Ocular Manifestations of Systemic Disorders — MCQs

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

Question 51: Which of the following statements regarding sickle cell disease is correct?

A. Approximately 25% of the black population has sickle cell trait.
B. The most severe form of sickle cell retinopathy is associated with sickle cell disease (SS disease).
C. The optic disc is the first site of neovascularization in patients with severe retinal ischemia.
D. None of the above statements are correct. (Correct Answer)

Explanation: **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.

Question 52: A young, tall, thin male with archnodactyly presents with ectopia lentis in both eyes. What is the most likely diagnosis?

A. Marfan's Syndrome (Correct Answer)
B. Marchesani's Syndrome
C. Homocystinuria
D. Ehlers-Danlos syndrome

Explanation: **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).

Question 53: Dalrymple's sign is seen in which of the following conditions?

A. Thyroid ophthalmopathy (Correct Answer)
B. Orbital cellulitis
C. Choroidal melanoma
D. Posterior vitreal detachment

Explanation: **Explanation:** **Dalrymple’s sign** is a classic clinical feature of **Thyroid Ophthalmopathy** (Graves' Orbitopathy). It refers to the **widening of the palpebral fissure** caused by retraction of the upper eyelid in the primary position of gaze. This occurs due to increased sympathetic activity and fibrotic changes in the Levator Palpebrae Superioris and Müller’s muscle. **Analysis of Options:** * **Thyroid Ophthalmopathy (Correct):** This is the most common cause of both unilateral and bilateral proptosis in adults. Dalrymple’s sign is one of the earliest and most frequent signs of the disease. * **Orbital Cellulitis:** While this presents with proptosis and lid edema, it is an acute infectious process characterized by pain, fever, and restricted ocular motility, rather than specific lid retraction signs. * **Choroidal Melanoma:** This is an intraocular malignancy. While it may cause secondary glaucoma or retinal detachment, it does not typically present with lid retraction signs. * **Posterior Vitreal Detachment (PVD):** This is a common age-related degenerative change of the vitreous humor, presenting with floaters and photopsia, with no external ocular signs like lid retraction. **High-Yield Clinical Pearls for NEET-PG:** * **Von Graefe’s Sign:** Lid lag on downward movement of the eyeball (most specific sign). * **Stellwag’s Sign:** Infrequent or incomplete blinking. * **Joffroy’s Sign:** Absence of forehead wrinkling on upward gaze. * **Mobius Sign:** Inability to maintain convergence. * **NOSPECS Classification:** Used to grade the severity of Thyroid Eye Disease (0=No signs/symptoms, 1=Only signs, 2=Soft tissue involvement, 3=Proptosis, 4=Extraocular muscle involvement, 5=Corneal involvement, 6=Sight loss).

Question 54: A patient with HIV infection complains of rapidly progressive painless visual loss. Fundus shows exudates and haemorrhage especially along blood vessels. What is the treatment of choice in this case?

A. Amphotericin B
B. Pentamidine
C. Acyclovir
D. Ganciclovir (Correct Answer)

Explanation: ### Explanation **Diagnosis: CMV Retinitis** The clinical presentation of rapidly progressive, painless vision loss in an HIV-positive patient (typically with a CD4 count <50 cells/mm³) featuring exudates and hemorrhages along the retinal vessels is characteristic of **Cytomegalovirus (CMV) Retinitis**. The classic funduscopic appearance is often described as a **"Pizza-pie"** or **"Cottage cheese and ketchup"** retinopathy. **Why Ganciclovir is the Correct Answer:** * **Ganciclovir** is the first-line treatment for CMV retinitis. It is a nucleoside analogue that inhibits viral DNA polymerase. * It can be administered intravenously or via intravitreal implants/injections for immediate local control. * **Valganciclovir** (the oral prodrug) is also used for induction and maintenance therapy. **Why Other Options are Incorrect:** * **Amphotericin B:** This is an antifungal agent used for systemic fungal infections like Cryptococcosis or Candidiasis. While HIV patients are prone to fungal infections, the vascular "pizza-pie" appearance is specific to CMV. * **Pentamidine:** This is used to treat *Pneumocystis jirovecii* pneumonia (PCP). It has no efficacy against viral retinitis. * **Acyclovir:** While an antiviral, it is primarily used for Herpes Simplex (HSV) and Varicella Zoster (VZV). It is ineffective against CMV because CMV lacks the viral thymidine kinase required to activate acyclovir. **High-Yield Clinical Pearls for NEET-PG:** * **Most common** opportunistic ocular infection in AIDS: CMV Retinitis. * **CD4 Threshold:** Usually occurs when CD4 count is **<50 cells/mm³**. * **Alternative treatments:** Foscarnet or Cidofovir (used if there is ganciclovir resistance). * **Key Complication:** Retinal detachment is a common sight-threatening complication of CMV retinitis. * **Differential:** Acute Retinal Necrosis (ARN) is caused by HSV/VZV and is usually painful, unlike CMV retinitis.

Question 55: Which of the following types of entropion is not a recognized clinical entity?

A. Spastic entropion
B. Paralytic entropion (Correct Answer)
C. Cicatricial entropion
D. Involutional entropion

Explanation: **Explanation:** Entropion is the inward turning of the eyelid margin. To understand why **Paralytic Entropion** is not a recognized entity, one must look at the anatomy of the orbicularis oculi muscle. 1. **Why Paralytic Entropion is the correct answer:** Paralysis of the 7th cranial nerve (Facial nerve) leads to loss of tone in the orbicularis oculi. Because this muscle is responsible for keeping the eyelid apposed to the globe, its paralysis causes the lid to fall away from the eye (outward turning), resulting in **Ectropion**, not Entropion. Therefore, "Paralytic Entropion" does not exist clinically. 2. **Analysis of Incorrect Options:** * **Spastic Entropion:** Occurs due to excessive contraction of the preseptal orbicularis muscle, often triggered by ocular irritation or prolonged patching. * **Cicatricial Entropion:** Caused by scarring of the palpebral conjunctiva (e.g., in Trachoma or Stevens-Johnson Syndrome), which pulls the lid margin inward. * **Involutional (Senile) Entropion:** The most common type, caused by age-related laxity of the canthal tendons and dehiscence of the lower lid retractors. **High-Yield Clinical Pearls for NEET-PG:** * **Jones Procedure:** A common surgical repair for involutional entropion (tucking of the inferior secondary retractors). * **Trachoma:** The most common cause of cicatricial entropion worldwide (Arlt’s line and Herbert’s pits are key diagnostic signs). * **Ectropion vs. Entropion:** Remember: **Paralysis = Ectropion**; **Scarring/Spasm = Entropion.** * **Essential Blepharospasm:** Can lead to spastic entropion due to involuntary forceful eyelid closure.

Question 56: What is the common cause of sudden blindness in a young diabetic female?

A. Glaucoma
B. Vitreous defects (Correct Answer)
C. Papilledema
D. Cataract

Explanation: **Explanation:** The correct answer is **Vitreous defects** (specifically, **Vitreous Hemorrhage**). In a young patient with diabetes, the most likely cause of sudden, painless loss of vision is a vitreous hemorrhage. This occurs due to **Proliferative Diabetic Retinopathy (PDR)**, where chronic ischemia leads to the release of VEGF and the formation of fragile new vessels (neovascularization). These vessels can rupture easily, bleeding into the vitreous cavity and causing an acute drop in vision. **Analysis of Options:** * **Vitreous defects (Correct):** As explained, neovascularization at the disc (NVD) or elsewhere (NVE) leads to vitreous hemorrhage, the most common cause of sudden blindness in PDR. * **Glaucoma:** While diabetes is a risk factor for Neovascular Glaucoma, this typically presents with a painful red eye and gradual vision loss rather than sudden blindness [1]. * **Papilledema:** This refers to optic disc swelling due to increased intracranial pressure [2]. While it can cause transient visual obscurations, it is not a primary complication of diabetes. * **Cataract:** Diabetics are prone to "Snowflake cataracts" or early-onset senile cataracts, but these cause a **gradual**, progressive blurring of vision, not sudden blindness. **Clinical Pearls for NEET-PG:** * **Sudden painless loss of vision in DM:** Think Vitreous Hemorrhage or Central Retinal Vein Occlusion (CRVO). * **Sudden painful loss of vision in DM:** Think Neovascular Glaucoma. * **First clinical sign of Diabetic Retinopathy:** Microaneurysms (located in the inner nuclear layer). * **Investigation of choice for Vitreous Hemorrhage:** B-Scan Ultrasound (to rule out underlying retinal detachment).

Question 57: A person is diagnosed with diabetes at 45 years of age. When should a dilated fundoscopic examination be recommended?

A. Immediately (Correct Answer)
B. Before the age of 50 years
C. At the age of 50 years
D. When the patient complains of dimness of vision

Explanation: **Explanation:** The correct answer is **Immediately** because this patient has been diagnosed with diabetes at age 45, which strongly suggests **Type 2 Diabetes Mellitus (T2DM)**. **Why Option A is Correct:** In T2DM, the exact onset of the disease is often unknown and may have preceded the clinical diagnosis by several years. Consequently, diabetic retinopathy (DR) may already be present at the time of diagnosis. Current clinical guidelines (AAO and ADA) mandate a dilated fundoscopic examination **at the time of diagnosis** for all Type 2 diabetics to screen for pre-existing retinal damage. **Why Other Options are Incorrect:** * **Options B & C:** Waiting until age 50 or any arbitrary timeframe is dangerous. Irreversible vision loss from macular edema or proliferative changes can occur silently before the patient reaches these milestones. * **Option D:** Diabetic retinopathy is often **asymptomatic** in its early, treatable stages. Waiting for "dimness of vision" usually means the disease has progressed to advanced stages (e.g., vitreous hemorrhage or macular edema), where the prognosis is poorer. **High-Yield Clinical Pearls for NEET-PG:** * **Type 1 DM Screening:** The first fundus exam should be done **5 years after diagnosis** (as it rarely develops before puberty or within 5 years of onset). * **Type 2 DM Screening:** At the **time of diagnosis**, then annually. * **Pregnancy & DM:** Diabetic women who become pregnant should have an exam in the **first trimester** and close follow-up throughout pregnancy, as it can rapidly accelerate DR. * **First Sign of DR:** Microaneurysms in the Inner Nuclear Layer (earliest clinical sign).

Question 58: Anterior uveitis is most commonly associated with which HLA antigen?

A. HLA DR4
B. HLA D27
C. HLA B4
D. HLA B27 (Correct Answer)

Explanation: **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).

Question 59: Bilateral paralysis of accommodation can occur in which of the following conditions?

A. Diabetes
B. Syphilis
C. Diphtheria
D. All of the above (Correct Answer)

Explanation: **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).

Question 60: In Iridocyclitis, what is the typical appearance of the pupil?

A. Dilated
B. Constricted
C. Constricted and irregular (Correct Answer)
D. No change in size of pupil

Explanation: **Explanation:** In **Iridocyclitis** (Anterior Uveitis), the pupil is typically **constricted and irregular**. This occurs due to two primary mechanisms: 1. **Constriction (Miosis):** Inflammation of the iris leads to irritation and spasm of the **sphincter pupillae** muscle. Additionally, the engorgement of iris blood vessels (ciliary congestion) further narrows the pupillary aperture. 2. **Irregularity:** The inflammatory process results in the exudation of proteins and fibrin into the aqueous humor. This "sticky" exudate causes the iris to adhere to the anterior lens capsule, a condition known as **posterior synechiae**. These adhesions occur at discrete points, preventing uniform pupillary movement and resulting in an irregular shape (festooned pupil), especially when dilation is attempted. **Analysis of Incorrect Options:** * **A. Dilated:** A dilated pupil is characteristic of **Acute Congestive Glaucoma** (vertically oval) or the use of mydriatics. In inflammation, the pupil remains small due to muscle spasm. * **B. Constricted (only):** While the pupil is initially small (miotic), "constricted and irregular" is a more specific and accurate description of the clinical presentation in iridocyclitis due to the formation of synechiae. * **D. No change:** Significant intraocular inflammation always affects pupillary dynamics and size. **High-Yield Clinical Pearls for NEET-PG:** * **Festooned Pupil:** An irregular pupil seen after instilling a mydriatic in a patient with posterior synechiae. * **Aqueous Flare/Cells:** The hallmark sign of active anterior uveitis on slit-lamp examination. * **Keratic Precipitates (KPs):** Inflammatory cells deposited on the corneal endothelium; "Mutton-fat" KPs suggest granulomatous uveitis (e.g., Sarcoidosis, TB). * **Management:** The drug of choice is **Atropine (1%)**, which relieves ciliary spasm (reducing pain) and prevents/breaks synechiae.

Practice by Chapter

Diabetes Mellitus

Practice Questions

Hypertension

Practice Questions

Autoimmune Disorders

Practice Questions

Thyroid Disease

Practice Questions

HIV and AIDS

Practice Questions

Hematological Disorders

Practice Questions

Neurological Disorders

Practice Questions

Dermatological Conditions

Practice Questions

Pregnancy-Related Eye Changes

Practice Questions

Metabolic Disorders

Practice Questions

Ocular Toxicity of Systemic Medications

Practice Questions

Infectious Systemic Diseases

Practice Questions

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