Diseases of the Lens Practice Questions

Q: The Fincham test is used to diagnose which of the following conditions?

Cataract. **Explanation:** The **Fincham Test** (also known as the Fincham’s Stenopeic Slit Test) is a clinical method used to differentiate between halos caused by **corneal edema** (as seen in Acute Angle Closure Glaucoma) and those caused by **immature cataract**. 1. **Why Cataract is correct:** In an immature cataract, the opacities in the crystalline lens act as a diffraction grating. When a stenopeic slit is passed across the pupil, the halos **break up into segments** or rotate. This positive Fincham test confirms the halos are lenticular (cataractous) in origin. 2. **Why Acute Angle Closure Glaucoma (AACG) is incorrect:** In AACG, halos are caused by corneal edema (fluid in the epithelium). When the stenopeic slit is moved across the pupil, these halos **remain intact** and do not break up. 3. **Why Open Angle Glaucoma & Mucopurulent Conjunctivitis are incorrect:** These conditions do not typically present with the specific "halo" phenomenon that requires differentiation via Fincham’s test. Mucopurulent conjunctivitis may cause blurred vision due to discharge, but this clears with blinking. **Clinical Pearls for NEET-PG:** * **Mechanism:** Halos in cataract are due to diffraction by lens fibers; in glaucoma, they are due to diffraction by edematous corneal epithelial cells. * **Emsley’s Rule:** Another name for the principle that glaucomatous halos are circular and intact, while cataractous halos are fragmented. * **Differential Diagnosis of Halos:** Always consider AACG, Cataract, and sometimes contact lens overwear (Sattler’s veil).

Q: Oil drop cataract is characteristically seen in which of the following conditions?

Galactosemia. **Explanation:** **Oil drop cataract** is the pathognomonic ocular finding in **Galactosemia**, specifically due to Galactose-1-phosphate uridyltransferase (GALT) deficiency. **Mechanism:** In galactosemia, the excess galactose in the lens is converted into **Dulcitol (Sorbitol)** by the enzyme **Aldose Reductase**. Dulcitol is osmotically active and cannot exit the lens, leading to an influx of water. This causes swelling of the lens fibers and an alteration in the refractive index, creating the characteristic "oil drop" appearance on retroillumination. If detected early, this stage is reversible with a lactose-free diet. **Analysis of Incorrect Options:** * **A. Diabetes:** Characterized by **Snowflake cataracts** (subcapsular opacities) due to sorbitol accumulation. It can also lead to early onset of senile cataracts. * **B. Chalcosis:** Caused by intraocular copper (e.g., a copper-containing foreign body). It results in a **Sunflower cataract** (petals-like opacities in the anterior capsule). * **C. Wilson’s Disease:** While it involves copper metabolism, the classic ocular finding is the **Kayser-Fleischer (KF) ring** in the Descemet’s membrane. It can also present with a Sunflower cataract, but not an oil drop cataract. **High-Yield Clinical Pearls for NEET-PG:** * **Galactokinase deficiency:** Presents only with cataracts (no systemic involvement). * **Christmas tree cataract:** Seen in Myotonic Dystrophy. * **Rosette-shaped cataract:** Seen in Blunt Trauma. * **Shield cataract:** Seen in Atopic Dermatitis. * **Polychromatic luster:** Earliest sign of Complicated Cataract.

Q: A young patient presents with gradual blurring of vision in the left eye. Slit lamp examination reveals fine stellate keratatic precipitates and aqueous flare and a typical complicated posterior subcapsular cataract. No posterior synechiae were observed. What is the most likely diagnosis?

Heterochromic iridocyclitis of Fuch's. **Explanation:** The clinical presentation points directly to **Fuchs’ Heterochromic Iridocyclitis (FHI)**. The hallmark of FHI is a chronic, low-grade, non-granulomatous uveitis characterized by a classic triad: **fine stellate keratatic precipitates (KPs)** distributed over the entire corneal endothelium, **aqueous flare/cells**, and the development of a **complicated posterior subcapsular cataract**. A defining negative finding in FHI is the **absence of posterior synechiae**, despite the presence of chronic inflammation. This distinguishes it from most other forms of anterior uveitis. While heterochromia (iris color change) is a key sign, it may be subtle or absent in early stages or in dark-eyed individuals. **Why other options are incorrect:** * **Intermediate Uveitis (Pars planitis):** Characterized by "snowbanking" or "snowballs" in the vitreous and peripheral retina. While it causes complicated cataracts, it does not typically present with diffuse stellate KPs. * **Heerfordt’s Disease:** A specific manifestation of Sarcoidosis (Uveoparotid fever) presenting with granulomatous uveitis (large mutton-fat KPs), parotid swelling, and facial nerve palsy. Posterior synechiae are common here. * **Subacute Iridocyclitis:** Usually presents with circumcorneal congestion, pain, and a high tendency to form posterior synechiae. **NEET-PG High-Yield Pearls:** * **Amsler’s Sign:** Filiform hemorrhage triggered by paracentesis or minor trauma (due to fragile iris vessels) is a classic diagnostic feature of FHI. * **Treatment:** Steroids are generally **not** effective or indicated for FHI; management focuses on treating the secondary cataract and glaucoma. * **Triad of FHI:** Heterochromia, Cyclitis (KPs), and Cataract.

Q: An infant presents with bilateral white pupillary reflex. On slit lamp examination, a zone of opacity is observed around the fetal nucleus with spoke-like radial opacities. What is the most likely diagnosis?

Lamellar cataract. **Explanation:** The clinical presentation describes a **Lamellar (Zonular) cataract**, which is the most common type of congenital cataract causing visual impairment. **1. Why Lamellar Cataract is Correct:** The hallmark of a lamellar cataract is a specific **zone of opacity** involving a particular layer (lamella) of the lens, usually surrounding the **fetal nucleus**. The rest of the lens (the core and the outer cortex) remains clear. The pathognomonic feature mentioned—**spoke-like radial opacities**—are known as **"Riders."** These are linear opacities that extend from the equator of the zone of opacity into the clear cortex. **2. Why the Other Options are Incorrect:** * **Cataracta Centralis Pulverulenta (Coppock Cataract):** This presents as a small, circular, powdery (dust-like) opacity strictly confined to the embryonic nucleus. It does not feature "riders." * **Coronary Cataract:** These are developmental cataracts occurring at puberty. They appear as crown-shaped opacities in the peripheral cortex (hidden by the iris) and are not typically seen in infants. * **Posterior Polar Cataract:** This is a stationary, circular opacity at the posterior pole of the lens, often associated with a persistent hyaloid artery remnant (Mittendorf dot). It does not involve the fetal nucleus or show radial spokes. **Clinical Pearls for NEET-PG:** * **Etiology:** Lamellar cataracts are often associated with **maternal Vitamin D deficiency** or **infantile hypocalcemia** during the period of lens development. * **Visual Impact:** They are usually bilateral and often require surgery because the opacity is large enough to obstruct the visual axis. * **High-Yield Tip:** Whenever you see the word **"Riders"** or **"Spokes"** in the context of a pediatric lens opacity, think **Lamellar Cataract**.

Q: What is the most common complication of a hypermature sclerotic cataract?

Dislocation of the lens. **Explanation:** A **hypermature sclerotic cataract** (also known as a shrunken cataract) occurs when the lens cortex becomes completely inspissated and the lens shrivels due to the leakage of water. This process leads to a significant reduction in lens volume, causing the lens capsule to become wrinkled and thickened. The correct answer is **Dislocation of the lens (A)** because, in the sclerotic stage, the chronic degenerative process leads to the **degeneration and fragility of the zonules of Zinn**. As the zonules weaken and snap, the lens becomes unstable, leading to subluxation or complete dislocation (usually into the vitreous or anterior chamber). **Analysis of Incorrect Options:** * **B. Phacomorphic glaucoma:** This is a complication of an **intumescent (immature) cataract**, where the lens swells and pushes the iris forward, closing the angle. In sclerotic cataracts, the lens is shrunken, not swollen. * **C. Uveitis:** While a hypermature *morgagnian* cataract can cause phacolytic uveitis (due to leaking lens proteins), it is less characteristic of the shrunken sclerotic type compared to the mechanical failure of the zonules. * **D. Neovascularization of the retina:** This is typically a complication of ischemic retinal diseases (like Diabetes or CRVO) and is not directly caused by the lens aging process. **NEET-PG High-Yield Pearls:** * **Hypermature Morgagnian Cataract:** Characterized by a liquefied cortex where the brownish nucleus settles at the bottom ("sunset sign"). It is most commonly associated with **Phacolytic Glaucoma**. * **Hypermature Sclerotic Cataract:** Characterized by a shrunken, wrinkled appearance. It is most commonly associated with **Zonular Degeneration/Dislocation**. * **Phacoantigenic Uveitis:** Occurs when the lens capsule is breached (trauma/surgery), leading to a Type IV hypersensitivity reaction to lens proteins.

Question 1

The Fincham test is used to diagnose which of the following conditions?

Accepted Answer

Cataract

Answer

Open angle glaucoma

Answer

Mucopurulent conjunctivitis

Answer

Acute angle closure glaucoma

Question 2

Oil drop cataract is characteristically seen in which of the following conditions?

Accepted Answer

Galactosemia

Answer

Diabetes

Answer

Chalcosis

Answer

Wilson's disease

Question 3

A young patient presents with gradual blurring of vision in the left eye. Slit lamp examination reveals fine stellate keratatic precipitates and aqueous flare and a typical complicated posterior subcapsular cataract. No posterior synechiae were observed. What is the most likely diagnosis?

Accepted Answer

Heterochromic iridocyclitis of Fuch's

Answer

Intermediate Uveitis (Pars planitis)

Answer

Heerfordt's disease

Answer

Subacute Iridocyclitis

Question 4

An infant presents with bilateral white pupillary reflex. On slit lamp examination, a zone of opacity is observed around the fetal nucleus with spoke-like radial opacities. What is the most likely diagnosis?

Accepted Answer

Lamellar cataract

Answer

Cataracta Centralis Pulverulenta

Answer

Coronary cataract

Answer

Posterior polar cataract

Question 5

What is the most common complication of a hypermature sclerotic cataract?

Accepted Answer

Dislocation of the lens

Answer

Phacomorphic glaucoma

Answer

Uveitis

Answer

Neovascularization of the retina

Diseases of the Lens — MCQs

Diseases of the Lens — MCQs

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