Ophthalmic Surgery Practice Questions

Q: 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?

YAG laser capsulotomy. ***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.

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

Scleritis. ***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.

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

Trypan Blue. ***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

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

High frequency sound waves. ***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.

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

Sclerocorneal tunnel. ***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.

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

Femtosecond Laser. ***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.

Q: Which laser is commonly used to manage after cataract?

Nd:YAG laser. ***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.

Q: Where is the intraocular lens placed during cataract surgery?

Capsular bag. ***Capsular bag*** - The **capsular bag** is the natural anatomical space where the human crystalline lens resides and is the ideal location for an intraocular lens (IOL) to mimic the natural lens's position and function. - Placing the IOL in the capsular bag provides **optimal stability**, centration, and reduces the risk of complications such as glare or secondary glaucoma. *Surface of iris* - Placing an IOL on the surface of the iris (**iris-fixated IOL**) is a less common surgical approach, typically reserved for cases where capsular support is absent or insufficient. - This position can lead to potential complications including **iris chafing**, pigment dispersion, and increased risk of uveitis or secondary glaucoma. *Over the face of vitreous* - Placing an IOL over the face of the vitreous typically occurs in cases of **capsular rupture** with inadequate posterior capsule support, requiring anterior vitrectomy and alternative IOL fixation. - This position is less stable and carries a higher risk of **vitreous prolapse**, retinal detachment, and cystoid macular edema compared to capsular bag placement. *Around the limbus* - The limbus is the **junction between the cornea and sclera** and is an entirely incorrect location for an intraocular lens implant. - An IOL around the limbus would be outside the globe and would serve no optical purpose within the eye, leading to **severe visual impairment** and potentially structural damage.

Q: Enucleation of the eyeball is contraindicated in:

Panophthalmitis. ***Panophthalmitis*** - Enucleation is **relatively contraindicated** in **panophthalmitis** due to the high risk of spreading infection along the **optic nerve** to the **meninges**, potentially causing **meningitis** or brain abscess. - In panophthalmitis, the inflammatory process extends beyond the globe to involve **orbital tissues**, making enucleation potentially dangerous. - **Evisceration** (removing intraocular contents while preserving the scleral shell) is preferred over enucleation as it reduces the risk of CNS spread. - Medical management with systemic antibiotics is the first-line treatment. *Endophthalmitis* - **Endophthalmitis** is an infection confined to the interior of the eyeball (vitreous and aqueous humors). - Initial treatment is intravitreal antibiotics, but enucleation may be considered in severe, unresponsive cases to control infection and alleviate pain, especially if vision is unsalvageable. - This is an **indication** for enucleation in advanced cases, not a contraindication. *Intraocular tumours* - **Intraocular tumours**, such as retinoblastoma or choroidal melanoma, are common **indications** for enucleation to prevent metastasis and preserve life. - Enucleation is a crucial treatment for eliminating the tumour and preventing its spread. *Painful blind eye* - A **painful blind eye** is a frequent **indication** for enucleation, especially if the pain is severe and unresponsive to medical management. - Removing the eye can provide significant **pain relief** and improve the patient's quality of life.

Question 1

What are the advantages of phacoemulsification compared to traditional extracapsular cataract extraction (ECCE) in cataract surgery?

Accepted Answer

Lower risk of astigmatism and faster recovery compared to ECCE.

Answer

Requires less specialized equipment and is easier to perform.

Answer

Results in similar visual outcomes as ECCE.

Answer

Has higher complication rates compared to ECCE.

Question 2

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?

Accepted Answer

YAG laser capsulotomy

Answer

Observation

Answer

Topical steroids

Answer

Surgical removal

Question 3

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

Accepted Answer

Scleritis

Answer

Posterior capsule opacification

Answer

Endophthalmitis

Answer

Glaucoma

Question 4

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

Accepted Answer

Trypan Blue

Answer

Fluoroscein

Answer

India ink

Answer

Indocyanine Green

Question 5

What type of energy does phacoemulsification use in cataract surgery?

Accepted Answer

High frequency sound waves

Answer

Infrared waves

Answer

Ultraviolet rays

Answer

Laser energy

Question 6

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

Accepted Answer

Sclerocorneal tunnel

Answer

Continuous curvilinear capsulorrhexis

Answer

Foldable IOL implantation

Answer

Irrigation and drainage of cortex

Question 7

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

Accepted Answer

Femtosecond Laser

Answer

Neodymium Laser

Answer

Nanosecond Laser

Answer

Picosecond Laser

Question 8

Which laser is commonly used to manage after cataract?

Accepted Answer

Nd:YAG laser

Answer

Excimer laser

Answer

Argon green laser

Answer

Diode laser

Question 9

Where is the intraocular lens placed during cataract surgery?

Accepted Answer

Capsular bag

Answer

Surface of iris

Answer

Around the limbus

Answer

Over the face of vitreous

Question 10

Enucleation of the eyeball is contraindicated in:

Accepted Answer

Panophthalmitis

Answer

Endophthalmitis

Answer

Intraocular tumours

Answer

Painful blind eye

Ophthalmic Surgery — MCQs

Ophthalmic Surgery — MCQs

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