Ocular Manifestations of Systemic Disorders Practice Questions

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

Neovascularization of the iris (NVI) is never seen.. **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.

Q: All of the following are features of asteroid hyalosis except?

Usually bilateral. **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.

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

Chalcosis. **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).

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

All the above. **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.

Q: Which of the following are signs of uveitis?

Shallow anterior chamber. **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).

Q: What is the earliest symptom of thyroid ophthalmopathy?

Lid retraction. **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.

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

Malignant melanoma. **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).

Q: Thyroid eye disease is due to what condition?

Thyrotoxicosis. **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.

Question 1

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

Accepted Answer

Neovascularization of the iris (NVI) is never seen.

Answer

It occurs when carotid artery obstruction reaches 90%.

Answer

Dull pain in the orbital region that worsens on arising.

Answer

Delayed recovery of vision following bright light exposure is seen.

Question 2

All of the following are features of asteroid hyalosis except?

Accepted Answer

Usually bilateral

Answer

Spherical calcium bodies

Answer

Solid vitreous

Answer

Usually asymptomatic

Question 3

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

Accepted Answer

Chalcosis

Answer

Siderosis

Answer

Open angle glaucoma

Answer

Chemical injuries

Question 4

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

Accepted Answer

Early treatment for diabetic retinopathy study

Answer

Extended therapy for diabetic retinopathy & its study

Answer

Emergency treatment for diabetic retinopathy and study

Answer

Eye testing or rotatory drum & its study

Question 5

Von Recklinghausen disease is associated with which of the following?

Accepted Answer

All the above

Answer

Glaucoma

Answer

Optic nerve glioma

Answer

Neurofibroma of the lids

Question 6

Which of the following are signs of uveitis?

Accepted Answer

Shallow anterior chamber

Answer

Generalized conjunctival congestion

Answer

Circumciliary congestion

Answer

Cells and flare in aqueous

Question 7

What is the earliest symptom of thyroid ophthalmopathy?

Accepted Answer

Lid retraction

Answer

Proptosis

Answer

Ophthalmoplegia

Answer

Diplopia

Question 8

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

Accepted Answer

Non-insulin-dependent diabetes mellitus (NIDDM) with 2 years duration

Answer

Insulin-dependent diabetes mellitus (IDDM) with 2 years duration

Answer

Juvenile diabetes

Answer

Gestational diabetes

Question 9

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

Accepted Answer

Malignant melanoma

Answer

Retinoblastoma

Answer

Optic nerve gliomas

Answer

Medulloepitheliomas

Question 10

Thyroid eye disease is due to what condition?

Accepted Answer

Thyrotoxicosis

Answer

Hypothyroidism

Answer

Euthyroidism

Answer

Hashimoto's disease

Ocular Manifestations of Systemic Disorders — MCQs

Ocular Manifestations of Systemic Disorders — MCQs

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