Oculoplasty Practice Questions

Q: A 24-year-old girl with a history of head trauma presented with multiple lacerations on the face and eyelids and a base of skull fracture. It was noticed she wasn't able to pass tears. The probable cause is injury to-

Inferior Canaliculus. ***Inferior Canaliculus*** - The **inferior canaliculus** is a common site of injury given its anatomical position and the common mechanisms of trauma to the eyelids. Obstruction or laceration of this structure can prevent tears from draining into the nasolacrimal sac, leading to **epiphora** (overflowing tears). - Given the patient's **multiple lacerations on the eyelids** and inability to pass tears, injury to the drainage system, specifically the inferior canaliculus, is the most probable cause. *Lacrimal Gland* - The **lacrimal gland** is responsible for producing tears. An injury to the lacrimal gland would typically result in a **decrease in tear production**, rather than an inability to pass existing tears. - While head trauma can affect the lacrimal gland, the symptom of "not able to pass tears" specifically points to a problem with the **tear drainage system**. *Superior Canaliculus* - The **superior canaliculus** also plays a role in tear drainage, but it contributes less significantly than the inferior canaliculus, especially in maintaining basal tear drainage. - While injury to the superior canaliculus can impair tear drainage, the **inferior canaliculus** is typically the primary route and its obstruction would more readily result in noticeable issues with tear passage. *Upper eyelid* - Lacerations to the **upper eyelid** itself, without affecting the lacrimal drainage structures, would primarily cause cosmetic deformities, swelling, or visual obstruction. - An isolated injury to the upper eyelid generally would not prevent the passage of tears unless it directly involved the lacrimal gland's ducts (unlikely) or caused severe swelling that secondarily obstructed the drainage system.

Q: A middle-aged female is having essential blepharospasm and is planned to be treated with botulinum toxin. Which of the following statements is not true regarding the treatment?

Response rate is over 95%. ***Response rate is over 95%*** - While botulinum toxin is highly effective for **essential blepharospasm**, the response rate typically ranges from **70-90%**, not over 95%. - A response rate this high is optimistic and not universally observed in clinical practice. *Need repeat injections* - **Botulinum toxin** effects are temporary, usually lasting for **3 to 4 months**, necessitating repeat injections for sustained relief. - The medication works by temporarily **paralyzing the orbicularis oculi muscle**, and as its effect wears off, symptoms recur. *Diplopia may occur* - **Diplopia** (double vision) can occur as a side effect if the toxin spreads to affect adjacent extraocular muscles, particularly the **superior rectus muscle**. - This is a known, though generally uncommon, complication of injections around the eye. *Botulinum toxin type A is the most effective treatment.* - **Botulinum toxin type A** (e.g., Botox, Xeomin, Dysport) is considered the **first-line and most effective treatment** for essential blepharospasm. - It works by blocking the release of **acetylcholine** at the neuromuscular junction, reducing involuntary muscle spasms.

Q: Stye is a suppurative inflammation of which gland?

Zeis. ***Zeis*** - A **stye (hordeolum externum)** is an acute suppurative inflammation of the **sebaceous glands of Zeis**, which are associated with the eyelash follicles at the eyelid margin. - This infection typically presents as a painful, red, swollen lump on the eyelid margin. - The **glands of Zeis are the most commonly affected** and are classically cited as the cause of external hordeolum. *Meibomian* - Inflammation of the **Meibomian glands** (which are modified sebaceous glands located within the tarsal plate) causes an **internal hordeolum** when acutely infected. - A **chalazion** is a chronic, non-tender, sterile granulomatous inflammation of the Meibomian gland, distinct from the acute infection of internal hordeolum. - Both conditions affect the deeper structures of the eyelid, not the eyelid margin like an external hordeolum. *Lacrimal* - The **lacrimal gland** produces tears and its inflammation is called **dacryoadenitis**. - Dacryoadenitis presents as swelling and pain in the **superotemporal aspect of the orbit**, not on the eyelid margin as with a stye. *Gland of Moll* - The **glands of Moll** are modified apocrine sweat glands located near the eyelash follicles at the eyelid margin. - While infections of Moll's glands can also present as external hordeolum clinically, the **classical definition of a stye specifically refers to infection of the sebaceous glands of Zeis**. - In practice, both Zeis and Moll gland infections present identically and are managed the same way.

Q: In congenital ptosis, surgery should be performed at the earliest to prevent amblyopia. Which of the following operations is not typically used for the correction of congenital ptosis?

Modified Burrow's operation. ***Modified Burrow's operation*** - The **Modified Burrow's operation** is primarily used in oculoplastic surgery for the correction of **entropion** or **ectropion**, and to resect redundant skin and muscle, not for ptosis correction. - It involves removing a strip of skin and orbicularis muscle, which does not address the underlying levator muscle weakness or disinsertion typical of congenital ptosis. *Blaskowics' operation* - This procedure involves an **anterior approach** to resect and advance the **levator aponeurosis** and Müller's muscle. - It is used for **mild to moderate congenital ptosis** with residual levator function (levator function >4-5 mm). *Everbusch's operation* - An **external approach** to resect the **levator muscle** or aponeurosis to elevate the eyelid. - It is used for **moderate congenital ptosis** where there is some residual levator function. *Frontalis sling operation* - This is a **suspension procedure** that connects the eyelid to the **frontalis muscle** using autogenous fascia lata, silicone rod, or other materials. - It is the procedure of choice for **severe congenital ptosis with poor levator function** (<4 mm), allowing the patient to use the frontalis muscle to elevate the eyelid.

Q: Distichiasis is a condition characterized by:

Abnormal extra row of cilia. ***Abnormal extra row of cilia*** - **Distichiasis** is a congenital or acquired condition characterized by the presence of a double row of eyelashes, where the extra row emerges from the **Meibomian gland orifices**. - These accessory eyelashes can be the same length as normal lashes or appear finer and shorter, often causing **ocular irritation**, corneal abrasion, and epiphora due to their abnormal growth direction. *Abnormal inversion of eyelashes* - This description typically refers to **trichiasis**, where normally positioned eyelashes grow inwards towards the eye. - While both can cause irritation, **trichiasis** involves misdirection of existing lashes, whereas distichiasis involves an *extra* row. *Abnormal eversion of eyelashes* - Eversion of eyelashes is not a recognized abnormality in this context; rather, **ectropion** refers to the outward turning of the eyelid margin, which may expose the eyelashes but is not a primary cilial abnormality. - This condition is more about eyelid positioning than the eyelashes themselves. *Misdirected cilia* - While distichiasis does involve cilia growing in an abnormal direction, the key feature of distichiasis is the presence of an *additional* row of lashes, not just misdirection of the primary row. - **Trichiasis** is the more appropriate term for misdirected cilia from the normal lash line.

Q: Which of the following statements about chalazion is false?

Vertical incision is used to remove the contents.. ***Vertical incision is used to remove the contents*** - This is marked as the FALSE statement, but this requires clarification. - In the **transconjunctival approach** (most common), a **vertical incision** is made perpendicular to the lid margin through the palpebral conjunctiva. - In the **external/skin approach**, a **horizontal incision** following the skin creases may be used. - The question likely intends to test that horizontal incisions are more commonly described in traditional teaching, though vertical transconjunctival incisions are actually the preferred modern approach. *Incision and curettage are performed* - **TRUE statement** - Incision and curettage is the standard surgical procedure for chalazion removal when conservative treatment fails. - The chalazion is incised and the granulomatous material is scraped out using a **curette**. *It is a granulomatous condition* - **TRUE statement** - Chalazion is a **chronic sterile granulomatous inflammation** of the meibomian gland. - Results from obstruction of the meibomian gland duct, leading to lipogranulomatous inflammation with **foreign body giant cells** and **epithelioid cells**. *Horizontal incision is made to remove the contents* - **TRUE statement** - Horizontal incision parallel to the lid margin can be used in the external/skin approach. - Follows natural skin creases to minimize scarring. - However, the **transconjunctival approach with vertical incision** is more commonly preferred as it avoids external scarring.

Question 1

A 24-year-old girl with a history of head trauma presented with multiple lacerations on the face and eyelids and a base of skull fracture. It was noticed she wasn't able to pass tears. The probable cause is injury to-

Accepted Answer

Inferior Canaliculus

Answer

Lacrimal Gland

Answer

Superior Canaliculus

Answer

Upper eyelid

Question 2

A middle-aged female is having essential blepharospasm and is planned to be treated with botulinum toxin. Which of the following statements is not true regarding the treatment?

Accepted Answer

Response rate is over 95%

Answer

Diplopia may occur

Answer

Botulinum toxin type A is the most effective treatment.

Answer

Need repeat injections

Question 3

Stye is a suppurative inflammation of which gland?

Accepted Answer

Zeis

Answer

Meibomian

Answer

Lacrimal

Answer

Gland of Moll

Question 4

In congenital ptosis, surgery should be performed at the earliest to prevent amblyopia. Which of the following operations is not typically used for the correction of congenital ptosis?

Accepted Answer

Modified Burrow's operation

Answer

Blaskowics' operation

Answer

Everbusch's operation

Answer

Frontalis sling operation

Question 5

Distichiasis is a condition characterized by:

Accepted Answer

Abnormal extra row of cilia

Answer

Abnormal inversion of eyelashes

Answer

Abnormal eversion of eyelashes

Answer

Misdirected cilia

Question 6

Which of the following statements about chalazion is false?

Accepted Answer

Vertical incision is used to remove the contents.

Answer

Incision and curettage are performed.

Answer

It is a granulomatous condition.

Answer

Horizontal incision is made to remove the contents.

Oculoplasty — MCQs

Oculoplasty — MCQs

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