Cataract Surgery Techniques — MCQs
Which of the following is NOT an approach followed in revised NPCB cataract surgeries?
A child presents with unilateral white reflex (leukocoria) and raised intraocular pressure, raising suspicion of retinoblastoma. Which of the following investigations is the most appropriate to perform?
Method followed to decrease post-op infection in cataract surgery:
In which of the following conditions does IOL implantation after cataract surgery require the greatest caution and specialized management?
All are ophthalmological emergencies except -
SAFE strategy is recommended for-
The laser procedure, most often used for treating iris neovascularization is
Which among the following is the BEST irrigating fluid during ECCE?
Floppy iris syndrome is associated with usage of
All are manifestation of dengue virus infection in eye except?
Cataract Surgery Techniques Indian Medical PG Practice Questions and MCQs
Question 1: Which of the following is NOT an approach followed in revised NPCB cataract surgeries?
- A. Mobile surgical camps
- B. Consistent follow-up care
- C. Fixed-site surgical treatment alone (excluding camps) (Correct Answer)
- D. Standardized distribution of resources
Explanation: ***Fixed-site surgical treatment alone (excluding camps)*** - The revised **National Programme for Control of Blindness and Visual Impairment (NPCBVI)** adopts a **multi-pronged integrated approach** combining both fixed-site facilities and mobile outreach camps. - Relying **exclusively on fixed-site treatment** without mobile camps is **not the strategy** of the revised program, as this would limit access for rural and underserved populations. - The program emphasizes **both institutional capacity** (fixed sites at district hospitals and eye hospitals) **and community outreach** (mobile surgical camps) working together. *Mobile surgical camps* - **Mobile camps** are a crucial strategy in the revised NPCB to reach underserved populations in rural and remote areas. - They enhance **accessibility to care** and increase surgical coverage, particularly in areas without nearby fixed facilities. - Camps are conducted with **quality standards** and linked to fixed sites for follow-up care. *Consistent follow-up care* - **Comprehensive follow-up** is a cornerstone of the revised NPCB to ensure positive outcomes and address complications. - This includes **post-operative care protocols** at both camp and fixed-site surgeries to reduce morbidity. - Follow-up mechanisms help achieve the program's goal of **quality cataract surgery outcomes**. *Standardized distribution of resources* - The revised NPCB promotes **equitable and efficient allocation** of resources to ensure quality cataract services across regions. - This includes distribution of **equipment, consumables, trained personnel, and funding** based on need and surgical load. - Resource standardization helps maintain **quality benchmarks** across different service delivery models.
Question 2: A child presents with unilateral white reflex (leukocoria) and raised intraocular pressure, raising suspicion of retinoblastoma. Which of the following investigations is the most appropriate to perform?
- A. Ultrasound imaging of the eye
- B. Measurement of intraocular pressure
- C. Detailed examination under anesthesia (Correct Answer)
- D. CT imaging of the orbit and head
Explanation: ***Detailed examination under anesthesia*** - A **detailed examination under anesthesia (EUA)** is crucial for accurately assessing the extent of intraocular lesions in children, particularly those with suspected retinoblastoma. It allows for a thorough and precise evaluation of tumor size, location, and multifocality that is otherwise difficult to achieve in an awake child. - EUA often includes fundus photography, ultrasonography, and sometimes anterior segment examination, all performed systematically without the child moving. It is the gold standard for **diagnosing and staging retinoblastoma**. *Ultrasound imaging of the eye* - **Ocular ultrasound** is a key component of the investigation and can help identify the intraocular mass and detect calcifications, which are characteristic of retinoblastoma. - However, ultrasound alone is often insufficient to fully characterize the tumor's extent or for precise staging, and it doesn't replace the need for direct visualization and comprehensive examination. *Measurement of intraocular pressure* - **Raised intraocular pressure** is a symptom that can be present in retinoblastoma but is not a diagnostic tool for the condition itself; it indicates secondary glaucoma due to the tumor. - While important for clinical management, measuring IOP does not directly visualize or characterize the tumor to confirm the diagnosis of retinoblastoma. *CT imaging of the orbit and head* - While **CT imaging** can detect orbital and intracranial extension of retinoblastoma, it involves **ionizing radiation**, which is a significant concern in children, especially those with an increased genetic risk for secondary cancers. - **MRI** is generally preferred over CT for assessing extraocular extension and possible central nervous system involvement due to its superior soft tissue contrast and lack of radiation exposure.
Question 3: Method followed to decrease post-op infection in cataract surgery:
- A. Topical antibiotics and sterile draping
- B. Topical antibiotics alone
- C. Topical antibiotics and sterile instruments
- D. Intracameral antibiotics and betadine wash (Correct Answer)
Explanation: ***Intracameral antibiotics and betadine wash*** - **Intracameral antibiotics** (e.g., cefuroxime, moxifloxacin) directly target the anterior chamber during surgery, effectively reducing the risk of **endophthalmitis**. - A **betadine (povidone-iodine) wash** of the ocular surface preoperatively significantly reduces bacterial load, preventing introduction of microbes into the surgical field. *Topical antibiotics and sterile draping* - While **topical antibiotics** are important, they may not achieve sufficient intraocular concentrations to prevent deep infection effectively. - **Sterile draping** is essential for maintaining a sterile field but does not address potential intrinsic bacterial flora on the conjunctiva or adnexa as thoroughly as a betadine wash. *Topical antibiotics alone* - **Topical antibiotics** alone are often insufficient to prevent **intraocular infections** because they may not penetrate the eye adequately to eradicate all pathogens. - This approach lacks the comprehensive germicidal action of a **betadine wash** on the ocular surface and the direct intraocular effect of intracameral antibiotics. *Topical antibiotics and sterile instruments* - **Sterile instruments** are a fundamental and non-negotiable part of any surgical procedure to prevent infection from external sources. - However, relying solely on **topical antibiotics** and sterile instruments overlooks the importance of reducing the patient's own **periocular bacterial flora** (addressed by betadine wash) and directly treating potential intraocular contamination (addressed by intracameral antibiotics).
Question 4: In which of the following conditions does IOL implantation after cataract surgery require the greatest caution and specialized management?
- A. Fuchs' heterochromic iridocyclitis
- B. Psoriatic arthritis
- C. Reiter's syndrome
- D. Juvenile rheumatoid arthritis (Correct Answer)
Explanation: ***Juvenile rheumatoid arthritis*** - Patients with **juvenile rheumatoid arthritis (JRA)**, particularly those with **pauciarticular JRA** and **ANA positivity**, are at high risk for developing chronic uveitis, which can lead to significant cataract formation and severe postoperative complications. - Due to the high risk of severe postoperative inflammation, glaucoma, and vision loss, IOL implantation in JRA patients requires extensive preoperative optimization of inflammation and careful intraoperative/postoperative management. *Fuchs' heterochromic iridocyclitis* - This condition presents with chronic, low-grade, **non-granulomatous anterior uveitis** and often leads to cataract formation. - While IOL implantation in these patients is generally well-tolerated, it does not pose the same high risk of severe postoperative inflammation and complications as seen in JRA-associated uveitis. *Psoriatic arthritis* - Psoriatic arthritis can be associated with acute anterior uveitis, but it typically presents as an acute, intermittent inflammation. - The risk of chronic, severe uveitis leading to complex cataract surgery and significant postoperative complications is not as consistently high or as severe as in JRA. *Reiter's syndrome* - Reiter's syndrome (now part of **reactive arthritis**) is another seronegative spondyloarthropathy that can cause acute anterior uveitis. - Similar to psoriatic arthritis, the uveitis is usually acute and self-limiting, and while ocular inflammation needs to be controlled, the risk profile for IOL implantation is not as challenging as in JRA.
Question 5: All are ophthalmological emergencies except -
- A. Endophthalmitis
- B. CRVO (Correct Answer)
- C. Acute congestive glaucoma
- D. CRAO
Explanation: ***CRVO*** - Central Retinal Vein Occlusion (CRVO) is characterized by painless **vision loss** due to retinal hemorrhage and edema, but it is generally *not* considered an immediate, vision-threatening emergency in the same vein as the other options. - While it requires prompt evaluation and management to preserve vision, CRVO allows for a less urgent intervention compared to conditions that can lead to permanent vision loss within hours. *Endophthalmitis* - **Endophthalmitis** is a severe inflammation of the intraocular fluids and tissues, typically caused by infection, and can lead to rapid and irreversible vision loss if not treated urgently. - It presents with pain, redness, reduced vision, and hypopyon (pus in the anterior chamber), necessitating immediate antibiotic treatment and surgical intervention. *Acute congestive glaucoma* - **Acute congestive glaucoma** (acute angle-closure glaucoma) involves a sudden increase in intraocular pressure, causing severe pain, redness, corneal edema, and profound vision loss. - If left untreated, the high pressure can cause irreversible damage to the optic nerve within hours, making it a true ocular emergency. *CRAO* - **Central Retinal Artery Occlusion (CRAO)** is a sudden, painless loss of vision in one eye due to blockage of the central retinal artery, leading to retinal ischemia. - It is an ocular emergency because irreversible retinal damage and vision loss can occur within 90-120 minutes of the occlusion, requiring immediate intervention to restore blood flow.
Question 6: SAFE strategy is recommended for-
- A. Diabetic retinopathy
- B. Trachoma (Correct Answer)
- C. Glaucoma
- D. Cataract
Explanation: ***Trachoma*** * The **SAFE strategy (Surgery, Antibiotics, Facial Cleanliness, Environmental improvement)** is the WHO-recommended public health approach for the elimination of **trachoma**, a chronic eye infection caused by *Chlamydia trachomatis*. * This comprehensive strategy addresses both active infection and its blinding sequelae, specifically **trichiasis** (in-turned eyelashes) through surgery. *Diabetic retinopathy* * Management of diabetic retinopathy primarily involves **blood sugar control, regular ophthalmologic exams, laser photocoagulation, and anti-VEGF injections**, not the SAFE strategy. * The focus is on preventing and treating retinal damage caused by **diabetes**, which is distinct from infectious causes. *Glaucoma* * Glaucoma is characterized by **optic nerve damage** and visual field loss, usually due to elevated intraocular pressure, and is managed with **medication, laser therapy, or surgery (e.g., trabeculectomy)**. * It is a **neurodegenerative condition**, not an infectious disease, so the SAFE strategy is not applicable. *Cataract* * Cataracts involve the **clouding of the natural lens** of the eye, leading to blurred vision, and are primarily treated through **surgical removal of the cloudy lens** and implantation of an artificial intraocular lens. * This condition is age-related or can be caused by trauma or disease, but it is **not an infection** for which the SAFE strategy would be relevant.
Question 7: The laser procedure, most often used for treating iris neovascularization is
- A. Panretinal photocoagulation (PRP) (Correct Answer)
- B. Laser iridoplasty
- C. Laser trabeculoplasty
- D. Goniophotocoagulation
Explanation: ***Panretinal photocoagulation (PRP)*** - **PRP** is the most effective laser procedure for **iris neovascularization** and **neovascular glaucoma**, as it ablates the ischemic retina, reducing the production of **vascular endothelial growth factor (VEGF)**. - By destroying the ischemic peripheral retina, PRP reduces the **angiogenic drive** that leads to new vessel formation on the iris and in the angle. *Laser iridoplasty* - This procedure involves applying laser energy to the peripheral iris to cause contraction and widen the **anterior chamber angle**, primarily used for **angle-closure glaucoma**. - While it can open a closed angle, it does not address the underlying **ischemic drive** causing neovascularization. *Laser trabeculoplasty* - This procedure targets the **trabecular meshwork** to improve aqueous humor outflow, commonly used for **open-angle glaucoma**. - It does not directly affect **iris neovascularization** or the ischemic factors driving its development. *Goniophotocoagulation* - This involves directly lasering new vessels in the **anterior chamber angle**, often as an adjunct to PRP, but it's not the primary treatment to prevent **iris neovascularization**. - It treats existing vessels but does not address the underlying cause of **retinal ischemia** that promotes new vessel growth.
Question 8: Which among the following is the BEST irrigating fluid during ECCE?
- A. Ringer lactate
- B. Normal saline
- C. Balanced salt solution
- D. Balanced salt solution + glutathione (Correct Answer)
Explanation: ***Balanced salt solution + glutathione*** - **Balanced salt solution with glutathione** is considered the best irrigating fluid for ECCE because it closely mimics the **natural aqueous humor**, maintaining corneal endothelial cell health and viability during surgery. - The addition of **glutathione** provides an antioxidant effect, protecting the corneal endothelium from oxidative stress and maintaining its metabolic function during prolonged irrigation. *Ringer lactate* - While **Ringer's lactate** is a balanced electrolyte solution, it lacks the specific components and buffering capacity present in specialized ophthalmic irrigating solutions. - It does not contain **glutathione** or other agents crucial for maintaining corneal endothelial viability and function during intraocular surgery. *Normal saline* - **Normal saline (0.9% NaCl)** lacks essential ions (calcium, magnesium, potassium) and appropriate pH buffering required for intraocular use. - Its use can lead to **corneal edema** and endothelial cell damage due to ionic imbalance and the absence of protective components found in balanced salt solutions. *Balanced salt solution* - A **plain balanced salt solution (BSS)** is a significant improvement over normal saline or Ringer's lactate as it is physiologically balanced for intraocular use, containing essential electrolytes. - However, it lacks the **antioxidant properties of glutathione**, which provides superior protection to corneal endothelial cells during extended surgical procedures.
Question 9: Floppy iris syndrome is associated with usage of
- A. 5 alpha reductase inhibitor
- B. PDE-5 inhibitor
- C. Anticholinergics
- D. Selective alpha-adrenergic antagonist (Correct Answer)
Explanation: ***Selective alpha-adrenergic antagonist*** - **Intraoperative Floppy Iris Syndrome (IFIS)** is classically associated with the use of **alpha-1 adrenergic antagonists**, particularly **tamsulosin**. - These drugs cause **flaccidity of the iris** and **prolapse through the incision** during **cataract surgery** by blocking **alpha-1 receptors** in the iris dilator muscle. *5 alpha reductase inhibitor* - These drugs, such as **finasteride** and **dutasteride**, inhibit the conversion of **testosterone to dihydrotestosterone (DHT)**. - They are used to treat **benign prostatic hyperplasia (BPH)** and **androgenetic alopecia** and have no known association with IFIS. *PDE-5 inhibitor* - **Phosphodiesterase-5 (PDE5) inhibitors** like **sildenafil** and **tadalafil** are used to treat **erectile dysfunction**. - While they can cause visual disturbances due to effects on retinal PDE6, they are **not associated with IFIS**. *Anticholinergics* - **Anticholinergic drugs** block the action of **acetylcholine** and are used for various conditions, including **overactive bladder** and **irritable bowel syndrome**. - They tend to cause **mydriasis (pupil dilation)**, but they do **not cause iris floppiness** or IFIS.
Question 10: All are manifestation of dengue virus infection in eye except?
- A. Cataract (Correct Answer)
- B. Vitreous hemorrhage
- C. Maculopathy
- D. Optic neuritis
Explanation: ***Cataract*** - **Cataracts** are primarily associated with aging, congenital factors, trauma, or long-term steroid use, not directly with acute dengue virus infection. - While dengue can cause various ocular manifestations, the formation of cataracts is a **chronic process** that does not fit the typical acute or subacute presentation of dengue-related eye complications. *Vitreous hemorrhage* - **Vitreous hemorrhage** can occur in dengue due to associated **thrombocytopenia** and coagulation abnormalities, leading to bleeding in the eye. - Severe dengue can induce systemic vasculopathy and bleeding tendencies, which may manifest as intraocular hemorrhage. *Maculopathy* - **Dengue maculopathy** is a recognized complication, often presenting as macular edema, hemorrhage, or foveolitis, leading to visual impairment. - This is thought to be due to direct viral effects, immune-mediated responses, or vasculitis affecting the retinal microvasculature. *Optic neuritis* - **Optic neuritis** following dengue infection has been reported, characterized by inflammation of the optic nerve, causing acute vision loss. - This is considered to be an **immune-mediated post-infectious complication** rather than a direct viral cytopathic effect on the nerve.
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