Pediatric Ophthalmology and Strabismus Practice Questions

Q: Esotropia is most commonly associated with:

Hyperopia. ***Hyperopia*** - **Hyperopia** (farsightedness) requires greater accommodative effort to focus on distant and near objects, which is coupled with **convergence**. This excessive convergence can lead to **esotropia** (inward turning of the eye). - Accommodative esotropia is a common type of strabismus directly linked to uncorrected hyperopia. *Presbyopia* - **Presbyopia** is an age-related loss of the eye's ability to focus on nearby objects due to stiffening of the lens, typically occurring after age 40. - It affects accommodation but does not primarily cause esotropia; rather, it makes near work difficult, and patients may prefer to hold objects further away to see them. *Astigmatism* - **Astigmatism** is a refractive error where the eye does not focus light evenly onto the retina due to an irregularly shaped cornea or lens, leading to blurred or distorted vision at all distances. - While it can cause visual discomfort and eye strain, it is not directly associated with the development of esotropia. *Myopia* - **Myopia** (nearsightedness) is a refractive error where distant objects appear blurry because light focuses in front of the retina. - High myopia can sometimes be associated with **exotropia** (outward turning of the eye) due to divergence excess, rather than esotropia.

Q: Which muscle acts as the yoke muscle for the right lateral rectus?

Lt medial rectus. ***Lt medial rectus*** - The **yoke muscles** are a pair of muscles, one in each eye, that act together to produce a conjugate eye movement in a particular direction. [1] - When the **right lateral rectus** abducts the right eye, the **left medial rectus** adducts the left eye simultaneously, allowing both eyes to move to the right in a coordinated fashion. [1] *Lt superior rectus* - The **left superior rectus** is primarily involved in **elevation** and **intorsion** of the left eye. [1] - Its action does not directly coordinate with the abduction of the right eye by the right lateral rectus for horizontal gaze. *Lt lateral rectus* - The **left lateral rectus** abducts the left eye. [1] - It would be the yoke muscle for the **right medial rectus** if the eyes were moving to the left. [1] *Lt inferior oblique* - The **left inferior oblique** is primarily involved in **elevation** and **extorsion** of the left eye. [1] - It is not a primary muscle for horizontal gaze movements and does not function as a yoke muscle for the right lateral rectus.

Q: What is the MOST common cause of amblyopia?

Strabismus. ***Strabismus*** - **Strabismic amblyopia** is the **MOST common cause of amblyopia**, accounting for approximately **50% of cases**. - When the eyes are misaligned, the brain suppresses the image from the deviating eye to avoid **diplopia** (double vision). - The prolonged suppression during the critical period of visual development leads to poor visual acuity in the affected eye. - Early detection and treatment (occlusion therapy, correction of refractive errors, alignment surgery) are crucial. *Refractive errors* - **Refractive amblyopia**, particularly **anisometropia** (significant difference in refractive power between eyes), is the **second most common cause**. - The brain suppresses the blurry image from the eye with greater refractive error, leading to poor visual development. - **Bilateral high refractive errors** (isoametropic amblyopia) can also cause amblyopia, though less commonly than anisometropia. *Cataracts* - **Deprivation amblyopia** results from obstruction of the visual axis (congenital cataract, ptosis, corneal opacity). - This is a **less common but more severe** form of amblyopia requiring urgent treatment. - If untreated during the critical period, it can cause **irreversible vision loss**. *None of the options* - Incorrect, as strabismus is a well-established and the most common cause of amblyopia.

Q: Following an accident, a man developed a paralytic squint. Regarding paralytic squint, which of the following is TRUE?

Diplopia. ***Diplopia*** - **Diplopia**, or **double vision**, is a hallmark symptom of paralytic squint due to the misalignment of the visual axes, causing two images of a single object to be perceived. - The inability of the affected eye to move in coordination with the unaffected eye results in the perception of two distinct images. *Tunnel vision (loss of peripheral vision)* - **Tunnel vision** is a feature of conditions affecting the peripheral visual field, such as **glaucoma** or **retinitis pigmentosa**, not typically associated with paralytic squint. - Paralytic squint primarily affects the **alignment of the eyes** and **ocular motility**, not the visual field extent. *Vitreous hemorrhage (bleeding within the eye)* - **Vitreous hemorrhage** involves bleeding into the **vitreous humor**, leading to blurred vision or sudden vision loss, often due to **trauma**, **diabetic retinopathy**, or **retinal tears**. - It is a structural problem within the eye and is not a direct consequence or typical symptom of paralytic squint, which is a **neuromuscular condition** affecting eye movement. *Floaters (visual disturbances from vitreous humor)* - **Floaters** are small specks or strands that drift across the visual field, commonly caused by **vitreous degeneration** or **posterior vitreous detachment**, often benign. - While they can be a nuisance, floaters are not directly related to the **paralysis of extraocular muscles** characteristic of paralytic squint.

Q: Which of the following is a hallmark feature of Duane retraction syndrome?

Retraction of globe. ***Retraction of globe*** - **Globe retraction** upon attempted adduction and/or abduction is a classic sign due to co-contraction of the antagonistic rectus muscles. - This abnormal innervation causes the eye to pull back into the orbit and narrow the palpebral fissure. *Hyperopia* - **Hyperopia** (farsightedness) is a refractive error and not a primary diagnostic feature of Duane retraction syndrome. - While it can co-occur, it is not a hallmark of the syndrome's motor abnormalities. *Head tilt* - A **head tilt** can be adopted by patients with Duane syndrome to compensate for the limited eye movements and maintain binocular vision, but it is a compensatory mechanism, not a hallmark feature itself. - It's a secondary sign that helps manage the primary problem of ocular motility impairment. *None of the options* - This option is incorrect because **globe retraction** is indeed a hallmark feature of Duane retraction syndrome.

Q: A 10-year-old child presents with inward turning of the right eye, and examination shows limited abduction of the affected eye. What is the most likely diagnosis?

Paralytic squint. ***Paralytic squint*** - The key finding is an **inward turning of the right eye** (**esotropia**) combined with **limited abduction** of that eye, strongly suggesting paralysis or weakness of the **lateral rectus muscle**. - A paralytic squint is characterized by an **underacting extraocular muscle**, leading to a deviation that varies with the direction of gaze and often results in **diplopia** (double vision) and a compensatory head turn. *Concomitant strabismus* - In concomitant strabismus, the **degree of ocular deviation is constant** in all directions of gaze, and there is no limitation of eye movement. - It typically results from an **imbalance in the binocular visual system** rather than a muscle paralysis. *Exotropia* - **Exotropia** refers to an **outward turning of the eye**, which is the opposite of the inward turning (**esotropia**) described in the clinical presentation. - While it is a type of strabismus, its direction of deviation does not match the patient's symptoms. *Hypertropia* - **Hypertropia** is an **upward deviation of one eye**, meaning the affected eye is higher than the other. - This condition is also not consistent with the reported inward turning of the eye.

Question 1

Esotropia is most commonly associated with:

Accepted Answer

Hyperopia

Answer

Presbyopia

Answer

Astigmatism

Answer

Myopia

Question 2

Which muscle acts as the yoke muscle for the right lateral rectus?

Accepted Answer

Lt medial rectus

Answer

Lt superior rectus

Answer

Lt lateral rectus

Answer

Lt inferior oblique

Question 3

What is the MOST common cause of amblyopia?

Accepted Answer

Strabismus

Answer

Cataracts

Answer

Refractive errors

Answer

None of the options

Question 4

Following an accident, a man developed a paralytic squint. Regarding paralytic squint, which of the following is TRUE?

Accepted Answer

Diplopia

Answer

Tunnel vision

Answer

Vitreous hemorrhage

Answer

Floaters

Question 5

Which of the following is a hallmark feature of Duane retraction syndrome?

Accepted Answer

Retraction of globe

Answer

Hyperopia

Answer

Head tilt

Answer

None of the options

Question 6

A 10-year-old child presents with inward turning of the right eye, and examination shows limited abduction of the affected eye. What is the most likely diagnosis?

Accepted Answer

Paralytic squint

Answer

Concomitant strabismus

Answer

Exotropia

Answer

Hypertropia

Pediatric Ophthalmology and Strabismus — MCQs

Pediatric Ophthalmology and Strabismus — MCQs

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