Ocular Manifestations of Systemic Disorders — MCQs

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

Question 381: Which of the following is NOT a feature of Vogt-Koyanagi-Harada syndrome?

A. Sensorineural hearing loss
B. Normal IQ (Correct Answer)
C. Vitiligo
D. Hyperpigmentation

Explanation: **Explanation:** **Vogt-Koyanagi-Harada (VKH) syndrome** is a multisystem autoimmune disorder characterized by T-cell mediated destruction of melanocytes. It primarily affects tissues rich in melanocytes, including the eyes, inner ear, meninges, and skin. **Why "Normal IQ" is the correct answer:** VKH syndrome is characterized by neurological involvement in its early stages (Meningitic phase), presenting as headache, neck stiffness, and CSF pleocytosis. However, it **does not cause intellectual disability or cognitive impairment.** Therefore, while a patient with VKH has a "Normal IQ," it is not a diagnostic feature or a clinical manifestation of the disease process itself. **Analysis of Incorrect Options:** * **Sensorineural hearing loss:** Occurs due to the destruction of melanocytes in the inner ear (stria vascularis). It is a classic feature of the Dysacusis phase. * **Vitiligo & Poliosis:** These are hallmark integumentary findings in the chronic/convalescent stage, resulting from the loss of skin and hair pigmentation. * **Hyperpigmentation:** This is **NOT** a feature of VKH; rather, the syndrome is defined by **depigmentation** (Vitiligo, Poliosis, and Sugiura sign—perilimbic vitiligo). *Note: In the context of this specific MCQ, "Normal IQ" is the intended distractor as it is a non-pathological state, whereas the other options (except hyperpigmentation) are classic clinical signs.* **High-Yield Clinical Pearls for NEET-PG:** 1. **Four Phases:** Prodromal (flu-like), Uveitic (bilateral exudative retinal detachment), Convalescent (Sunset glow fundus), and Chronic recurrent. 2. **Sunset Glow Fundus:** An orange-red discoloration of the fundus due to depigmentation of the RPE. 3. **Sugiura Sign:** Perilimbic vitiligo (most common in Japanese patients). 4. **Treatment:** High-dose systemic corticosteroids are the mainstay of therapy.

Question 382: A 60-year-old man presented with watering from his left eye for 1 year. Syringing revealed a patent drainage system. The rest of the ocular examination was normal. A provisional diagnosis of lacrimal pump failure was made. Confirmation of the diagnosis would be by:

A. Dacryoscintigraphy (Correct Answer)
B. Dacryocystography
C. Pressure syringing
D. Canaliculus irrigation test

Explanation: ### Explanation **Concept:** The patient presents with **epiphora** (watering) despite a **patent lacrimal drainage system** (confirmed by syringing). This clinical scenario indicates a **functional nasolacrimal duct obstruction**, most commonly due to **lacrimal pump failure**. This occurs when the orbicularis oculi muscle fails to create the negative pressure required to "suck" tears into the lacrimal sac, often seen in elderly patients or those with facial nerve palsy. **Why Dacryoscintigraphy is Correct:** **Dacryoscintigraphy (Radionuclide Cystography)** is the gold standard for diagnosing functional obstruction. It involves instilling a radioactive tracer (Technetium-99m) into the conjunctival sac and monitoring its movement with a gamma camera under physiological conditions. Unlike syringing, which uses manual pressure, this test assesses the **dynamic, natural flow** of tears. If the drainage system is patent on syringing but the tracer fails to move, lacrimal pump failure is confirmed. **Why Other Options are Incorrect:** * **B. Dacryocystography (DCG):** This involves injecting radiopaque dye. It is excellent for visualizing **anatomical** obstructions or structural abnormalities (like diverticula or stones) but does not assess the physiological pump function. * **C. Pressure Syringing:** This is used to overcome minor obstructions or to check for patency. Since the question states syringing is already patent, repeating it adds no diagnostic value for pump failure. * **D. Canaliculus Irrigation Test:** This is a component of standard syringing used to localize an anatomical block (e.g., canalicular stenosis). It cannot evaluate the dynamic physiological pump. **NEET-PG High-Yield Pearls:** * **Jones Test I:** Differentiates hypersecretion from true obstruction (Positive = Patent). * **Jones Test II:** Localizes the site of partial anatomical obstruction (requires syringing). * **Primary Lacrimal Pump:** Orbicularis oculi (Horner’s muscle). * **Most common cause of Epiphora in elderly with patent syringing:** Lacrimal pump failure/Laxity of the lower lid.

Question 383: In a patient with AIDS, what typically causes chorioretinitis?

A. Cytomegalovirus (Correct Answer)
B. Toxoplasma gondii
C. Cryptococcus neoformans
D. Histoplasma capsulatum

Explanation: **Explanation:** **Cytomegalovirus (CMV)** is the most common cause of opportunistic ocular infection and blindness in patients with AIDS, typically occurring when the **CD4+ T-cell count falls below 50 cells/mm³**. CMV retinitis is characterized by a full-thickness retinal necrosis and vasculitis. Classically, it presents as the **"Pizza-pie" or "Cottage cheese and ketchup" appearance**, consisting of fluffy white retinal opacification (necrosis) associated with prominent retinal hemorrhages. **Analysis of Incorrect Options:** * **Toxoplasma gondii:** While it causes chorioretinitis, it is less common than CMV in AIDS patients. It typically presents as a "headlight in the fog" appearance due to intense overlying vitritis, whereas CMV retinitis usually has minimal vitreous inflammation (cold vitritis). * **Cryptococcus neoformans:** This primarily causes fungal meningitis in AIDS. Ocular involvement is usually secondary to increased intracranial pressure (papilledema) or direct optic nerve involvement rather than primary chorioretinitis. * **Histoplasma capsulatum:** Causes Presumed Ocular Histoplasmosis Syndrome (POHS), characterized by "punched-out" chorioretinal scars and peripapillary atrophy. It is not specifically associated with the late stages of AIDS. **Clinical Pearls for NEET-PG:** * **Treatment of Choice:** Intravenous **Ganciclovir** or Valganciclovir. Foscarnet and Cidofovir are alternatives. * **Frosted Branch Angiitis:** A rare clinical variant of CMV retinitis showing severe perivascular whitening. * **Immune Recovery Uveitis (IRU):** An inflammatory response that occurs in AIDS patients with CMV retinitis after starting HAART, as the immune system recovers.

Question 384: Iritis roseata is seen in which of the following conditions?

A. Leprosy
B. Syphilis (Correct Answer)
C. Tuberculosis
D. Sarcoidosis

Explanation: **Explanation:** **Iritis roseata** is a classic ocular manifestation of **Secondary Syphilis**. It is characterized by the formation of small, hyperemic, reddish nodules on the iris surface. These nodules represent localized accumulations of *Treponema pallidum* and dilated capillaries. 1. **Why Syphilis is correct:** In the secondary stage of syphilis, the iris can exhibit three progressive vascular stages: * **Iritis roseata:** Early stage with small, red, transient capillary tufts. * **Iritis papulosa:** Larger, yellowish-red nodules (papules). * **Iritis nodosa:** Large, persistent nodules that may lead to extensive synechiae. 2. **Why other options are incorrect:** * **Leprosy:** Typically presents with "pearls" on the iris (Iris pearls), which are small, white, waxy outgrowths, or chronic low-grade iridocyclitis leading to iris atrophy. * **Tuberculosis:** Characterized by "Miliary tubercles" of the iris (yellowish-gray nodules) or large granulomas (tuberculomas), usually associated with mutton-fat keratic precipitates. * **Sarcoidosis:** Classically presents with "Busacca nodules" (on the iris stroma) and "Koeppe nodules" (at the pupillary margin), often accompanied by "candle-wax drippings" (perivasculitis) on the retina. **High-Yield Clinical Pearls for NEET-PG:** * **Syphilis** is known as the "Great Imitator" because it can present as any form of uveitis (anterior, intermediate, posterior, or panuveitis). * **Salt and pepper fundus** is a classic finding in congenital syphilis. * **Argyll Robertson Pupil** (Accommodation reflex present, Light reflex absent) is a hallmark of neurosyphilis. * **Interstitial Keratitis** is part of Hutchinson’s triad in congenital syphilis.

Question 385: In a patient with anterior uveitis, decrease in vision due to involvement of the posterior segment can occur because of which of the following?

A. Exudative retinal detachment
B. Cystoid macular edema (Correct Answer)
C. Vitreal floaters
D. Inflammatory disc edema

Explanation: **Explanation:** In patients with **Anterior Uveitis** (Iridocyclitis), the primary pathology is located in the anterior segment. However, inflammatory mediators (prostaglandins, cytokines) can diffuse posteriorly through the vitreous, leading to complications in the posterior segment. **Why Cystoid Macular Edema (CME) is the correct answer:** CME is the **most common cause of significant and permanent visual loss** in patients with chronic or recurrent anterior uveitis. The inflammatory mediators cause a breakdown of the blood-aqueous and blood-retinal barriers, leading to fluid accumulation in the outer plexiform (Henle’s) layer of the macula. This results in a characteristic "petaloid" appearance on Fluorescein Angiography. **Analysis of Incorrect Options:** * **A. Exudative retinal detachment:** This is typically a feature of **Posterior Uveitis** (e.g., Vogt-Koyanagi-Harada syndrome or Sympathetic Ophthalmitis) rather than simple anterior uveitis. * **C. Vitreal floaters:** While floaters (due to inflammatory cells in the anterior vitreous) are common in uveitis, they cause a "blurring" or "annoyance" rather than a true decrease in visual acuity. * **D. Inflammatory disc edema:** Also known as papillitis, this can occur in severe inflammation, but it is much less common than CME and is usually not the primary cause of vision loss in isolated anterior uveitis. **NEET-PG High-Yield Pearls:** * **Most common cause of vision loss in Uveitis:** Cystoid Macular Edema (CME). * **Drug of choice for CME in Uveitis:** Topical or systemic NSAIDs and Corticosteroids. * **Irvine-Gass Syndrome:** CME occurring specifically after cataract surgery. * **Other causes of vision loss in Anterior Uveitis:** Complicated cataract (most common cause of gradual loss) and secondary glaucoma.

Question 386: A 25-year-old male presents with sudden painless loss of vision. Ocular and systemic examinations are normal. What is the probable diagnosis?

A. Retinal detachment
B. Eale's disease
C. Glaucoma
D. Optic neuritis (Correct Answer)

Explanation: **Explanation:** The clinical presentation of **sudden painless loss of vision** in a young adult with a **normal-looking fundus** (implied by "normal ocular examination") is the classic description of **Retrobulbar Optic Neuritis**. **1. Why Optic Neuritis is correct:** In the early stages of retrobulbar neuritis (the most common form in adults), the inflammation occurs behind the eyeball. Consequently, the optic disc appears normal initially—leading to the famous clinical adage: *"The patient sees nothing and the doctor sees nothing."* While the question states the examination is normal, in a clinical setting, one would expect a **Relative Afferent Pupillary Defect (RAPD)**, which is the most important objective sign. **2. Why other options are incorrect:** * **Retinal Detachment:** Usually presents with "flashes and floaters" (photopsia) followed by a curtain-like vision loss. An ophthalmoscopic exam would reveal a greyish, elevated retina, not a "normal" examination. * **Eale’s Disease:** This is an idiopathic peripheral perivasculitis. It typically presents with sudden painless vision loss due to **Vitreous Hemorrhage**. On examination, the doctor would see a diminished red reflex and blood in the vitreous, not a normal fundus. * **Glaucoma:** Acute Angle Closure Glaucoma presents with sudden vision loss, but it is **extremely painful** and associated with a red eye, mid-dilated pupil, and hazy cornea. Chronic glaucoma is painless but causes gradual, not sudden, vision loss. **Clinical Pearls for NEET-PG:** * **Demographics:** Most common in females aged 20–40 years. * **Association:** Strongly associated with **Multiple Sclerosis** (demyelination). * **Symptoms:** Sudden vision loss, reduced color vision (**Dyschromatopsia**—red desaturation), and pain on ocular movement. * **Investigation of Choice:** MRI of the brain and orbit (to check for demyelinating plaques). * **Treatment:** Follow the **ONTT (Optic Neuritis Treatment Trial)** guidelines: IV Methylprednisolone followed by oral steroids. (Note: Oral steroids alone are contraindicated as they increase the rate of recurrence).

Question 387: Which of the following conditions is associated with the Amsler sign?

A. Fuchs heterochromatic iridocyclitis (Correct Answer)
B. Posner-Schlossman syndrome
C. Uveal effusion syndrome
D. None of the above

Explanation: **Explanation:** **Fuchs Heterochromatic Iridocyclitis (FHI)** is the correct answer. The **Amsler sign** (also known as the Amsler-Verrey sign) refers to the development of a filiform hemorrhage in the anterior chamber angle following paracentesis or minor trauma to the globe (such as during cataract surgery or even applanation tonometry). * **Mechanism:** In FHI, there is chronic low-grade inflammation leading to the formation of fragile, fine, neovascular vessels in the angle of the anterior chamber. These vessels lack a proper muscularis layer and bleed easily when the intraocular pressure (IOP) is suddenly lowered. **Analysis of Incorrect Options:** * **Posner-Schlossman Syndrome (Glaucomatocyclitic Crisis):** Characterized by recurrent episodes of very high IOP and mild anterior uveitis. While it involves the anterior chamber, it is not associated with fragile angle vessels or the Amsler sign. * **Uveal Effusion Syndrome:** An idiopathic condition involving ciliary body detachment and exudative retinal detachment, typically seen in nanophthalmic eyes. It does not involve the specific angle neovascularization seen in FHI. **High-Yield Clinical Pearls for NEET-PG:** * **Triad of FHI:** Heterochromia iridis (the affected eye is usually lighter), cataract (posterior subcapsular), and fine, stellate Keratic Precipitates (KPs) distributed over the entire corneal endothelium. * **Key Feature:** FHI is typically unilateral, chronic, and **asymptomatic** (no redness or pain), often diagnosed incidentally. * **Management:** Unlike other forms of uveitis, FHI does **not** respond well to topical steroids and does not typically lead to posterior synechiae.

Question 388: What is the increased risk of blindness in a diabetic patient compared to a non-diabetic patient?

A. 5 times
B. 10 times
C. 15 times
D. 25 times (Correct Answer)

Explanation: **Explanation:** **1. Why Option D is Correct:** According to epidemiological data and classic ophthalmology textbooks (such as Parsons' and Khurana), a person with diabetes mellitus is **25 times** more likely to suffer from legal blindness compared to a non-diabetic individual of the same age and sex. This significantly elevated risk is primarily due to **Diabetic Retinopathy (DR)**, which is a leading cause of preventable blindness worldwide. The pathology involves microvascular damage leading to capillary non-perfusion, ischemia-induced neovascularization (Proliferative DR), and macular edema. **2. Why Other Options are Incorrect:** * **Options A (5x) and B (10x):** These figures significantly underestimate the cumulative risk. While diabetes increases the risk of other ocular conditions (like cataracts) by 2–5 times, the overall risk of total blindness is much higher due to the irreversible nature of untreated retinal complications. * **Option C (15x):** While 15 times is a high risk, it does not reach the statistically established threshold of 25 times cited in standard medical literature for NEET-PG. **3. Clinical Pearls & High-Yield Facts for NEET-PG:** * **Duration of Diabetes:** This is the most important risk factor for the development of DR. After 20 years of diabetes, nearly 99% of Type 1 and 60% of Type 2 patients will show some signs of retinopathy. * **First Clinical Sign:** Microaneurysms (located in the inner nuclear layer). * **First Pathological Sign:** Loss of pericytes and basement membrane thickening. * **Classification:** DR is classified into Non-Proliferative (NPDR) and Proliferative (PDR). The hallmark of PDR is **Neovascularization** (NVD/NVE). * **Most Common Cause of Vision Loss:** Diabetic Macular Edema (DME) is the most common cause of decreased vision in NPDR, while Vitreous Hemorrhage and Tractional Retinal Detachment are major causes in PDR.

Question 389: A 40-year-old male patient complains of diminished vision during night and dryness of eyes. The patient also has a history of recurrent bacterial infections. Ophthalmic examination reveals white triangular plaques on the conjunctiva. This patient is suffering from a deficiency of:

A. Vitamin D
B. Vitamin B
C. Vitamin A (Correct Answer)
D. Vitamin C

Explanation: ### Explanation The clinical presentation of **night blindness (Nyctalopia)**, **conjunctival dryness (Xerosis)**, and **white triangular plaques (Bitot’s spots)** is pathognomonic for **Vitamin A deficiency**. **1. Why Vitamin A is the correct answer:** * **Night Blindness:** Vitamin A (Retinol) is a precursor to **Rhodopsin**, the photopigment in retinal rods responsible for vision in low light. Deficiency leads to impaired dark adaptation. * **Bitot’s Spots:** These are the "white triangular plaques" mentioned. They consist of keratinized epithelial debris and *Corynebacterium xerosis* gas bubbles, typically located on the bulbar conjunctiva in the interpalpebral aperture. * **Immunity:** Vitamin A is essential for maintaining epithelial integrity and immune function. Deficiency leads to squamous metaplasia of mucous membranes, explaining the patient's **recurrent bacterial infections**. **2. Why other options are incorrect:** * **Vitamin D:** Primarily affects calcium metabolism; deficiency causes Rickets (children) or Osteomalacia (adults), not ocular surface changes. * **Vitamin B:** Deficiency (e.g., B1, B2, B12) can cause optic neuropathy or angular stomatitis, but not Bitot’s spots or night blindness. * **Vitamin C:** Deficiency leads to Scurvy, characterized by collagen defects and hemorrhages (e.g., subconjunctival hemorrhage), not keratinization. **3. NEET-PG High-Yield Pearls (WHO Classification of Xerophthalmia):** * **X1A:** Conjunctival xerosis * **X1B:** Bitot’s spots * **X2:** Corneal xerosis * **X3A/X3B:** Corneal ulceration/Keratomalacia (involves <1/3 or >1/3 of cornea) * **XN:** Night blindness * **XF:** Xerophthalmic fundus (small white retinal lesions) * **XS:** Corneal scarring

Question 390: What is the earliest sign of anterior uveitis?

A. Aqueous flare (Correct Answer)
B. Keratic precipitates
C. Constriction of pupil
D. Raised intraocular pressure

Explanation: **Explanation:** The earliest sign of anterior uveitis is **Aqueous flare**. This occurs due to the breakdown of the **blood-aqueous barrier**, which allows plasma proteins to leak into the normally clear aqueous humor. When viewed with a slit-lamp beam (Tyndall effect), these proteins scatter light, appearing as a "haze" or "flare." While aqueous cells (leukocytes) indicate active inflammation, flare is often the first detectable change. **Analysis of Incorrect Options:** * **Keratic precipitates (KPs):** These are inflammatory cell deposits on the corneal endothelium. They appear after the initial protein leak and cellular migration, making them a subsequent sign rather than the earliest. * **Constriction of pupil (Miosis):** This occurs due to iris sphincter spasm caused by prostaglandins and ciliary body irritation. While a common early feature, it follows the biochemical changes in the aqueous. * **Raised intraocular pressure (IOP):** In acute anterior uveitis, IOP is typically **low** (due to ciliary body exhaustion). Raised IOP is a complication (secondary glaucoma) seen later in the disease course or in specific types like Posner-Schlossman syndrome. **High-Yield Clinical Pearls for NEET-PG:** * **Aqueous Cells:** The most reliable indicator of **active** inflammation and the primary guide for titrating steroid therapy. * **Hypopyon:** A collection of pus/cells in the anterior chamber; seen in HLA-B27 associated uveitis or Behcet’s disease. * **Festooned Pupil:** An irregular pupil caused by posterior synechiae (adhesions between the iris and lens). * **Mydriatics (Atropine):** Used in treatment to prevent synechiae and relieve pain from ciliary spasm.

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