs of active anterior uveitis. **Cells** (leukocytes) indicate active inflammation, while **Flare** (Tyndall effect) indicates protein leakage due to a breakdown of the blood-aqueous barrier. * **Generalized Conjunctival Congestion (A):** While more typical of conjunctivitis, some degree of diffuse redness can occur in uveitis, though it is less specific than circumciliary congestion. **Clinical Pearls for NEET-PG:** * **The "Big Three" Differentials:** Always differentiate Acute Uveitis from Acute Glaucoma and Acute Conjunctivitis. * **Pupil Size:** In Uveitis, the pupil is **small (miotic)** and sluggish due to sphincter spasm. In Glaucoma, it is **mid-dilated and vertically oval**. * **Intraocular Pressure (IOP):** IOP is usually **low or normal** in uveitis (due to ciliary body "stunning") but **severely elevated** in glaucoma. * **Keratic Precipitates (KPs):** These are inflammatory deposits on the corneal endothelium, a key diagnostic sign of uveitis. Large "mutton-fat" KPs suggest granulomatous uveitis (e.g., Sarcoidosis, TB).

Question 337: What is the earliest symptom of thyroid ophthalmopathy?

A. Proptosis
B. Lid retraction (Correct Answer)
C. Ophthalmoplegia
D. Diplopia

Explanation: **Explanation:** Thyroid Ophthalmopathy (Graves’ Orbitopathy) is an autoimmune inflammatory disorder associated with thyroid dysfunction. **Why Lid Retraction is the Correct Answer:** Lid retraction is the **most common and earliest clinical sign/symptom** of thyroid eye disease. It occurs due to two primary mechanisms: 1. **Sympathetic Overactivity:** Increased thyroid hormones lead to overstimulation of Müller’s muscle. 2. **Fibrosis:** Inflammation and subsequent fibrosis of the Levator Palpebrae Superioris (LPS) muscle. Clinically, this manifests as **Dalrymple’s sign** (widened palpebral fissure at rest) and contributes to the characteristic "staring look." **Analysis of Incorrect Options:** * **Proptosis (A):** While a hallmark of Graves’ disease, it usually follows lid retraction. It is caused by the accumulation of glycosaminoglycans and edema in the retrobulbar tissues, pushing the globe forward. * **Ophthalmoplegia (C):** This is a later manifestation resulting from inflammatory infiltration and fibrosis of the extraocular muscles. * **Diplopia (D):** Double vision occurs as a consequence of restricted muscle movement (Ophthalmoplegia). The **Inferior Rectus** is the most commonly involved muscle, leading to vertical diplopia. **High-Yield Clinical Pearls for NEET-PG:** * **Most common muscle involved:** Inferior Rectus (Mnemonic: **IM SL**ow – Inferior, Medial, Superior, Lateral). * **Von Graefe’s Sign:** Lid lag on downward gaze. * **Stellwag’s Sign:** Infrequent or incomplete blinking. * **Diagnosis:** Usually clinical, but CT/MRI shows **spindle-shaped enlargement** of muscle bellies with **tendon sparing**. * **Smoking:** The most significant modifiable risk factor for progression.

Question 338: Diabetic retinopathy is most likely to present with which of the following patient profiles?

A. Insulin-dependent diabetes mellitus (IDDM) with 2 years duration
B. Non-insulin-dependent diabetes mellitus (NIDDM) with 2 years duration (Correct Answer)
C. Juvenile diabetes
D. Gestational diabetes

Explanation: ### Explanation The development of Diabetic Retinopathy (DR) is primarily dependent on the **duration of the disease**. However, the clinical presentation differs significantly between Type 1 (IDDM) and Type 2 (NIDDM) diabetes due to the timing of diagnosis. **Why Option B is Correct:** In **NIDDM (Type 2)**, the onset of hyperglycemia is often insidious and asymptomatic. Patients may have undiagnosed diabetes for years before clinical detection. Consequently, approximately **20% of NIDDM patients** already have some degree of retinopathy at the time of diagnosis. Therefore, seeing DR within just **2 years** of diagnosis is a common clinical profile for NIDDM. **Why Other Options are Incorrect:** * **Option A (IDDM):** In Type 1 diabetes, the onset is acute and the date of diagnosis usually coincides with the actual onset of the disease. Retinopathy is almost never present at diagnosis and rarely develops within the first 5 years. It typically takes 10–15 years for DR to manifest in these patients. * **Option C (Juvenile Diabetes):** This is a form of IDDM. Retinopathy is extremely rare before puberty, regardless of the duration of the disease, due to protective hormonal factors. * **Option D (Gestational Diabetes):** While pregnancy can aggravate pre-existing DR, isolated gestational diabetes (onset during pregnancy) rarely lasts long enough to cause structural microvascular changes like retinopathy. **High-Yield Clinical Pearls for NEET-PG:** * **Most important risk factor for DR:** Duration of diabetes. * **First clinical sign of DR:** Microaneurysms (located in the inner nuclear layer). * **First pathological sign:** Loss of pericytes and thickening of the basement membrane. * **Screening Guidelines:** * **Type 1:** First screen 5 years after diagnosis. * **Type 2:** First screen **at the time of diagnosis**. * **Pregnancy:** Screen in the first trimester and follow up every 3 months.

Question 339: Vortex vein invasion is commonly seen in which of the following ocular conditions?

A. Retinoblastoma
B. Malignant melanoma (Correct Answer)
C. Optic nerve gliomas
D. Medulloepitheliomas

Explanation: **Explanation:** **Malignant Melanoma** of the choroid is the most common primary intraocular malignancy in adults. The choroid is a highly vascular layer, and its venous drainage occurs primarily through the **vortex veins** (usually 4–7 in number). Because uveal melanomas originate within this vascular bed, they frequently utilize these pre-existing anatomical channels for extraocular extension. Invasion of the vortex veins is a classic histopathological feature and a significant prognostic factor, as it facilitates hematogenous spread, most commonly to the liver. **Why the other options are incorrect:** * **Retinoblastoma:** This is a neurosensory retinal tumor. Its primary route of extraocular spread is via direct invasion of the **optic nerve** (into the subarachnoid space) or through the sclera into the orbit. It does not typically prioritize vortex vein invasion. * **Optic Nerve Gliomas:** These are benign tumors of the optic nerve (often associated with NF-1). They spread along the optic nerve sheath toward the chiasm rather than invading the intraocular venous system. * **Medulloepitheliomas:** These rare tumors arise from the ciliary body epithelium. While they can be locally invasive, they do not show the characteristic predilection for vortex vein invasion seen in choroidal melanomas. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site of metastasis:** For Uveal Melanoma, it is the **Liver** (90% of cases). * **Investigation of choice:** Ocular B-scan Ultrasound (shows "collar-stud" or mushroom appearance and internal excavations). * **Risk Factors (TFSOM):** **T**hickness >2mm, **F**luid (subretinal), **S**ymptoms, **O**range pigment (lipofuscin), **M**argin near optic disc. * **Histology:** Callender classification (Spindle A, Spindle B, and Epithelioid cells—Epithelioid has the worst prognosis).

Question 340: Thyroid eye disease is due to what condition?

A. Thyrotoxicosis (Correct Answer)
B. Hypothyroidism
C. Euthyroidism
D. Hashimoto's disease

Explanation: **Explanation:** Thyroid Eye Disease (TED), also known as Graves' Ophthalmopathy, is an autoimmune inflammatory disorder most commonly associated with **Thyrotoxicosis** (Option A). The underlying mechanism involves autoantibodies (TSH-receptor antibodies) that cross-react with receptors on orbital fibroblasts. This leads to the deposition of glycosaminoglycans, adipogenesis, and extraocular muscle edema, resulting in the characteristic proptosis and lid retraction. **Analysis of Options:** * **Thyrotoxicosis (Correct):** Approximately 90% of TED cases occur in patients with Graves' hyperthyroidism. It is the most frequent systemic association. * **Hypothyroidism (Incorrect):** While TED can occur in hypothyroid states (about 1% of cases), it is not the primary or most common cause. * **Euthyroidism (Incorrect):** "Euthyroid Graves' Disease" occurs in about 5-10% of patients who have ocular signs without clinical or biochemical thyroid dysfunction at the time of diagnosis. * **Hashimoto's Disease (Incorrect):** Although Hashimoto’s is an autoimmune thyroid condition, it is much less frequently associated with significant ophthalmopathy compared to Graves' disease. **Clinical Pearls for NEET-PG:** * **Most common cause of both unilateral and bilateral proptosis** in adults is Thyroid Eye Disease. * **NOSPECS Classification:** Used to grade severity (N: No signs/symptoms, O: Only signs, S: Soft tissue involvement, P: Proptosis, E: Extraocular muscle involvement, C: Corneal involvement, S: Sight loss). * **Muscle Involvement Sequence (IM SLOW):** Inferior rectus (most common) > Medial rectus > Superior rectus > Lateral rectus. * **Dalrymple Sign:** Widening of the palpebral fissure due to upper lid retraction. * **Von Graefe’s Sign:** Lid lag on downgaze.

Practice by Chapter

Diabetes Mellitus

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Hypertension

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Autoimmune Disorders

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Thyroid Disease

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HIV and AIDS

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Hematological Disorders

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Neurological Disorders

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Dermatological Conditions

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Pregnancy-Related Eye Changes

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Metabolic Disorders

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Ocular Toxicity of Systemic Medications

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Infectious Systemic Diseases

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