Ocular Manifestations of Systemic Disorders Practice Questions

Q: Night blindness may be associated with:

All of the above. **Explanation:** Night blindness (Nyctalopia) is the inability to see clearly in low light or at night. It occurs due to the dysfunction of **rod photoreceptors** or a deficiency in **rhodopsin** (visual purple), the pigment required for vision in dim light. **1. Vitamin A Deficiency (Option A):** This is the most common cause of night blindness worldwide. Vitamin A (Retinol) is a precursor to 11-cis-retinal, which combines with opsin to form rhodopsin. Deficiency leads to a failure in the regeneration of this pigment, resulting in nyctalopia. **2. Cirrhosis of Liver (Option B):** The liver plays a critical role in Vitamin A metabolism. It is the primary site for the **storage** of Vitamin A (in hepatic stellate cells) and the **synthesis of Retinol Binding Protein (RBP)**, which transports the vitamin to the retina. In cirrhosis, impaired storage and transport lead to secondary Vitamin A deficiency, causing night blindness. **3. Malingering (Option C):** Night blindness is a subjective symptom. It is frequently feigned by malingerers (e.g., to avoid military night duty or for insurance claims). Since it is difficult to disprove without specialized tests like the **Electroretinogram (ERG)**, it remains a clinically recognized association. **High-Yield Clinical Pearls for NEET-PG:** * **Earliest Symptom of Vitamin A Deficiency:** Night blindness (Nyctalopia). * **Earliest Sign of Vitamin A Deficiency:** Conjunctival Xerosis. * **Other Causes of Nyctalopia:** Retinitis Pigmentosa (most common genetic cause), Pathological Myopia, Gyrate Atrophy, and Choroideremia. * **Objective Test:** The **Full-field ERG** (specifically the scotopic response) is the gold standard to objectively assess rod function and rule out malingering.

Q: Which of the following is a specific ocular finding in albinism?

Red reflex. **Explanation:** In albinism, the fundamental defect is a deficiency in melanin production. Melanin is essential in the eye for providing pigment to the iris and the Retinal Pigment Epithelium (RPE). **Why "Red Reflex" is the correct answer:** In a normal eye, the iris is opaque and blocks light. In albinism, the lack of iris pigment leads to **iris transillumination**. When light is directed into the eye, it passes through the translucent iris tissue and reflects off the vascular choroid, resulting in a prominent **red reflex** (often visible through the iris itself, not just the pupil). This is a hallmark clinical sign used to diagnose ocular albinism. **Analysis of Incorrect Options:** * **B, C, and D (Decreased visual acuity, Photophobia, Nystagmus):** While these are all commonly seen in albinism, they are **non-specific**. They occur in various other ocular conditions (e.g., congenital cataracts, aniridia, or achromatopsia). The question asks for a "specific" finding; the abnormal red reflex due to pigment deficiency is the most characteristic diagnostic feature of the albinotic eye. **High-Yield Clinical Pearls for NEET-PG:** * **Foveal Hypoplasia:** The most common cause of permanent decreased vision in albinos (melanin is required for normal foveal development). * **Misrouting of Optic Nerve Fibers:** There is an excessive decussation (crossing) of nerve fibers at the optic chiasm (more than the normal 53%). * **Tyrosinase:** The key enzyme often deficient in Oculocutaneous Albinism (OCA). * **Hermansky-Pudlak Syndrome:** Albinism associated with platelet dysfunction (bleeding diathesis).

Q: Which of the following statements regarding sickle cell disease is correct?

None of the above statements are correct.. **Explanation:** The correct answer is **D (None of the above)** because all the provided statements regarding sickle cell retinopathy are clinically inaccurate. **Analysis of Options:** * **Option A is incorrect:** Approximately **8–10%** of the Black population carries the sickle cell trait (AS), not 25%. * **Option B is incorrect:** Paradoxically, the most severe proliferative sickle cell retinopathy (PSCR) is seen in patients with **SC disease** and **S-Thal**, rather than SS disease. While SS disease has more severe systemic crises, the lower hematocrit and lower blood viscosity in SS disease may actually protect the peripheral retinal vessels compared to the higher viscosity seen in SC disease. * **Option C is incorrect:** Unlike diabetic retinopathy, neovascularization in sickle cell disease occurs in the **peripheral retina** (at the junction of perfused and non-perfused retina), leading to the characteristic "sea-fan" appearance. Neovascularization of the disc (NVD) is extremely rare in sickle cell disease. **High-Yield NEET-PG Pearls:** 1. **Goldberg Classification:** Used to stage PSCR. Stage I: Peripheral arteriolar occlusions; Stage II: Arteriovenous anastomoses; **Stage III: Sea-fan neovascularization** (most characteristic); Stage IV: Vitreous hemorrhage; Stage V: Retinal detachment. 2. **Salmon Patch Hemorrhage:** A pre-retinal/intra-retinal hemorrhage that turns orange-pink as it resorbs. 3. **Black Sunbursts:** Areas of RPE hypertrophy/hyperplasia following the resorption of a deep retinal hemorrhage. 4. **Comma Sign:** Conjunctival vascular abnormalities (comma-shaped capillary segments) are a common anterior segment finding.

Q: A young, tall, thin male with archnodactyly presents with ectopia lentis in both eyes. What is the most likely diagnosis?

Marfan's Syndrome. **Explanation:** The clinical presentation of a tall, thin male with **arachnodactyly** (long, slender fingers) and **ectopia lentis** (lens subluxation) is a classic description of **Marfan’s Syndrome**. This is an autosomal dominant connective tissue disorder caused by a mutation in the **FBN1 gene** on chromosome 15, leading to defective **fibrillin-1**. **Why Marfan’s Syndrome is correct:** In Marfan’s, the zonules (composed of fibrillin) are weak, leading to lens subluxation. The characteristic displacement is **superotemporal** (upwards and outwards), and the lens usually remains clear with intact accommodation. **Why the other options are incorrect:** * **Homocystinuria:** While patients are also tall and thin, the lens subluxation is typically **inferonasal** (downwards and inwards). Key differentiators include intellectual disability, increased risk of thromboembolism, and a positive cyanide-nitroprusside urine test. * **Marchesani’s Syndrome (Weill-Marchesani):** Patients are the opposite of Marfan’s—they are **short** with stubby fingers (brachydactyly). They present with microspherophakia (small, spherical lenses). * **Ehlers-Danlos Syndrome:** Primarily involves collagen defects. While it can cause blue sclera, angioid streaks, or keratoconus, ectopia lentis is rare. **High-Yield NEET-PG Pearls:** * **Most common cause of ectopia lentis:** Trauma (overall); Marfan’s (hereditary). * **Direction of subluxation:** Marfan’s = **Up**; Homocystinuria = **Down**. * **Systemic Risk:** Always screen Marfan’s patients for **Aortic Dissection/Aneurysm** via echocardiography. * **Mnemonic:** "Marfan's is **F**an-ing **U**p" (Fibrillin-1, Upward subluxation).

Q: What is the most common primary tumor site for intraocular metastasis in females?

Breast. **Explanation:** Intraocular metastasis is the most common form of intraocular malignancy in adults, occurring more frequently than primary uveal melanoma. The uveal tract, particularly the **choroid**, is the most common site for these metastases due to its high vascularity (supplied by the short posterior ciliary arteries). **1. Why Breast is Correct:** In females, **Breast Carcinoma** is the most common primary site, accounting for approximately **70-80%** of all intraocular metastases. The hematogenous spread typically reaches the choroid. Clinically, these present as creamy-yellow, placoid (flat), or dome-shaped subretinal lesions, often associated with exudative retinal detachment. **2. Why the other options are incorrect:** * **Ovary, Cervix, and Endometrium:** While gynecological malignancies can metastasize to the eye, they are statistically rare compared to breast cancer. Lung cancer is the second most common primary in females (and the most common in males), whereas gastrointestinal and urogenital tracts are much less frequent sources for ocular spread. **Clinical Pearls for NEET-PG:** * **Most common primary in Males:** Lung Cancer (Bronchogenic Carcinoma). * **Most common site of metastasis:** Choroid (90%), followed by the iris and ciliary body. * **Bilateralism:** Metastatic lesions are more likely to be bilateral and multifocal compared to primary uveal melanoma, which is usually unilateral and unifocal. * **Investigation of choice:** B-scan ultrasonography (shows high internal reflectivity) and FFA (shows early mottled fluorescence and late staining). * **Management:** Primarily palliative, involving systemic chemotherapy or external beam radiotherapy (EBRT).

Q: Anterior uveitis is most commonly associated with which HLA antigen?

HLA B27. **Explanation:** **HLA-B27** is a Class I surface antigen encoded by the B locus on chromosome 6. It is the most significant genetic marker associated with **Acute Anterior Uveitis (AAU)**. Approximately 50% of all cases of acute anterior uveitis are HLA-B27 positive. This association is part of a group of inflammatory disorders known as **Seronegative Spondyloarthropathies**, where the immune system targets the uveal tract and axial skeleton, likely through molecular mimicry or an altered immune response to certain pathogens. **Analysis of Options:** * **HLA-B27 (Correct):** It is strongly linked to the "B27 Syndrome," which includes Ankylosing Spondylitis (strongest association), Reiter’s Syndrome (Reactive Arthritis), Psoriatic Arthritis, and Inflammatory Bowel Disease. * **HLA-DR4:** This is primarily associated with **Rheumatoid Arthritis** and **Vogt-Koyanagi-Harada (VKH) syndrome**, not isolated acute anterior uveitis. * **HLA-B4 & HLA-D27:** These are not standard HLA associations for common ocular inflammatory conditions. (Note: D27 is often a distractor for B27). **High-Yield Clinical Pearls for NEET-PG:** * **Classic Presentation:** HLA-B27 uveitis is typically unilateral, acute in onset, recurrent, and characterized by a "plastic" aqueous humor with heavy fibrin formation. * **Gender Predilection:** More common in males (due to the link with Ankylosing Spondylitis). * **Other HLA Associations:** * **HLA-B51:** Behçet’s Disease (causes occlusive vasculitis and hypopyon uveitis). * **HLA-A29:** Birdshot Retinochoroidopathy. * **HLA-B7/DR2:** Presumed Ocular Histoplasmosis Syndrome (POHS).

Q: Bilateral paralysis of accommodation can occur in which of the following conditions?

All of the above. **Explanation:** Paralysis of accommodation (cycloplegia) occurs due to the involvement of the parasympathetic supply to the ciliary muscle. When this occurs bilaterally, it is typically a manifestation of a systemic neurological or metabolic insult. **Why "All of the Above" is Correct:** * **Diphtheria:** This is the most common cause of bilateral paralysis of accommodation. It is caused by the **Corynebacterium diphtheriae exotoxin**, which has a predilection for cranial nerves. It typically occurs 2–3 weeks after the throat infection. Notably, while accommodation is lost, the pupillary light reflex usually remains intact (dissociation). * **Diabetes Mellitus:** Hyperglycemia and metabolic fluctuations can lead to neuropathy affecting the third cranial nerve or direct osmotic changes in the lens. Bilateral weakness of accommodation is a recognized, though often transient, complication of poorly controlled diabetes. * **Syphilis:** Both congenital and acquired syphilis (neurosyphilis) can cause bilateral internal ophthalmoplegia. It is frequently associated with the **Argyll Robertson Pupil** (accommodation reflex present, but light reflex absent). **Clinical Pearls for NEET-PG:** * **Unilateral vs. Bilateral:** Unilateral paralysis is usually due to local trauma, viral infections (Herpes Zoster), or ciliary ganglionitis (Adie’s Pupil). Bilateral cases point toward systemic toxins or metabolic diseases. * **Drug-induced:** Systemic intake of atropine or other parasympatholytic drugs is a common differential for bilateral cycloplegia. * **Botulism:** Another high-yield cause of bilateral paralysis of accommodation accompanied by dilated, non-reactive pupils. * **Management:** Treatment is primarily directed at the underlying systemic cause; near vision can be temporarily corrected with convex lenses (plus lenses).

Q: Epidemic dropsy is characterised by all EXCEPT:

Hard exudates. **Explanation:** Epidemic dropsy is a clinical condition caused by the ingestion of mustard oil adulterated with **Argemone mexicana** oil. The toxic alkaloid responsible is **Sanguinarine**, which increases capillary permeability and causes widespread vasodilation. **Why "Hard Exudates" is the correct answer:** Hard exudates are composed of lipoprotein deposits resulting from chronic vascular leakage (commonly seen in Diabetic Retinopathy). In Epidemic Dropsy, the ocular pathology is primarily driven by **acute hypervolemia and massive capillary dilation** rather than chronic lipid leakage. Therefore, hard exudates are not a feature of this condition. **Analysis of Incorrect Options:** * **Tortuous retinal vessels & Periretinal hemorrhage:** Sanguinarine inhibits the Na+-K+ ATPase pump, leading to a rise in intracellular calcium and the release of prostaglandins. This causes extreme dilatation and tortuosity of retinal vessels and increased fragility, leading to superficial (periretinal) hemorrhages. * **Disc edema:** The systemic toxicity leads to increased capillary permeability and venous congestion, which manifests as bilateral optic disc edema (papilledema). **High-Yield Clinical Pearls for NEET-PG:** 1. **Glaucoma Type:** It causes a specific type of **Open Angle Glaucoma** characterized by very high Intraocular Pressure (IOP), but notably, there is **no shallowing of the anterior chamber** and **no pain/redness**. 2. **Mechanism of Glaucoma:** Increased production of aqueous humor and increased resistance to outflow due to dilated capillaries in the uveal tract. 3. **Systemic Features:** Bilateral pitting edema of legs, diarrhea, and cardiac failure. 4. **Diagnosis:** The **Nitric Acid Test** or Marquis test is used to detect Argemone oil in mustard oil.

Q: Which of the following is the most common cause of anterior uveitis?

Idiopathic. **Explanation:** Anterior uveitis (comprising iritis and iridocyclitis) is the most common form of intraocular inflammation. Epidemiological studies consistently show that despite extensive diagnostic workups, **Idiopathic** causes remain the most frequent, accounting for approximately **50% or more** of all cases. **Why the other options are incorrect:** * **HLA-B27 associated:** While this is the most common *identifiable* systemic association (linked to Ankylosing Spondylitis, Reiter’s Syndrome, and IBD), it still ranks second to idiopathic cases in overall prevalence. * **Sarcoidosis:** This is a significant cause of granulomatous uveitis (often presenting with "mutton-fat" keratic precipitates), but it is statistically less common than HLA-B27 or idiopathic varieties. * **Tuberculosis:** Though a major cause of infectious uveitis in developing countries like India, it is a specific etiology and does not surpass the frequency of idiopathic presentations. **High-Yield Clinical Pearls for NEET-PG:** * **Most common type of uveitis:** Anterior Uveitis. * **Most common systemic association:** HLA-B27 (typically presents as acute, unilateral, recurrent, non-granulomatous inflammation). * **Granulomatous vs. Non-granulomatous:** Idiopathic and HLA-B27 cases are usually non-granulomatous (small KPs), whereas Sarcoidosis and TB are typically granulomatous (large mutton-fat KPs). * **Classic Triad of Symptoms:** Pain, photophobia, and redness (ciliary congestion). * **Gold Standard Treatment:** Topical corticosteroids (e.g., Prednisolone acetate) and cycloplegics (e.g., Homatropine) to prevent synechiae.

Q: What is the cause of acute vision loss in a patient with alcoholic pancreatitis?

Puscher's retinopathy. **Explanation:** **Purtscher’s Retinopathy** is the correct answer. It is a rare but well-recognized microvascular occlusive syndrome characterized by sudden, painless vision loss. While classically associated with severe head trauma or chest compression, it is a known complication of **acute pancreatitis**. The underlying pathophysiology involves the activation of the complement cascade (specifically C5a), leading to leukocyte aggregation and the formation of microemboli (granulocyte/platelet/fibrin clumps). These emboli cause infarction of the retinal nerve fiber layer, manifesting clinically as multiple **Purtscher flecken** (areas of retinal whitening) and cotton-wool spots surrounding the optic nerve. **Why other options are incorrect:** * **Sudden alcohol withdrawal:** Typically presents with systemic neurological symptoms (tremors, seizures, delirium tremens) rather than acute structural retinal pathology or vision loss. * **Acute congestive glaucoma:** Presents with a painful red eye, corneal edema, and a mid-dilated pupil, rather than the painless retinal findings associated with pancreatitis. * **Central retinal artery occlusion (CRAO):** While it causes sudden vision loss, it is usually due to an embolus from the heart or carotid arteries. In CRAO, the entire retina is pale with a "cherry-red spot," whereas Purtscher’s shows localized patches of whitening (flecken). **High-Yield Clinical Pearls for NEET-PG:** * **Triad of Purtscher’s:** Sudden vision loss + Purtscher flecken + Cotton-wool spots. * **Common Causes:** Trauma (most common), Acute Pancreatitis, Fat Embolism Syndrome, and Systemic Lupus Erythematosus (SLE). * **Diagnosis:** Primarily clinical; Fundus Fluorescein Angiography (FFA) shows areas of capillary non-perfusion. * **Management:** Observation and treatment of the underlying systemic condition (e.g., managing the pancreatitis).

Question 1

Night blindness may be associated with:

Accepted Answer

All of the above

Answer

Vitamin A deficiency

Answer

Cirrhosis of liver

Answer

Malingering

Question 2

Which of the following is a specific ocular finding in albinism?

Accepted Answer

Red reflex

Answer

Decreased visual activity

Answer

Photophobia

Answer

Nystagmus

Question 3

Which of the following statements regarding sickle cell disease is correct?

Accepted Answer

None of the above statements are correct.

Answer

Approximately 25% of the black population has sickle cell trait.

Answer

The most severe form of sickle cell retinopathy is associated with sickle cell disease (SS disease).

Answer

The optic disc is the first site of neovascularization in patients with severe retinal ischemia.

Question 4

A young, tall, thin male with archnodactyly presents with ectopia lentis in both eyes. What is the most likely diagnosis?

Accepted Answer

Marfan's Syndrome

Answer

Marchesani's Syndrome

Answer

Homocystinuria

Answer

Ehlers-Danlos syndrome

Question 5

What is the most common primary tumor site for intraocular metastasis in females?

Accepted Answer

Breast

Answer

Ovary

Answer

Cervix

Answer

Endometrium

Question 6

Anterior uveitis is most commonly associated with which HLA antigen?

Accepted Answer

HLA B27

Answer

HLA DR4

Answer

HLA D27

Answer

HLA B4

Question 7

Bilateral paralysis of accommodation can occur in which of the following conditions?

Accepted Answer

All of the above

Answer

Diabetes

Answer

Syphilis

Answer

Diphtheria

Question 8

Epidemic dropsy is characterised by all EXCEPT:

Accepted Answer

Hard exudates

Answer

Disc edema

Answer

Peri retinal haemorrhage

Answer

Tortuous retinal vessels

Question 9

Which of the following is the most common cause of anterior uveitis?

Accepted Answer

Idiopathic

Answer

HLA-B27 associated

Answer

Sarcoidosis

Answer

Tuberculosis

Question 10

What is the cause of acute vision loss in a patient with alcoholic pancreatitis?

Accepted Answer

Puscher's retinopathy

Answer

Sudden alcohol withdrawal

Answer

Acute congestive glaucoma

Answer

Central retinal artery occlusion (CRAO)

Ocular Manifestations of Systemic Disorders — MCQs

Ocular Manifestations of Systemic Disorders — MCQs

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