Ophthalmic Surgery Practice Questions

Q: Which of the following structures remains completely intact and uninvolved during enucleation of the eye?

Eye lids. ***Eye lids*** - **Enucleation** involves the surgical removal of the entire eyeball, but the **eyelids** remain completely intact and uninvolved in the procedure. - The eyelids are crucial for protecting the orbit and facilitating the fitting of a **prosthesis**. - Unlike other orbital structures that may be manipulated or detached, the eyelids are completely preserved. *Iris* - The **iris** is an internal structure of the eye, forming part of the uveal tract (iris, ciliary body, choroid). - Since enucleation is the surgical removal of the **entire globe**, the iris is necessarily removed with the rest of the eyeball. *Sclera* - The **sclera** is the tough, fibrous outer white layer of the eyeball. - As enucleation is the removal of the **entire eyeball**, the sclera is removed along with all other ocular components. *Extraocular muscles* - While the **extraocular muscles** are preserved in the orbit and not removed during enucleation, they are **detached from the globe** during the procedure. - Their stumps are preserved and may be attached to an orbital implant to improve the **motility of a prosthetic eye**. - However, they are surgically manipulated (cut from their insertion points), unlike the eyelids which remain completely untouched.

Q: In which of the following conditions does IOL implantation after cataract surgery require the greatest caution and specialized management?

Juvenile rheumatoid arthritis. ***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.

Q: How many mm from the limbus is the safest site of intravitreal injection?

3-4mm. ***3-4mm*** - This distance represents the **standard and safest site** for intravitreal injections in most clinical scenarios. - In **phakic eyes** (with natural lens), the injection is typically given at **3.5-4mm** from the limbus to avoid lens injury. - In **pseudophakic eyes** (with IOL), the injection is given at **3.5-4mm** from the limbus. - This distance ensures the needle tip enters the **vitreous cavity** without damaging the lens, ciliary body, or retina. - It provides safe access **anterior to the ora serrata** while maintaining adequate distance from anterior structures. *4-5mm* - This distance is **too posterior** and may place the injection site too close to or posterior to the **ora serrata** (which lies approximately 5.5-6mm from the limbus). - Injecting too posteriorly increases the risk of **retinal trauma**, **retinal detachment**, and **subretinal injection**. - Not the standard recommended distance in current ophthalmology practice guidelines. *1-2mm* - This distance is far too close to the **limbus** and would result in injection into the **anterior chamber** or **ciliary body** rather than the vitreous cavity. - Extremely high risk of **lens injury**, **hemorrhage from ciliary body vessels**, and **angle damage**. - Would not achieve proper **intravitreal drug delivery**. *2-3mm* - This distance is still **too anterior** in phakic eyes and carries significant risk of **crystalline lens injury** leading to iatrogenic cataract. - In pseudophakic eyes, while closer to acceptable range, 3-4mm provides better safety margin. - Higher risk of **ciliary body trauma** and **anterior chamber penetration**.

Q: Which of the following is not an indication for evisceration?

Malignancy. ***Malignancy*** - **Malignancy** is a direct contraindication for evisceration because removing only the intraocular contents risks leaving behind **cancerous tissue** in the scleral shell. - For suspected or confirmed intraocular malignancies like **retinoblastoma** or **choroidal melanoma**, **enucleation** (removal of the entire globe) is necessary to ensure complete tumor excision and prevent metastatic spread. *Severe globe trauma* - **Severe globe trauma**, especially with ruptured globe and extensive tissue loss, is a common indication for **evisceration** to relieve pain and prepare for a prosthetic eye. - In such cases, the damaged intraocular contents are removed while preserving the scleral shell, which can provide a good cosmetic and functional outcome. *Panophthalmitis* - **Panophthalmitis** refers to a severe infection involving all layers of the eye and surrounding orbital tissues, making evisceration an appropriate treatment. - Evisceration helps to **remove infected tissue**, control the spread of infection, alleviate pain, and prevent systemic complications. *Expulsive hemorrhage* - An **expulsive hemorrhage** is a catastrophic event involving massive choroidal bleeding that extrudes intraocular contents, often requiring emergent evisceration. - Evisceration in this context aims to **control bleeding**, alleviate severe pain, and remove non-viable tissue.

Q: YAG laser is used in the treatment of:

After cataract. ***After cataract*** - YAG laser is primarily used for **posterior capsulotomy** to treat **"after cataract"** or **posterior capsule opacification (PCO)**, a common complication following cataract surgery. - This procedure creates an opening in the opacified posterior capsule to restore clear vision without requiring a surgical incision. *Open-angle glaucoma* - YAG lasers are sometimes used in **peripheral iridotomy** for narrow-angle or **angle-closure glaucoma**, but not typically for the primary treatment of open-angle glaucoma, which is managed with medications or other laser procedures (e.g., SLT). - While YAG laser can be used for **iridotomy** in specific glaucoma types, it is generally not the go-to treatment for improving outflow in **open-angle glaucoma**. *Retinal detachment* - Retinal detachment is a surgical emergency typically treated with procedures like **vitrectomy**, **scleral buckle**, or **pneumatic retinopexy**. - Lasers used for retinal issues are often **argon lasers** for creating chorioretinal adhesions to prevent or wall off detachments, not YAG lasers for the detachment itself. *Diabetic retinopathy* - **Diabetic retinopathy** is primarily treated with **argon laser photocoagulation** (panretinal photocoagulation or focal laser) to destroy abnormal blood vessels and reduce macular edema. - YAG lasers are not used for the direct treatment of **diabetic retinopathy** or its associated neovascularization.

Q: The primary indication for enucleation is:

Retinoblastoma. ***Retinoblastoma*** - **Retinoblastoma** is the most common intraocular malignancy in children and the **primary indication for enucleation** in ophthalmology - Enucleation is indicated in advanced cases (Group D/E) where the eye cannot be salvaged, to prevent metastasis and save life - Given its aggressive nature and potential for life-threatening spread, **enucleation** remains the definitive curative treatment for advanced retinoblastoma *Malignant melanoma* - While intraocular melanoma can require enucleation, it is not the primary indication - Smaller tumors are often managed with globe-preserving treatments like **brachytherapy** or **proton beam radiation** - Enucleation is reserved for large melanomas, treatment failures, or eyes with severe pain and no vision *Glaucoma* - **Glaucoma** is primarily managed with medications, laser therapy, or filtering surgeries to lower intraocular pressure - Enucleation for glaucoma is exceedingly rare, considered only for intractable pain in a blind eye when all other treatments have failed *Phthisis bulbi* - **Phthisis bulbi** is a shrunken, non-functional eye resulting from severe trauma, inflammation, or disease - Enucleation may be performed for cosmetic reasons or pain relief, but this is a secondary indication - It represents end-stage ocular damage, not a primary life-saving indication like retinoblastoma

Q: What is the most important absolute indication for ophthalmic enucleation?

Intraocular retinoblastoma. ***Intraocular retinoblastoma*** - **Intraocular malignancy**, particularly unilateral retinoblastoma, is the most important absolute indication for enucleation as it is life-threatening. - Enucleation is performed to prevent **metastasis** and save the patient's life, as retinoblastoma can be fatal if not treated aggressively. - Other intraocular malignancies like **choroidal melanoma** may also require enucleation. *Absolute glaucoma* - Absolute glaucoma (painful blind eye) is also an absolute indication for enucleation when the eye is blind, painful, and medical management has failed. - However, it is less critical than intraocular malignancy as it doesn't pose a life-threatening risk. - Enucleation relieves pain and prevents the risk of **sympathetic ophthalmia**, though other palliative procedures like **cyclodestructive procedures** may be tried first. *Mutilating ocular injury* - Severe ocular trauma is a relative indication, not an absolute one. Initial management focuses on **repair and salvage** of the globe. - Enucleation is considered only if there's no potential for vision recovery, severe pain, or significant risk of **sympathetic ophthalmia** in the fellow eye. - Primary enucleation after trauma is rarely performed immediately. *Endophthalmitis* - Endophthalmitis is a severe intraocular infection, but enucleation is typically a last resort after medical management fails. - Initial treatment involves **intravitreal antibiotics** and possibly **vitrectomy** to eradicate the infection. - Enucleation is only considered if the infection is uncontrolled, leading to a blind and painful eye, or if there's risk of **orbital extension** or panophthalmitis.

Q: Uncontrolled hypertension may cause which of the following complications in cataract surgery:

Suprachoroidal hemorrhage. ***Suprachoroidal hemorrhage*** - **Uncontrolled hypertension** significantly increases the risk of **suprachoroidal hemorrhage** during cataract surgery due to fragile blood vessels and elevated intraoperative blood pressure. - This complication can lead to acute, severe pain, vision loss, and globe rupture, often requiring immediate surgical intervention. *Retinal detachment* - While a serious complication of ocular surgery, **retinal detachment** is not directly caused by uncontrolled hypertension during cataract surgery. - It is more commonly associated with posterior capsular rupture, vitreous loss, or high myopia. *Glaucoma* - **Glaucoma** is a chronic condition characterized by optic nerve damage, often due to elevated intraocular pressure, and is not an acute complication of uncontrolled hypertension during cataract surgery. - While hypertension is a risk factor for certain types of glaucoma, it does not directly cause an acute glaucomatous event during the procedure. *Endophthalmitis* - **Endophthalmitis** is a severe infection of the intraocular fluids and tissues, typically occurring post-operatively. - It is primarily caused by bacterial or fungal contamination during or after surgery and is not directly linked to uncontrolled hypertension.

Q: Enucleation is done for - a) Retinoblastoma b) Malignant melanoma c) Glaucoma d) Phthisis bulbi

abd. ***abd*** - **Enucleation** (surgical removal of the entire eyeball) is indicated for **retinoblastoma** and **malignant melanoma** due to the malignant nature of these conditions and the risk of metastasis. - It is also performed in cases of severe **phthisis bulbi**, where the eye is shrunken, non-functional, and often painful, to alleviate symptoms and for cosmetic reasons. *abc* - This option incorrectly includes **glaucoma** as a primary indication for enucleation. - While severe, painful, and blind glaucomatous eyes might eventually undergo enucleation, it is not the initial or typical treatment; many other medical and surgical options are explored first. *acd* - This option incorrectly includes **glaucoma** for the aforementioned reasons and omits **malignant melanoma**. - **Malignant melanoma** of the choroid is a significant indication for enucleation, especially in larger tumors, due to its metastatic potential. *bcd* - This option incorrectly includes **glaucoma** and omits **retinoblastoma**. - **Retinoblastoma** is a life-threatening pediatric malignancy, and prompt enucleation is often crucial for treatment and survival.

Question 1

Which of the following structures remains completely intact and uninvolved during enucleation of the eye?

Accepted Answer

Eye lids

Answer

Iris

Answer

Sclera

Answer

Extraocular muscles

Question 2

In which of the following conditions does IOL implantation after cataract surgery require the greatest caution and specialized management?

Accepted Answer

Juvenile rheumatoid arthritis

Answer

Fuchs' heterochromic iridocyclitis

Answer

Psoriatic arthritis

Answer

Reiter's syndrome

Question 3

How many mm from the limbus is the safest site of intravitreal injection?

Accepted Answer

3-4mm

Answer

4-5mm

Answer

1-2mm

Answer

2-3mm

Question 4

Which of the following is not an indication for evisceration?

Accepted Answer

Malignancy

Answer

Severe globe trauma

Answer

Panophthalmitis

Answer

Expulsive hemorrhage

Question 5

YAG laser is used in the treatment of:

Accepted Answer

After cataract

Answer

Open-angle glaucoma

Answer

Retinal detachment

Answer

Diabetic retinopathy

Question 6

The primary indication for enucleation is:

Accepted Answer

Retinoblastoma

Answer

Malignant melanoma

Answer

Glaucoma

Answer

Phthisis bulbi

Question 7

What is the most important absolute indication for ophthalmic enucleation?

Accepted Answer

Intraocular retinoblastoma

Answer

Absolute glaucoma

Answer

Mutilating ocular injury

Answer

Endophthalmitis

Question 8

Uncontrolled hypertension may cause which of the following complications in cataract surgery:

Accepted Answer

Suprachoroidal hemorrhage

Answer

Retinal detachment

Answer

Glaucoma

Answer

Endophthalmitis

Question 9

Enucleation is done for - a) Retinoblastoma b) Malignant melanoma c) Glaucoma d) Phthisis bulbi

Accepted Answer

abd

Answer

abc

Answer

acd

Answer

bcd

Answer

ab

Question 10

What are the differences between phacoemulsification and extracapsular cataract extraction (ECCE) regarding recovery time and astigmatism risk?

Accepted Answer

Phacoemulsification has faster recovery and less risk of astigmatism.

Answer

Phacoemulsification typically results in less astigmatism.

Answer

ECCE has faster recovery but higher astigmatism risk.

Answer

Both techniques have similar recovery times and astigmatism risks.

Ophthalmic Surgery — MCQs

Ophthalmic Surgery — MCQs

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