Diseases of the Lens Practice Questions

Q: Which is the best intraocular lens (IOL) position?

Posterior chamber. **Explanation:** The **Posterior Chamber (PC-IOL)** is the gold standard and the most physiological position for an intraocular lens. Specifically, placement **"in-the-bag"** (within the capsular bag) is the ideal location as it mimics the natural position of the crystalline lens. **Why Posterior Chamber is the Best:** 1. **Anatomical Position:** It is located behind the iris, maintaining the normal anatomy of the anterior segment. 2. **Reduced Complications:** It minimizes contact with the corneal endothelium, iris, and the trabecular meshwork, leading to lower rates of corneal edema, uveitis, and secondary glaucoma. 3. **Optical Stability:** It provides better centration and a more stable refractive outcome with minimal image magnification (approx. 1–2%). **Why Other Options are Incorrect:** * **Anterior Chamber (A-IOL) & Angle Supported:** These are placed in front of the iris. They carry a higher risk of damaging the corneal endothelium (leading to pseudophakic bullous keratopathy) and causing chronic inflammation or secondary glaucoma due to proximity to the drainage angle. * **Iris Supported:** These lenses (e.g., Iris Claw lens) are fixed to the iris tissue. They are associated with chronic low-grade iritis, iris atrophy, and pupillary distortion. **High-Yield Clinical Pearls for NEET-PG:** * **Ideal Site:** Capsular bag (In-the-bag). * **Second Best Site:** Ciliary Sulcus (if the posterior capsule is ruptured but peripheral support remains). * **IOL Power Calculation:** Most commonly uses the **SRK-II or SRK/T formula**. * **Material of Choice:** Foldable **Hydrophobic Acrylic** is currently preferred for its low rate of Posterior Capsular Opacification (PCO).

Q: The early changes in corticosteroid-induced cataract are in the form of:

Central posterior subcapsular lens changes. **Explanation:** The hallmark of **corticosteroid-induced cataracts** is the development of **Central Posterior Subcapsular (PSC) opacities**. This occurs regardless of the route of administration (topical, systemic, or inhaled). 1. **Why Option A is Correct:** Steroids interfere with the active transport of electrolytes and water in the lens fibers. This leads to the migration of lens epithelial cells from the equator toward the posterior pole. These cells enlarge and become "bladder cells" (Wedl cells), forming a granular opacity directly under the posterior capsule, typically in the central visual axis. 2. **Why Incorrect Options are Wrong:** * **Option B (Anterior conical):** This is characteristic of *Lenticonus* (as seen in Alport syndrome), not steroid use. * **Option C (Nuclear):** Nuclear sclerosis is primarily associated with senile (age-related) cataracts or smoking, characterized by hardening and yellowing of the lens nucleus. * **Option D (Diffuse):** While advanced steroid cataracts can eventually involve the whole lens, the *early* and classic presentation is localized to the posterior subcapsular region. **High-Yield Clinical Pearls for NEET-PG:** * **Dose-Dependency:** Steroid cataracts are both dose-dependent and duration-dependent. * **Visual Impact:** PSC cataracts affect vision significantly, especially in bright light (due to miosis) and for near work. * **Reversibility:** Unlike steroid-induced glaucoma (which may resolve), steroid-induced cataracts are generally **irreversible** even after stopping the medication. * **Differential Diagnosis:** PSC opacities are also seen in **Diabetes Mellitus**, **Ionizing Radiation**, and **Chronic Uveitis**.

Q: What causes a 'Rosette cataract'?

Trauma. **Explanation:** **Correct Answer: C. Trauma** A **Rosette-shaped cataract** is a classic sign of blunt ocular trauma. When the eye sustains a mechanical impact, hydraulic shockwaves travel through the lens. This leads to the separation of lens fibers along their natural suture lines, particularly in the posterior subcapsular cortex. The resulting opacification follows the anatomical pattern of the lens sutures, creating a characteristic "flower-shaped" or "star-shaped" appearance. While it typically appears shortly after trauma, it can sometimes remain stationary or progress over years. **Analysis of Incorrect Options:** * **A. Diabetes:** Diabetic cataracts typically present as **"Snowflake cataracts"** (subcapsular opacities) due to osmotic swelling caused by sorbitol accumulation. * **B. After cataract:** Also known as Posterior Capsular Opacification (PCO), this occurs following cataract surgery. Common forms include **Elschnig’s pearls** or **Soemmering’s ring**, but not rosette patterns. * **D. Gaucher's disease:** This lysosomal storage disorder is not typically associated with rosette cataracts; it more commonly presents with pinguecula-like lesions or retinal findings. **High-Yield Clinical Pearls for NEET-PG:** * **Vossius Ring:** A circular ring of pigment on the anterior lens capsule, also caused by blunt trauma (imprint of the iris). * **Sunflower Cataract:** Associated with **Wilson’s Disease** (copper deposition). * **Oil Droplet Cataract:** Pathognomonic for **Galactosemia**. * **Christmas Tree Cataract:** Seen in **Myotonic Dystrophy**. * **Shield Cataract:** Associated with **Atopic Dermatitis**.

Q: Type of cataract in chalcosis is

Sunflower cataract. **Explanation:** **1. Why Sunflower Cataract is correct:** Chalcosis refers to the intraocular deposition of copper, typically following a copper-containing intraocular foreign body. Copper ions deposit in the basement membranes of the eye. In the lens, copper accumulates under the **posterior lens capsule**, radiating outwards in a petal-like configuration from the center. This characteristic appearance resembles a **Sunflower**. It is important to note that sunflower cataracts are usually reversible if the foreign body is removed and rarely cause significant visual impairment. **2. Why the other options are incorrect:** * **Blue dot Cataract (Punctate cataract):** This is the most common type of **congenital cataract**. It appears as small, bluish, opaque dots scattered throughout the lens and is usually non-progressive and asymptomatic. * **Snowflake cataract:** This is the classic finding in **Juvenile Diabetes Mellitus**. It consists of subcapsular white opacities that resemble snowflakes, caused by osmotic swelling of lens fibers due to sorbitol accumulation. * **Polychromatic lustre:** This refers to a "rainbow-like" play of colors seen at the posterior pole of the lens. It is the hallmark of a **Complicated Cataract**, occurring secondary to intraocular inflammation (like chronic uveitis) or high myopia. **3. High-Yield Clinical Pearls for NEET-PG:** * **Kayser-Fleischer (KF) Ring:** Copper deposition in the **Descemet’s membrane** of the cornea (seen in Wilson’s disease and Chalcosis). * **Siderosis Bulbi:** Iron deposition in the eye, leading to a **rusty brown** discoloration of the lens (Cataracta lentis browni). * **Glass-blower’s cataract:** True exfoliation of the anterior capsule due to infrared radiation. * **Rosette-shaped cataract:** Classically seen in **Concussive (Traumatic)** ocular injury.

Q: A 32-year-old patient presents with blurred vision, photophobia, and mild ocular pain. Examination reveals aqueous flares and keratic precipitates in the anterior chamber. What is the likely diagnosis?

D. Iridocyclitis. ***D. Iridocyclitis***- **Iridocyclitis** is the preferred term for **anterior uveitis**, which involves inflammation of the iris and ciliary body.- The hallmark signs of **aqueous flares** (protein and cells in the anterior chamber) and **keratic precipitates** (inflammatory cell deposits on the corneal endothelium) confirm that the inflammation is localized to the **anterior chamber**.*A. Intermediate uveitis*- Characterized by inflammation primarily in the **vitreous** and **pars plana**, often referred to as *vitritis*.- While it causes blurred vision and floaters, the anterior chamber signs like *aqueous flares* and *keratic precipitates* are not the dominant features; fundoscopy may reveal **snowbanking**.*B. Posterior uveitis*- Involves inflammation of the **retina** and/or **choroid** (e.g., retinitis or choroiditis), often causing significant central vision loss and scotomas.- The primary findings are located in the posterior segment (fundus lesions), and the anterior chamber is often **quiet** or shows only mild reaction.*C. Toxoplasma uveitis*- This is a specific cause of **posterior uveitis**, typically presenting as a focus of **necrotizing retinitis** adjacent to an old, pigmented scar.- Although it can cause a *secondary* anterior chamber reaction, the primary diagnostic feature is the specific retinal lesion, which is not mentioned in this presentation.

Q: A 45-year-old patient with eye examination findings of a deep anterior chamber and jet-black pupil is prescribed +12D glasses. Likely diagnosis?

Aphakia. **Aphakia** - The natural lens contributes approximately +15 to +20 diopters of refractive power; its absence (aphakia) results in severe **hypermetropia**, requiring a strong convex lens, typically around **+10D to +12D**, for correction. - The clinical findings—a **deep anterior chamber** (due to the backward displacement of the iris) and a distinctive **jet-black pupil** (due to the lack of the lens obscuring the view of the retina/fundus)—are classic signs of aphakia. *Pseudophakia* - **Pseudophakia** is the state of having an **intraocular lens (IOL)**, which restores the eye's refractive power, meaning the patient typically needs minimal spectacle correction, usually < +3D, not +12D. - While the pupil might appear black, the necessary post-operative correction power rules out residual uncorrected aphakia that requires +12D. *Myopia* - **Myopia** (nearsightedness) requires **concave (minus)** lenses for correction, standing in direct contrast to the strong **convex (+12D)** lens prescribed to this patient. - Myopia is caused by excessive axial length or corneal curvature, and it does not result in a pathologically deep anterior chamber or necessitate high-plus glasses. *Hypermetropia* - Although aphakia causes hypermetropia, primary, non-aphakic **hypermetropia** is usually corrected with lenses significantly weaker than **+12D** (typically < +6D). - Primary hypermetropia is usually related to a short axial length but is not typically associated with the defining features of a **jet-black pupil** or an abnormally **deep anterior chamber**.

Q: A 70-year-old patient who has been using presbyopia glasses for the past few years can now read the newspaper comfortably without the glasses. What is the most likely diagnosis?

Index myopia. ***Index myopia*** - This classic phenomenon, often referred to as **"second sight,"** is caused by an increase in the refractive index of the crystalline lens nucleus due to early **nuclear sclerosis** (a type of cataract). - The change in refractive index leads to an acquired **myopic shift**, which effectively compensates for the patient's existing **presbyopia**, allowing near vision without reading glasses. *Index hypermetropia* - **Index hypermetropia** (a hyperopic shift) would significantly worsen the patient's near vision, making it even more difficult to read without correction. - It is typically associated with a decrease in the refractive index of the lens, sometimes seen in **cortical cataracts** or in highly unstable blood sugar levels (uncontrolled diabetes). *Regression of presbyopia* - **Presbyopia** is an irreversible, age-related process caused by the progressive hardening of the lens and loss of accommodative power. - A genuine biological **regression** of presbyopia does not occur; the apparent improvement in near vision is always attributable to an index shift toward **myopia**. *None of the above* - This option is incorrect because the sudden improvement in near vision in an elderly patient previously requiring reading glasses is a highly specific clinical sign of **index myopia** due to evolving **nuclear cataract**.

Q: An elderly patient presents with white, dandruff-like deposits on the anterior lens surface, seen during slit-lamp examination. What is the most likely diagnosis?

Pseudoexfoliation syndrome. ***Pseudoexfoliation syndrome*** - The pathognomonic finding of **white, dandruff-like material** deposited on the **anterior lens capsule** (often forming a characteristic clear central zone and peripheral zone separated by a clear space) is indicative of Pseudoexfoliation syndrome. - This material is an **abnormal fibrillar glycoprotein** that can block the trabecular meshwork, elevating intraocular pressure and predisposing the patient to **pseudoexfoliation glaucoma**. *Iris cyst* - An iris cyst appears as a localized, non-transilluminating mass or elevation within the iris stroma or attached to the pupil margin. - It does not present as diffuse **dandruff-like material** covering the lens surface, which is the hallmark of pseudoexfoliation. *Persistent pupillary membrane* - This is a **congenital anomaly** where remnants of the embryonic **tunica vasculosa lentis** persist, appearing as fine strands bridging the pupil or extending from the iris collar to the lens. - They are typically dark, thread-like structures, and are not the widespread **white deposits** usually seen in elderly patients with PEX. *Pigment dispersion syndrome* - This condition involves the dispersion of **iris pigment**, which classically manifests as a **Krukenberg spindle** (vertical pigment line on the corneal endothelium) and dense pigment deposits in the trabecular meshwork. - The deposits are visually **brown/black (pigmentary)**, not white/gray as described in PEX, and they primarily affect the corneal endothelium and trabecular meshwork.

Q: A short stature patient presents with the following presentation. Diagnosis is:

Weil-Marchesani syndrome. ***Weil-Marchesani syndrome*** - The image shows **microspherophakia** and **ectopia lentis**, which are characteristic ocular findings in Weil-Marchesani syndrome. - This syndrome is also associated with **short stature**, a key feature mentioned in the patient's presentation. *Homocystinuria* - While homocystinuria can cause **ectopia lentis**, the lens is typically displaced **inferomedially** and without microspherophakia. - Patients with homocystinuria often present with a **Marfanoid habitus** (tall stature, long limbs), which contradicts the "short stature" described. *Marfan syndrome* - Marfan syndrome is associated with **ectopia lentis**, usually with the lens displaced **superotemporally**, rather than the anterior displacement seen in the image. - Patients with Marfan syndrome are typically **tall** with an asthenic build, not short stature. *Ehlers-Danlos syndrome* - Ehlers-Danlos syndrome is primarily characterized by **skin hyperextensibility**, **joint hypermobility**, and **tissue fragility**. - While ocular involvement can occur (e.g., blue sclera, keratoconus), **ectopia lentis** and **microspherophakia** are not typical primary findings, and short stature is not a defining characteristic.

Question 1

Acquired blue blindness is a feature of which of the following?

Accepted Answer

Increased sclerosis of the crystalline lens

Answer

Disease of the optic nerve

Answer

Disease of the macula

Answer

All of the above

Question 2

Which is the best intraocular lens (IOL) position?

Accepted Answer

Posterior chamber

Answer

Anterior chamber

Answer

Iris supported

Answer

Angle supported

Question 3

The early changes in corticosteroid-induced cataract are in the form of:

Accepted Answer

Central posterior subcapsular lens changes

Answer

Anterior conical lens changes

Answer

Nuclear changes

Answer

Diffuse lens changes

Question 4

What causes a 'Rosette cataract'?

Accepted Answer

Trauma

Answer

Diabetes

Answer

After cataract

Answer

Gaucher's disease

Question 5

Type of cataract in chalcosis is

Accepted Answer

Sunflower cataract

Answer

Blue dot Cataract

Answer

Snowflake cataract

Answer

Polychromatic lustre

Question 6

A 32-year-old patient presents with blurred vision, photophobia, and mild ocular pain. Examination reveals aqueous flares and keratic precipitates in the anterior chamber. What is the likely diagnosis?

Accepted Answer

D. Iridocyclitis

Answer

A. Intermediate uveitis

Answer

B. Posterior uveitis

Answer

C. Toxoplasma uveitis

Question 7

A 45-year-old patient with eye examination findings of a deep anterior chamber and jet-black pupil is prescribed +12D glasses. Likely diagnosis?

Accepted Answer

Aphakia

Answer

Pseudophakia

Answer

Hypermetropia

Answer

Myopia

Question 8

A 70-year-old patient who has been using presbyopia glasses for the past few years can now read the newspaper comfortably without the glasses. What is the most likely diagnosis?

Accepted Answer

Index myopia

Answer

Index hypermetropia

Answer

Regression of presbyopia

Answer

None of the above

Question 9

An elderly patient presents with white, dandruff-like deposits on the anterior lens surface, seen during slit-lamp examination. What is the most likely diagnosis?

Accepted Answer

Pseudoexfoliation syndrome

Answer

Iris cyst

Answer

Persistent pupillary membrane

Answer

Pigment dispersion syndrome

Question 10

A short stature patient presents with the following presentation. Diagnosis is:

Accepted Answer

Weil-Marchesani syndrome

Answer

Homocystinuria

Answer

Marfan syndrome

Answer

Ehlers-Danlos syndrome

Diseases of the Lens — MCQs

Diseases of the Lens — MCQs

On this page

Practice by Chapter

Want unlimited practice?