Ocular Manifestations of Systemic Disorders — MCQs

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

Question 21: What is a common ocular manifestation in Trisomy 13?

A. Capillary hemangioma
B. Bilateral microphthalmos (Correct Answer)
C. Neurofibroma
D. Dermoid Cyst

Explanation: **Explanation:** **Trisomy 13 (Patau Syndrome)** is a severe chromosomal disorder characterized by a failure of normal forebrain and midline facial development. The hallmark ocular finding in Trisomy 13 is **bilateral microphthalmos**, which often occurs as part of a spectrum of severe malformations, including **uveal colobomas** and **persistent hyperplastic primary vitreous (PHPV)**. In extreme cases, it can present as anophthalmos or cyclopia. A high-yield histopathological feature specific to Trisomy 13 is the presence of **intraocular cartilage** within a ciliary body coloboma. **Analysis of Incorrect Options:** * **A. Capillary Hemangioma:** This is the most common benign orbital tumor of childhood, typically associated with **PHACE syndrome**, not Trisomy 13. * **C. Neurofibroma:** These are characteristic of **Neurofibromatosis Type 1 (NF1)**. Plexiform neurofibromas give the classic "bag of worms" sensation and S-shaped eyelid deformity. * **D. Dermoid Cyst:** These are choristomas commonly found at the superotemporal orbital rim. While epibulbar dermoids are associated with **Goldenhar syndrome**, they are not a feature of Trisomy 13. **NEET-PG High-Yield Pearls:** * **Trisomy 13 (Patau):** Microphthalmos, Coloboma, Intraocular cartilage, Cataract. * **Trisomy 18 (Edwards):** Ptosis, Corneal opacities, Congenital glaucoma. * **Trisomy 21 (Down):** Upslanting palpebral fissures, Epicanthal folds, **Brushfield spots** (iris hyperplasia), Keratoconus, and high risk of early-onset cataracts. * **Cat-eye Syndrome:** Associated with Coloboma and Chromosome 22 partial trisomy.

Question 22: Behcet's syndrome is characterized by all of the following eye manifestations, EXCEPT:

A. Posterior uveitis
B. Iritis
C. Optic Neuritis
D. Retinal pigmentation (Correct Answer)

Explanation: **Explanation:** Behcet’s syndrome is a chronic, multisystemic, idiopathic inflammatory disorder characterized by a triad of **recurrent oral ulcers, genital ulcers, and uveitis**. It is fundamentally a **systemic occlusive vasculitis**. **Why Retinal Pigmentation is the Correct Answer:** Retinal pigmentation is **not** a characteristic feature of Behcet’s disease. While the disease causes severe retinal damage, it typically manifests as **necrotizing vasculitis**, retinal hemorrhages, and exudates. Unlike conditions like Retinitis Pigmentosa or certain chronic infections (e.g., Syphilis), Behcet’s does not typically present with primary pigmentary changes or "bone-spicule" formations. **Analysis of Other Options:** * **Posterior Uveitis:** This is a hallmark of the disease. It often presents as a **vasculitis (periphlebitis)** involving both arteries and veins, leading to retinal ischemia and potential vitreous hemorrhage. * **Iritis:** Behcet’s frequently causes acute anterior uveitis. A high-yield feature is the presence of a **"cold" or "shifting" hypopyon** (a sterile collection of inflammatory cells in the anterior chamber that moves with head position). * **Optic Neuritis:** Involvement of the optic nerve can occur due to direct inflammation or as a secondary result of retinal vasculitis and ischemia, leading to optic atrophy in late stages. **High-Yield Clinical Pearls for NEET-PG:** * **HLA Association:** Strongly associated with **HLA-B51**. * **Pathergy Test:** A unique diagnostic skin hyper-reactivity test where a sterile needle prick results in a papule or pustule within 24–48 hours. * **Ocular Prognosis:** Behcet’s is one of the most common causes of **blindness** among the uveitides due to its recurrent nature and severe occlusive vasculitis. * **Treatment:** Systemic corticosteroids and immunosuppressants (like Azathioprine or Cyclosporine) are mainstay therapies.

Question 23: Complications of acute anterior uveitis are all EXCEPT?

A. Secondary glaucoma
B. Cataract
C. Retinal detachment (Correct Answer)
D. Macular oedema

Explanation: **Explanation:** Acute anterior uveitis (AAU) primarily involves inflammation of the iris and ciliary body. Complications arise due to the proximity of these structures to the lens and the disruption of aqueous humor dynamics. **Why Retinal Detachment (RD) is the correct answer:** Retinal detachment is **not** a typical complication of acute anterior uveitis. RD is more commonly associated with **posterior uveitis** (exudative RD) or conditions involving the vitreous and peripheral retina (rhegmatogenous RD). While severe chronic inflammation can lead to tractional RD, it is not a feature of the acute anterior presentation. **Analysis of incorrect options:** * **Secondary Glaucoma:** This is a common complication. It occurs due to "clogging" of the trabecular meshwork by inflammatory cells (open-angle) or the formation of **posterior synechiae** leading to iris bombé and angle closure (closed-angle). * **Cataract:** Known as **Cataracta Complicata**, it typically starts as a polychromatic luster at the posterior pole of the lens. It results from altered lens metabolism and the long-term use of topical steroids. * **Macular Oedema:** Specifically **Cystoid Macular Oedema (CMO)**, this occurs due to the release of inflammatory mediators (prostaglandins) that travel posteriorly through the vitreous, increasing the permeability of perifoveal capillaries. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of AAU:** Idiopathic; however, **HLA-B27** positivity is the most common systemic association (e.g., Ankylosing Spondylitis). * **Festooned Pupil:** An irregular pupil shape caused by patchy posterior synechiae. * **Busacca Nodules:** Located on the iris surface (characteristic of granulomatous uveitis). * **Koeppe Nodules:** Located at the pupillary margin (seen in both granulomatous and non-granulomatous uveitis).

Question 24: Which of the following can be an ophthalmic complication of Diabetes Mellitus, except?

A. Papillopathy
B. Snowflake cataract
C. Retinopathy
D. Rhegmatogenous retinal detachment (Correct Answer)

Explanation: **Explanation:** Diabetes Mellitus (DM) primarily affects the ocular microvasculature, leading to ischemic and proliferative changes. **Why Option D is the Correct Answer:** **Rhegmatogenous Retinal Detachment (RRD)** is caused by a **full-thickness retinal break** (hole or tear) that allows fluid to enter the subretinal space. It is typically associated with high myopia, trauma, or lattice degeneration, but **not directly caused by diabetes**. In contrast, advanced Proliferative Diabetic Retinopathy (PDR) leads to **Tractional Retinal Detachment (TRD)**. This occurs when fibrovascular membranes contract and pull the neurosensory retina away from the RPE. If a tractional pull creates a tear, it is termed a *Combined* Tractional-Rhegmatogenous RD, but pure RRD is not a classic diabetic complication. **Analysis of Incorrect Options:** * **A. Papillopathy:** Diabetic Papillopathy is a form of optic disc swelling caused by microvascular leakage. It is often transient and can occur in both Type 1 and Type 2 diabetics. * **B. Snowflake Cataract:** This is the **pathognomonic** cataract of uncontrolled Type 1 DM. It consists of subcapsular milky-white opacities. (Note: Senile cataracts also occur earlier and more frequently in diabetics). * **C. Retinopathy:** Diabetic Retinopathy (NPDR/PDR) is the most common and significant ocular complication of DM, characterized by microaneurysms, hemorrhages, and neovascularization. **Clinical Pearls for NEET-PG:** * **Most common cause of blindness in DM:** Diabetic Macular Edema (DME). * **Earliest clinical sign of NPDR:** Microaneurysms (seen in the inner nuclear layer). * **First change in DM:** Thickening of the capillary basement membrane and loss of pericytes. * **Neovascularization (NVD/NVE):** Defines the transition from NPDR to PDR.

Question 25: Neovascularization of the iris is not seen in which of the following conditions?

A. Central Retinal Vein Occlusion (CRVO)
B. Pigment Dispersion Syndrome (Correct Answer)
C. Ocular Ischemic Syndrome
D. Diabetic Retinopathy

Explanation: **Explanation:** **Neovascularization of the Iris (Rubeosis Iridis)** is a pathological process where new, fragile blood vessels form on the surface of the iris. This occurs primarily due to **retinal ischemia**, which triggers the release of Vascular Endothelial Growth Factor (VEGF). VEGF diffuses anteriorly, stimulating angiogenesis in the iris and the iridocorneal angle. * **Why Pigment Dispersion Syndrome (PDS) is the correct answer:** PDS is a mechanical condition where pigment is rubbed off the posterior iris surface due to contact with lens zonules. While it can lead to Pigmentary Glaucoma, it is **not an ischemic condition**. Therefore, there is no stimulus for VEGF production or neovascularization. **Analysis of Incorrect Options:** * **CRVO (Central Retinal Vein Occlusion):** Specifically the "Ischemic" type, it is a classic cause of rubeosis iridis, often leading to "100-day glaucoma" (Neovascular Glaucoma). * **Ocular Ischemic Syndrome:** Caused by chronic hypoperfusion (usually due to carotid artery stenosis), it leads to global ocular ischemia and is a potent trigger for iris neovascularization. * **Diabetic Retinopathy:** Proliferative Diabetic Retinopathy (PDR) is the most common cause of rubeosis iridis worldwide due to widespread retinal capillary non-perfusion. **Clinical Pearls for NEET-PG:** * **The "Rule of 90":** In ischemic CRVO, neovascular glaucoma typically develops within 90 days (3 months). * **Commonest cause of Rubeosis Iridis:** Diabetic Retinopathy. * **Commonest cause of unilateral Rubeosis Iridis:** Ischemic CRVO. * **Clinical Sign:** New vessels usually appear first at the **pupillary margin** before spreading to the angle.

Question 26: Soft exudates are found in which of the following conditions?

A. Diabetes Mellitus
B. Hypertension
C. Toxemia
D. All of the above (Correct Answer)

Explanation: **Explanation:** **Soft exudates**, also known as **Cotton Wool Spots (CWS)**, are not true exudates. They represent micro-infarctions of the nerve fiber layer (NFL) of the retina. When retinal arterioles are occluded, axoplasmic flow within the nerves is interrupted, leading to the accumulation of organelles and debris (Cajal bodies), which appear as fluffy, white, cloud-like lesions with ill-defined margins. The underlying pathophysiology is **focal retinal ischemia**. Therefore, any systemic condition that causes microvascular damage or occlusion can lead to their formation: * **Diabetes Mellitus:** CWS are a hallmark of Pre-proliferative Diabetic Retinopathy (PPDR), signifying worsening retinal ischemia. * **Hypertension:** They are a characteristic feature of Grade III Hypertensive Retinopathy (Keith-Wagener-Barker classification). * **Toxemia (Preeclampsia/Eclampsia):** Severe vasospasm in pregnancy-induced hypertension leads to acute retinal ischemia and the appearance of soft exudates. **Why "All of the above" is correct:** Since all three conditions involve microvascular compromise (either through basement membrane thickening, vasospasm, or arteriolar narrowing), they all manifest with soft exudates. **Clinical Pearls for NEET-PG:** * **Hard Exudates vs. Soft Exudates:** Hard exudates are lipid deposits (seen in the Outer Plexiform Layer) due to chronic leakage; Soft exudates are infarcts (seen in the Nerve Fiber Layer) due to acute ischemia. * **Differential Diagnosis of CWS:** Apart from the options above, consider HIV retinopathy (most common finding), SLE, and Severe Anemia. * **Roth Spots:** These are CWS surrounded by a hemorrhage, classically seen in Subacute Bacterial Endocarditis (SABE) and Leukemia.

Question 27: What is the most common complication in recurrent anterior uveitis?

A. Staphyloma
B. Glaucoma (Correct Answer)
C. Cataract
D. Vitreous hemorrhage

Explanation: **Explanation:** In recurrent anterior uveitis, the most common complication is **Glaucoma (Secondary Glaucoma)**. This occurs due to multiple mechanisms: 1. **Inflammatory debris:** Fibrin and inflammatory cells clog the trabecular meshwork (obstructive). 2. **Trabeculitis:** Direct inflammation of the trabecular meshwork. 3. **Structural changes:** Formation of **Posterior Synechiae** (adhesion of iris to lens) leading to *seclusio pupillae*, which causes **Iris Bombe** and subsequent **Peripheral Anterior Synechiae (PAS)**, permanently closing the angle. 4. **Steroid-induced:** Long-term use of topical corticosteroids to manage recurrences often leads to increased intraocular pressure. **Analysis of Incorrect Options:** * **Cataract:** While very common (specifically **Complicated Cataract/Posterior Subcapsular Cataract**), it typically ranks second to glaucoma in frequency or is a result of chronic, rather than just recurrent, inflammation and steroid use. * **Staphyloma:** This refers to the thinning and bulging of the uveal tissue through the sclera. It is a complication of high myopia or scleritis, not typically anterior uveitis. * **Vitreous Hemorrhage:** This is more commonly associated with posterior segment pathologies like proliferative diabetic retinopathy or Eales' disease, rather than anterior uveitis. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of blindness in Uveitis:** Cystoid Macular Edema (CME). * **Mydriatic of choice:** Atropine (to prevent posterior synechiae and provide pain relief by paralyzing the ciliary muscle). * **Busacca Nodules:** Located on the iris stroma (Granulomatous uveitis). * **Koeppe Nodules:** Located at the pupillary margin (Granulomatous uveitis).

Question 28: Which nerve is involved in exposure keratopathy?

A. Third cranial nerve
B. Fifth cranial nerve
C. Seventh cranial nerve (Correct Answer)
D. Ninth cranial nerve

Explanation: **Explanation:** **Exposure Keratopathy** occurs when the cornea dries out due to incomplete eyelid closure (lagophthalmos). **Why Option C is Correct:** The **Seventh Cranial Nerve (Facial Nerve)** provides motor innervation to the **Orbicularis Oculi** muscle. This muscle is responsible for closing the eyelids. In Facial Nerve Palsy (e.g., Bell’s Palsy), the inability to close the eye leads to constant exposure of the corneal surface, evaporation of the tear film, and subsequent corneal desiccation, ulceration, and scarring. **Why Other Options are Incorrect:** * **Option A (Third Nerve):** The Oculomotor nerve supplies the *Levator Palpebrae Superioris*, which **opens** the eyelid. Damage results in Ptosis (drooping), which actually protects the cornea from exposure. * **Option B (Fifth Nerve):** The Trigeminal nerve (Ophthalmic division) provides **sensory** innervation to the cornea. Damage leads to **Neurotrophic Keratopathy** (loss of trophic factors and blink reflex), not exposure keratopathy. * **Option D (Ninth Nerve):** The Glossopharyngeal nerve is involved in taste and pharyngeal sensations; it has no role in eyelid mechanics or corneal health. **High-Yield Clinical Pearls for NEET-PG:** * **Bell’s Phenomenon:** A protective mechanism where the eyeball rolls upwards and outwards during attempted closure. If this is absent, the risk of exposure keratopathy in 7th nerve palsy increases significantly. * **Management:** Frequent lubricants, taping the lids at night, or **Tarsorrhaphy** (suturing the lids together) in severe cases. * **Differential:** Remember: **7th Nerve** = Exposure Keratopathy; **5th Nerve** = Neurotrophic Keratopathy.

Question 29: Schirmer's test is done to assess the function of which of the following cranial nerves?

A. Oculomotor nerve
B. Optic nerve
C. Facial nerve (Correct Answer)
D. None of the above

Explanation: **Explanation:** The **Schirmer’s test** is used to measure tear production and assess for aqueous tear deficiency (e.g., in Sjögren’s syndrome). The correct answer is the **Facial nerve (CN VII)** because it carries the **parasympathetic secretomotor fibers** responsible for lacrimation. **Why Facial Nerve is Correct:** The pathway for lacrimation begins in the lacrimatory nucleus (pons). The fibers travel via the **nervus intermedius**, then the **greater petrosal nerve** (a branch of CN VII), and eventually synapse at the pterygopalatine ganglion. Postganglionic fibers then reach the lacrimal gland via the zygomatic and lacrimal nerves. Therefore, a lesion of the facial nerve proximal to the geniculate ganglion results in a dry eye, which can be detected by a Schirmer’s test. **Why Other Options are Incorrect:** * **Optic nerve (CN II):** This is a purely sensory nerve responsible for vision and the afferent limb of the pupillary light reflex; it has no role in tear production. * **Oculomotor nerve (CN III):** This nerve controls most extraocular muscles, levator palpebrae superioris, and provides parasympathetic supply to the ciliary muscle and sphincter pupillae (for accommodation and miosis), but not the lacrimal gland. **Clinical Pearls for NEET-PG:** * **Schirmer’s I:** Measures total secretion (reflex + basal). Normal is >15 mm in 5 minutes. <5 mm is diagnostic of dry eye. * **Schirmer’s II:** Measures basal secretion only (performed after applying topical anesthesia to eliminate reflex tearing). * **Topographic Diagnosis:** In cases of Bell’s Palsy, a reduced Schirmer’s test indicates the lesion is at or proximal to the **geniculate ganglion**.

Question 30: A patient presents with itching. What is the most likely diagnosis?

A. Trichiasis
B. Blepharitis (Correct Answer)
C. Ectropion
D. Atopic dermatitis

Explanation: ***Blepharitis*** - **Eyelid margin inflammation** with **crusting**, **erythema**, and **scaling at lash bases** commonly presents with significant itching and irritation. - Often associated with **Staphylococcal** or **seborrheic** causes, leading to chronic inflammatory changes of the eyelid margins. *Trichiasis* - Characterized by **inward turning of eyelashes** that rub against the cornea and conjunctiva. - Primarily causes **foreign body sensation** and **corneal irritation** rather than generalized itching. *Ectropion* - Involves **outward turning of the eyelid margin** away from the globe, exposing the conjunctiva. - Typically presents with **tearing** and **exposure symptoms** rather than itching as the primary complaint. *Atopic dermatitis* - Systemic condition affecting **multiple body areas** with characteristic **eczematous changes** and **dry skin**. - Would show **periorbital involvement** with **lichenification** and **xerosis**, not localized eyelid margin inflammation.

Practice by Chapter

Diabetes Mellitus

Practice Questions

Hypertension

Practice Questions

Autoimmune Disorders

Practice Questions

Thyroid Disease

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HIV and AIDS

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Hematological Disorders

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Neurological Disorders

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Dermatological Conditions

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Pregnancy-Related Eye Changes

Practice Questions

Metabolic Disorders

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Ocular Toxicity of Systemic Medications

Practice Questions

Infectious Systemic Diseases

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