Ocular Manifestations of Systemic Disorders — MCQs

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

Question 231: In acute anterior uveitis, what is the typical appearance of the pupil?

A. Oval
B. Circular
C. Small and irregular (Correct Answer)
D. Any of the above

Explanation: In **Acute Anterior Uveitis (Iridocyclitis)**, the pupil undergoes characteristic changes due to inflammation of the iris and ciliary body. The correct answer is **Small and irregular** because of two primary mechanisms: 1. **Small (Miosis):** Inflammation causes irritation and spasm of the **sphincter pupillae** muscle. Additionally, the engorgement of iris blood vessels (radial arrangement) leads to a "bulkier" iris, further narrowing the pupillary aperture. 2. **Irregular:** The inflammatory process produces a protein-rich exudate (fibrin). This sticky exudate causes the posterior surface of the iris to adhere to the anterior capsule of the lens, a condition known as **Posterior Synechiae**. These adhesions occur at discrete points, preventing the pupil from dilating uniformly and resulting in a "festooned" or irregular appearance. **Analysis of Incorrect Options:** * **Oval:** An oval, vertically dilated pupil is a classic hallmark of **Acute Congestive Glaucoma**, not uveitis. * **Circular:** A normal pupil is circular. In uveitis, the presence of synechiae and muscular spasm inevitably distorts this shape. * **Any of the above:** The clinical presentation of uveitis is specific; while the degree of irregularity varies, the "small and irregular" triad is the diagnostic standard. **High-Yield Clinical Pearls for NEET-PG:** * **Festooned Pupil:** This term describes the irregular shape seen when a pupil with posterior synechiae is dilated with a mydriatic. * **Mydriatic of Choice:** Atropine (1%) is used to provide rest to the ciliary muscle and break synechiae. * **Differential Diagnosis:** Always differentiate from Acute Glaucoma (Dilated/Oval pupil) and Acute Conjunctivitis (Normal pupil). * **Aqueous Flare/Cells:** These are the "gold standard" slit-lamp findings for grading activity in anterior uveitis.

Question 232: Giant cell arteritis is known to cause which of the following ocular complications?

A. Episcleritis
B. Anterior ischemic optic neuropathy (Correct Answer)
C. Neuroparalytic keratitis
D. Band keratitis

Explanation: **Explanation:** **Giant Cell Arteritis (GCA)**, also known as Temporal Arteritis, is a systemic granulomatous vasculitis affecting medium and large-sized arteries. The most dreaded ocular complication of GCA is **Arteritic Anterior Ischemic Optic Neuropathy (A-AION)**. **Why Option B is Correct:** A-AION occurs due to the occlusion of the **short posterior ciliary arteries**, which supply the optic nerve head. This leads to sudden, painless, profound loss of vision, often accompanied by a "chalky white" edema of the optic disc. This is a medical emergency because, without immediate systemic corticosteroid treatment, the contralateral eye can be affected within days. **Why Other Options are Incorrect:** * **A. Episcleritis:** This is more commonly associated with collagen vascular diseases like Rheumatoid Arthritis or Systemic Lupus Erythematosus, rather than GCA. * **C. Neuroparalytic Keratitis:** This results from damage to the Trigeminal nerve (CN V), leading to loss of corneal sensation. GCA does not typically involve the sensory nerves of the cornea. * **D. Band Keratitis:** This is characterized by calcium deposits in the Bowman’s layer, often seen in chronic uveitis (especially in JIA), hypercalcemia, or chronic renal failure. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Symptoms:** Jaw claudication (most specific), scalp tenderness, headache, and polymyalgia rheumatica. * **Diagnostic Markers:** Markedly elevated **ESR** (often >100 mm/hr) and **C-reactive protein (CRP)**. * **Gold Standard Diagnosis:** Temporal artery biopsy. * **Management:** Do not wait for biopsy results; start high-dose IV Methylprednisolone immediately to prevent bilateral blindness.

Question 233: A stye is another name for which of the following conditions?

A. Chalazion
B. Hordeolum internum
C. Hordeolum externum (Correct Answer)
D. None of the above

Explanation: **Explanation:** A **Stye** is the common clinical term for a **Hordeolum externum**. It is an acute, focal, pyogenic (usually Staphylococcal) infection of the eyelash follicle and its associated glands—the **Glands of Zeis** (sebaceous) or **Glands of Moll** (sweat). Clinically, it presents as a painful, red, and tender swelling at the eyelid margin, often pointing outwards. **Analysis of Options:** * **Hordeolum externum (Correct):** As defined above, this is the medical term for a stye. It involves the superficial structures of the lid margin. * **Hordeolum internum (Incorrect):** This is an acute infection of the **Meibomian glands**. Unlike a stye, the inflammation is located deeper within the tarsal plate, and the swelling usually points toward the conjunctival side (palpebral conjunctiva) rather than the skin. * **Chalazion (Incorrect):** This is a **chronic, non-infectious granulomatous inflammation** of the Meibomian glands caused by the obstruction of ducts. Unlike a stye, a chalazion is typically **painless** and presents as a firm, "bead-like" nodule away from the lid margin. **High-Yield Clinical Pearls for NEET-PG:** * **Primary Pathogen:** *Staphylococcus aureus* is the most common causative organism for both internal and external hordeola. * **Treatment:** Most styes are self-limiting; warm compresses are the mainstay of treatment to facilitate drainage. * **Recurrent Chalazia:** In elderly patients, recurrent chalazia at the same site should be biopsied to rule out **Sebaceous Gland Carcinoma**. * **Surgical Management:** If a chalazion requires incision and curettage (I&C), a **vertical incision** is made on the conjunctival surface to avoid damaging the Meibomian ducts.

Question 234: What is the commonest tumor found at the inner canthus of the eye?

A. Rodent ulcer (Correct Answer)
B. Dermoid cyst
C. Malignant melanoma
D. Buruli ulcer

Explanation: **Explanation:** **Basal Cell Carcinoma (BCC)**, clinically known as a **Rodent Ulcer**, is the most common malignant eyelid tumor, accounting for approximately 90% of all cases. It has a strong predilection for the **lower eyelid (50-60%)**, followed immediately by the **inner (medial) canthus (25-30%)**. The inner canthus is a high-risk zone because tumors here tend to invade deeper structures, such as the lacrimal drainage system and the orbit, more rapidly than those on the lid margin. **Analysis of Options:** * **Rodent Ulcer (BCC):** Correct. It typically presents as a pearly, indurated nodule with telangiectasia or a central ulcer with "rolled-out" edges. It is locally invasive but rarely metastasizes. * **Dermoid Cyst:** These are common benign orbital tumors in children, usually located at the **outer (lateral) canthus** (specifically the frontozygomatic suture), not the inner canthus. * **Malignant Melanoma:** A rare eyelid malignancy. While serious, its incidence is significantly lower than BCC. * **Buruli Ulcer:** A necrotizing skin infection caused by *Mycobacterium ulcerans*. It is a systemic infectious disease primarily affecting the limbs and is not a common primary tumor of the eyelid. **NEET-PG High-Yield Pearls:** 1. **Frequency Order:** Lower Lid > Inner Canthus > Upper Lid > Outer Canthus. 2. **Histopathology:** Characterized by "peripheral palisading" of nuclei and clusters of basaloid cells. 3. **Management:** Surgical excision with frozen section or **Mohs Micrographic Surgery** (gold standard) to ensure clear margins, especially for inner canthal lesions. 4. **UV Radiation:** The most significant risk factor for development.

Question 235: In sympathetic ophthalmitis, Dalen-Fuch's nodules are formed on the:

A. Iris
B. Ciliary body
C. Choroid (Correct Answer)
D. All of the above

Explanation: **Explanation:** **Sympathetic Ophthalmitis (SO)** is a rare, bilateral granulomatous panuveitis that occurs following a penetrating injury or intraocular surgery in one eye (the "exciting eye"), subsequently affecting the fellow eye (the "sympathizing eye"). **Why Choroid is Correct:** The hallmark histopathological feature of SO is a diffuse infiltration of the **choroid** by lymphocytes and multinucleated giant cells. **Dalen-Fuchs nodules** are pathognomonic lesions formed by the proliferation of Retinal Pigment Epithelium (RPE) cells, macrophages, and epithelioid cells. These nodules are specifically located **between the RPE and Bruch’s membrane**, which is anatomically the innermost layer of the choroid. **Why Other Options are Incorrect:** * **Iris & Ciliary Body:** While SO is a panuveitis (meaning the iris and ciliary body are also inflamed), Dalen-Fuchs nodules are distinct focal aggregations found in the posterior segment. Inflammation in the iris and ciliary body typically presents as "mutton-fat" keratic precipitates and posterior synechiae, rather than these specific nodules. **NEET-PG High-Yield Pearls:** * **Latent Period:** Usually occurs 2 weeks to 3 months after injury (90% within 1 year). * **Sparing of Choriocapillaris:** Unlike other uveitic conditions, the choriocapillaris is typically spared in SO. * **Clinical Sign:** The earliest sign in the sympathizing eye is often a loss of accommodation or mild anterior chamber reaction. * **Management:** Prevention involves enucleation of the injured eye within 10–14 days if it has no visual potential. Treatment involves long-term systemic corticosteroids and immunosuppressants.

Question 236: Colored halos are seen in all conditions EXCEPT:

A. Mucopurulent conjunctivitis
B. Acute anterior uveitis
C. Tetracycline (Correct Answer)
D. Glaucoma

Explanation: **Explanation:** Colored halos (rainbow-like rings around lights) are caused by the **diffraction or scattering of light** as it passes through an edematous cornea or through debris on the ocular surface. **Why Tetracycline is the Correct Answer:** Tetracycline is an antibiotic that does not cause corneal edema or significant surface debris. While it can cause ocular side effects like pseudotumor cerebri (leading to papilledema) or conjunctival deposits, it is **not** associated with the clinical sign of colored halos. **Analysis of Incorrect Options:** * **Mucopurulent Conjunctivitis:** Halos are caused by the accumulation of **mucus and discharge** on the corneal surface. These halos are unique because they can be "washed away" by blinking or irrigation (Finchan’s test negative). * **Acute Congestive Glaucoma:** High intraocular pressure leads to **corneal edema** (specifically epithelial edema). The edematous layers act as a diffraction grating, splitting white light into its spectral components. * **Acute Anterior Uveitis:** While less common than in glaucoma, severe uveitis can cause corneal edema due to endothelial dysfunction or inflammatory debris (keratic precipitates) on the posterior cornea, leading to halos. **Clinical Pearls for NEET-PG:** 1. **Finchan’s Test:** Used to differentiate glaucomatous halos from conjunctivitic halos. In glaucoma, the halo remains intact when a stenopeic slit is passed across the pupil; in conjunctivitis, the halo is broken or disappears. 2. **Other causes of halos:** Early cataract (hydration of lens fibers), corneal dystrophy (Fuchs’), and wearing ill-fitting contact lenses. 3. **Order of colors:** In glaucomatous halos, the **blue/violet** ring is innermost and **red** is outermost.

Question 237: Xerophthalmia can be caused by?

A. Steven-Johnson syndrome
B. Vitamin A deficiency
C. Sulfa drugs
D. All of the above (Correct Answer)

Explanation: **Explanation:** Xerophthalmia is a clinical spectrum of ocular surface diseases characterized by extreme dryness of the conjunctiva and cornea. While most commonly associated with Vitamin A deficiency, the term broadly encompasses any condition leading to a pathological "dry eye" state due to structural or functional damage to the tear film components. **1. Vitamin A Deficiency:** This is the most common systemic cause. Vitamin A is essential for the health of the conjunctival epithelium. Deficiency leads to the loss of mucus-secreting goblet cells and squamous metaplasia, resulting in conjunctival and corneal xerosis (the hallmark of xerophthalmia). **2. Stevens-Johnson Syndrome (SJS):** This is a severe mucocutaneous hypersensitivity reaction. It causes extensive scarring of the conjunctiva (symblepharon), destruction of goblet cells, and blockage of the ductules of the lacrimal and accessory lacrimal glands. This leads to severe aqueous and mucin deficiency, causing profound xerophthalmia. **3. Sulfa Drugs:** These are the most common pharmacological triggers for Stevens-Johnson Syndrome and Toxic Epidermal Necrolysis (TEN). By inducing these systemic inflammatory conditions, sulfa drugs indirectly lead to the destruction of the ocular surface and subsequent xerophthalmia. **High-Yield Clinical Pearls for NEET-PG:** * **WHO Classification of Xerophthalmia:** Remember the sequence: **X1A** (Conjunctival xerosis), **X1B** (Bitot’s spots), **X2** (Corneal xerosis), **X3A/B** (Corneal ulceration/Keratomalacia), and **XS** (Corneal scar). * **Bitot’s Spots:** These are triangular, foamy, silvery-white patches on the bulbar conjunctiva (usually temporal) caused by *Corynebacterium xerosis* gas production on keratinized epithelium. * **Earliest Symptom:** Night blindness (Nyctalopia). * **Earliest Sign:** Conjunctival xerosis (though some texts cite impaired Dark Adaptation as the earliest functional sign).

Question 238: Iris bombe is due to which of the following?

A. Segmental posterior synechiae
B. Total posterior synechiae
C. Ring synechiae (Correct Answer)
D. Anterior synechiae

Explanation: ### Explanation **Iris bombe** is a clinical condition characterized by the forward bowing of the iris due to the entrapment of aqueous humor in the posterior chamber. #### Why "Ring Synechiae" is Correct The underlying mechanism is the formation of **360-degree (circumferential) posterior synechiae**, also known as **seclusio pupillae** or **ring synechiae**. When the iris becomes adherent to the anterior lens capsule for the entire 360 degrees of the pupillary margin, the aqueous humor produced by the ciliary body cannot flow from the posterior chamber into the anterior chamber. This leads to an increase in pressure within the posterior chamber, which physically pushes the peripheral iris forward (iris bombe), often resulting in secondary angle-closure glaucoma. #### Why Other Options are Incorrect * **Segmental posterior synechiae:** These are adhesions involving only parts of the pupillary margin. Because there are gaps between the adhesions, aqueous humor can still bypass the iris into the anterior chamber, preventing the pressure buildup required for iris bombe. * **Total posterior synechiae:** This refers to the adhesion of the entire posterior surface of the iris to the lens (occlusio pupillae). While it prevents aqueous flow, it typically results in a flattened anterior chamber rather than the characteristic "bombe" (bowing) appearance because the iris is plastered against the lens. * **Anterior synechiae (Peripheral Anterior Synechiae - PAS):** These are adhesions between the iris and the trabecular meshwork or cornea. While they cause glaucoma by blocking the drainage angle, they do not cause the forward bowing of the iris seen in iris bombe. #### High-Yield Clinical Pearls for NEET-PG * **Management:** The definitive treatment for iris bombe is **Laser Peripheral Iridotomy (LPI)**, which creates a bypass for the aqueous humor. * **Festooned Pupil:** Irregular pupillary dilatation seen in uveitis due to segmental posterior synechiae. * **Triad of Iris Bombe:** 1. Seclusio pupillae, 2. Increased posterior chamber pressure, 3. Shallowing of the peripheral anterior chamber.

Question 239: An elderly male with a systemic disease is found to have 'iris pearls' during ophthalmologic evaluation. What is this patient most likely suffering from?

A. Leprosy (Correct Answer)
B. Eales disease
C. Sympathetic ophthalmia
D. High myopia

Explanation: **Explanation:** **Iris pearls** are a pathognomonic clinical feature of **Leprosy (Hansen’s Disease)**, specifically the lepromatous type. These are small, white, sand-like pedunculated nodules found on the iris surface or at the pupillary margin. Pathologically, they represent miliary lepromas containing *Mycobacterium leprae*. They eventually enlarge, coalesce, and may drop into the anterior chamber. **Analysis of Options:** * **Leprosy (Correct):** In addition to iris pearls, ocular involvement includes madarosis (loss of eyebrows/lashes), lagophthalmos (due to 7th nerve palsy), and chronic granulomatous uveitis. * **Eales Disease:** This is an idiopathic peripheral perivasculitis (usually affecting young males). It is characterized by peripheral retinal neovascularization and recurrent vitreous hemorrhages, not iris nodules. * **Sympathetic Ophthalmia:** This is a bilateral granulomatous panuveitis following penetrating trauma to one eye. While it features **Dalen-Fuchs nodules** (located in the choroid/RPE), it does not present with iris pearls. * **High Myopia:** This is associated with degenerative changes such as **Fuchs’ spot** (pigmented macula), lacquer cracks, and posterior staphyloma, but has no correlation with iris nodules. **High-Yield Clinical Pearls for NEET-PG:** * **Iris Pearls:** Lepromatous Leprosy. * **Koeppe/Busacca Nodules:** Seen in granulomatous uveitis (e.g., Sarcoidosis, TB). * **Lisch Nodules:** Melanocytic hamartomas seen in Neurofibromatosis Type 1 (NF-1). * **Brushfield Spots:** White/gray spots on the iris periphery seen in Down Syndrome. * **Most common cause of blindness in Leprosy:** Lagophthalmos leading to exposure keratopathy and corneal ulceration.

Question 240: In maturity onset diabetes mellitus, when should ophthalmoscopy be performed?

A. Immediately (Correct Answer)
B. After 5 years
C. After 10 years
D. After 15 years

Explanation: **Explanation:** The timing of the first screening for Diabetic Retinopathy (DR) depends entirely on the type of Diabetes Mellitus (DM). **Why "Immediately" is correct:** In **Type 2 DM (Maturity-onset)**, the exact onset of hyperglycemia is often unknown and can precede the clinical diagnosis by several years. Consequently, approximately 20% of patients already have some degree of retinopathy at the time of diagnosis. Therefore, the American Academy of Ophthalmology (AAO) and national guidelines mandate a dilated fundus examination **immediately or shortly after diagnosis**. **Why the other options are incorrect:** * **After 5 years:** This is the screening protocol for **Type 1 DM**. Since the onset of Type 1 is usually acute and clearly identifiable, retinopathy rarely develops within the first 5 years of the disease. * **After 10/15 years:** These timeframes are far too late. Waiting this long would miss the window for early intervention (like laser photocoagulation or anti-VEGF therapy), leading to irreversible vision loss from proliferative changes or macular edema. **High-Yield Clinical Pearls for NEET-PG:** * **Type 1 DM Screening:** First exam 5 years after diagnosis, then annually. * **Type 2 DM Screening:** First exam at the time of diagnosis, then annually. * **Pregnancy and DM:** Diabetic women who become pregnant should have an exam in the **first trimester** and be monitored every 3 months (due to the risk of rapid progression), except in cases of gestational diabetes (where the risk of DR is negligible). * **Earliest Sign of DR:** Microaneurysms (found in the inner nuclear layer). * **First Clinically Detectable Sign:** Microaneurysms seen on ophthalmoscopy.

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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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