Ocular Manifestations of Systemic Disorders Practice Questions

Q: What is one of the most common complications of iridocyclitis?

Secondary glaucoma. **Explanation:** **Iridocyclitis** (anterior uveitis) is characterized by inflammation of the iris and ciliary body. **Secondary glaucoma** is one of the most common and vision-threatening complications of this condition. It occurs via two primary mechanisms: 1. **Open-angle mechanism:** Inflammatory debris (cells, fibrin, and pigment) clogs the trabecular meshwork, or "trabeculitis" reduces outflow facility. 2. **Closed-angle mechanism:** Formation of **posterior synechiae** (adhesions between the iris and lens) leads to *seclusio pupillae*. This obstructs aqueous flow from the posterior to the anterior chamber, causing **iris bombé** and subsequent angle closure. **Analysis of Incorrect Options:** * **Scleritis (A):** This is an inflammation of the outer coat of the eye. While systemic diseases (like Rheumatoid Arthritis) can cause both uveitis and scleritis, one does not typically occur as a *complication* of the other. * **Band-shaped Keratopathy (C):** This is a classic complication of **chronic** uveitis (especially in Juvenile Idiopathic Arthritis) due to calcium deposition in Bowman’s layer. While common in chronic cases, secondary glaucoma occurs more frequently across both acute and chronic presentations. * **Corneal Ulcer (D):** This is typically caused by infection or trauma. Iridocyclitis may cause corneal edema or keratic precipitates (KPs), but it does not directly cause ulceration. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of death in Uveitis:** Not applicable, but the most common cause of **blindness** in uveitis is **Cystoid Macular Edema (CME)**. * **Festooned Pupil:** Irregular pupil shape caused by patchy posterior synechiae; a hallmark of previous iridocyclitis. * **Treatment Note:** Atropine is used in iridocyclitis to provide ciliary rest and prevent the formation of posterior synechiae.

Q: Sudden painful diminition of vision in Anterior Uveitis is due to?

Ciliary muscle spasm. **Explanation:** In **Anterior Uveitis** (Iridocyclitis), the inflammation of the iris and ciliary body leads to a classic triad of symptoms: pain, photophobia, and blurred vision. **1. Why Ciliary Muscle Spasm is correct:** The hallmark of pain and sudden visual disturbance in acute anterior uveitis is the **spasm of the ciliary muscle and the iris sphincter**. The inflammation irritates these smooth muscles, causing them to contract uncontrollably. This spasm results in: * **Pain:** A deep, throbbing ache (ciliary neuralgia). * **Diminution of vision:** The spasm induces "accommodative spasm," shifting the refractive state toward myopia (pseudomyopia), which causes blurring of distance vision. **2. Analysis of Incorrect Options:** * **A. Blood in Anterior chamber (Hyphema):** While blood can cause sudden vision loss, it is not a standard feature of primary anterior uveitis unless it is traumatic or associated with specific syndromes like Fuchs' Heterochromic Iridocyclitis (Amsler sign). * **B. Cells in Anterior chamber:** While "cells and flare" are the diagnostic signs of uveitis, they typically cause a gradual "mistiness" or "haze" rather than sudden painful diminution. * **C. Edema of Cornea:** This occurs in late stages or if there is secondary glaucoma (due to high IOP). While it causes blurred vision, it is a secondary complication rather than the primary cause of the initial painful spasm. **Clinical Pearls for NEET-PG:** * **Treatment Gold Standard:** Cycloplegics (e.g., **Atropine or Homatropine**) are used specifically to paralyze the ciliary muscle, thereby relieving the spasm and the associated pain. * **Miosis:** The iris sphincter spasm leads to a small, sluggishly reacting pupil, which helps differentiate uveitis from Acute Congestive Glaucoma (where the pupil is mid-dilated). * **Ciliary Flush:** The characteristic redness in uveitis is due to the engorgement of anterior ciliary vessels.

Q: What is the most common causative organism of canaliculitis?

Actinomyces israelii. **Explanation:** **Canaliculitis** is a chronic inflammatory condition of the lacrimal canaliculi. The correct answer is **Actinomyces israelii**, which is historically and clinically recognized as the most common causative agent. 1. **Why Actinomyces israelii is correct:** * *Actinomyces israelii* is a Gram-positive, anaerobic, branching filamentous bacterium (often misclassified as a fungus in older texts). * It leads to the formation of characteristic **"sulfur granules"** or dacryoliths (concretions) within the canaliculus. These concretions cause mechanical obstruction and chronic discharge. 2. **Analysis of Incorrect Options:** * **Herpes simplex virus (HSV):** While HSV can cause viral canaliculitis (often leading to secondary canalicular stenosis), it is much less common than bacterial causes. * **Candida albicans:** Fungal canaliculitis is rare and typically occurs in immunocompromised patients or following prolonged topical steroid/antibiotic use. * **Nocardia asteroides:** Although Nocardia is a filamentous bacterium similar to Actinomyces, it is a much rarer cause of this specific ocular infection. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Presentation:** A "pouty" punctum (erythematous and dilated), chronic epiphora, and unilateral conjunctivitis localized to the nasal side. * **Diagnostic Sign:** Expression of yellow, "cheesy" material or **sulfur granules** upon massaging the canaliculus. * **Management:** The definitive treatment is **canaliculotomy** with curettage of the concretions, as topical antibiotics cannot penetrate the dacryoliths. * **Differential Diagnosis:** Often misdiagnosed as chronic conjunctivitis or dacryocystitis; however, in canaliculitis, the lacrimal sac is usually not involved, and the "regurgitation test" is negative.

Q: Oral contraceptive pills are associated with which of the following ocular complications?

Optic neuritis. **Explanation:** Oral contraceptive pills (OCPs) are known to have various systemic and ocular side effects, primarily due to their estrogen and progesterone components. **Why Optic Neuritis is the Correct Answer:** OCPs are associated with an increased risk of **thromboembolic phenomena** and inflammatory changes. While the exact pathophysiology is debated, OCP use has been linked to **Optic Neuritis** (inflammation of the optic nerve) and retinal vascular occlusions (both arterial and venous). The hormonal influence on vascular permeability and the hypercoagulable state induced by estrogen are thought to contribute to these inflammatory and ischemic insults to the optic nerve. **Analysis of Incorrect Options:** * **A. Papilledema:** While OCPs are a known risk factor for **Idiopathic Intracranial Hypertension (Pseudotumor Cerebri)**, which presents with bilateral optic disc swelling (papilledema), "Optic Neuritis" is the more classically cited direct inflammatory complication in standard ophthalmology textbooks for this specific question type. * **C. Color Blindness:** This is typically a congenital condition (X-linked recessive) or can be an acquired side effect of drugs like Ethambutol or Chloroquine, but it is not a primary complication of OCPs. * **D. Papillitis:** This is a form of optic neuritis where the optic disc is involved. However, "Optic Neuritis" is the broader, more standard clinical term used in the context of OCP-induced neuro-ophthalmic complications. **High-Yield Clinical Pearls for NEET-PG:** * **OCP Ocular Side Effects:** Dry eye syndrome (most common), contact lens intolerance (due to corneal edema/curvature changes), retinal vein occlusion, and pseudotumor cerebri. * **Drug of Choice for Optic Neuritis:** IV Methylprednisolone (ONTT trial protocol). * **Other Drugs causing Optic Neuritis:** Ethambutol, Isoniazid, Chloramphenicol, and Digitalis.

Question 1

What is one of the most common complications of iridocyclitis?

Accepted Answer

Secondary glaucoma

Answer

Scleritis

Answer

Band-shaped keratopathy

Answer

Corneal ulcer

Question 2

Sudden painful diminition of vision in Anterior Uveitis is due to?

Accepted Answer

Ciliary muscle spasm

Answer

Blood in Anterior chamber

Answer

Cells in Anterior chamber

Answer

Edema of Cornea

Question 3

What is the most common causative organism of canaliculitis?

Accepted Answer

Actinomyces israelii

Answer

Herpes simplex virus (HSV)

Answer

Candida albicans

Answer

Nocardia asteroides

Question 4

Which of the following can cause uveitis?

Accepted Answer

Staphylococcus

Answer

Tuberculosis

Answer

Streptococcus

Answer

Klebsiella

Question 5

Oral contraceptive pills are associated with which of the following ocular complications?

Accepted Answer

Optic neuritis

Answer

Papilledema

Answer

Color blindness

Answer

Papillitis

Ocular Manifestations of Systemic Disorders — MCQs

Ocular Manifestations of Systemic Disorders — MCQs

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