Ocular Manifestations of Systemic Disorders — MCQs

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

Question 71: A recurrent chalazion should be subjected to histopathologic evaluation to exclude which of the following possibilities?

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

Explanation: **Explanation:** A **chalazion** is a chronic granulomatous inflammation of the Meibomian glands. While typically 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 "red flag" in ophthalmology. **1. Why Sebaceous Cell Carcinoma (SCC) is correct:** Sebaceous cell carcinoma is a highly malignant tumor arising from the Meibomian glands (most common), Zeis glands, or sebaceous glands of the caruncle. It is notorious for being a **"masquerade syndrome,"** frequently mimicking benign conditions like a chalazion or chronic blepharoconjunctivitis. Because it originates from the same glands involved in chalazion formation, any recurrence necessitates histopathologic evaluation to rule out malignancy. **2. Why other options are incorrect:** * **Basal Cell Carcinoma (BCC):** This is the most common eyelid malignancy. However, it typically presents as a pearly nodule with telangiectasia or a "rodent ulcer." It does not usually mimic the deep-seated inflammatory nodule of a chalazion. * **Squamous Cell Carcinoma:** The second most common eyelid tumor; it often arises from actinic keratosis and presents as an ulcerated plaque or scale. It does not involve the Meibomian glands. * **Malignant Melanoma:** A rare eyelid tumor arising from melanocytes. It presents as a pigmented lesion with irregular borders, not as a granulomatous tarsal lump. **Clinical Pearls for NEET-PG:** * **Masquerade Syndrome:** Always suspect Sebaceous Cell Carcinoma in cases of "recurrent chalazion" or "unilateral chronic blepharitis." * **Pagetoid Spread:** SCC is known for intraepithelial (Pagetoid) spread, which can lead to a misdiagnosis of conjunctivitis. * **Biopsy Technique:** If SCC is suspected, a **full-thickness lid biopsy** is required. Map biopsies may be needed to determine the extent of spread. * **Yellowish hue:** The presence of lipid within the tumor cells may give SCC a characteristic yellowish appearance.

Question 72: Sudden painless loss of vision is seen in which of the following conditions?

A. Vitreous hemorrhage (Correct Answer)
B. Optic atrophy
C. Developmental cataract
D. Acute angle closure glaucoma

Explanation: **Explanation:** The clinical presentation of **sudden painless loss of vision** is a high-yield topic in Ophthalmology. It typically indicates a vascular event, retinal detachment, or a sudden opacity in the visual axis. **Why Vitreous Hemorrhage is Correct:** Vitreous hemorrhage (VH) occurs when blood enters the vitreous cavity, often due to proliferative diabetic retinopathy, retinal tears, or trauma. Because the vitreous is avascular and lacks sensory innervation, the patient experiences a sudden onset of "floaters" or a "black curtain" falling over their vision without any associated pain. **Analysis of Incorrect Options:** * **Optic Atrophy:** This represents the end-stage of various optic nerve diseases. It typically presents as a **gradual**, progressive loss of vision rather than a sudden event. * **Developmental Cataract:** This is a congenital or early-childhood opacity of the lens. It presents as a **gradual** blurring of vision or leukocoria (white pupillary reflex), not a sudden loss. * **Acute Angle Closure Glaucoma:** While this causes a sudden loss of vision, it is characteristically **exceedingly painful**. It is associated with nausea, vomiting, a "steamy" cornea, and a mid-dilated non-reactive pupil. **NEET-PG High-Yield Pearls:** * **Sudden Painless Loss of Vision (The "Big Five"):** Central Retinal Artery Occlusion (CRAO), Central Retinal Vein Occlusion (CRVO), Vitreous Hemorrhage, Retinal Detachment, and Ischemic Optic Neuropathy. * **CRAO:** Look for "Cherry Red Spot" and "cattle-trucking" of vessels. * **CRVO:** Look for "Blood and Thunder" fundus (diffuse hemorrhages). * **Vitreous Hemorrhage:** If the fundus is not visible due to hemorrhage, the investigation of choice is **B-Scan Ultrasonography** to rule out underlying retinal detachment.

Question 73: In a recently diagnosed patient with Insulin-Dependent Diabetes Mellitus (IDDM), when should examination of the fundus be performed?

A. Immediately
B. At 1 year
C. At 5 years (Correct Answer)
D. None of the above

Explanation: **Explanation:** The timing of the initial ophthalmic examination in diabetic patients depends entirely on the type of Diabetes Mellitus (DM) and the likely duration of hyperglycemia prior to diagnosis. **Why Option C is Correct:** In **Type 1 DM (IDDM)**, the onset of the disease is usually acute and clearly defined. It is clinically established that Diabetic Retinopathy (DR) rarely develops within the first 5 years of the disease onset. Therefore, the American Academy of Ophthalmology (AAO) guidelines recommend the first screening **5 years after diagnosis**. This allows for the detection of early microvascular changes without unnecessary immediate screening in a population where the prevalence of retinopathy is near zero at the time of diagnosis. **Why Other Options are Incorrect:** * **Option A (Immediately):** This is the protocol for **Type 2 DM (NIDDM)**. Because Type 2 DM has an insidious onset, the patient may have been hyperglycemic for years before diagnosis. Approximately 20% of Type 2 diabetics already have some form of retinopathy at the time of discovery. * **Option B (At 1 year):** This is too early for Type 1 DM, as the metabolic insult to the retinal vasculature requires a longer duration to manifest as detectable clinical signs (like microaneurysms). **High-Yield Clinical Pearls for NEET-PG:** * **Type 1 DM Screening:** 5 years after diagnosis, then annually. * **Type 2 DM Screening:** At the time of diagnosis, then annually. * **Pregnancy and DM:** Diabetic women who become pregnant should have an examination 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). * **Most Important Risk Factor:** The **duration of diabetes** is the single most important predictor for the development and progression of retinopathy.

Question 74: Dalen-Fuchs' nodules are seen in which of the following conditions?

A. Retinitis pigmentosa
B. High myopia
C. Sympathetic ophthalmitis (Correct Answer)
D. Hypermetropia

Explanation: **Explanation:** **Sympathetic Ophthalmitis (SO)** is a rare, bilateral granulomatous panuveitis that occurs following a penetrating ocular injury or intraocular surgery in one eye (the "exciting eye"), subsequently affecting the other eye (the "sympathizing eye"). **Dalen-Fuchs' nodules** are the pathognomonic histopathological hallmark of this condition. They are small, discrete, yellowish-white elevations seen at the level of the retinal pigment epithelium (RPE). Microscopically, these nodules consist of collections of epithelioid cells, macrophages, and pigment-laden cells located between the RPE and Bruch’s membrane. **Analysis of Incorrect Options:** * **Retinitis Pigmentosa:** Characterized by "bone-spicule" pigmentation, arteriolar attenuation, and waxy disc pallor due to photoreceptor degeneration, not granulomatous nodules. * **High Myopia:** Associated with Forster-Fuchs' spots (subretinal neovascularization/hemorrhage at the macula), lacquer cracks, and posterior staphyloma. * **Hypermetropia:** A refractive error associated with a short axial length; it does not involve inflammatory nodule formation. **High-Yield Clinical Pearls for NEET-PG:** * **Latent Period:** SO usually develops 2 weeks to 3 months after injury (90% within 1 year). * **Histology:** Characterized by non-necrotizing granulomatous inflammation with "sparing of the choriocapillaris." * **Prevention:** Evisceration or enucleation of the injured eye within 10–14 days of injury if there is no visual potential. * **Differential Diagnosis:** Dalen-Fuchs' nodules are also seen in **Vogt-Koyanagi-Harada (VKH) syndrome** and **Sarcoidosis**.

Question 75: What condition is characterized by a true pulse in the retinal arteries?

A. Aortic aneurysm
B. Aortic regurgitation
C. Exophthalmic goiter
D. All of the above (Correct Answer)

Explanation: **Explanation:** The phenomenon of a **true retinal arterial pulse** is a rare clinical finding where the retinal arteries visibly expand and contract in synchrony with the cardiac cycle. Under normal physiological conditions, the intraocular pressure (IOP) is higher than the diastolic pressure in the retinal arteries, preventing a visible pulse. A true pulse occurs when there is a **high pulse pressure** (a large difference between systolic and diastolic blood pressure). **Why "All of the Above" is Correct:** 1. **Aortic Regurgitation (AR):** This is the most common cause. In AR, the backflow of blood into the left ventricle during diastole leads to a very low diastolic pressure and a high systolic stroke volume. This wide pulse pressure is transmitted to the retinal circulation (Quincke’s sign equivalent). 2. **Aortic Aneurysm:** Large aneurysms can cause significant hemodynamic alterations and wide pulse pressures, leading to visible pulsations in the peripheral and retinal vascular beds. 3. **Exophthalmic Goiter (Graves' Disease):** Hyperthyroidism creates a hyperdynamic circulatory state. The increased cardiac output and peripheral vasodilation result in an increased pulse pressure, which can manifest as retinal arterial pulsations. **Clinical Pearls for NEET-PG:** * **True vs. Spontaneous Venous Pulsation (SVP):** Do not confuse arterial pulses with SVP. SVP is seen in 80-90% of normal individuals; its *absence* is a sign of raised intracranial pressure (early papilledema). * **Retinal Arterial Pulsation vs. Glaucoma:** A pulse can also be induced by applying external pressure to the globe (digital pressure) or in cases of **acute angle-closure glaucoma**, where the IOP exceeds the diastolic pressure of the retinal artery. * **High-Yield Association:** Retinal arterial pulsation + Water hammer pulse = Aortic Regurgitation.

Question 76: All of the following are criteria for high risk of developing chloroquine retinopathy except?

A. Duration of use > 5 years
B. Daily dose of >250mg or >3mg/kg
C. Total dose >480g (Correct Answer)
D. Presence of renal failure

Explanation: **Explanation:** Chloroquine (CQ) and Hydroxychloroquine (HCQ) can cause irreversible maculopathy characterized by a "Bull’s eye" appearance. The risk criteria for toxicity have evolved, moving away from cumulative dose toward daily dose and duration. **Why Option C is the correct answer:** According to the **Revised AAO (American Academy of Ophthalmology) Guidelines**, the **cumulative dose** is no longer considered the primary predictor of toxicity. For Chloroquine, the threshold for high risk is a daily dose exceeding **2.3 mg/kg** of real body weight. The older criterion of a total dose >460–480g is now considered outdated in clinical practice compared to duration and weight-based dosing. **Analysis of other options:** * **A. Duration of use > 5 years:** This is a major risk factor. Toxicity is rare before 5 years of treatment; however, the risk increases significantly (up to 1% after 5-10 years and 20% after 20 years). * **B. Daily dose >3mg/kg:** For Chloroquine, a daily dose of **>2.3 mg/kg** (often rounded to >3mg/kg in older texts) or a flat dose of **>250mg/day** is a significant risk factor. (For HCQ, the limit is >5.0 mg/kg). * **D. Presence of renal failure:** Both drugs are cleared renally. Decreased GFR increases the serum half-life, significantly raising the risk of retinal accumulation and toxicity. **High-Yield NEET-PG Pearls:** * **Earliest Sign:** Fine granular pigmentary changes in the macula. * **Classic Sign:** Bull’s eye maculopathy (sparing of the foveal center). * **Screening:** Baseline exam followed by annual screening after 5 years. * **Gold Standard Tests:** 10-2 Visual Fields (VF) and Spectral Domain OCT (SD-OCT). Look for the **"Flying Saucer Sign"** on OCT. * **Note:** Toxicity can progress even after stopping the drug due to its long half-life.

Question 77: A patient presents with a normal anterior chamber and hazy cornea in one eye, and a shallow anterior chamber and miotic pupil in the fellow eye. Busacca nodules on the iris are observed. What is the diagnosis?

A. Endophthalmitis
B. Acute congestive glaucoma
C. Chronic simple glaucoma
D. Acute anterior uveitis (Correct Answer)

Explanation: **Explanation:** The clinical presentation points directly to **Acute Anterior Uveitis (Iridocyclitis)**. The "hazy cornea" in the affected eye is due to inflammatory keratic precipitates (KPs) or corneal edema. The "shallow anterior chamber and miotic pupil" in the fellow eye (or the same eye in chronic stages) are classic signs of **posterior synechiae**—inflammatory adhesions between the iris and the lens. These adhesions pull the iris backward or cause iris bombé, leading to a shallow chamber. **Busacca nodules** are a pathognomonic finding; they are inflammatory cell clusters located on the **iris stroma** (unlike Koeppe nodules, which are at the pupillary margin). Their presence confirms a granulomatous inflammatory process. **Why other options are incorrect:** * **Endophthalmitis:** This is a devastating intraocular infection usually following surgery or trauma. It presents with severe pain, loss of vision, chemosis, and a hypopyon, rather than localized iris nodules. * **Acute Congestive Glaucoma:** While this presents with a hazy cornea (edema) and shallow chamber, the pupil is typically **mid-dilated and vertically oval**, not miotic. There are no iris nodules. * **Chronic Simple Glaucoma:** This is a "silent" progressive disease with a normal-looking anterior segment and clear cornea. It does not present with inflammatory nodules or miosis. **NEET-PG High-Yield Pearls:** * **Koeppe Nodules:** Located at the pupillary border (seen in both granulomatous and non-granulomatous uveitis). * **Busacca Nodules:** Located on the iris surface (specific to **granulomatous** uveitis). * **Miosis in Uveitis:** Caused by ciliary muscle spasm and irritation of the sphincter pupillae. * **Treatment Gold Standard:** Topical steroids (to control inflammation) and cycloplegics like Atropine (to prevent synechiae and relieve ciliary spasm).

Question 78: What is the most common etiology of uveitis?

A. Infection
B. Idiopathic
C. Autoimmune (Correct Answer)
D. Traumatic

Explanation: **Explanation:** Uveitis refers to the inflammation of the uveal tract (iris, ciliary body, and choroid). In clinical practice and for the NEET-PG exam, it is essential to distinguish between the various etiologies. **Why Autoimmune is Correct:** The majority of uveitis cases are non-infectious and are associated with systemic immune-mediated disorders. The underlying mechanism involves a breakdown of the blood-ocular barrier and an exaggerated immune response against ocular antigens. Common associations include **HLA-B27 related spondyloarthropathies** (like Ankylosing Spondylitis), Sarcoidosis, Juvenile Idiopathic Arthritis (JIA), and Behçet’s disease. Even when a specific systemic disease isn't identified, the pathology is usually immune-driven. **Analysis of Incorrect Options:** * **Idiopathic:** While many cases are labeled idiopathic (up to 30-50% in some studies), modern diagnostic tools increasingly link these to underlying autoimmune processes. In the hierarchy of medical classification for exams, "Autoimmune/Systemic" is the primary category. * **Infection:** Infectious causes (e.g., Toxoplasmosis, Tuberculosis, Syphilis, HSV) are significant but represent a smaller percentage of total cases compared to autoimmune triggers. * **Traumatic:** Trauma causes "sympathetic ophthalmitis" or "traumatic iridocyclitis," but this is a specific subset and not the most common cause in the general population. **High-Yield Clinical Pearls for NEET-PG:** * **Most common systemic association:** HLA-B27 (presents as acute anterior uveitis). * **Most common cause of Posterior Uveitis:** Toxoplasmosis (Infectious). * **Most common cause of Uveitis in children:** Juvenile Idiopathic Arthritis (JIA) – characteristically a "white eye" (asymptomatic chronic anterior uveitis). * **Drug of choice:** Topical corticosteroids (e.g., Prednisolone acetate) are the mainstay for non-infectious uveitis.

Question 79: Lisch nodules are seen in:

A. Albright syndrome
B. Neurofibromatosis (Correct Answer)
C. Tuberous sclerosis
D. Piebaldism

Explanation: **Explanation:** **Lisch nodules** are the most common ocular manifestation of **Neurofibromatosis Type 1 (NF1)**, also known as von Recklinghausen disease. Pathologically, these are melanocytic hamartomas of the iris stroma. They appear as well-defined, dome-shaped, creamy-to-light brown elevations on the iris surface. While they do not affect vision, they are a crucial diagnostic criterion for NF1, appearing in over 95% of affected individuals by age 20. **Analysis of Options:** * **Neurofibromatosis (Correct):** Lisch nodules are a hallmark of NF1. Other ocular features include optic nerve gliomas and plexiform neurofibromas (S-shaped eyelid). * **Albright syndrome (McCune-Albright):** Characterized by polyostotic fibrous dysplasia, precocious puberty, and *café-au-lait* spots (with irregular "Coast of Maine" borders). It does not feature Lisch nodules. * **Tuberous sclerosis:** The classic ocular finding here is **Astrocytic Hamartoma** (Mulberry lesions) of the retina or optic disc, not iris nodules. * **Piebaldism:** A rare autosomal dominant disorder of melanocyte development characterized by congenital white forelock and stable depigmented skin patches. It lacks the hamartomatous growths seen in NF1. **High-Yield Clinical Pearls for NEET-PG:** * **Slit-lamp examination** is essential to differentiate Lisch nodules from common iris nevi (nevi are usually flat). * **NF1 Diagnostic Criteria (Mnemonic: CAFE SPOT):** **C**afé-au-lait spots (6+), **A**xillary/inguinal freckling (Crowe sign), **F**ibromas (Neurofibromas), **E**ye (Lisch nodules), **S**keletal (Sphenoid dysplasia), **P**ositive family history, **O**ptic **T**umor (Glioma). * **NF2** is primarily associated with **Presenile Posterior Subcapsular Cataracts**, not Lisch nodules.

Question 80: Which of the following signs is characterized by infrequent blinking of the eyelids in Graves' ophthalmopathy?

A. Enroth sign
B. Stellwag sign (Correct Answer)
C. Gifford's sign
D. Von Graefe sign

Explanation: **Explanation:** **Stellwag’s sign** is a classic clinical feature of Graves' ophthalmopathy (Thyroid Eye Disease) characterized by **infrequent or incomplete blinking**. This occurs due to increased sympathetic activity and the overaction of the Levator Palpebrae Superioris (LPS) muscle, leading to a "staring" appearance. **Analysis of Options:** * **Stellwag’s sign (Correct):** Refers specifically to a decreased frequency of blinking. * **Enroth sign:** Refers to **edema/puffiness of the eyelids**, particularly the upper lids, often due to orbital fat prolapse or fluid accumulation. * **Gifford’s sign:** Characterized by **difficulty in everting the upper eyelid** due to significant lid retraction and spasm. * **Von Graefe sign:** This is the most famous sign, referring to **"Lid Lag"**—where the upper eyelid fails to follow the movement of the globe during downward gaze. **High-Yield Clinical Pearls for NEET-PG:** * **Dalrymple sign:** Widening of the palpebral fissure due to upper lid retraction in the primary position (the "staring look"). * **Joffroy’s sign:** Absence of forehead wrinkling when the patient looks upward. * **Mobius sign:** Inability to maintain convergence of the eyes. * **Pathogenesis:** These signs result from sympathetic overactivity and later, fibrotic changes in the extraocular muscles (most commonly the **Inferior Rectus**, followed by the Medial Rectus). * **Diagnosis:** Clinical diagnosis is supported by Thyroid Function Tests (TFTs) and imaging (CT/MRI) showing "coke-bottle" appearance of muscles with **tendon sparing**.

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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