Ophthalmic Surgery — MCQs

Ophthalmic Surgery Indian Medical PG Practice Questions and MCQs

Question 121: A patient with a history of cataract surgery presents with gradual vision loss. Examination reveals Elschnig's pearls on the posterior capsule. What is the most appropriate management?

A. Observation
B. YAG laser capsulotomy (Correct Answer)
C. Topical steroids
D. Surgical removal

Explanation: ***YAG laser capsulotomy*** - **Elschnig's pearls** are a form of **posterior capsule opacification (PCO)**, which is the most common complication after cataract surgery and causes gradual vision loss. - **YAG laser capsulotomy** is the standard, effective, and minimally invasive treatment to create an opening in the opacified posterior capsule, thereby restoring clear vision. *Observation* - This option is inappropriate because the patient is experiencing **symptomatic vision loss**, indicating that the PCO is clinically significant and requires intervention. - Waiting for symptoms to worsen without intervention would negatively impact the patient's quality of life and functionality. *Topical steroids* - **Topical steroids** are primarily used to reduce inflammation inside the eye, such as after surgery or in cases of uveitis. - They do not address the underlying cause of vision loss in PCO, which is the proliferation of lens epithelial cells, and therefore would not improve vision. *Surgical removal* - **Surgical removal** of the posterior capsule is a more invasive and complex procedure with higher risks compared to YAG laser capsulotomy. - YAG laser capsulotomy is highly effective, safe, and can be performed in an outpatient setting, making it the preferred treatment over open surgical intervention for PCO.

Question 122: Which of the following statements about the treatment of cataract in children is false?

A. Intraocular lens implantation can be performed after 2 years of age.
B. Lensectomy is not one of the methods of extracapsular extraction (Correct Answer)
C. ECCE is the treatment of choice
D. In case of bilateral cataract impairing vision, surgery must be done by 4-6 weeks of age.

Explanation: ***Lensectomy is not one of the methods of extracapsular extraction*** - This statement is **FALSE** and is the correct answer to this question. - **Lensectomy** is indeed a form of **extracapsular cataract extraction (ECCE)**, which involves removal of the lens material while leaving the lens capsule intact (at least initially). - In pediatric cataract surgery, lensectomy is frequently performed, especially in infants and young children, often combined with **posterior capsulotomy and anterior vitrectomy** to prevent posterior capsular opacification. *Intraocular lens implantation can be performed after 2 years of age* - This statement is **TRUE**. - IOL implantation can indeed be performed after 2 years of age and is generally preferred for older children. - While IOLs can be considered in select cases in children as young as 1-2 years, the safety and predictability improve with age, making 2+ years a reasonable guideline for routine IOL implantation. *In case of bilateral cataract impairing vision, surgery must be done by 4-6 weeks of age* - This statement is **generally TRUE** but represents an aggressive timeline. - For **bilateral congenital cataracts** significantly impairing vision, surgery is ideally performed by **6 to 8 weeks of age** to prevent irreversible **amblyopia**. - Early intervention (4-6 weeks) is often recommended for dense bilateral cataracts to minimize the critical period for visual development. *ECCE is the treatment of choice* - This statement is **TRUE**. - **Extracapsular cataract extraction (ECCE)** is the standard approach in pediatric cataracts. - Specific techniques include **lensectomy with posterior capsulotomy and anterior vitrectomy**, particularly in infants and younger children to manage the high risk of posterior capsular opacification.

Question 123: Which of the following dyes is commonly used for staining the lens in cataract surgery?

A. Trypan Blue (Correct Answer)
B. Fluoroscein
C. India ink
D. Indocyanine Green

Explanation: ***Trypan Blue*** - **Trypan blue** is routinely used in cataract surgery to stain the anterior capsule of the lens - This staining enhances visualization of the capsule, especially in cases of mature or white cataracts, facilitating a safer and more precise **capsulorhexis** - It selectively stains the anterior capsule while leaving the cortex and nucleus unstained, providing excellent contrast *Fluorescein* - **Fluorescein** is primarily used for diagnosing corneal abrasions, ulcers, and evaluating tear film integrity with a cobalt blue filter - It is also used as an **angiography dye** in fluorescein angiography for retinal vascular evaluation - Not used for staining the lens capsule during cataract surgery *India ink* - **India ink** is a permanent pigment not used in ophthalmology for diagnostic or surgical staining - Not biocompatible with ocular tissues and would cause irreversible, uncontrolled staining - Has potential toxicity and is not a medical-grade substance suitable for intraocular use *Indocyanine Green* - **Indocyanine Green (ICG)** is used in vitreoretinal surgery for staining the internal limiting membrane (ILM) and epiretinal membranes - Also used for indocyanine green angiography to visualize choroidal circulation - Not routinely used for anterior capsule staining in cataract surgery, as trypan blue is the preferred agent for this purpose

Question 124: What is a recent technological advancement in cataract surgery that enhances precision and safety?

A. Femtosecond Laser (Correct Answer)
B. Neodymium Laser
C. Nanosecond Laser
D. Picosecond Laser

Explanation: ***Femtosecond Laser*** - The **femtosecond laser** is a significant advancement in cataract surgery, enabling precise incisions in the cornea and lens capsule with high accuracy. - This technology automates critical steps such as **capsulorhexis** and **lens fragmentation**, reducing the need for manual instruments and enhancing safety. *Neodymium Laser* - A **neodymium laser (Nd:YAG)** is primarily used for **posterior capsulotomy** after cataract surgery, to treat **posterior capsular opacification (PCO)**, not for the primary cataract removal. - It is not used for creating incisions or fragmenting the lens during the initial cataract procedure. *Nanosecond Laser* - **Nanosecond lasers** are not a standard or recent technological advancement for cataract surgery; they are more commonly used in other medical applications like **tattoo removal** or **dermatology**. - Their pulse duration is too long for the precision required in cataract surgery, potentially causing more collateral damage. *Picosecond Laser* - **Picosecond lasers** are primarily used for **refractive surgery** (e.g., **LASIK flap creation**) and in dermatology for **pigment lesion treatment**, not for routine cataract removal. - While capable of high precision, they have not replaced femtosecond lasers as the leading technology for automating steps in cataract surgery.

Question 125: Which of the following steps is not done during phacoemulsification surgery for cataract?

A. Continuous curvilinear capsulorrhexis
B. Foldable IOL implantation
C. Sclerocorneal tunnel (Correct Answer)
D. Irrigation and drainage of cortex

Explanation: ***Sclerocorneal tunnel*** - A **sclerocorneal tunnel** is the characteristic incision for **manual small incision cataract surgery (MSICS)**, which is an alternative to phacoemulsification. - Phacoemulsification uses significantly smaller clear corneal incisions, typically 1.8-3.0 mm, rather than a larger sclerocorneal tunnel. *Continuous curvilinear capsulorrhexis* - **Continuous curvilinear capsulorrhexis (CCC)** is a crucial step in phacoemulsification, creating a smooth, continuous, and well-centered opening in the anterior capsule. - This step is essential for subsequent steps like hydrodissection, nucleus emulsification, and in-the-bag intraocular lens (IOL) placement. *Foldable IOL implantation* - After cataract removal by phacoemulsification, a **foldable intraocular lens (IOL)** is typically implanted through the small incision. - Foldable IOLs can be inserted through small incisions, which is consistent with the small incision size used in phacoemulsification. *Irrigation and drainage of cortex* - **Irrigation and aspiration (I/A)** of the residual cortical material is a standard and necessary step after emulsification of the nucleus during phacoemulsification. - This ensures a clear visual axis and prevents postoperative inflammation or opacification from retained cortex.

Question 126: What type of energy does phacoemulsification use in cataract surgery?

A. High frequency sound waves (Correct Answer)
B. Infrared waves
C. Ultraviolet rays
D. Laser energy

Explanation: ***High frequency sound waves*** - **Phacoemulsification** uses **ultrasound technology**, which involves **high-frequency sound waves** (typically 40-60 kHz) to emulsify the cataract. - The vibrations from these sound waves break the **cataractous lens** into tiny fragments for aspiration. - This is the standard **mechanical** method for lens fragmentation in modern cataract surgery. *Infrared waves* - **Infrared waves** are a form of **electromagnetic radiation** primarily associated with heat and thermal imaging, not for breaking down lens matter in cataract surgery. - They do not possess the mechanical vibratory properties necessary for **phacoemulsification**. *Ultraviolet rays* - **Ultraviolet (UV) rays** are a type of **electromagnetic radiation** that can be harmful to ocular tissues and are not used therapeutically for cataract removal. - They are associated with causing cataracts or procedures like **corneal collagen cross-linking**, not cataract removal. *Laser energy* - While **femtosecond lasers** can be used for lens fragmentation in **femtosecond laser-assisted cataract surgery (FLACS)**, traditional **phacoemulsification** specifically uses **ultrasonic energy**, not laser. - Laser is a complementary technology, not the primary energy in standard phacoemulsification.

Question 127: Which of the following is NOT a post-operative complication of cataract surgery?

A. Posterior capsule opacification
B. Endophthalmitis
C. Scleritis (Correct Answer)
D. Glaucoma

Explanation: ***Scleritis*** - **Scleritis** is an inflammation of the **sclera**, the white outer wall of the eye. It is typically associated with systemic autoimmune or inflammatory diseases, not a direct complication of cataract surgery. - While ocular inflammation can occur post-operatively, **scleritis** specifically is rare and not considered a standard or common sequela of cataract extraction. *Posterior capsule opacification* - **Posterior capsule opacification (PCO)**, also known as a **secondary cataract**, is the most common long-term complication of cataract surgery, occurring months to years later. - It results from the proliferation and migration of remaining lens epithelial cells on the posterior capsule, causing blurred vision. *Endophthalmitis* - **Endophthalmitis** is a rare but severe infection of the intraocular fluids and tissues, typically occurring within days to weeks after surgery. - It is a sight-threatening complication requiring urgent management with intravitreal antibiotics. *Glaucoma* - **Glaucoma** can be a post-operative complication, either due to inflammation (uveitic glaucoma), retained viscoelastic, or damage during surgery leading to increased intraocular pressure. - It can occur acutely or develop over time, potentially leading to optic nerve damage if not managed.

Question 128: Which laser is commonly used to manage after cataract?

A. Excimer laser
B. Argon green laser
C. Diode laser
D. Nd:YAG laser (Correct Answer)

Explanation: ***Nd:YAG laser*** - The **Nd:YAG laser** is the gold standard for treating **posterior capsule opacification (PCO)**, also known as after-cataract. - It creates a small opening in the **opacified posterior capsule** using **photodisruption**, restoring clear vision. *Excimer laser* - **Excimer lasers** are primarily used for **refractive surgery** like LASIK and PRK to reshape the cornea. - They are not used to treat posterior capsule opacification because their wavelength and mechanism of action are different. *Argon green laser* - **Argon green lasers** are typically used for **retinal photocoagulation**, such as in cases of diabetic retinopathy or retinal tears. - They are not suitable for addressing opacification of the posterior lens capsule. *Diode laser* - **Diode lasers** have various ophthalmologic applications, including transscleral cyclophotocoagulation for glaucoma or retinal photocoagulation. - They do not have the ability to effectively or safely perform a **posterior capsulotomy** for after-cataract.

Question 129: Which gas is most commonly used with pneumatic retinopexy?

A. CO2
B. N2
C. SF6
D. C3F8 (Correct Answer)

Explanation: ***C3F8*** - **Perfluoropropane (C3F8)** is commonly used in pneumatic retinopexy due to its longer expansion time and greater final volume compared to other gases. - Its prolonged presence in the vitreous cavity allows for sustained tamponade, which is crucial for successful reattachment of the retina in cases of **rhegmatogenous retinal detachment**. *SF6* - **Sulfur hexafluoride (SF6)** is also used in retinal surgery but has a shorter half-life and smaller final volume compared to C3F8. - While effective, its quicker absorption means less sustained tamponade, making it less ideal for pneumatic retinopexy where prolonged tamponade is often desired. *CO2* - **Carbon dioxide (CO2)** is not used for pneumatic retinopexy as it is highly soluble and rapidly absorbed, providing inadequate and non-sustained tamponade. - It is sometimes used during vitrectomy to induce gas-fluid exchange but not as a long-term tamponade agent. *N2* - **Nitrogen (N2)** is not used as a tamponade gas in pneumatic retinopexy. - Medical gases for vitreoretinal surgery are typically fluorinated gases (like SF6 and C3F8) with specific properties for safe and effective intraocular use.

Question 130: A patient sustained an eye injury leading to corneal opacification and complete vision loss in the affected eye. Following successful corneal grafting, the patient regained clear vision. According to injury severity classification, this injury would be categorized as:

A. Non-serious
B. Serious (Correct Answer)
C. Critical
D. Life-threatening

Explanation: ***Serious (Grievous Hurt)*** - According to **IPC Section 320**, an injury causing **permanent privation of sight of either eye** is classified as **grievous hurt** - At the time of injury, the patient had **complete vision loss** due to corneal opacification, which constitutes grievous hurt - In medico-legal classification, **injury severity is determined at the time of examination**, not after treatment outcomes - The fact that vision was later restored through corneal grafting does **not change the initial classification** of the injury - This principle is crucial in forensic medicine: **treatment success does not downgrade injury severity** *Non-serious (Simple Injury)* - Simple injuries are those that do **not fall under the definition of grievous hurt** - Complete vision loss clearly meets the criteria for **grievous hurt** (permanent privation of sight) - Even though vision was eventually restored, the initial injury severity was grievous, not simple *Critical* - Critical injuries typically refer to conditions requiring **immediate intensive care** with uncertain outcomes or multiple organ involvement - While the eye injury was severe, this term is not part of the standard **IPC Section 320 classification** - The correct legal classification for this injury is grievous hurt (serious), not critical *Life-threatening* - Life-threatening injuries pose **imminent danger to life** if untreated - Corneal injury with vision loss, while serious for visual function, does **not endanger life** - This injury falls under **grievous hurt** due to vision loss, not life-threatening category

Practice by Chapter

Surgical Anatomy of Eye

Practice Questions

Asepsis and Sterilization in Eye Surgery

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Anesthesia in Ophthalmic Surgery

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Cataract Surgery Techniques

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Corneal Surgeries

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Glaucoma Surgeries

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Oculoplastic Surgeries

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Vitreoretinal Surgeries

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Strabismus Surgery

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Refractive Surgery

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Ocular Oncology Surgeries

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Management of Surgical Complications

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