Diseases of the Lens Practice Questions

Q: Which of the following is not an abnormality in lens shape?

Aphakia. **Explanation:** The question asks to identify which condition is **not** an abnormality in the **shape** of the lens. **Correct Answer: D. Aphakia** Aphakia refers to the **absence** of the crystalline lens from its normal anatomical position (the pupillary area). It is a condition of lens "presence/position" rather than "shape." It can be congenital, surgical (post-cataract extraction), or traumatic (due to extrusion or complete dislocation). **Analysis of Incorrect Options (Abnormalities in Shape/Size):** * **A. Spherophakia:** A condition where the lens is small and **spherical** in shape, rather than the normal biconvex shape. * **B. Microphakia:** Refers to a lens that is abnormally **small** in diameter. * **C. Microspherophakia:** A combination of both; the lens is both small (micro-) and spherical (sphero-). This is a classic feature of **Weill-Marchesani syndrome**. **High-Yield Clinical Pearls for NEET-PG:** * **Microspherophakia:** Highly associated with **Weill-Marchesani syndrome** (short stature, brachydactyly) and can lead to **inverse glaucoma** (pupillary block worsened by miotics). * **Lenticonus:** A cone-shaped protrusion of the lens surface. **Anterior lenticonus** is pathognomonic for **Alport Syndrome** (associated with sensorineural deafness and nephritis). * **Lentiglobus:** A localized globular bulge of the lens surface, usually posterior. * **Coloboma of Lens:** Not a true coloboma (no tissue loss), but a notch-like indentation caused by localized deficiency of ciliary body or zonules.

Q: In rosette-shaped cataract, the suture acts as a backbone in which stage?

Early-rosette cataract. **Explanation:** Rosette-shaped cataract is a classic manifestation of **mechanical ocular trauma** (concussive injury). The formation occurs due to the accumulation of fluid in the potential spaces between the lens fibers, specifically along the lines of the sutures. 1. **Why Option A is Correct:** In **Early-rosette cataract**, the opacification occurs in the subcapsular region and involves the **lens sutures**. The fluid clefts radiate from the sutures, making the suture itself act as the "backbone" or the central axis of the rosette petals. This typically involves the posterior cortex. 2. **Why Option B is Incorrect:** In **Late-rosette cataract**, the opacification is pushed deeper into the lens (cortex/medulla) as new clear lens fibers are formed over time. During this transition, the "petals" of the rosette become separated from the sutures by clear zones. Therefore, the suture no longer acts as the backbone; instead, the lesion appears as a more defined, flower-like shape buried within the lens substance. 3. **Why Options C and D are Incorrect:** The structural relationship between the suture and the opacification is the primary differentiating factor between the two stages. It is present only in the early stage. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause:** Blunt trauma (Concussion). * **Typical Location:** Usually found in the **posterior cortex** (due to the thinness of the posterior capsule and the impact of counter-coup forces). * **Vossius Ring:** Often associated with rosette cataracts; it is a circular ring of iris pigment on the anterior lens capsule following blunt trauma. * **Other Traumatic Cataracts:** "Sunflower cataract" is associated with **Chalcosis** (copper foreign body), not mechanical trauma.

Q: Posterior subcapsular cataract is commonly associated with which of the following conditions?

All the above. **Explanation:** **Posterior Subcapsular Cataract (PSC)** is a specific type of lens opacity located in the visual axis, just in front of the posterior capsule. It is highly significant in NEET-PG because it affects vision early (causing glare and difficulty reading) and is associated with specific systemic and ocular conditions. **Why "All the above" is correct:** 1. **Steroid Therapy (Option C):** This is the most common systemic cause of PSC. Both systemic and topical steroids lead to the migration of lens epithelial cells toward the posterior pole, where they enlarge to form **Wedl cells (bladder cells)**. 2. **Fuchs Heterochromic Cyclitis (Option A):** This is a chronic, low-grade uveitis. Complicated cataracts, specifically PSC, occur in about 75-90% of these patients due to altered aqueous humor dynamics and chronic inflammation. 3. **Neurofibromatosis Type 2 (Option B):** NF2 is classically associated with specific ocular findings, including **juvenile PSC** or posterior subcapsular opacities (found in ~60-80% of patients), often serving as a diagnostic clue for the condition. **Clinical Pearls for NEET-PG:** * **Symptoms:** Patients with PSC complain of **glare** (especially at night) and **near vision impairment** more than distance vision impairment (due to pupillary constriction during accommodation). * **Radiation:** PSC is also the characteristic cataract seen following exposure to **ionizing radiation** (X-rays/Gamma rays). * **Diabetes:** While "Snowflake cataract" is classic for juvenile diabetes, PSC is also frequently seen in adult diabetics. * **Morphology:** On slit-lamp examination, PSC often has a "bread-crumb" or "sandpaper" appearance.

Q: During cataractogenesis, lens striae appear first in which quadrant?

Lower nasal quadrant. ### Explanation The correct answer is **B. Lower nasal quadrant.** **Underlying Medical Concept:** In the development of **Senile Cortical Cataract**, the process begins with the hydration of lens fibers. This leads to the formation of water clefts and wedge-shaped opacities known as **cuneiform opacities** (lens striae). These opacities characteristically appear first in the **lower nasal quadrant** of the lens periphery. The anatomical reason for this specific localization is attributed to the **asymmetry of the zonular tension** and the fact that the lower nasal quadrant is often the most peripheral part of the lens, receiving relatively less protection from the iris and being subject to different metabolic stresses during early lens aging. These striae eventually extend toward the center, resembling the spokes of a wheel. **Analysis of Incorrect Options:** * **A, C, and D:** While cortical opacities eventually spread to involve the upper nasal, upper temporal, and lower temporal quadrants, they are rarely the site of primary origin. The progression typically follows a pattern where the lower nasal quadrant is involved first, followed by the lower temporal, and finally the upper quadrants. **Clinical Pearls for NEET-PG:** * **Stages of Cortical Cataract:** Lamellar separation → Incipient stage (cuneiform opacities) → Immature stage → Mature stage → Hypermature stage. * **Cuneiform vs. Cupuliform:** Cuneiform opacities are peripheral and wedge-shaped (cortical), whereas **Cupuliform opacities** are central and located in the posterior subcapsular layer. * **Visual Symptoms:** Patients with early cortical cataracts often complain of **glare** (due to light scattering by the striae) before a significant drop in visual acuity occurs. * **Morgagnian Cataract:** A form of hypermature cataract where the cortex liquefies and the nucleus sinks to the bottom of the capsular bag.

Q: The cataract seen in patients with CTG/CUG trinucleotide repeats is?

Christmas tree cataract. ### Explanation **Correct Answer: C. Christmas tree cataract** **Medical Concept:** The question refers to **Myotonic Dystrophy (Type 1)**, which is caused by an unstable expansion of **CTG trinucleotide repeats** in the *DMPK* gene (Type 2 involves CCTG repeats). The hallmark ocular finding in these patients is the **Christmas tree cataract**. This is characterized by polychromatic, needle-like crystals (cholesterol deposits) in the deep cortex and subcapsular regions of the lens that glisten with various colors under slit-lamp examination. Over time, these evolve into a more classic "stellate" posterior subcapsular opacification. **Analysis of Incorrect Options:** * **A. Snow flake cataract:** This is characteristic of **Diabetes Mellitus** (specifically Juvenile/Type 1 DM). It consists of subcapsular white opacities that resemble snowflakes. * **B. True exfoliation cataract:** This involves the delamination of the anterior lens capsule due to **infrared radiation (heat) exposure**, classically seen in glassblowers or furnace workers ("Glassblower’s cataract"). It is distinct from Pseudoexfoliation syndrome. **High-Yield Clinical Pearls for NEET-PG:** * **Myotonic Dystrophy:** Look for the triad of "Frontal balding, Myotonia (delayed muscle relaxation), and Christmas tree cataract." * **Genetics:** It exhibits **Anticipation** (symptoms become more severe/earlier in successive generations) due to the expansion of CTG repeats. * **Other "Tree" signs in Ophthalmology:** * *Dendritic ulcer:* Herpes Simplex Keratitis. * *Arborescent (Tree-like) pigmentation:* Seen in lightning strikes (Lichtenberg figures). * **Sunflower Cataract:** Seen in Wilson’s Disease (Copper deposition). * **Oil Droplet Cataract:** Seen in Galactosemia.

Q: A young, tall, thin male with archnodactyly has ectopia lentis in both eyes. What is the most likely diagnosis?

Marfan's syndrome. ### Explanation **1. Why Marfan’s Syndrome is Correct:** The clinical triad of a **young, tall, thin male** (marfanoid habitus), **arachnodactyly** (long, spider-like fingers), and **ectopia lentis** (dislocated lens) is the classic presentation of Marfan’s Syndrome. It is an autosomal dominant disorder caused by a mutation in the **FBN1 gene** on chromosome 15, leading to defective **fibrillin-1**. In Marfan’s, the lens dislocation is typically **superotemporal** (upward and outward), and the zonules usually remain intact but stretched. **2. Why the Other Options are Incorrect:** * **Homocystinuria:** While patients also have a marfanoid habitus, the lens dislocation is typically **inferonasal** (downward and inward). Key differentiators include intellectual disability, increased risk of thromboembolism, and a positive cyanide-nitroprusside urine test. Zonules are usually broken/disintegrated. * **Weill-Marchesani Syndrome:** This is the "inverse" of Marfan’s. Patients are **short in stature** with short, stubby fingers (brachydactyly) and may have microspherophakia (small, spherical lenses). * **Ehlers-Danlos Syndrome:** This is primarily a collagen disorder characterized by joint hypermobility and skin hyperextensibility. While it can involve blue sclera or angioid streaks, ectopia lentis is rare compared to Marfan's. **3. High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of heritable ectopia lentis:** Marfan’s Syndrome. * **Direction of subluxation:** Marfan’s = **Up** (Superotemporal); Homocystinuria = **Down** (Inferonasal). * **Systemic Association:** Always screen Marfan’s patients for **Aortic Aneurysm/Dissection** (most common cause of death). * **Microspherophakia:** Strongly associated with Weill-Marchesani Syndrome; can cause pupillary block glaucoma.

Q: What is the ideal rehabilitation for aphakia?

Posterior chamber intraocular lens implantation. **Explanation:** The goal of aphakia rehabilitation is to restore the refractive power of the eye after the crystalline lens is removed. **Why Posterior Chamber Intraocular Lens (PCIOL) is the Correct Answer:** PCIOL implantation in the **capsular bag** is the "Gold Standard" and ideal method for correcting aphakia. It most closely mimics the natural anatomy of the eye, placed at the nodal point. It provides the best quality of vision with minimal image magnification (approx. 1–2%), eliminates aniseikonia (difference in image size), and preserves peripheral vision. **Analysis of Incorrect Options:** * **Spectacle Correction:** Once common, it is now the least preferred due to the "Optical Vices of Aphakia." High-plus glasses cause ~25–30% image magnification, "Jack-in-the-box" scotoma, pincushion distortion, and the "heavy-frame" effect. * **Contact Lens Correction:** Better than spectacles (magnification ~7–10%), but carries risks of corneal vascularization and infections. It requires high manual dexterity, making it difficult for elderly patients. * **Anterior Chamber IOL (ACIOL):** Used only when capsular support is inadequate. It is not "ideal" because it carries a higher risk of corneal endothelial damage, secondary glaucoma, and UGH (Uveitis-Glaucoma-Hypherna) syndrome. **High-Yield Clinical Pearls for NEET-PG:** * **Magnification Comparison:** Spectacles (25-30%) > Contact Lenses (7-10%) > IOL (1-2%). * **Unilateral Aphakia:** IOL is the treatment of choice to prevent diplopia and aniseikonia. * **Secondary IOL:** If a PCIOL cannot be placed in the bag, the next best options are Scleral Fixated IOL (SFIOL) or Iris-claw lenses. * **Calculation:** The **SRK Formula** ($P = A - 2.5L - 0.9K$) is most commonly used to calculate IOL power.

Q: Soemmering's ring is seen in which of the following conditions?

After cataract. **Explanation:** **Soemmering’s Ring** is a classic morphological type of **After-cataract** (Posterior Capsular Opacification). It occurs following extracapsular cataract extraction (ECCE) or trauma when the central part of the lens is removed, but peripheral lens epithelial cells (LECs) remain trapped between the anterior and posterior capsular flaps. These cells proliferate and undergo metamorphosis, forming a doughnut-shaped ring of cortical matter in the periphery of the capsular bag. While the center remains clear, the ring can cause visual disturbances if it displaces or if the cells migrate centrally (Elschnig’s pearls). **Analysis of Options:** * **Option A (Posterior subcapsular cataract):** This is a primary cataract located in the visual axis just in front of the posterior capsule, often associated with steroid use or diabetes. It is not a postoperative complication. * **Option C (Endophthalmitis):** This is a severe intraocular inflammation/infection. While it can occur post-surgery, it presents with hypopyon and vitreous exudates, not capsular rings. * **Option D (Fuchs heterochromia iridis):** This is a chronic non-granulomatous uveitis characterized by iris atrophy and heterochromia. While it leads to complicated cataracts, it does not specifically form Soemmering’s ring. **High-Yield Clinical Pearls for NEET-PG:** 1. **Elschnig’s Pearls:** Another form of after-cataract where LECs migrate to the posterior capsule, appearing like "clusters of grapes" or "fish eggs." 2. **Treatment:** The gold standard for symptomatic after-cataract is **Nd:YAG Laser Capsulotomy**. 3. **Prevention:** Modern IOL designs (square-edge optics) and thorough cortical aspiration significantly reduce the incidence of Soemmering’s ring.

Question 1

Which of the following is not an abnormality in lens shape?

Accepted Answer

Aphakia

Answer

Spherophakia

Answer

Microphakia

Answer

Microspherophakia

Question 2

In rosette-shaped cataract, the suture acts as a backbone in which stage?

Accepted Answer

Early-rosette cataract

Answer

Late-rosette cataract

Answer

Both early and late-rosette cataract

Answer

Neither early nor late-rosette cataract

Question 3

In a pseudophakic eye, which of the following rays penetrate up to the retina?

Accepted Answer

UV-A

Answer

UV-B

Answer

UV-C

Answer

Infrared

Question 4

Posterior subcapsular cataract is commonly associated with which of the following conditions?

Accepted Answer

All the above

Answer

Fuchs heterochromic cyclitis

Answer

Neurofibromatosis Type 2

Answer

Steroid therapy

Question 5

During cataractogenesis, lens striae appear first in which quadrant?

Accepted Answer

Lower nasal quadrant

Answer

Upper nasal quadrant

Answer

Upper temporal quadrant

Answer

Lower temporal quadrant

Question 6

What technique of cataract extraction is used in the care of a subluxated lens?

Accepted Answer

Intracapsular Cataract extraction

Answer

Extracapsular Cataract extraction

Answer

Phacoemulsification

Answer

Small incision Cataract surgery

Question 7

The cataract seen in patients with CTG/CUG trinucleotide repeats is?

Accepted Answer

Christmas tree cataract

Answer

Snow flake cataract

Answer

True exfoliation cataract

Answer

None of the above

Question 8

A young, tall, thin male with archnodactyly has ectopia lentis in both eyes. What is the most likely diagnosis?

Accepted Answer

Marfan's syndrome

Answer

Marchesani's syndrome

Answer

Homocystinuria

Answer

Ehlers-Danlos syndrome

Question 9

What is the ideal rehabilitation for aphakia?

Accepted Answer

Posterior chamber intraocular lens implantation

Answer

Spectacle correction

Answer

Contact lens correction

Answer

Anterior chamber intraocular lens implantation

Question 10

Soemmering's ring is seen in which of the following conditions?

Accepted Answer

After cataract

Answer

Posterior subcapsular cataract

Answer

Endophthalmitis

Answer

Fuchs heterochromia iridis

Diseases of the Lens — MCQs

Diseases of the Lens — MCQs

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