Diseases of the Lens Practice Questions

Q: Ocular examination of a man with a systemic disease shows 'sunflower cataract'. This is typically due to:

Chalcosis. **Explanation:** The **Sunflower Cataract** (Chalcosis lentis) is a pathognomonic finding of **Chalcosis**, which refers to the intraocular deposition of copper. This occurs due to an intraocular copper-containing foreign body or systemic copper metabolism disorders, most notably **Wilson’s Disease** (Hepatolenticular degeneration). The "sunflower" appearance results from copper deposition in the **anterior lens capsule** and subcapsular epithelium. It typically manifests as a central disc with radiating petal-like spokes. Unlike senile cataracts, it usually does not significantly impair vision and may resolve if the copper source is removed or systemic levels are chelated. **Analysis of Incorrect Options:** * **A. Diabetes Mellitus:** Characterized by "Snowflake cataracts" (bilateral, subcapsular milky white spots) due to sorbitol accumulation and osmotic swelling. * **B. Systemic Lupus Erythematosus (SLE):** Primarily causes posterior segment changes like retinal vasculitis or cotton wool spots; it does not cause sunflower cataracts. * **D. Sarcoidosis:** Typically presents with granulomatous uveitis (Mutton-fat KPs) and "string of pearls" vitreous opacities. **High-Yield Clinical Pearls for NEET-PG:** * **Wilson’s Disease Triad:** Sunflower cataract, **Kayser-Fleischer (KF) ring** (copper in Descemet’s membrane), and low serum ceruloplasmin. * **Chalcosis vs. Siderosis:** Copper causes Chalcosis (Sunflower cataract); Iron causes **Siderosis bulbi** (Rusty discoloration/Iron cataract). * **Christmas Tree Cataract:** Seen in Myotonic Dystrophy. * **Oil Droplet Cataract:** Seen in Galactosemia.

Q: Cataract is NOT seen with which of the following conditions?

Vitamin B12 deficiency. **Explanation:** The correct answer is **Vitamin B12 deficiency**. While Vitamin B12 deficiency is associated with optic neuropathy (tobacco-alcohol amblyopia) and retinal hemorrhages, it is **not** a recognized cause of cataract. **Why the other options are associated with Cataract:** * **Steroids (Option A):** Long-term use of systemic or topical corticosteroids is a classic cause of **Posterior Subcapsular Cataract (PSC)**. This occurs due to the interference with lens fiber differentiation and glucose metabolism within the lens. * **Diabetes Mellitus (Option C):** Hyperglycemia leads to the accumulation of **sorbitol** via the polyol pathway (aldose reductase enzyme). Sorbitol acts as an osmotic agent, drawing water into the lens, leading to "Snowflake cataracts" in juveniles or early-onset senile cataracts in adults. * **Homocystinuria (Option D):** This metabolic disorder is characterized by a deficiency of cystathionine beta-synthase. It leads to **ectopia lentis** (downward and inward subluxation) and frequently results in early-onset cataracts. **NEET-PG High-Yield Pearls:** 1. **True Diabetic Cataract:** Characterized by bilateral "Snowflake" opacities. 2. **Steroid-Induced Cataract:** Most commonly presents as Posterior Subcapsular Cataract (PSC). 3. **Galactosemia:** Associated with "Oil droplet" cataracts. 4. **Myotonic Dystrophy:** Associated with "Christmas tree" cataracts. 5. **Wilson’s Disease:** Associated with "Sunflower" cataracts (though this is technically a copper deposition in the capsule, not a true lenticular opacity). 6. **Hypocalcemia:** Can lead to punctate, polychromatic "Zonular" cataracts.

Q: Ectopia lentis is seen in which of the following conditions?

All of the above. **Explanation:** **Ectopia lentis** refers to the displacement or malposition of the crystalline lens from its normal anatomical location, typically due to the dysfunction or disruption of the ciliary zonules. **Why "All of the above" is correct:** Ectopia lentis is a hallmark feature of several systemic metabolic and genetic disorders. * **Hyperlysinemia:** An autosomal recessive metabolic disorder where an enzyme deficiency leads to elevated lysine levels. It is a rare but recognized cause of lens subluxation. * **Weill-Marchesani Syndrome:** A connective tissue disorder characterized by short stature, brachydactyly (short fingers), and **microspherophakia** (small, spherical lens). The abnormal lens shape often leads to downward subluxation and secondary angle-closure glaucoma. * **Sulfite Oxidase Deficiency:** A rare error of sulfur metabolism. It presents early in life with severe neurological impairment, seizures, and characteristic ectopia lentis. **High-Yield Clinical Pearls for NEET-PG:** To differentiate these conditions in clinical vignettes, remember the direction of displacement: 1. **Marfan Syndrome:** Most common cause; displacement is typically **Superotemporal** (Upward and Outward). 2. **Homocystinuria:** Second most common; displacement is **Inferonasal** (Downward and Inward). Associated with intellectual disability and a high risk of thromboembolism. 3. **Weill-Marchesani:** Displacement is usually **Inferior** (Downward). 4. **Trauma:** The most common cause of *acquired* (non-hereditary) ectopia lentis. **Summary:** Since Hyperlysinemia, Weill-Marchesani, and Sulfite Oxidase deficiency are all established systemic causes of lens displacement, the correct answer is **All of the above**.

Q: Ectopia lentis in a child is seen in which of the following diseases?

Homocystinuria. **Explanation:** **Ectopia lentis** refers to the displacement or subluxation of the crystalline lens from its normal position due to the disruption of the ciliary zonules. **Why Homocystinuria is correct:** Homocystinuria is an autosomal recessive metabolic disorder caused by a deficiency of the enzyme **cystathionine beta-synthase**. This leads to an accumulation of homocysteine, which interferes with the cross-linking of fibrillin, a key component of the lens zonules. In Homocystinuria, the lens typically undergoes **inferonasal subluxation** (downward and inward). It is the second most common cause of hereditary ectopia lentis after Marfan syndrome. **Analysis of Incorrect Options:** * **Sarcoidosis:** This is a multisystem granulomatous disease. Ocular involvement typically manifests as granulomatous uveitis, dry eyes, or retinal vasculitis, but not primary lens displacement. * **Alkaptonuria:** This is a disorder of tyrosine metabolism (deficiency of homogentisic acid oxidase). It causes **ochronosis** (dark pigmentation of sclera and cartilage) and arthritis, but does not affect the lens zonules. * **Urea Cycle Defects:** These disorders (e.g., Ornithine transcarbamylase deficiency) lead to hyperammonemia and neurological symptoms but are not associated with structural ocular defects like ectopia lentis. **High-Yield Clinical Pearls for NEET-PG:** * **Direction of Subluxation:** * **Marfan Syndrome:** Superotemporal (Upward and Outward) - *Most common cause.* * **Homocystinuria:** Inferonasal (Downward and Inward). * **Accommodation:** In Homocystinuria, accommodation is lost because the zonules are completely disintegrated, whereas in Marfan’s, some zonules remain intact. * **Other Causes:** Weill-Marchesani syndrome (microspherophakia with inferior subluxation), Sulfite oxidase deficiency, and trauma (most common cause of *acquired* ectopia lentis).

Q: A rollable lens is typically made up of which material?

Hydrogel. **Explanation:** The term **"rollable lens"** refers to a specific type of intraocular lens (IOL) or contact lens designed with high flexibility, allowing it to be folded or rolled into a small inserter. This allows for insertion through a micro-incision (often <2.0 mm), which is a hallmark of modern Phacoemulsification and Minimally Invasive Glaucoma Surgery (MIGS). 1. **Why Hydrogel is Correct:** Hydrogel (specifically **Hydrophilic Acrylic**) has a high water content, which imparts excellent flexibility and "memory." These lenses can be dehydrated to be made thin and then rehydrated, or simply folded/rolled due to their soft nature. They have a low refractive index but are preferred for their superior biocompatibility and ability to pass through ultra-small incisions. 2. **Why Other Options are Incorrect:** * **PMMA (Polymethyl methacrylate):** This is a **rigid, hard plastic**. It is non-foldable and non-rollable. Using a PMMA lens requires a larger incision (5-6 mm) equal to the diameter of the lens optic. * **Silicone:** While silicone lenses are **foldable**, they are generally thicker than hydrogel lenses. They are typically folded into a "taco" shape rather than being tightly "rolled" in the same manner as high-water-content hydrogels. **High-Yield Clinical Pearls for NEET-PG:** * **Ideal Material:** Hydrophobic acrylic is currently the "Gold Standard" for IOLs because it has a high refractive index (thinner lens) and the lowest rate of **Posterior Capsular Opacification (PCO)**. * **Rigid Gas Permeable (RGP) Lenses:** These are contact lenses made of cellulose acetate butyrate or silicone acrylate; they are NOT rollable. * **Mydricaine:** Often used in intraocular surgery to maintain pupillary dilation, which is crucial for the safe insertion of foldable/rollable lenses.

Q: Sunflower cataract is seen in which condition?

Copper Chalocosis. **Explanation:** **Sunflower cataract** is a classic clinical sign of **Chalcosis**, which refers to the intraocular deposition of copper. This occurs due to an intraocular copper-containing foreign body or systemic conditions like **Wilson’s disease** (Hepatolenticular degeneration). The copper ions deposit in the **anterior lens capsule** and subcapsular epithelium, radiating outward in a petal-like configuration, resembling a sunflower. **Analysis of Options:** * **Galactosemia (Option A):** Characterized by an **"Oil droplet" cataract**. This is due to the accumulation of dulcitol (galactitol) within the lens, causing osmotic swelling. * **Diabetes Mellitus (Option B):** Associated with **"Snowflake" cataracts** (subcapsular opacities) in young diabetics due to sorbitol accumulation. In adults, it typically leads to the early onset of senile nuclear cataracts. * **Hereditary Polyposis (Option D):** This is not typically associated with specific lens opacities. However, Gardner’s syndrome (a variant of FAP) is associated with **CHRPE** (Congenital Hypertrophy of Retinal Pigment Epithelium). **High-Yield Clinical Pearls for NEET-PG:** * **Wilson’s Disease:** Look for the triad of Sunflower cataract, **Kayser-Fleischer (KF) ring** (copper deposition in the Descemet’s membrane of the cornea), and neurological/hepatic symptoms. * **Christmas Tree Cataract:** Seen in Myotonic Dystrophy. * **Rosette-shaped Cataract:** Classic sign of Concussive Ocular Trauma. * **Shield Cataract:** Associated with Atopic Dermatitis. * **Posterior Subcapsular Cataract (PSC):** Most commonly associated with prolonged **Steroid use** or ionizing radiation.

Q: What is the earliest stage in the development of senile cortical cataract?

Incipient cataract. **Explanation:** Senile cortical cataract is a common age-related condition characterized by the hydration of lens fibers. The progression occurs in four distinct stages: 1. **Incipient Cataract (Correct Answer):** This is the **earliest stage**. It is characterized by the appearance of "cuneiform opacities" (wedge-shaped) in the periphery of the lens. While **lamellar separation** (hydration of sutures) is the very first pathological change, it is often considered a sub-stage or precursor. In the context of standard clinical staging, the **Incipient stage** is the recognized starting point of clinical cataract formation. 2. **Intumescent Cataract (Incorrect):** This is a progression of the incipient stage where the lens continues to absorb water, becoming swollen and "intumescent." This stage is clinically significant because the swollen lens can shallow the anterior chamber, potentially leading to secondary angle-closure glaucoma. 3. **Mature Senile Cataract (Incorrect):** In this stage, the entire lens becomes opaque (pearly white). The lens loses the excess water and returns to its normal size. Vision is typically reduced to "Hand Movements" or "Projection of Rays." 4. **Hypermature Cataract (Incorrect):** This is the final stage where the lens cortex liquefies (Morgagnian cataract) or the lens becomes shrunken and wrinkled due to water leakage (Sclerotic type). **High-Yield NEET-PG Pearls:** * **Cuneiform opacities:** Wedge-shaped opacities seen in cortical cataracts (start in the periphery). * **Cupuliform opacities:** Characteristic of Posterior Subcapsular Cataracts (start centrally). * **Iris Shadow Test:** Positive in the Immature stage; Negative in the Mature stage (because no clear cortex remains between the iris and the opacity). * **Most common cause of cataract worldwide:** Age-related (Senile).

Q: In extra-capsular cataract surgery, which part of the lens is excised?

Nucleus. In **Extracapsular Cataract Extraction (ECCE)**, the surgical principle is to remove the lens material while leaving the **posterior capsule** and the peripheral part of the anterior capsule (the capsular bag) intact. ### Why the Correct Answer is Right: * **Nucleus (C):** In ECCE, a large incision is made, an opening is created in the anterior capsule (capsulotomy), and the hard **nucleus** is expressed or delivered out of the eye. This is followed by the aspiration of the remaining cortex. Since the nucleus is the primary bulk of the cataractous lens being removed, it is the correct choice among the components listed. ### Why the Other Options are Wrong: * **Anterior capsule (A):** Only a portion of the anterior capsule (usually a central circular part) is removed to access the lens material. The peripheral rim is preserved to support the Intraocular Lens (IOL). * **Posterior capsule (B):** This is intentionally left **intact** in ECCE. It serves as a barrier between the anterior and posterior segments, preventing vitreous loss and providing a platform for "in-the-bag" IOL implantation. * **Whole lens (D):** Removal of the whole lens (including the entire capsule) is termed **Intracapsular Cataract Extraction (ICCE)**. This technique is largely obsolete due to higher risks of retinal detachment and cystoid macular edema. ### NEET-PG High-Yield Pearls: * **ECCE vs. Phacoemulsification:** Phacoemulsification is a form of ECCE where the nucleus is emulsified using ultrasound energy through a smaller incision. * **Primary Advantage of ECCE:** Preservation of the posterior capsule allows for **Posterior Chamber IOL (PCIOL)** placement, which is the physiological gold standard. * **Common Complication:** The most common late complication of ECCE/Phaco is **Posterior Capsular Opacification (PCO)**, also known as "After Cataract," treated with YAG laser capsulotomy.

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

Cataract. **Explanation:** In recurrent anterior uveitis, **Cataract** (specifically Complicated Cataract) is the most common complication. This occurs due to two primary mechanisms: 1. **Chronic Inflammation:** The presence of inflammatory mediators in the aqueous humor alters the metabolism of the lens fibers. 2. **Steroid Use:** Long-term topical or systemic corticosteroid therapy used to manage recurrences significantly accelerates posterior subcapsular cataract formation. **Analysis of Options:** * **Cataract (Correct):** It is the most frequent complication. The classic presentation is a "polychromatic luster" at the posterior pole of the lens (Breadcrumb appearance). * **Glaucoma:** This is the second most common complication. It can occur due to trabeculitis, peripheral anterior synechiae (PAS), or pupillary block (seclusio pupillae). While high-yield, it occurs less frequently than cataracts. * **Staphyloma:** This refers to the thinning and bulging of the sclera lined by uveal tissue. It is typically a complication of high myopia or scleritis, not standard anterior uveitis. * **Vitreous Hemorrhage:** This is more commonly associated with posterior segment pathologies like proliferative diabetic retinopathy or Eales' disease, rather than anterior uveitis. **NEET-PG High-Yield Pearls:** * **Most common cause of death in Uveitis:** Usually related to the underlying systemic disease (e.g., Ankylosing Spondylitis, Sarcoidosis). * **Cystoid Macular Edema (CME):** The most common cause of **permanent visual loss** in chronic uveitis. * **Band-shaped Keratopathy:** A classic complication seen specifically in **Juvenile Idiopathic Arthritis (JIA)** associated uveitis. * **Festooned Pupil:** Irregular pupillary dilatation due to the presence of posterior synechiae.

Question 1

A 60-year-old man, who underwent phacoemulsification surgery one year back, presents with a one-month history of gradual blurring of vision in the operated eye. The condition is not associated with pain, redness, or watering. He reports clear vision immediately following the surgery. What is the most common cause of this delayed visual impairment?

Accepted Answer

Posterior capsular opacification

Answer

Neovascular glaucoma

Answer

Chorioretinitis

Answer

Cystoid macular edema

Question 2

Ocular examination of a man with a systemic disease shows 'sunflower cataract'. This is typically due to:

Accepted Answer

Chalcosis

Answer

Diabetes mellitus

Answer

Systemic lupus erythematosus

Answer

Sarcoidosis

Question 3

Cataract is NOT seen with which of the following conditions?

Accepted Answer

Vitamin B12 deficiency

Answer

Steroids

Answer

Diabetes mellitus

Answer

Homocystinuria

Question 4

Ectopia lentis is seen in which of the following conditions?

Accepted Answer

All of the above

Answer

Hyperlysinemia

Answer

Weill-Marchesani syndrome

Answer

Sulfite oxidase deficiency

Question 5

Ectopia lentis in a child is seen in which of the following diseases?

Accepted Answer

Homocystinuria

Answer

Sarcoidosis

Answer

Alkaptonuria

Answer

Urea cycle defects

Question 6

A rollable lens is typically made up of which material?

Accepted Answer

Hydrogel

Answer

Polymethyl methacrylate (PMMA)

Answer

Silicone

Answer

None of the above

Question 7

Sunflower cataract is seen in which condition?

Accepted Answer

Copper Chalocosis

Answer

Galactosemia

Answer

Diabetes mellitus

Answer

Hereditary polyposis

Question 8

What is the earliest stage in the development of senile cortical cataract?

Accepted Answer

Incipient cataract

Answer

Lamellar separation

Answer

Intumescent cataract

Answer

Mature senile cataract

Question 9

In extra-capsular cataract surgery, which part of the lens is excised?

Accepted Answer

Nucleus

Answer

Anterior capsule

Answer

Posterior capsule

Answer

Whole lens

Question 10

What is the most common complication in recurrent anterior uveitis?

Accepted Answer

Cataract

Answer

Staphyloma

Answer

Glaucoma

Answer

Vitreous hemorrhage

Diseases of the Lens — MCQs

Diseases of the Lens — MCQs

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