Ocular Manifestations of Systemic Disorders Practice Questions

Q: In mercury poisoning, what causes the brown reflex?

Anterior lens capsule. **Explanation:** The correct answer is **C. Anterior lens capsule.** Mercury poisoning, specifically chronic exposure to mercury vapor (mercurialism), leads to a distinct ocular sign known as **Mercuria-lentis**. This is characterized by a bilateral, symmetric, dull-grey to rose-brown discoloration of the **anterior lens capsule**. The discoloration is caused by the deposition of fine mercury particles on the capsule's surface. Importantly, this is a permanent finding that does not affect visual acuity and is often considered a diagnostic "biomarker" of chronic exposure. **Analysis of Options:** * **Anterior/Posterior Cornea (Options A & B):** While some metals like copper deposit in the cornea (Kayser-Fleischer ring in Descemet’s membrane), mercury specifically targets the lens capsule. Mercury does not typically cause a brown reflex in the corneal layers. * **Posterior Lens Capsule (Option D):** The deposition in mercuria-lentis is localized to the anterior surface. Posterior capsule changes are more commonly associated with systemic steroid use or radiation, not mercury. **High-Yield Clinical Pearls for NEET-PG:** * **Mercuria-lentis:** Look for the keyword "Rose-brown reflex" or "Lustreless" appearance of the anterior lens. * **Chrysiasis:** Gold deposition in the **stroma** of the cornea (associated with rheumatoid arthritis treatment). * **Argyrosis:** Silver deposition, typically causing a slate-grey discoloration of the **conjunctiva** and deep corneal layers. * **Chalcosis:** Copper deposition causing a **Sunflower cataract** (anterior capsule) and **Kayser-Fleischer ring** (Descemet’s membrane). * **Siderosis Bulbi:** Iron deposition leading to a "Rusty" appearance of the lens and iris.

Q: Amsler sign is seen in which of the following conditions?

Fuchs uveitis. **Explanation:** **Amsler Sign** (also known as the Amsler-Verrey sign) is a classic clinical finding in **Fuchs Heterochromic Iridocyclitis (FHI)**. It refers to the occurrence of a filiform hemorrhage in the anterior chamber (hyphema) following a paracentesis or minor trauma to the globe (such as during cataract surgery or even applanation tonometry). The underlying mechanism involves the presence of fragile, thin-walled neovascular vessels on the iris and in the angle of the anterior chamber. These abnormal vessels lack a proper basement membrane and bleed easily when the intraocular pressure (IOP) drops suddenly. **Analysis of Options:** * **Pars planitis:** Characterized by "snowbanking" and "snowballs" in the vitreous, but does not feature Amsler sign. * **Macular degeneration:** Associated with the **Amsler Grid** test (used to detect metamorphopsia), which is a common point of confusion for students. It does not involve the Amsler sign. * **Posner-Schlossman syndrome (Glaucomatocyclitic crisis):** Presents with recurrent episodes of very high IOP and mild anterior uveitis, but lacks the specific vascular fragility seen in FHI. **High-Yield Clinical Pearls for FHI:** 1. **Triad:** Heterochromia iridis (affected eye is usually lighter), diffuse stellate keratic precipitates (KPs), and early cataract formation. 2. **Chronic & Low Grade:** It is a non-granulomatous, chronic uveitis that typically does not respond to topical steroids. 3. **No Synechiae:** Despite chronic inflammation, posterior synechiae are characteristically absent. 4. **Complications:** Secondary glaucoma and posterior subcapsular cataract are common.

Q: All of the following HLA-phenotypes are associated with uveitis except?

HLA-10. **Explanation:** The association between Human Leukocyte Antigens (HLA) and uveitis is a high-yield topic in ophthalmology. The correct answer is **HLA-10**, as it has no established clinical association with uveitis or any specific ocular inflammatory syndrome. **Why the other options are associated with uveitis:** * **HLA-B27 (Option A):** This is the most common HLA association. It is strongly linked with **Acute Anterior Uveitis (AAU)**, often occurring in patients with seronegative spondyloarthropathies like Ankylosing Spondylitis, Reiter’s syndrome, and Psoriatic arthritis. * **HLA-B5 (Option B):** Specifically the **HLA-B51** subtype is a hallmark marker for **Behçet’s Disease**. Ocular involvement typically manifests as a devastating "cold" hypopyon uveitis and retinal vasculitis. * **HLA-BW54 (Option C):** This phenotype is specifically associated with **Posner-Schlossman Syndrome** (Glaucomatocyclitic crisis), characterized by recurrent episodes of mild anterior uveitis with significantly elevated intraocular pressure. **High-Yield Clinical Pearls for NEET-PG:** 1. **HLA-A29:** Strongly associated with **Birdshot Retinochoroidopathy** (highest relative risk among all HLA associations). 2. **HLA-DR4:** Associated with **Vogt-Koyanagi-Harada (VKH) syndrome** and Sympathetic Ophthalmitis. 3. **HLA-B7 & HLA-DR2:** Associated with **Presumed Ocular Histoplasmosis Syndrome (POHS)**. 4. **HLA-B27 Uveitis** is typically unilateral (or alternating), sudden in onset, and presents with a heavy cellular reaction (fibrinous exudates).

Q: Which of the following conditions is most commonly associated with acute anterior uveitis?

Ankylosing spondylitis. **Explanation:** **Ankylosing Spondylitis (AS)** is the most common systemic association of **Acute Anterior Uveitis (AAU)**. Approximately 25–30% of patients with AS will develop AAU during their lifetime. Conversely, in patients presenting with non-granulomatous AAU, nearly 50% are HLA-B27 positive, and of those, a significant portion has underlying AS. The uveitis in AS is typically unilateral (though it can alternate), sudden in onset, and recurrent. **Analysis of Options:** * **Reiter Syndrome (Reactive Arthritis):** While strongly associated with HLA-B27 and AAU, it is less common than AS. It is characterized by the classic triad of urethritis, conjunctivitis (more common than uveitis), and arthritis. * **Psoriatic Arthritis:** This is associated with uveitis in about 7% of cases. The inflammation is more likely to be chronic, bilateral, and may involve the posterior segment (panuveitis) more frequently than AS. * **Juvenile Rheumatoid Arthritis (JRA/JIA):** Specifically the **oligoarticular type** is a major cause of uveitis in children. However, JIA typically causes **Chronic Non-granulomatous Anterior Uveitis**, which is often asymptomatic ("white eye") and insidious, unlike the acute presentation seen in AS. **NEET-PG High-Yield Pearls:** * **HLA-B27 Association:** AS has the strongest association with HLA-B27 (>90% of patients). * **Clinical Presentation:** AAU presents with "Ciliary congestion," miosis, and aqueous cells/flare. * **Treatment:** Topical corticosteroids and cycloplegics (to prevent posterior synechiae) are the mainstays of treatment. * **Gender Predominance:** AS is significantly more common in young males (3:1 ratio).

Q: A child presents with albinism. What specialist evaluation is indicated?

Ophthalmology consultation. **Explanation:** Albinism is a group of genetic disorders characterized by a deficit in melanin production. In **Oculocutaneous Albinism (OCA)**, both the skin and eyes are affected, while in **Ocular Albinism (OA)**, the manifestations are primarily confined to the eyes. Melanin is crucial for the normal development of the optic pathway; its absence leads to significant ocular morbidity. **Why Ophthalmology is the correct answer:** Melanin deficiency during embryogenesis results in: 1. **Foveal Hypoplasia:** Failure of the fovea to develop, leading to poor central visual acuity. 2. **Optic Nerve Misrouting:** Excessive decussation (crossing) of nerve fibers at the optic chiasm, resulting in loss of stereopsis (depth perception). 3. **Iris Transillumination & Photophobia:** Lack of pigment in the iris allows light to pass through it. 4. **Nystagmus:** Often develops early in life due to poor fixation. A specialist evaluation is mandatory to manage refractive errors, provide low-vision aids, and monitor for squint or nystagmus. **Why other options are incorrect:** * **ENT/Neurosurgery:** Albinism does not typically involve the auditory system or intracranial structures requiring surgical intervention. * **Electrocardiography:** While some rare syndromes like **Hermansky-Pudlak** (bleeding diathesis/pulmonary fibrosis) or **Chédiak-Higashi** (immunodeficiency) are associated with albinism, they do not primarily present with cardiac conduction defects requiring routine ECG. **Clinical Pearls for NEET-PG:** * **Pendular Nystagmus** is a hallmark sign in children with albinism. * **Tyrosinase** is the key enzyme deficient in the most common form (OCA1). * **Photophobia management:** Tinted glasses or photochromic lenses are standard recommendations. * **Systemic Association:** Always rule out Hermansky-Pudlak syndrome if a patient with albinism presents with easy bruising or bleeding.

Q: What is the first sign of Vitamin A deficiency?

Conjunctival xerosis. **Explanation:** Vitamin A (Retinol) is essential for maintaining the integrity of epithelial surfaces and the health of the retina. The ocular manifestations of Vitamin A deficiency are collectively termed **Xerophthalmia**. **Why Conjunctival Xerosis is the correct answer:** According to the WHO classification of Xerophthalmia, **Conjunctival Xerosis (Stage X1A)** is considered the **first clinical sign**. It is characterized by the loss of goblet cells, leading to a dry, lusterless, and "muddy" appearance of the bulbar conjunctiva. While Night Blindness (XN) is the earliest *symptom*, Conjunctival Xerosis is the first *objective sign* visible on examination. **Analysis of Incorrect Options:** * **Bitot’s Spot (X1B):** These are triangular, foamy, silvery-white patches on the bulbar conjunctiva. While highly characteristic of Vitamin A deficiency, they occur *after* the initial xerosis. * **Corneal Ulcer (X3A):** This represents advanced disease where the cornea becomes involved. It is a late stage and carries a risk of permanent scarring. * **Keratomalacia (X3B):** This is the most severe stage, characterized by liquefactive necrosis of the cornea. It is a medical emergency and occurs long after the initial signs. **High-Yield Facts for NEET-PG:** * **WHO Classification Sequence:** XN (Night blindness) → X1A (Conjunctival xerosis) → X1B (Bitot’s spots) → X2 (Corneal xerosis) → X3A (Corneal ulcer 1/3) → XS (Corneal scar) → XF (Xerophthalmic fundus). * **Earliest Symptom:** Night Blindness (Nyctalopia). * **Earliest Sign:** Conjunctival Xerosis. * **Treatment:** The "Schedule of 0, 1, and 14" (200,000 IU orally on day 0, day 1, and day 14 for children >1 year).

Q: In a patient with iridocyclitis, which of the following types of synechiae result in iris bombe formation?

Ring synechiae. **Explanation:** The correct answer is **Ring synechiae (Option C)**. **Mechanism of Iris Bombe:** Iris bombe occurs due to the complete 360-degree adhesion of the pupillary margin to the anterior lens capsule. This condition is known as **Ring Synechiae** (or *seclusio pupillae*). * **The Pathophysiology:** In iridocyclitis, inflammatory exudates cause the iris to stick to the lens. When this occurs circumferentially (360°), it creates a water-tight seal that blocks the flow of aqueous humor from the posterior chamber to the anterior chamber. * **The Result:** Aqueous humor accumulates in the posterior chamber, increasing pressure behind the iris. This causes the peripheral iris to bulge forward (ballooning), a clinical sign known as **Iris Bombe**. This leads to secondary angle-closure glaucoma. **Analysis of Incorrect Options:** * **A. Segmental synechiae:** These are localized adhesions involving only a portion of the pupillary circumference. Because aqueous humor can still escape through the non-adhered areas of the pupil, no pressure buildup occurs, and iris bombe does not develop. * **B. Total synechiae:** This refers to the adhesion of the entire posterior surface of the iris to the lens capsule. While this is a severe complication, it prevents the iris from bulging forward because the iris is "plastered" down against the lens; hence, iris bombe cannot form. **High-Yield Clinical Pearls for NEET-PG:** * **Seclusio pupillae:** 360° ring synechiae (leads to iris bombe). * **Occlusio pupillae:** An inflammatory membrane covering the entire pupillary area. * **Festooned pupil:** An irregular pupil shape seen after using mydriatics in a patient with segmental synechiae. * **Management:** The immediate treatment for iris bombe is **Laser Peripheral Iridotomy (LPI)** to create a bypass for aqueous humor.

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

Normal pupil. 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 1

In mercury poisoning, what causes the brown reflex?

Accepted Answer

Anterior lens capsule

Answer

Anterior cornea

Answer

Posterior cornea

Answer

Posterior lens capsule

Question 2

Ocular manifestations of Wegener's granulomatosis include all of the following except?

Accepted Answer

Internal ophthalmoplegia

Answer

Proptosis

Answer

Nasolacrimal duct obstruction

Answer

Necrotizing scleritis

Question 3

Which of the following statements regarding ocular manifestations of HIV is FALSE?

Accepted Answer

Cotton wool spots are indicative of Cytomegalovirus (CMV) infection in HIV patients.

Answer

Approximately 50% of HIV patients exhibit cotton wool spots.

Answer

Kaposi's sarcoma may manifest on the eyelids in HIV patients.

Answer

Vascular narrowing is observed in about 75% of HIV patients.

Question 4

Amsler sign is seen in which of the following conditions?

Accepted Answer

Fuchs uveitis

Answer

Pars planitis

Answer

Macular degeneration

Answer

Posner-Schlossman syndrome

Question 5

All of the following HLA-phenotypes are associated with uveitis except?

Accepted Answer

HLA-10

Answer

HLA-B27

Answer

HLA-B5

Answer

HLA-BW54

Question 6

Which of the following conditions is most commonly associated with acute anterior uveitis?

Accepted Answer

Ankylosing spondylitis

Answer

Reiter Syndrome

Answer

Psoriatic arthritis

Answer

Juvenile Rheumatoid arthritis

Question 7

A child presents with albinism. What specialist evaluation is indicated?

Accepted Answer

Ophthalmology consultation

Answer

Ear, Nose, and Throat consultation

Answer

Electrocardiography

Answer

Neurosurgery consultation

Question 8

What is the first sign of Vitamin A deficiency?

Accepted Answer

Conjunctival xerosis

Answer

Corneal ulcer

Answer

Keratomalacia

Answer

Bitot's spot

Question 9

In a patient with iridocyclitis, which of the following types of synechiae result in iris bombe formation?

Accepted Answer

Ring synechiae

Answer

Segmental synechiae

Answer

Total synechiae

Answer

None of the above

Question 10

Which of the following is not a feature of anterior uveitis?

Accepted Answer

Normal pupil

Answer

Cells in anterior chamber

Answer

Keratic precipitates

Answer

Corneal edema

Ocular Manifestations of Systemic Disorders — MCQs

Ocular Manifestations of Systemic Disorders — MCQs

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