Ocular Manifestations of Systemic Disorders — MCQs

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

Question 151: What is the most common ocular complication of Diphtheria?

A. Paralysis of accommodation (Correct Answer)
B. External ophthalmoplegia
C. Sluggish pupillary reflex
D. Optic neuritis

Explanation: **Explanation:** The correct answer is **Paralysis of accommodation**. **1. Why it is correct:** Diphtheria is caused by *Corynebacterium diphtheriae*, which produces a potent exotoxin. This toxin has a predilection for nervous tissue (neurotoxicity). The most frequent ocular manifestation is **post-diphtheritic paralysis**, specifically affecting the **ciliary muscle**. This leads to a loss of accommodation, causing blurred near vision while distance vision remains intact. It typically occurs 2–4 weeks after the throat infection and is usually bilateral and symmetrical. **2. Why other options are incorrect:** * **External ophthalmoplegia:** While the toxin can affect cranial nerves (III, IV, and VI) leading to paralysis of extraocular muscles, this occurs much less frequently than ciliary muscle involvement. * **Sluggish pupillary reflex:** In Diphtheria, there is a classic **light-near dissociation**. The paralysis affects accommodation (ciliary muscle), but the **pupillary reflex to light is usually preserved**. This distinguishes it from other conditions like Adie’s pupil. * **Optic neuritis:** This is an extremely rare complication of Diphtheria and is not considered a characteristic or common feature. **3. Clinical Pearls for NEET-PG:** * **Timeline:** Ocular symptoms usually appear during the convalescent stage (2nd to 4th week). * **Prognosis:** Post-diphtheritic paralysis of accommodation is almost always **reversible** and recovers completely within 4–6 weeks. * **Differential Diagnosis:** If a patient presents with sudden loss of accommodation and preserved light reflex, always consider Diphtheria (especially in pediatric cases with a history of sore throat) or Botulism. * **Key Association:** Remember, Diphtheria = **Accommodation gone, Light reflex on.**

Question 152: A recurrent chalazion should be subjected to histopathologic evaluation to exclude the possibility of which of the following?

A. Squamous cell carcinoma
B. Sebaceous cell carcinoma (Correct Answer)
C. Malignant melanoma
D. Basal cell carcinoma

Explanation: **Explanation:** A **chalazion** is a chronic granulomatous inflammation of the Meibomian glands. While usually benign, a **recurrent chalazion** at the same site or one that appears atypical (e.g., associated with loss of lashes or thickening of the lid margin) is a classic "masquerade" sign for **Sebaceous Cell Carcinoma (SGC)**. 1. **Why Sebaceous Cell Carcinoma is correct:** SGC arises from the Meibomian glands (modified sebaceous glands). Because it presents as a firm, painless nodule, it frequently mimics a chalazion. In elderly patients, any recurrent chalazion must be biopsied to rule out SGC, as this is a highly malignant tumor with a tendency for pagetoid spread (migration of tumor cells into the epithelium). 2. **Why other options are incorrect:** * **Squamous Cell Carcinoma (SCC):** While it is a common eyelid malignancy, it typically presents as an ulcerated plaque or a nodule with scaling/crusting, rather than mimicking a deep-seated Meibomian cyst. * **Malignant Melanoma:** This presents as a pigmented lesion with irregular borders. It does not clinically resemble a lipogranulomatous inflammatory cyst like a chalazion. * **Basal Cell Carcinoma (BCC):** This is the most common eyelid tumor (usually on the lower lid). It typically presents as a "pearly" nodule with telangiectasia or a "rodent ulcer," not as a recurrent internal chalazion. **High-Yield Clinical Pearls for NEET-PG:** * **Masquerade Syndrome:** SGC is the most common tumor to masquerade as chronic blepharoconjunctivitis or recurrent chalazion. * **Biopsy Gold Standard:** For suspected SGC, a **full-thickness wedge biopsy** is preferred. * **Staining:** If SGC is suspected, **Oil Red O** or **Sudan IV** stains are used on fresh/frozen tissue to identify lipid content. * **Most Common Site:** Unlike BCC (lower lid), SGC is more common in the **upper lid** because Meibomian glands are more numerous there.

Question 153: Ocular complications in herpes zoster ophthalmicus usually appear when?

A. At the subsidence of skin eruptions (Correct Answer)
B. Simultaneous with cutaneous lesions
C. Two days after the skin eruptions
D. During the stage of erythematous skin lesions

Explanation: **Explanation:** **Herpes Zoster Ophthalmicus (HZO)** is caused by the reactivation of the Varicella-Zoster virus (VZV) in the trigeminal ganglion, specifically involving the ophthalmic division ($V_1$). **Why Option A is Correct:** The ocular manifestations of HZO typically follow a biphasic pattern. While some minor surface issues can occur early, the significant sight-threatening complications (such as stromal keratitis, anterior uveitis, and scleritis) are primarily **immune-mediated**. These complications usually manifest **at the subsidence of skin eruptions**, typically 1 to 3 weeks after the initial rash has begun to crust and heal. This delay occurs because the ocular damage is often a result of the host's delayed hypersensitivity reaction to the viral antigen rather than direct viral replication. **Why Other Options are Incorrect:** * **Options B, C, and D:** During the erythematous and active vesicle stages (simultaneous or within 2 days), the clinical picture is dominated by dermatological symptoms (pain, tingling, and vesicular rash). While follicular conjunctivitis may occur early, the classic "ocular complications" referred to in standard ophthalmic teaching (like disciform keratitis or uveitis) are late-onset phenomena. **High-Yield Clinical Pearls for NEET-PG:** * **Hutchinson’s Rule:** Involvement of the tip, side, or root of the nose (supplied by the external nasal branch of the nasociliary nerve) is a strong predictor of ocular involvement. * **Pseudodendrites:** HZO causes "stuck-on" mucous plaques (pseudodendrites) which lack terminal bulbs, unlike the true dendrites of Herpes Simplex. * **Treatment:** Oral Acyclovir (800 mg 5 times daily for 7–10 days) is most effective when started within 72 hours of the rash. * **Most common late complication:** Post-herpetic neuralgia.

Question 154: What is the most common cause of rubeosis iridis?

A. Tumor
B. Central retinal artery occlusion
C. Radiation retinopathy
D. Diabetic retinopathy (Correct Answer)

Explanation: **Explanation:** **Rubeosis iridis** (neovascularization of the iris) is a serious condition where new, fragile blood vessels form on the surface of the iris in response to severe, chronic retinal ischemia. **1. Why Diabetic Retinopathy is correct:** The underlying mechanism is **retinal hypoxia**, which triggers the release of **Vascular Endothelial Growth Factor (VEGF)**. VEGF diffuses into the anterior segment, stimulating angiogenesis on the iris and in the iridocorneal angle. **Diabetic Retinopathy (DR)**, specifically Proliferative Diabetic Retinopathy (PDR), is statistically the **most common cause** of rubeosis iridis worldwide due to the high prevalence of the disease. **2. Analysis of Incorrect Options:** * **Central Retinal Artery Occlusion (CRAO):** While CRAO causes ischemia, it is a less common cause of rubeosis (approx. 1-5% of cases) compared to Central Retinal Vein Occlusion (CRVO) or DR. * **Tumors:** Intraocular tumors like retinoblastoma or uveal melanoma can cause rubeosis via inflammation or ischemia, but they are rare etiologies. * **Radiation Retinopathy:** This can lead to ischemia and subsequent rubeosis, but it is a niche cause seen only after radiotherapy for ocular or orbital tumors. **3. High-Yield Clinical Pearls for NEET-PG:** * **Top 3 Causes:** 1. Diabetic Retinopathy (Most common), 2. Central Retinal Vein Occlusion (Ischemic type), 3. Carotid Artery Occlusive Disease. * **Complication:** Rubeosis iridis often leads to **Neovascular Glaucoma (NVG)** as the new vessels and associated fibrous membranes contract and "zip up" the angle (peripheral anterior synechiae). * **Management:** The mainstay of treatment is **Pan-retinal Photocoagulation (PRP)** to reduce the hypoxic drive, often supplemented by anti-VEGF injections.

Question 155: What is the most common cause of trichiasis?

A. Stye
B. Trachoma (Correct Answer)
C. Blepharitis
D. Congenital causes

Explanation: **Explanation:** **Trichiasis** is a condition where the eyelashes are misdirected and rub against the cornea or conjunctiva. **Why Trachoma is the correct answer:** Globally, **Trachoma** (caused by *Chlamydia trachomatis* serotypes A, B, Ba, and C) is the most common cause of cicatricial (scarring) trichiasis. Chronic follicular conjunctivitis leads to subconjunctival fibrosis (Arlt’s line). This scarring causes the eyelid margin to roll inward (entropion) or simply misdirects the follicles, leading to trichiasis. It remains a leading cause of preventable blindness worldwide due to the resulting corneal opacification. **Analysis of Incorrect Options:** * **Stye (Hordeolum Externum):** This is an acute suppurative inflammation of the Zeis or Moll glands. While it causes localized swelling and pain, it rarely results in permanent, widespread misdirection of lashes. * **Blepharitis:** Chronic marginal blepharitis is a very common cause of trichiasis in clinical practice, but epidemiologically and in the context of standard medical examinations, Trachoma is cited as the leading cause due to its global impact on blindness. * **Congenital causes:** These are rare and usually present as **Epiblepharon** (an extra fold of skin pushing lashes inward) rather than true trichiasis. **High-Yield Clinical Pearls for NEET-PG:** * **Distinction:** Trichiasis is misdirected lashes with a normal lid margin; **Entropion** is the inward turning of the lid margin itself. * **SAFE Strategy for Trachoma:** **S**urgery (for trichiasis), **A**ntibiotics (Azithromycin), **F**acial cleanliness, **E**nvironmental improvement. * **Treatment of choice:** For a few lashes, **Electrolysis** or **Cryotherapy**; for multiple lashes, surgical correction (e.g., Jaesche-Arlt operation).

Question 156: Which of the following conditions is associated with angioid streaks?

A. Sturge-Weber's syndrome
B. Sickle cell disease (Correct Answer)
C. Pseudoexfoliation syndrome
D. Septo-optic dysplasia

Explanation: **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.

Question 157: Which of the following are produced by Vitamin A deficiency?

A. Bitot's Spots
B. Trantas spots
C. Keratomalacia
D. Xerophthalmia (Correct Answer)

Explanation: **Explanation:** The term **Xerophthalmia** (Option D) is the correct answer because it is the comprehensive clinical spectrum encompassing all ocular manifestations of Vitamin A deficiency. It includes everything from night blindness to total corneal liquefaction. **Why the other options are technically incorrect in this context:** * **Bitot’s Spots (Option A):** These are a *specific sign* of Vitamin A deficiency (X1B), characterized by triangular, foamy patches on the bulbar conjunctiva. While caused by the deficiency, they are a subset of Xerophthalmia, not the term for the entire condition. * **Keratomalacia (Option C):** This represents the *end-stage* of the deficiency (X3), involving total corneal necrosis. Like Bitot's spots, it is a component of Xerophthalmia, not the umbrella term. * **Trantas Spots (Option B):** These are **not** related to Vitamin A deficiency. They are white, limbal eosinophilic deposits seen in **Vernal Keratoconjunctivitis (VKC)**, a type of allergic conjunctivitis. **High-Yield Clinical Pearls for NEET-PG:** * **WHO Classification of Xerophthalmia:** * **X1A:** Conjunctival Xerosis * **X1B:** Bitot’s Spots * **X2:** Corneal Xerosis * **X3A/X3B:** Keratomalacia (<1/3 or >1/3 of cornea) * **XN:** Night Blindness (Nyctalopia) — **Earliest clinical symptom.** * **XF:** Xerophthalmic Fundus (white spots on the retina). * **Treatment (WHO Schedule):** 200,000 IU orally on Day 0, Day 1, and Day 14 (half dose for infants 6–12 months; 50,000 IU for <6 months). * **Pathophysiology:** Vitamin A is essential for the health of goblet cells; its deficiency leads to **squamous metaplasia** of the conjunctival epithelium.

Question 158: Marfan's syndrome is associated with which of the following ophthalmological findings?

A. Retinal detachment
B. Vitreous hemorrhage
C. Ectopia lentis (Correct Answer)
D. Roth spots

Explanation: **Explanation:** **Marfan’s Syndrome** is an autosomal dominant connective tissue disorder caused by a mutation in the **FBN1 gene** on chromosome 15, leading to defective **fibrillin-1**. This protein is a major component of the ciliary zonules that hold the lens in place. **1. Why Ectopia Lentis is Correct:** The hallmark ocular feature of Marfan’s is **Ectopia lentis** (dislocation of the lens), occurring in approximately 50–80% of patients. Due to zonular weakness, the lens typically undergoes **superotemporal (upward and outward)** subluxation. Importantly, the zonules usually remain intact but are stretched, and accommodation is often preserved. **2. Why Other Options are Incorrect:** * **Retinal Detachment (A):** While Marfan’s patients are at a higher risk for rhegmatogenous retinal detachment due to increased axial length (high myopia) and lattice degeneration, it is a secondary complication rather than the primary diagnostic ocular finding. * **Vitreous Hemorrhage (B):** This is typically associated with proliferative retinopathies (like Diabetes) or trauma, not directly with the primary pathology of Marfan’s. * **Roth Spots (D):** These are retinal hemorrhages with white centers, classically seen in **Subacute Bacterial Endocarditis (SBE)**, leukemia, or severe anemia. **High-Yield Clinical Pearls for NEET-PG:** * **Direction of Displacement:** Marfan’s = **Upward** (Superior); Homocystinuria = **Downward** (Inferior). * **Homocystinuria:** Unlike Marfan’s, zonules are brittle/disintegrated, and accommodation is lost. * **Other Marfan’s Ocular Signs:** Microspherophakia (small spherical lens), flat cornea (cornea plana), and increased axial length leading to myopia. * **Systemic Association:** Always look for arachnodactyly, tall stature, and aortic root dilation/dissection in the clinical stem.

Question 159: A patient presented with ocular complaints and was found to have 'Dalen-Fuchs nodules'. These nodules are characteristic of which of the following conditions?

A. Eales disease
B. Allergic conjunctivitis
C. Sympathetic ophthalmia (Correct Answer)
D. Retinal detachment

Explanation: **Explanation:** **Sympathetic Ophthalmia (SO)** is a rare, bilateral granulomatous panuveitis that occurs following a penetrating ocular injury or intraocular surgery to one eye (the "exciting eye"). The fellow, uninjured eye (the "sympathizing eye") subsequently develops inflammation due to a cell-mediated autoimmune response against uveal antigens. **Dalen-Fuchs nodules** are the hallmark histopathological and clinical feature of SO. They are small, yellowish-white, elevated lesions located between the **Bruch’s membrane and the Retinal Pigment Epithelium (RPE)**. They consist of aggregates of epithelioid cells, lymphocytes, and pigment-laden macrophages. **Analysis of Incorrect Options:** * **A. Eales disease:** An idiopathic peripheral inflammatory venulitis characterized by peripheral retinal ischemia, neovascularization, and recurrent vitreous hemorrhage. It does not feature Dalen-Fuchs nodules. * **B. Allergic conjunctivitis:** A Type I hypersensitivity reaction involving the conjunctiva. Clinical signs include chemosis, itching, and papillae (e.g., Cobblestone papillae in VKC), but no intraocular granulomatous nodules. * **D. Retinal detachment:** A structural separation of the neurosensory retina from the RPE. While it can occur secondary to severe uveitis (exudative RD), it is not the primary association for Dalen-Fuchs nodules. **High-Yield Clinical Pearls for NEET-PG:** * **Vogt-Koyanagi-Harada (VKH) Syndrome:** Dalen-Fuchs nodules are also seen here, as it shares a similar granulomatous pathology with SO. * **Prevention:** Evisceration/Enucleation of a severely injured eye within **2 weeks** (the "safe period") can prevent the development of SO in the sympathizing eye. * **Histology:** SO is characterized by a "non-necrotizing granulomatous inflammation" with **sparing of the choriocapillaris**.

Question 160: Mutton-fat keratic precipitates are not seen in which of the following conditions?

A. Tuberculosis
B. Fuchs' heterochromic cyclitis (Correct Answer)
C. Sarcoidosis
D. None of the above

Explanation: **Explanation:** The presence of **Mutton-fat Keratic Precipitates (KPs)** is a hallmark of **Granulomatous Uveitis**. These are large, greasy-looking, yellowish-white clusters of inflammatory cells (primarily epithelioid cells and macrophages) deposited on the corneal endothelium. **1. Why Fuchs’ Heterochromic Cyclitis (FHC) is the correct answer:** FHC is a chronic, **non-granulomatous** uveitis. The KPs in FHC are characteristically **small, round or stellate, and fine/white**. They are distributed diffusely over the entire corneal endothelium, unlike the inferior (Arlt’s triangle) distribution seen in granulomatous conditions. Therefore, mutton-fat KPs are not a feature of FHC. **2. Why other options are incorrect:** * **Tuberculosis (Option A):** A classic cause of granulomatous uveitis. It typically presents with large mutton-fat KPs and iris nodules (Koeppe/Busacca). * **Sarcoidosis (Option C):** Another prototypical multisystem granulomatous disease. It frequently presents with bilateral mutton-fat KPs and "candle-wax drippings" (perivasculitis) in the retina. **Clinical Pearls for NEET-PG:** * **Arlt’s Triangle:** The typical triangular distribution of KPs on the lower part of the cornea due to convection currents in the aqueous humor. * **FHC Triad:** Heterochromia iridis (iris color change), diffuse fine KPs, and early cataract formation. Notably, FHC does **not** typically lead to posterior synechiae. * **Other causes of Mutton-fat KPs:** Syphilis, Leprosy, Vogt-Koyanagi-Harada (VKH) syndrome, and Sympathetic Ophthalmitis.

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