Ophthalmic Surgery Practice Questions

Q: Expulsive hemorrhage in cataract surgery is from?

Ciliary artery. ***Ciliary artery*** - Expulsive hemorrhage is a rare but devastating complication, typically resulting from the rupture of a **posterior ciliary artery** within the choroid. - This arterial rupture leads to a sudden, massive increase in intraocular pressure and extrusion of intraocular contents. *Vortex vein* - **Vortex veins** drain the choroid, and while their rupture could lead to hemorrhage, it is less likely to cause the highly pressurized, expulsive nature of a choroidal hemorrhage. - Hemorrhage from a vortex vein is generally less severe and less rapid in onset compared to arterial bleeding. *Choroidal vein* - **Choroidal veins** are part of the venous drainage system; bleeding from these vessels would typically be lower pressure and less likely to cause an expulsive hemorrhage. - Venous bleeds are generally slower and do not generate the rapid, violent pressure increase characteristic of expulsive hemorrhage. *None of the options* - This option is incorrect because the rupture of a ciliary artery is the direct cause of expulsive hemorrhage. - The other options are incorrect for the reasons stated above.

Q: Among the following organisms, which is the most common cause of postoperative endophthalmitis following corneal transplantation?

Staph epidermidis. ***Staph epidermidis*** - **Coagulase-negative Staphylococcus** (CoNS), including *S. epidermidis*, is the most frequent cause of **postoperative endophthalmitis** after both cataract surgery and corneal transplantation due to its presence on the normal ocular flora. - These organisms can form **biofilms on intraocular lenses** or transplanted corneal tissue, making eradication difficult. *Streptococcus* - While *Streptococcus* species can cause endophthalmitis, they are associated with a **more virulent and rapid onset** of severe inflammation and are not the most common causative agents of postoperative endophthalmitis compared to *S. epidermidis*. - They tend to cause more aggressive infections with often **poorer visual outcomes**. *Propionibacterium acnes* - *Propionibacterium acnes* can cause a **late-onset, indolent form of endophthalmitis**, typically months or even years after surgery. - While it is a recognized cause, it is far **less common** than *Staphylococcus epidermidis* in immediate or early postoperative cases. *Pseudomonas* - **Pseudomonas aeruginosa** is an aggressive and rapid-onset pathogen often associated with **severe keratitis** or **post-traumatic endophthalmitis**. - Although it can cause postoperative endophthalmitis, it is **much less common** than coagulase-negative staphylococci due to its infrequency on normal conjunctival flora.

Q: What is the absolute indication for enucleation?

Advanced intraocular retinoblastoma (Group D/E). ***Advanced intraocular retinoblastoma (Group D/E)*** - **Advanced retinoblastoma** (Group D/E by International Classification) is an **absolute indication** for enucleation to prevent metastasis and save the child's life. - Group D/E tumors have extensive retinal involvement, vitreous seeding, or are unlikely to respond to globe-salvage therapies. - The goal is to remove the entire tumor, thereby preventing life-threatening spread while preserving overall survival. - Early-stage retinoblastomas (Groups A-C) can often be treated with chemotherapy, laser photocoagulation, or cryotherapy without enucleation. *Mutilating ocular injury with infection risk* - While a severely **mutilated eye** with infection risk may warrant enucleation, it is not always an absolute indication. - Attempts may be made to salvage the globe if there is potential for vision preservation or cosmetic appearance, especially if no active endophthalmitis is present. *Severe endophthalmitis requiring enucleation* - **Severe endophthalmitis** can lead to permanent vision loss, but enucleation is considered a last resort. - Aggressive medical and surgical treatments such as **intravitreal antibiotics** and **vitrectomy** are typically attempted first to control infection and preserve the eye. *None of the options* - This option is incorrect because **advanced intraocular retinoblastoma** (Group D/E) is a clear and well-established absolute indication for enucleation when the tumor is too extensive for globe-salvage treatments.

Q: Which of the following is the most devastating complication of cataract surgery?

Endophthalmitis. ***Endophthalmitis*** - **Endophthalmitis** is a severe intraocular infection following cataract surgery that can rapidly lead to irreversible vision loss or even loss of the eye if not promptly treated. - It is considered the most devastating complication due to its acute onset and high potential for **permanent vision impairment**. *Optic neuropathy* - While optic neuropathy can cause visual loss, it is a less common direct complication of cataract surgery compared to endophthalmitis. - It typically results from processes like **ischemia** or severe orbital inflammation, which are rare occurrences immediately post-cataract surgery. *Retinal detachment* - **Retinal detachment** is a serious complication, but generally occurs at a lower rate than endophthalmitis and often has a better visual prognosis with timely surgical repair. - It is a known risk, particularly in patients with pre-existing **myopia** or prior posterior capsular rupture, but not necessarily the *most* devastating. *Vitreous loss* - **Vitreous loss** is an intraoperative complication that increases the risk of other issues like retinal detachment, cystoid macular edema, and endophthalmitis but is not, in itself, the most devastating. - Proper surgical technique and management during the procedure can mitigate many of its long-term sequelae.

Q: The term enucleation means:

Removal of eyeball along with a portion of optic nerve. ***Removal of eyeball along with a portion of optic nerve*** - **Enucleation** specifically refers to the surgical removal of the entire eyeball, typically including a portion of the **optic nerve**. - The extraocular muscles are detached from the globe but remain in the orbit, along with orbital fat and other structures. - This procedure is commonly performed for conditions such as severe trauma, intraocular tumors, or a blind, painful eye. *Removal of eyeball contents* - This describes **evisceration**, a procedure where the contents of the eyeball are removed, leaving the scleral shell and extraocular muscles intact. - Evisceration is often chosen to maintain orbital volume and allow for better prosthetic motility. *Removal of the eyeball along with surrounding orbital tissue* - This would represent a more extensive procedure than enucleation alone. - In enucleation, the globe is removed but the extraocular muscles, orbital fat, and other orbital structures are preserved to maintain orbital volume and support prosthetic fitting. - Removal of orbital tissue beyond the globe itself would describe **orbital exenteration**. *Removal of the eyeball along with extraocular muscles and part of skull* - This extensive procedure is known as **orbital exenteration**, which involves removal of the entire orbital contents, including the eyeball, extraocular muscles, fat, and sometimes bone. - **Exenteration** is reserved for aggressive malignancies that have extended beyond the globe into the orbit.

Q: Expulsive hemorrhage in cataract surgery is primarily caused by rupture of which vessels?

Choroidal vessels. ***Choroidal vessels*** - **Expulsive (suprachoroidal) hemorrhage** in cataract surgery is caused by rupture of **choroidal vessels**, particularly the **posterior ciliary arteries** and the rich vascular network in the **choroid**. - This rupture leads to sudden accumulation of blood in the **suprachoroidal space**, causing rapid expansion that can extrude intraocular contents through the surgical wound. - Risk factors include **sudden hypotony**, **hypertension**, **atherosclerosis**, and increased venous pressure. *Ciliary body vessels* - While the **ciliary body** has rich vasculature and is part of the uveal tract, the primary source of **expulsive hemorrhage** is the **posterior choroidal circulation**, not the ciliary body vessels. - The ciliary body is located more anteriorly, whereas expulsive hemorrhage typically originates from the **posterior segment** choroidal vessels. *Ciliary artery* - The **posterior ciliary arteries** do supply the choroid and are involved in the vascular supply, but the specific term for the site of rupture is the **choroidal vessels** (which includes the ciliary arterial branches and choroidal capillary network). - The term "ciliary artery" alone is less specific than "choroidal vessels" for describing the anatomical site of hemorrhage. *None of the options* - This option is incorrect because rupture of **choroidal vessels** is the well-established cause of expulsive hemorrhage in cataract surgery. - This is a recognized and preventable complication with specific risk factors and management protocols.

Q: Phacoemulsification incision is at what location?

Cornea. ***Correct: Cornea*** - The standard incision for **modern phacoemulsification** is a small (2.2-2.8mm), self-sealing **clear corneal incision**. - This incision is typically placed **1-2mm anterior to the limbus** in the temporal quadrant. - **Advantages:** Quicker healing, minimal induced astigmatism, reduced bleeding, sutureless technique, and excellent visualization. - Clear corneal incisions have become the **gold standard** for phacoemulsification since the 1990s. *Incorrect: Sclero-corneal junction* - While historically used for **limbal incisions** in traditional extracapsular cataract extraction (ECCE), this location is less common for modern phacoemulsification. - **Disadvantages:** Increased risk of bleeding from limbal vessels, potentially higher induced astigmatism, and longer healing time. - Some surgeons still use limbal or near-limbal approaches, but clear corneal incisions are preferred. *Incorrect: Sclera* - A primary incision through the **sclera alone** is not standard for phacoemulsification. - Scleral incisions may be used as **secondary port incisions** for instrument access or in specific surgical situations (e.g., combined procedures). - **Disadvantages:** Increased bleeding risk, poor visualization (non-transparent tissue), and typically requires suturing. *Incorrect: None of the options* - This is incorrect as **cornea** is definitively the correct location for standard phacoemulsification incisions in modern cataract surgery.

Q: Which of the following is the most important factor in the prevention of endophthalmitis in cataract surgery?

Preoperative preparation with povidone iodine. **Preoperative preparation with povidone iodine** - **Povidone-iodine (5%)** applied to the ocular surface is the **single most evidence-based intervention** for preventing endophthalmitis in cataract surgery. - Multiple randomized controlled trials, including the **ESCRS study**, demonstrate up to **75% reduction** in endophthalmitis risk with proper povidone-iodine antisepsis. - It rapidly reduces bacterial load on the conjunctiva and periocular skin, which are the primary sources of intraocular contamination. *One week antibiotic therapy prior to surgery* - Prolonged preoperative antibiotic therapy is **not recommended** and lacks evidence for reducing endophthalmitis. - Can lead to **antibiotic resistance** and disruption of normal ocular flora without proven benefit. - Current guidelines do not support routine preoperative systemic or prolonged topical antibiotic prophylaxis. *Trimming of eyelashes* - **Not routinely recommended** and may actually increase bacterial counts temporarily due to microtrauma. - While maintaining a clean surgical field is important, eyelash trimming has **no proven benefit** in reducing endophthalmitis rates. - Good draping technique is more important than eyelash manipulation. *Use of intravitreal antibiotics* - **Intravitreal antibiotics** are injected into the vitreous cavity and are used for **treating established endophthalmitis**, not for prophylaxis. - For prophylaxis, **intracameral antibiotics** (e.g., cefuroxime or moxifloxacin injected into the anterior chamber at surgery end) are sometimes used, but they are adjunctive measures, not the primary preventive intervention. - **Povidone-iodine antisepsis** remains the most critical and cost-effective prophylactic measure with the strongest evidence base.

Q: Posterior capsular opacification (PCO) is treated by which laser?

Nd YAG. ***Nd YAG*** - **Nd:YAG (neodymium-doped yttrium aluminum garnet) laser** is the treatment of choice for posterior capsular opacification (PCO). - It uses **photodisruption** to create an opening in the opacified posterior capsule, restoring clear vision. *Argon laser* - **Argon laser** is primarily used for procedures like **panretinal photocoagulation (PRP)** in diabetic retinopathy or for certain types of glaucoma. - It operates by **photocoagulation**, which involves thermal destruction of tissue, unsuitable for the delicate capsular incision needed for PCO. *CO2 laser* - **CO2 lasers** are used in various surgical fields for cutting and ablating soft tissues, but not for intraocular procedures like PCO. - They produce **infrared light** that is strongly absorbed by water, making them suitable for surface tissue removal rather than precise incisions within the eye. *Excimer* - The **excimer laser** is primarily used in **refractive surgery** (e.g., LASIK, PRK) to reshape the cornea. - It operates by **photoablation**, precisely removing tissue without significant heat damage, but it is not used to treat PCO.

Q: A crucial step in the phacoemulsification procedure for a 70-year-old man scheduled for cataract surgery is which of the following?

Continuous curvilinear capsulorrhexis. ***Continuous curvilinear capsulorrhexis*** - This step creates a smooth, continuous, and appropriately sized opening in the **anterior lens capsule**, which is crucial for the safe and effective removal of the cataractous lens material. - A well-executed capsulorrhexis ensures the **intraocular lens (IOL)** can be stably implanted within the capsular bag, minimizing complications like IOL decentering. *Scleral buckling* - **Scleral buckling** is a surgical procedure primarily used to repair **retinal detachments**, not for cataract removal. - It involves placing a silicone band on the outer surface of the sclera to indent the eye wall, supporting the retina. *Corneal transplantation* - **Corneal transplantation** (keratoplasty) is performed to replace a diseased or damaged cornea, typically for conditions like **keratoconus** or corneal scarring. - It is not a component of routine cataract surgery. *Trabeculectomy* - **Trabeculectomy** is a surgical procedure to treat **glaucoma** by creating a new drainage pathway for aqueous humor, thereby reducing intraocular pressure. - It is unrelated to the process of cataract extraction.

Question 1

Expulsive hemorrhage in cataract surgery is from?

Accepted Answer

Ciliary artery

Answer

Vortex vein

Answer

Choroidal vein

Answer

None of the options

Question 2

Among the following organisms, which is the most common cause of postoperative endophthalmitis following corneal transplantation?

Accepted Answer

Staph epidermidis

Answer

Streptococcus

Answer

Pseudomonas

Answer

Propionibacterium acnes

Question 3

What is the absolute indication for enucleation?

Accepted Answer

Advanced intraocular retinoblastoma (Group D/E)

Answer

Mutilating ocular injury with infection risk

Answer

Severe endophthalmitis requiring enucleation

Answer

None of the options

Question 4

Which of the following is the most devastating complication of cataract surgery?

Accepted Answer

Endophthalmitis

Answer

Optic neuropathy

Answer

Retinal detachment

Answer

Vitreous loss

Question 5

The term enucleation means:

Accepted Answer

Removal of eyeball along with a portion of optic nerve

Answer

Removal of eyeball contents

Answer

Removal of the eyeball along with surrounding orbital tissue

Answer

Removal of the eyeball along with extraocular muscles and part of skull

Question 6

Expulsive hemorrhage in cataract surgery is primarily caused by rupture of which vessels?

Accepted Answer

Choroidal vessels

Answer

Ciliary artery

Answer

Ciliary body vessels

Answer

None of the options

Question 7

Phacoemulsification incision is at what location?

Accepted Answer

Cornea

Answer

Sclera

Answer

Sclero-corneal junction

Answer

None of the options

Question 8

Which of the following is the most important factor in the prevention of endophthalmitis in cataract surgery?

Accepted Answer

Preoperative preparation with povidone iodine

Answer

One week antibiotic therapy prior to surgery

Answer

Trimming of eyelashes

Answer

Use of intravitreal antibiotics

Question 9

Posterior capsular opacification (PCO) is treated by which laser?

Accepted Answer

Nd YAG

Answer

Argon laser

Answer

CO2 laser

Answer

Excimer

Question 10

A crucial step in the phacoemulsification procedure for a 70-year-old man scheduled for cataract surgery is which of the following?

Accepted Answer

Continuous curvilinear capsulorrhexis

Answer

Scleral buckling

Answer

Corneal transplantation

Answer

Trabeculectomy

Ophthalmic Surgery — MCQs

Ophthalmic Surgery — MCQs

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