Ocular Manifestations of Systemic Disorders — MCQs

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

Question 161: A cherry-red spot on funduscopic examination is seen in all of the following conditions, except?

A. GM1 gangliosidosis
B. Niemann-Pick disease
C. Krabbe's disease (Correct Answer)
D. Multiple sulfatase deficiency

Explanation: ### Explanation The **cherry-red spot** is a classic clinical sign where the fovea appears bright red against a pale, opacified background. This occurs because the fovea lacks the ganglion cell layer; while the surrounding macula becomes opaque due to the accumulation of lipids or sphingolipids in the ganglion cells, the underlying vascular choroid remains visible through the thin foveola. **Why Krabbe’s Disease is the Correct Answer:** Krabbe’s disease (Globoid cell leukodystrophy) is caused by a deficiency of the enzyme **galactocerebrosidase**. Unlike other lysosomal storage disorders, it primarily affects the white matter of the brain and the myelin sheath. Ocular involvement in Krabbe’s typically manifests as **optic atrophy** and cortical blindness, rather than the accumulation of metabolites in retinal ganglion cells. Therefore, it does **not** present with a cherry-red spot. **Analysis of Incorrect Options:** * **GM1 Gangliosidosis:** A lysosomal storage disorder where gangliosides accumulate in the retina. Type I (infantile) frequently presents with a cherry-red spot (approx. 50% of cases). * **Niemann-Pick Disease:** Caused by sphingomyelinase deficiency. Type A is classically associated with a cherry-red spot in about 50% of patients. * **Multiple Sulfatase Deficiency:** A rare condition combining features of metachromatic leukodystrophy and mucopolysaccharidosis; it is a known, though less common, cause of a cherry-red spot. **High-Yield Clinical Pearls for NEET-PG:** * **Mnemonic for Cherry-Red Spot:** *"**C**herry **A**nyone **M**ay **S**it **I**n **T**he **S**and **N**ow"* * **C:** Central Retinal Artery Occlusion (CRAO) – *Most common cause in adults.* * **A:** Amaurotic Familial Idiocy (Tay-Sachs Disease) – *Most common cause in children.* * **M:** Metachromatic Leukodystrophy. * **S:** Sandhoff Disease. * **I:** Infantile Gaucher’s Disease. * **T:** Tay-Sachs Disease. * **S:** Sialidosis (Cherry-red spot myoclonus syndrome). * **N:** Niemann-Pick Disease. * **Note:** In CRAO, the spot is due to retinal ischemia/edema, whereas in storage disorders, it is due to metabolite deposition.

Question 162: What is a common feature between sympathetic ophthalmitis and Vogt-Koyanagi-Harada syndrome?

A. Autoimmune etiology
B. Injury
C. Uveitis
D. Vitiligo (Correct Answer)

Explanation: **Explanation:** Both **Sympathetic Ophthalmitis (SO)** and **Vogt-Koyanagi-Harada (VKH) syndrome** are bilateral, granulomatous panuveitis conditions driven by a T-cell mediated autoimmune response against **melanocytes** (specifically surface antigens like tyrosinase-related proteins). Because melanocytes are present in the uveal tract, skin, hair, and inner ear, both diseases share systemic features involving these tissues. **Vitiligo** (depigmentation of the skin) and **poliosis** (whitening of eyelashes/hair) are classic extraocular manifestations common to both. **Analysis of Options:** * **Option D (Correct):** Vitiligo occurs in both conditions due to the systemic destruction of melanocytes. In VKH, it is a hallmark of the convalescent stage; in SO, it occurs as a late systemic complication. * **Option A (Incorrect):** While both have an autoimmune etiology, "Vitiligo" is a more specific clinical *feature* shared between them. In many exam patterns, the most specific clinical sign is preferred over the broad underlying mechanism. * **Option B (Incorrect):** Injury (accidental or surgical) is the mandatory inciting factor for **Sympathetic Ophthalmitis** (the "exciting eye"). However, VKH is idiopathic and occurs without a history of trauma. * **Option C (Incorrect):** While both involve uveitis, it is the *defining* nature of the diseases rather than a "common feature" used to differentiate or link them in a comparative clinical context. **High-Yield Clinical Pearls for NEET-PG:** * **Dalen-Fuchs Nodules:** Small, yellow-white nodules (epithelioid cells) between the RPE and Bruch’s membrane; seen in both SO and VKH. * **SO Trigger:** Most common cause is penetrating ocular trauma; the second most common is intraocular surgery (e.g., evisceration is preferred over enucleation to prevent SO, though this is debated). * **VKH Stages:** Prodromal (flu-like/CNS), Acute uveitic (exudative RD), Convalescent (Sugiura sign/Sunset glow fundus), and Chronic recurrent. * **Treatment:** High-dose systemic corticosteroids are the mainstay for both.

Question 163: In mercury poisoning, what causes the brown reflex?

A. Anterior cornea
B. Posterior cornea
C. Anterior lens capsule (Correct Answer)
D. Posterior lens capsule

Explanation: **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.

Question 164: Ocular manifestations of Wegener's granulomatosis include all of the following except?

A. Proptosis
B. Nasolacrimal duct obstruction
C. Necrotizing scleritis
D. Internal ophthalmoplegia (Correct Answer)

Explanation: **Explanation:** Wegener’s Granulomatosis (now known as **Granulomatosis with Polyangiitis - GPA**) is a systemic necrotizing vasculitis involving small and medium-sized vessels. It classically presents with a triad of involvement: upper respiratory tract, lower respiratory tract (lungs), and kidneys. Ocular involvement occurs in approximately 50-60% of cases. **Why Internal Ophthalmoplegia is the Correct Answer:** Internal ophthalmoplegia refers to the paralysis of the pupil (dilated, non-reactive) and the ciliary muscle (loss of accommodation). GPA primarily causes **structural and inflammatory damage** rather than intrinsic neurological dysfunction of the intraocular muscles. While GPA can cause external ophthalmoplegia (due to orbital inflammation or nerve compression), internal ophthalmoplegia is not a characteristic feature. **Analysis of Incorrect Options:** * **Proptosis:** This is the most common orbital manifestation. It occurs due to the formation of an orbital inflammatory pseudotumor or direct extension of granulomatous disease from the paranasal sinuses. * **Nasolacrimal Duct Obstruction (NLDO):** GPA frequently involves the nasal mucosa and sinuses. Chronic inflammation and granuloma formation can lead to secondary obstruction of the nasolacrimal duct, causing epiphora. * **Necrotizing Scleritis:** This is a severe, vision-threatening complication of GPA. It often presents as "Sclerokeratitis" (peripheral ulcerative keratitis associated with scleritis) due to the underlying systemic vasculitis. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Marker:** c-ANCA (anti-proteinase 3 antibodies) is highly specific for GPA. * **Classic Triad:** Sinusitis, Pulmonary nodules/hemorrhage, and Glomerulonephritis. * **Ocular "Red Flag":** Peripheral Ulcerative Keratitis (PUK) in a patient with systemic symptoms should always raise suspicion of GPA. * **Treatment:** Systemic steroids and immunosuppressants (Cyclophosphamide or Rituximab).

Question 165: Which of the following statements regarding ocular manifestations of HIV is FALSE?

A. Approximately 50% of HIV patients exhibit cotton wool spots.
B. Kaposi's sarcoma may manifest on the eyelids in HIV patients.
C. Vascular narrowing is observed in about 75% of HIV patients.
D. Cotton wool spots are indicative of Cytomegalovirus (CMV) infection in HIV patients. (Correct Answer)

Explanation: ### Explanation **Why Option D is the correct (False) statement:** Cotton wool spots (CWS) are the most common clinical finding in **HIV Microangiopathy**, not CMV retinitis. While CWS represent focal areas of retinal ischemia (axoplasmic stasis in the nerve fiber layer), they are **non-infectious**. In contrast, **CMV Retinitis** is characterized by full-thickness retinal necrosis, hemorrhage, and edema (often described as a "pizza-pie" or "cheese and ketchup" appearance). CWS in an HIV patient do not require anti-viral treatment, whereas CMV retinitis is a vision-threatening emergency. **Analysis of other options:** * **Option A:** Approximately 50% of HIV patients develop CWS at some point during the disease course. They are the hallmark of HIV retinopathy. * **Option B:** Kaposi’s sarcoma is the most common ocular tumor in HIV/AIDS. It typically presents as a painless, reddish-purple vascular nodule on the eyelids or the conjunctiva (especially the inferior fornix). * **Option C:** Retinal vascular changes, including narrowing of arterioles and widening of veins, are observed in about 75% of HIV-infected individuals as part of the generalized microangiopathy. **High-Yield Clinical Pearls for NEET-PG:** * **Most common ocular finding in HIV:** Cotton wool spots (HIV Microangiopathy). * **Most common opportunistic ocular infection in HIV:** CMV Retinitis (occurs typically when CD4 count < 50 cells/µl). * **Immune Recovery Uveitis (IRU):** An intraocular inflammation occurring in patients with inactive CMV retinitis after starting HAART, due to a rising CD4 count. * **Drug Side Effect:** Rifabutin (used for MAC prophylaxis in HIV) can cause severe **hypopyon uveitis**.

Question 166: Puscher's retinopathy in acute pancreatitis is due to which of the following?

A. Occlusion of the posterior retinal artery with aggregated granulocytes (Correct Answer)
B. Occlusion of ciliary artery with exudation
C. Central retinal artery occlusion with cotton wool spots and hemorrhage
D. Inflammatory exudates in the retinal vein

Explanation: **Explanation:** **Purtscher’s Retinopathy** is a rare but distinct microvascular occlusive disorder typically associated with severe trauma, acute pancreatitis, or systemic lupus erythematosus (SLE). **Why Option A is Correct:** The underlying pathophysiology in acute pancreatitis involves the systemic activation of the **complement cascade** (specifically C5a). This leads to the formation of **leukocyte (granulocyte) aggregates**. These micro-emboli travel to the eye and cause occlusion of the **pre-capillary retinal arterioles** (specifically the posterior retinal artery branches). This results in the characteristic clinical findings: **Purtscher flecks** (areas of inner retinal whitening), cotton wool spots, and intraretinal hemorrhages, typically located around the optic nerve and macula. **Why Other Options are Incorrect:** * **Option B:** Ciliary artery occlusion would primarily affect the choroidal circulation or the optic nerve head (leading to infarction like AION), rather than the superficial retinal findings seen in Purtscher’s. * **Option C:** While cotton wool spots and hemorrhages are present, Purtscher’s is a **branch/pre-capillary arteriolar** occlusion, not a Central Retinal Artery Occlusion (CRAO). CRAO presents with a "cherry-red spot" and diffuse retinal whitening, which is absent here. * **Option D:** The pathology is primarily **arteriolar/embolic**, not venous. Inflammatory exudates in the retinal vein are characteristic of retinal vasculitis or Eales' disease. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad:** Trauma (crush injuries), Acute Pancreatitis, and Complement activation. * **Fundus Appearance:** "Purtscher flecks" (pathognomonic) are polygonal areas of retinal whitening between the retinal arterioles and veins. * **Management:** Usually observation; the condition is often self-limiting, though vision loss can be permanent if the macula is involved. * **Differential:** "Purtscher-like retinopathy" is the term used when the condition occurs in non-traumatic settings (like pancreatitis or renal failure).

Question 167: Which one of the following is the first symptom of sympathetic ophthalmia?

A. Pain
B. Colored haloes
C. Photophobia (Correct Answer)
D. Color blindness

Explanation: **Explanation:** **Sympathetic Ophthalmia (SO)** is a rare, bilateral granulomatous panuveitis that occurs following a penetrating ocular injury or intraocular surgery in one eye (the **exciting eye**), which subsequently leads to inflammation in the fellow, uninjured eye (the **sympathizing eye**). **Why Photophobia is the correct answer:** The earliest clinical manifestation of sympathetic ophthalmia is a **prodromal stage** characterized by a loss of accommodation and **photophobia**. This occurs due to early ciliary body irritation and mild anterior uveitis in the sympathizing eye. Patients often complain of difficulty with near work and sensitivity to light before significant visual loss or structural changes occur. **Analysis of Incorrect Options:** * **Pain:** While the eye may become irritable, acute severe pain is not the hallmark initial symptom; it is more characteristic of conditions like acute congestive glaucoma or endophthalmitis. * **Colored Haloes:** This is a classic symptom of corneal edema, most commonly seen in acute angle-closure glaucoma, not granulomatous uveitis. * **Color Blindness:** This typically indicates optic nerve pathology or retinal dystrophy. While the optic nerve can be involved in advanced SO (papillitis), it is never the presenting symptom. **High-Yield Clinical Pearls for NEET-PG:** * **Pathology:** Characterized by non-necrotizing granulomatous inflammation. A pathognomonic histological feature is **Dalen-Fuchs nodules** (clusters of epithelioid cells between the RPE and Bruch’s membrane). * **Sparing of Choriocapillaris:** Unlike many other uveitic conditions, the choriocapillaris is typically spared in SO. * **Prevention:** The most effective prevention is the **enucleation** of the injured (exciting) eye within **2 weeks** (10–14 days) of the injury if it has no visual potential. * **Treatment:** High-dose systemic corticosteroids and immunosuppressants.

Question 168: Amsler sign is seen in which of the following conditions?

A. Pars planitis
B. Fuchs uveitis (Correct Answer)
C. Macular degeneration
D. Posner-Schlossman syndrome

Explanation: **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.

Question 169: Which of the following is a painless condition?

A. Anterior diffuse uveitis
B. Anterior nodular uveitis
C. Posterior uveitis (Correct Answer)
D. Iridocyclitis

Explanation: **Explanation:** The key to answering this question lies in the anatomical distribution of sensory innervation in the eye. The **trigeminal nerve (Cranial Nerve V)**, specifically the ophthalmic division (V1), provides rich sensory innervation to the anterior segment of the eye, including the cornea, iris, and ciliary body. **Why Posterior Uveitis is the Correct Answer:** Posterior uveitis involves inflammation of the choroid (choroiditis), retina (retinitis), or vitreous. Unlike the anterior segment, the **choroid and retina lack sensory pain fibers**. Therefore, inflammation in these areas does not trigger pain. Patients typically present with painless blurring of vision, floaters, or scotomas. Pain only occurs in posterior uveitis if there is secondary involvement of the optic nerve or extension of inflammation to the anterior segment or sclera. **Why the Other Options are Incorrect:** * **Anterior Diffuse and Nodular Uveitis (Options A & B):** These are forms of inflammation involving the iris and ciliary body. Because these structures are highly vascular and densely innervated by the long and short ciliary nerves, inflammation leads to significant pain, photophobia, and ciliary spasm. * **Iridocyclitis (Option D):** This is the clinical term for anterior uveitis (inflammation of the iris and ciliary body). It is classically characterized by the "triad of symptoms": pain, redness (ciliary congestion), and photophobia. **NEET-PG High-Yield Pearls:** * **Painful Red Eye:** Think Anterior Uveitis, Acute Congestive Glaucoma, or Corneal Ulcer. * **Painless Loss of Vision:** Think Posterior Uveitis, Central Retinal Artery Occlusion (CRAO), Vitreous Hemorrhage, or Retinal Detachment. * **Mydriatics in Uveitis:** Atropine is used in anterior uveitis not just to prevent synechiae, but to provide **pain relief** by paralyzing the ciliary muscle (cycloplegia).

Question 170: All of the following are specific manifestations of albinism, except:

A. Red reflex (Correct Answer)
B. Decreased visual acuity
C. Photophobia
D. Nystagmus

Explanation: In albinism, the primary defect is a deficiency in melanin production. This lack of pigment in the uveal tract (iris and choroid) and the retinal pigment epithelium (RPE) leads to several characteristic ocular findings. **Explanation of the Correct Answer:** **A. Red reflex:** This is the correct answer because a red reflex is a **normal** clinical finding (the reflection of light off the vascularized choroid through the pupil). In albinism, the specific pathological finding is **Iris Transillumination**. Because the iris lacks pigment, light passes through the iris tissue itself rather than just the pupil, creating a "glow" or transillumination effect. While a red reflex is visible, it is not a specific *manifestation* or diagnostic sign of the disease in the way the other options are. **Explanation of Incorrect Options:** * **B. Decreased visual acuity:** This is a hallmark of albinism, primarily due to **foveal hypoplasia** (failure of the fovea to develop properly because melanin is required for normal retinal patterning). * **C. Photophobia:** The lack of pigment in the iris and RPE allows excessive, scattered light to enter the eye, causing significant light sensitivity. * **D. Nystagmus:** This is almost always present in ocular albinism, resulting from poor fixation due to foveal hypoplasia and abnormal decussation of optic nerve fibers at the chiasm. **High-Yield Clinical Pearls for NEET-PG:** * **Chiasmal Misrouting:** In albinism, there is an excessive decussation of temporal retinal fibers (more than 50% cross), which can be diagnosed via VEP (Visual Evoked Potential). * **Tyrosinase:** The most common enzyme deficiency in Oculocutaneous Albinism (OCA). * **Hermansky-Pudlak Syndrome:** Albinism associated with platelet dysfunction (bleeding diathesis). * **Chediak-Higashi Syndrome:** Albinism associated with immune deficiency and giant lysosomal granules.

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