Ocular Manifestations of Systemic Disorders — MCQs

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

Question 181: What is the most common ocular infection in patients with AIDS?

A. Chlamydia
B. Herpes simplex virus
C. Cytomegalovirus (CMV) (Correct Answer)
D. Rubella virus

Explanation: **Explanation:** **Cytomegalovirus (CMV)** is the correct answer because it is the most common opportunistic ocular infection and the leading cause of blindness in patients with late-stage AIDS. It typically occurs when the **CD4+ T-lymphocyte count falls below 50 cells/µL**. The hallmark clinical presentation is **CMV Retinitis**, characterized by a "pizza-pie" or "cheese and ketchup" appearance (confluent areas of yellow-white retinal necrosis with associated intraretinal hemorrhage). **Analysis of Incorrect Options:** * **A. Chlamydia:** While *Chlamydia trachomatis* is a common cause of inclusion conjunctivitis and trachoma worldwide, its prevalence is not specifically linked to the immunocompromised state of AIDS. * **B. Herpes Simplex Virus (HSV):** HSV can cause keratitis or Acute Retinal Necrosis (ARN) in HIV patients. However, it is significantly less common than CMV retinitis in the context of advanced AIDS. * **D. Rubella Virus:** Rubella is associated with congenital cataracts and "salt and pepper" retinopathy, but it is not a common opportunistic infection in adult AIDS patients. **High-Yield Clinical Pearls for NEET-PG:** * **Most common ocular finding in AIDS:** HIV Microangiopathy (Cotton wool spots). Note the distinction: CMV is the most common *infection*, but cotton wool spots are the most common *finding*. * **Treatment of choice for CMV Retinitis:** Intravenous or intravitreal **Ganciclovir**. Foscarnet and Cidofovir are alternatives. * **Immune Recovery Uveitis (IRU):** An inflammatory response that occurs in AIDS patients with CMV retinitis after starting HAART (Highly Active Antiretroviral Therapy) due to a recovering immune system. * **Second most common ocular infection:** Toxoplasmosis (presents as "headlight in the fog" appearance).

Question 182: A 32-year-old male presents with unilateral diminished vision in the right eye. On examination, there is mild iritis, vitritis, and a focal necrotic lesion is seen at the macula. What is the most likely diagnosis?

A. Multiple Evanescent White Dot syndrome
B. Ocular toxoplasmosis (Correct Answer)
C. Multifocal choroiditis
D. Ocular sarcoidosis

Explanation: **Explanation:** The clinical presentation of unilateral diminished vision, mild anterior chamber reaction (iritis), vitritis, and a focal necrotic retinal lesion is classic for **Ocular Toxoplasmosis**. **Why Ocular Toxoplasmosis is correct:** * **Pathophysiology:** Caused by the parasite *Toxoplasma gondii*, it is the most common cause of posterior uveitis worldwide. * **The "Headlight in the Fog" Appearance:** The focal necrotizing retinochoroiditis causes an intense overlying vitritis. This creates the characteristic clinical sign where the white lesion is seen through a hazy vitreous. * **Location:** While it can occur anywhere, it has a predilection for the macula, leading to significant vision loss. **Why other options are incorrect:** * **Multiple Evanescent White Dot Syndrome (MEWDS):** Typically presents with multiple, very small, fine white dots at the level of the RPE/deep retina. It does not cause focal necrotic lesions or significant vitritis. * **Multifocal Choroiditis (MFC):** Presents with multiple, small, punched-out chorioretinal scars and lesions. While it causes vitritis, it is usually bilateral and lacks the large, solitary focal necrotic appearance of Toxoplasmosis. * **Ocular Sarcoidosis:** Characterized by granulomatous uveitis (Mutton-fat KPs), "string of pearls" vitreous opacities, and retinal periphlebitis (candle-wax drippings), rather than a focal necrotic macular lesion. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Sign:** "Headlight in the fog" (focal retinitis + vitritis). * **Recurrence:** New lesions often arise at the margins of old, pigmented chorioretinal scars (satellite lesions). * **Treatment:** The "Triple Therapy" includes Pyrimethamine, Sulfadiazine, and Folinic acid (to prevent bone marrow toxicity), often combined with systemic steroids. * **Congenital Triad:** Chorioretinitis, Hydrocephalus, and Intracranial calcifications.

Question 183: Which of the following is not a feature of anterior uveitis?

A. Cells in anterior chamber
B. Normal pupil (Correct Answer)
C. Keratic precipitates
D. Corneal edema

Explanation: In anterior uveitis (iridocyclitis), the pupil is typically **constricted (miotic)** and often sluggish or non-reactive. This occurs due to reflex spasm of the sphincter pupillae muscle and the presence of inflammatory mediators. In chronic or severe cases, the pupil may become irregular due to **posterior synechiae** (adhesions between the iris and the lens). Therefore, a "normal pupil" is not a feature of the condition. **Explanation of Options:** * **Cells in the anterior chamber (Option A):** This is the hallmark of active inflammation. It represents the leakage of leukocytes from iris and ciliary body vessels into the aqueous humor. * **Keratic precipitates (Option C):** These are inflammatory cell clusters (leukocytes) that deposit on the corneal endothelium. They are a classic sign of anterior uveitis, categorized as "mutton-fat" (granulomatous) or "fine" (non-granulomatous). * **Corneal edema (Option D):** Inflammation can lead to endothelial dysfunction or a secondary rise in intraocular pressure (inflammatory glaucoma), causing the cornea to appear hazy or edematous. **High-Yield Clinical Pearls for NEET-PG:** * **Triad of Anterior Uveitis:** Ciliary congestion, miosis, and aqueous cells/flare. * **Aqueous Flare:** Caused by protein leakage (Tyndall effect); indicates a breakdown of the blood-aqueous barrier. * **Festooned Pupil:** An irregular pupil shape caused by localized posterior synechiae, often best visualized after instilling a mydriatic. * **Hypopyon:** A sterile collection of pus (WBCs) in the inferior angle of the anterior chamber, commonly seen in HLA-B27 associated uveitis or Behçet’s disease.

Question 184: Xerophthalmia is caused by which of the following?

A. Vitamin C deficiency
B. Small bowel resection
C. Cystic fibrosis (Correct Answer)
D. Chronic alcoholism

Explanation: **Explanation:** **Xerophthalmia** is a spectrum of ocular manifestations resulting from **Vitamin A deficiency**. While the most common cause globally is dietary insufficiency, in clinical practice, it can occur due to any condition that impairs the absorption, storage, or transport of fat-soluble vitamins (A, D, E, and K). **Why Cystic Fibrosis is correct:** Cystic Fibrosis (CF) causes thick secretions that obstruct pancreatic ducts, leading to **exocrine pancreatic insufficiency**. This results in the malabsorption of fats and fat-soluble vitamins. Consequently, patients with CF are at high risk for Vitamin A deficiency, which manifests ocularly as xerophthalmia (night blindness, Bitot’s spots, and corneal xerosis). **Analysis of Incorrect Options:** * **Vitamin C deficiency:** Causes **Scurvy**, characterized by collagen defects leading to subconjunctival hemorrhages and corkscrew hairs, but not xerophthalmia. * **Small bowel resection:** While extensive resection (Short Bowel Syndrome) can cause malabsorption, it is a less specific association for NEET-PG compared to the classic link between CF and fat-soluble vitamin deficiency. (Note: If "Ileal resection" were specified, Vitamin B12 deficiency would be the primary concern). * **Chronic alcoholism:** Primarily associated with **Vitamin B1 (Thiamine) deficiency**, leading to Wernicke-Korsakoff syndrome and ocular signs like nystagmus or ophthalmoplegia, rather than xerophthalmia. **High-Yield Clinical Pearls for NEET-PG:** * **WHO Classification of Xerophthalmia:** X1A (Conjunctival xerosis), X1B (Bitot’s spots), X2 (Corneal xerosis), X3A/B (Keratomalacia). * **Earliest Symptom:** Night blindness (Nyctalopia). * **Earliest Sign:** Conjunctival xerosis. * **Bitot’s Spots:** Triangular, foamy patches on the bulbar conjunctiva (usually temporal) consisting of keratinized epithelium and *Corynebacterium xerosis*. * **Treatment:** WHO schedule for Vitamin A (200,000 IU orally on days 0, 1, and 14).

Question 185: Uveoparotitis is seen in which of the following systemic conditions?

A. Sarcoidosis (Correct Answer)
B. Systemic Lupus Erythematosus
C. Scleroderma
D. Mumps

Explanation: **Explanation:** **Uveoparotitis**, also known as **Heerfordt’s Syndrome**, is a specific clinical manifestation of **Sarcoidosis**. It is characterized by a classic tetrad: 1. **Uveitis:** Typically bilateral, granulomatous anterior uveitis. 2. **Parotitis:** Chronic, painless enlargement of the parotid glands. 3. **Facial Nerve Palsy:** The most common neurological involvement (cranial nerve VII). 4. **Low-grade Fever.** Sarcoidosis is a multisystem disorder characterized by non-caseating granulomas. In the eye, it most commonly presents as "mutton-fat" keratic precipitates and "busacca/koeppe" nodules. **Analysis of Incorrect Options:** * **B. Systemic Lupus Erythematosus (SLE):** Primarily causes keratoconjunctivitis sicca (dry eye) or retinal vasculitis (cotton wool spots). It does not typically involve the parotid glands. * **C. Scleroderma:** Associated with eyelid tightening and dry eyes, but not the uveoparotid triad. * **D. Mumps:** While mumps causes acute, painful parotitis and can occasionally cause dacryoadenitis or optic neuritis, it does not cause the chronic granulomatous uveoparotitis seen in Heerfordt’s Syndrome. **High-Yield Clinical Pearls for NEET-PG:** * **Lofgren’s Syndrome:** Another variant of Sarcoidosis (Erythema nodosum + Bilateral hilar lymphadenopathy + Arthralgia). * **Candle-wax drippings:** Characteristic perivenous exudates (periphlebitis) seen in Sarcoid retinopathy. * **Investigation of Choice:** Chest X-ray/CT (Hilar lymphadenopathy) and elevated Serum ACE levels. * **Biopsy:** Gold standard (shows non-caseating granulomas).

Question 186: Aqueous flare seen in the anterior chamber is due to:

A. Leakage of protein particles into the aqueous humor following breakdown of the blood-aqueous barrier. (Correct Answer)
B. Leakage of leukocytes into the anterior chamber.
C. Both of the above.
D. None of the above.

Explanation: **Explanation:** **Aqueous flare** is a hallmark clinical sign of active intraocular inflammation (uveitis). It occurs due to the **breakdown of the blood-aqueous barrier**, specifically the tight junctions of the non-pigmented ciliary epithelium and the iris capillaries. When this barrier is compromised, high-molecular-weight **plasma proteins** (such as albumin and globulin) leak into the normally clear aqueous humor. These protein particles scatter light, a physical phenomenon known as the **Tyndall effect**, making the beam of a slit-lamp visible as a "hazy" or "smoky" appearance. **Analysis of Options:** * **Option A (Correct):** As explained, the Tyndall effect is caused specifically by protein leakage following barrier breakdown. * **Option B (Incorrect):** The presence of leukocytes (white blood cells) in the anterior chamber is termed **Aqueous Cells**. While cells and flare often coexist in uveitis, they represent different pathological processes. Cells indicate active inflammation, whereas flare indicates protein extravasation. * **Option C & D (Incorrect):** These are incorrect because flare is strictly defined by protein content, not cellular content. **High-Yield Clinical Pearls for NEET-PG:** * **Grading:** Aqueous flare is graded (0 to 4+) using a slit-lamp based on the visibility of iris details. * **Cells vs. Flare:** In chronic uveitis, "flare" may persist even after the inflammation has subsided (due to permanent vessel damage), whereas the presence of "cells" always indicates active disease requiring treatment. * **Plasmoid Aqueous:** If the protein concentration is extremely high, the aqueous may gelatinize, a condition known as plasmoid aqueous. * **Hypopyon:** A collection of inflammatory cells (pus) settling at the bottom of the anterior chamber.

Question 187: Diabetes mellitus is associated with which of the following ocular conditions?

A. Hard exudates
B. Neovascularization
C. Glaucoma
D. All of the above (Correct Answer)

Explanation: **Explanation:** Diabetes Mellitus (DM) is a multisystem metabolic disorder that affects the eye through various mechanisms, primarily involving microvascular damage and metabolic changes. * **Hard Exudates:** These are yellowish, waxy deposits of lipoproteins and lipid-laden macrophages in the outer plexiform layer of the retina. They occur due to chronic leakage from damaged capillaries (increased vascular permeability), a hallmark of Non-Proliferative Diabetic Retinopathy (NPDR). * **Neovascularization:** Chronic retinal ischemia triggers the release of Vascular Endothelial Growth Factor (VEGF). This leads to the formation of new, fragile vessels (Neovascularization) on the retina (NVD/NVE) or iris (NVI). This defines Proliferative Diabetic Retinopathy (PDR). * **Glaucoma:** Diabetes increases the risk of both Open-Angle Glaucoma and **Neovascular Glaucoma (NVG)**. NVG occurs when new vessels grow in the iridocorneal angle, obstructing aqueous outflow and causing a painful, blind eye. Since all three conditions are well-documented ocular complications of DM, **Option D** is the correct answer. **High-Yield Clinical Pearls for NEET-PG:** 1. **Earliest Clinical Sign of DR:** Microaneurysms (found in the inner nuclear layer). 2. **Earliest Pathological Change:** Loss of pericytes and basement membrane thickening. 3. **Dot-and-Blot Hemorrhages:** Located in the inner nuclear layer. 4. **Snowflake Cataract:** A classic, rare finding in young patients with uncontrolled Type 1 DM. 5. **Refractive Changes:** Hyperglycemia typically causes a **myopic shift** due to sorbitol accumulation in the lens, leading to hydration and increased curvature.

Question 188: All of the following are seen in Vogt-Koyanagi-Harada (VKH) syndrome except?

A. Vitiligo
B. Meningismus
C. Granulomatous uveitis
D. Iris heterochromia (Correct Answer)

Explanation: **Explanation:** **Vogt-Koyanagi-Harada (VKH) syndrome** is a multisystem autoimmune disorder characterized by T-cell mediated destruction of melanocytes. It typically affects pigmented tissues in the eye, ear, skin, and meninges. **Why Iris Heterochromia is the Correct Answer:** Iris heterochromia (difference in color between the two eyes) is **not** a feature of VKH. It is most classically associated with **Fuchs’ Heterochromic Iridocyclitis (FHI)** or Waardenburg syndrome. In VKH, while the iris may show signs of inflammation (nodules or synechiae), the primary pathology is a bilateral, diffuse granulomatous panuveitis rather than a change in iris pigment distribution leading to heterochromia. **Analysis of Other Options:** * **Granulomatous Uveitis (C):** This is the hallmark ocular finding. It presents as bilateral diffuse uveitis with "Mutton-fat" KPs and characteristic exudative (serous) retinal detachments. * **Meningismus (B):** This occurs during the **Prodromal stage**. Patients present with headache, neck stiffness, and CSF pleocytosis due to inflammation of the meninges. * **Vitiligo (A):** This occurs during the **Convalescent/Chronic stage**, along with poliosis (whitening of hair/eyelashes) and alopecia, due to the systemic destruction of skin melanocytes. **High-Yield Clinical Pearls for NEET-PG:** * **Four Stages of VKH:** Prodromal (Neurological) → Uveitic (Ocular) → Convalescent (Integumentary) → Chronic recurrent. * **Sugiura’s Sign:** Perilimbal vitiligo (depigmentation), a pathognomonic sign in the convalescent stage. * **Sunset Glow Fundus:** An orange-red discoloration of the fundus due to diffuse depigmentation of the RPE. * **Treatment:** High-dose systemic corticosteroids are the mainstay of therapy.

Question 189: What is the commonest eye tumor?

A. Melanoma
B. Retinoblastoma (Correct Answer)
C. Carcinoma of eyelid
D. Carcinoma of lacrimal sac

Explanation: **Explanation:** The correct answer is **Retinoblastoma (Option B)**. This is a high-yield fact for NEET-PG, as Retinoblastoma is the **most common primary intraocular malignancy in children** and the **most common primary intraocular tumor overall**. It arises from the neurosensory retina due to a mutation in the RB1 tumor suppressor gene on chromosome 13q14. While it is a pediatric tumor, its high incidence relative to other primary ocular malignancies makes it the correct answer in this context. **Analysis of Options:** * **A. Melanoma:** Uveal melanoma is the most common primary intraocular malignancy in **adults**, but it is less frequent globally than Retinoblastoma. Note: Metastatic tumors (secondary) are technically more common than primary tumors, but among the primary options listed, Retinoblastoma prevails. * **C. Carcinoma of eyelid:** While Basal Cell Carcinoma (BCC) is the most common malignant tumor of the **eyelid**, it is an adnexal tumor, not an "eye tumor" (intraocular) in the strict sense. * **D. Carcinoma of lacrimal sac:** These are extremely rare malignancies and are never the "most common" in any category. **High-Yield Clinical Pearls for NEET-PG:** * **Most common presenting sign:** Leukocoria (White pupillary reflex). * **Most common secondary tumor:** Metastasis (usually from breast in women, lung in men). * **Pathognomonic Histology:** Flexner-Wintersteiner rosettes. * **Calcification:** Present in 90% of cases (visible on CT/Ultrasound), a key diagnostic feature. * **Inheritance:** 40% are hereditary (bilateral/multifocal), 60% are sporadic (unilateral).

Question 190: Snow banking is a clinical sign seen in which condition?

A. Anterior uveitis
B. Posterior uveitis
C. Intermediate uveitis (Correct Answer)
D. None of these

Explanation: **Explanation:** **Intermediate uveitis** is the correct answer because "snow banking" is its hallmark clinical sign. Intermediate uveitis primarily involves the inflammation of the **pars plana** (the posterior part of the ciliary body) and the peripheral retina. * **Why it occurs:** Chronic inflammation leads to the accumulation of inflammatory exudates and fibrovascular membranes over the pars plana and the ora serrata. These white, plaque-like deposits typically settle in the inferior quadrant, resembling a "snow bank." * **Snowballs:** Another characteristic feature is "snowballs," which are whitish inflammatory aggregates (clumps of cells) floating in the vitreous. **Analysis of Incorrect Options:** * **Anterior Uveitis:** Characterized by cells and flare in the anterior chamber, Keratic Precipitates (KPs) on the corneal endothelium, and synechiae. It does not involve the pars plana. * **Posterior Uveitis:** Primarily involves the choroid and retina (chorioretinitis). While it can cause vitreous haze, the specific anatomical localization of exudates at the pars plana (snow banking) is absent. **High-Yield Clinical Pearls for NEET-PG:** * **Pars Planitis:** This term is used when intermediate uveitis is idiopathic (accounts for ~70% of cases). * **Systemic Associations:** Always rule out **Multiple Sclerosis (MS)** and **Sarcoidosis** in patients with intermediate uveitis. * **Most Common Complication:** Cystoid Macular Edema (CME) is the leading cause of vision loss in these patients. * **Triad of Intermediate Uveitis:** Vitritis, Snowballs, and Snow banking.

Practice by Chapter

Diabetes Mellitus

Practice Questions

Hypertension

Practice Questions

Autoimmune Disorders

Practice Questions

Thyroid Disease

Practice Questions

HIV and AIDS

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Hematological Disorders

Practice Questions

Neurological Disorders

Practice Questions

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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