Pediatric Ophthalmology and Strabismus Practice Questions

Q: Onset of stereopsis occurs at the age of:

3 to 5 months. ***3 to 5 months*** - **Stereopsis**, or **binocular depth perception**, typically develops between **3 to 5 months of age** as the visual system matures and the brain learns to fuse images from both eyes. - This developmental window is crucial for the establishment of normal **depth perception** and is actively assessed during infant visual screenings. *1 to 2 years* - While visual development continues beyond infancy, the **onset of stereopsis** occurs earlier, in the first few months of life, not between 1 to 2 years. - At 1 to 2 years, children are further refining their **hand-eye coordination** and **visual-motor skills**, building upon established **depth perception**. *5 years* - By **5 years of age**, a child's visual system, including stereopsis, should be fully developed, and any significant deficits in **depth perception** at this stage would indicate a developmental problem. - This age represents a mature stage of visual function, not the **initial onset** of stereopsis. *7 years* - At **7 years of age**, the visual system is considered fully mature, and any significant issues with **stereopsis** would likely indicate a long-standing, uncorrected visual impairment that developed much earlier. - The critical period for the development of stereopsis has long passed by this age.

Q: Crossed eye fixation is positive in -

Esotropia. ***Esotropia*** - **Crossed eye fixation** is a characteristic sign observed in infants with **infantile esotropia**, where one or both eyes are turned inward. - In this phenomenon, the infant uses the **adducted (turned-in) eye** to fixate on objects in the **temporal visual field** of that eye, rather than using the normally positioned fellow eye. - This represents an **abnormal fixation pattern** where the child "crosses fixation" by using the esotropic eye to view objects that would normally be seen by the other eye. - This is a compensatory mechanism and a clinically important sign in **pediatric strabismus evaluation**. *Exotropia* - **Exotropia** involves an outward deviation of one or both eyes (divergent strabismus). - Crossed eye fixation is **not characteristic** of exotropia; this condition shows different fixation patterns. *Hypertropia* - **Hypertropia** is an upward vertical deviation of one eye relative to the other. - Crossed eye fixation is a **horizontal fixation phenomenon** and does not manifest in vertical deviations. *Hypotropia* - **Hypotropia** is a downward vertical deviation of one eye relative to the other. - This vertical misalignment does not present with the specific finding of crossed eye fixation.

Q: Which of the following statements about divergent squint is true?

It is also known as exotropia.. ***It is also known as exotropia.*** - **Divergent squint** refers to the outward deviation of one eye, which is medically termed **exotropia**. - This condition is characterized by the eyes turning away from each other. *It is associated with 6th nerve palsy.* - **6th nerve (abducens) palsy** primarily causes **esotropia** (convergent squint), as it impairs the lateral rectus muscle responsible for outward eye movement. - Patients with 6th nerve palsy would have difficulty moving the affected eye outwards, leading to it turning inwards. *It is more common in adults than children.* - **Exotropia** (divergent squint) is actually **more prevalent in children** than in adults, especially the intermittent form. - While it can persist into adulthood, its onset is most commonly observed during childhood. *It is the most common type of squint in children.* - **Exotropia** is common, but **esotropia** (convergent squint) is generally considered the **most common type of squint in children**, particularly accommodative esotropia. - Esotropia involves the inward deviation of one or both eyes.

Q: Which ocular manifestation is considered a hallmark feature of Goldenhar syndrome?

Epibulbar dermoids. ***Epibulbar dermoids*** - **Epibulbar dermoids** are benign congenital tumors that appear as yellow-white masses, typically at the **limbus** (junction of the cornea and sclera), and are the most characteristic ocular finding in **Goldenhar syndrome**. - These dermoids can interfere with vision if they extend over the cornea or induce astigmatism. *Microphthalmia* - **Microphthalmia** refers to a condition where the eye is abnormally small, which can be seen in various congenital syndromes but is not a hallmark or exclusive feature of Goldenhar syndrome. - While it can occur in Goldenhar syndrome, it is less specific than epibulbar dermoids for diagnosis. *Sclerocornea* - **Sclerocornea** is a congenital anomaly where the cornea becomes opaque and resembles the sclera, often described as a "white cornea" or opacification of the cornea. - This condition is not a primary or hallmark feature of Goldenhar syndrome, though it can be part of other complex ocular developmental anomalies. *Megalocornea* - **Megalocornea** is an inherited condition characterized by an abnormally large corneal diameter, typically greater than 13 mm in adults. - While it can be an isolated finding or associated with other genetic conditions, it is not considered a defining ocular manifestation of Goldenhar syndrome.

Q: In the context of ophthalmology, what does the acronym BSGT refer to?

Bagolini striated glasses test. ***Bagolini striated glasses test*** - The acronym **BSGT** specifically refers to the **Bagolini striated glasses test**, which is a method used in ophthalmology and optometry to evaluate a patient's binocular vision and determine the presence and type of **diplopia** or **suppression**. - This test uses special lenses with fine, parallel striations that cause a point source of light to appear as a streak, helping to assess the patient's **correspondence** and **fusion abilities**. *Bagolini smooth glasses test* - The term **"smooth glasses test"** is not a recognized or standard test in optometry. - The distinctive feature of Bagolini lenses is their **striations**, which are critical for the test's function. *Bagolini shiny glasses test* - The term **"shiny glasses test"** is not a recognized or standard test in optometry. - The appearance of the glasses as **"shiny"** does not convey the functional aspect of the test's striations. *Bagolini stereoscopic glasses test* - While the Bagolini test assesses aspects of binocular vision and can indirectly relate to **stereopsis**, it is not primarily called a **"stereoscopic glasses test."** - **Stereoscopic tests** typically use polarized or red-green anaglyph lenses to directly evaluate depth perception, which is distinct from the primary goal of the Bagolini test.

Q: Which muscle paralysis causes right esotropia?

Right lateral rectus paralysis. ***Right lateral rectus paralysis*** - **Esotropia** is an inward deviation of the eye. A paralyzed **right lateral rectus muscle** would prevent the right eye from abducting (moving outward), causing it to turn inward. - The **lateral rectus muscle** is responsible for abducting the eye, and its paralysis would result in an unopposed pull by the medial rectus, leading to esotropia. *Left medial rectus paralysis* - Paralysis of the **left medial rectus** would prevent the left eye from adducting (moving inward), resulting in an **exotropia** (outward deviation) of the left eye, not right esotropia. - The **medial rectus muscle** adducts the eye, and if paralyzed, the eye would drift outward. *Right medial rectus paralysis* - Paralysis of the **right medial rectus** would prevent the right eye from adducting, leading to an **exotropia** (outward deviation) of the right eye, not an esotropia. - This muscle is responsible for moving the eye inward, and its dysfunction would cause the eye to deviate outwards. *Left lateral rectus paralysis* - Paralysis of the **left lateral rectus** would cause the left eye to deviate inward (left esotropia), as the eye would be unable to abduct. - This condition affects the left eye, not the right eye as indicated in the question.

Q: Esotropia is common in

Hypermetropia. ***Hypermetropia*** - **Esotropia**, or inward turning of the eye, is common in **hypermetropia** (farsightedness) due to the accommodative effort required to focus. - In hypermetropia, **excessive accommodation** is needed to see clearly at all distances, especially for **near vision**. - This constant **accommodative effort** stimulates convergence through the **accommodation-convergence reflex**, predisposing to **accommodative esotropia**, particularly in children. *Myopia* - **Myopia** (nearsightedness) is typically associated with **exotropia** (outward turning of the eye). - This is because myopic individuals exert less accommodative effort for near vision, reducing the stimulus for convergence and potentially leading to divergence of the eyes. *Emmetropia* - **Emmetropia** describes an eye with **no refractive error**, where light focuses perfectly on the retina without accommodation for distance. - Individuals with emmetropia generally have **orthophoria** (proper alignment of the eyes) and are less prone to strabismus like esotropia unless an underlying muscle imbalance is present. *Astigmatism* - **Astigmatism** is an optical defect in which the eye does not focus light evenly onto the retina, causing blurred vision at any distance. - While it can be associated with other refractive errors, **astigmatism itself is not directly or commonly associated with esotropia**.

Q: Identify the ophthalmic instrument used for measuring heterophoria and heterotropia.

Maddox rod. ***Maddox rod*** - The Maddox rod is a glass rod with a series of parallel, high-plus cylinders that convert a point source of light into a **streak or line of light**. - It is used to **dissociate the eyes** and measure the amount of heterophoria (latent deviation) or heterotropia (manifest deviation). *Maddox wing* - The Maddox wing is an instrument with various prisms and scales, primarily used for **measuring horizontal and vertical phorias at near** (e.g., 33 cm). - Unlike the Maddox rod, it does not rely on converting a point source into a line of light but instead uses different targets for each eye. *Maddox glass* - "Maddox glass" is not a standard or recognized ophthalmic instrument. The correct term for the instrument described is a **Maddox rod**. - It is likely a misinterpretation of the instrument's name or a colloquial, non-technical term. *Red glasses* - **Red glasses** are often used for **color perception testing**, or as a filter in specific visual field tests or neurological assessments, but not for direct measurement of heterophoria or heterotropia. - While a red filter can be incorporated into a Maddox rod for increased dissociation and visibility (as seen in the image), "red glasses" alone refers to a different application.

Q: A 65-year-old male with a history of hypertension and diabetes presents to the OPD with complaints of diplopia and squint. On examination, the secondary deviation is more than the primary deviation. Which of the following is the most likely diagnosis?

paralytic squint. ***Paralytic squint*** The key finding of **secondary deviation being greater than primary deviation** is a classic sign of **paralytic strabismus**. This occurs because the paretic eye (due to neurological deficit) has to work harder to fixate, leading to an exaggerated innervation to the yoked muscle in the healthy eye, causing a larger deviation (Hering's law of equal innervation). The patient's age and history of **hypertension and diabetes** increase the risk of **cranial nerve palsies** (e.g., oculomotor, trochlear, abducens), which are common causes of paralytic squint due to microvascular ischemia. *Concomitant strabismus* In **concomitant strabismus**, the degree of deviation remains constant in all directions of gaze, meaning **primary and secondary deviations are equal**. This contradicts the clinical finding in the patient. Concomitant strabismus often presents in childhood and is typically non-paralytic, with no underlying neurological deficit affecting muscle action. *Restrictive strabismus* **Restrictive strabismus** is characterized by physical limitation of eye movement due to mechanical restriction of an extraocular muscle, often seen in conditions like **thyroid eye disease** or **orbital trauma**. While restrictive strabismus can cause diplopia and reduced eye movement, it typically involves a **limited range of motion** and usually does not present with secondary deviation being greater than primary deviation in the same manner as a paralytic squint. *Pseudo strabismus* **Pseudo strabismus** is an apparent misalignment of the eyes where the eyes are actually straight. This can be due to features like a **wide epicanthal fold** or a **small interpupillary distance**. In pseudo strabismus, there is **no true deviation** on cover-uncover testing, and therefore, the concepts of primary and secondary deviation do not apply, nor would there be actual diplopia.

Question 1

Onset of stereopsis occurs at the age of:

Accepted Answer

3 to 5 months

Answer

1 to 2 years

Answer

5 years

Answer

7 years

Question 2

Crossed eye fixation is positive in -

Accepted Answer

Esotropia

Answer

Exotropia

Answer

Hypertropia

Answer

Hypotropia

Question 3

Which of the following statements about the treatment of cataract in children is false?

Accepted Answer

Lensectomy is not one of the methods of extracapsular extraction

Answer

Intraocular lens implantation can be performed after 2 years of age.

Answer

ECCE is the treatment of choice

Answer

In case of bilateral cataract impairing vision, surgery must be done by 4-6 weeks of age.

Question 4

Which of the following statements about divergent squint is true?

Accepted Answer

It is also known as exotropia.

Answer

It is more common in adults than children.

Answer

It is associated with 6th nerve palsy.

Answer

It is the most common type of squint in children.

Question 5

Which ocular manifestation is considered a hallmark feature of Goldenhar syndrome?

Accepted Answer

Epibulbar dermoids

Answer

Microphthalmia

Answer

Sclerocornea

Answer

Megalocornea

Question 6

In the context of ophthalmology, what does the acronym BSGT refer to?

Accepted Answer

Bagolini striated glasses test

Answer

Bagolini smooth glasses test

Answer

Bagolini shiny glasses test

Answer

Bagolini stereoscopic glasses test

Question 7

Which muscle paralysis causes right esotropia?

Accepted Answer

Right lateral rectus paralysis

Answer

Left medial rectus paralysis

Answer

Right medial rectus paralysis

Answer

Left lateral rectus paralysis

Question 8

Esotropia is common in

Accepted Answer

Hypermetropia

Answer

Myopia

Answer

Emmetropia

Answer

Astigmatism

Question 9

Identify the ophthalmic instrument used for measuring heterophoria and heterotropia.

Accepted Answer

Maddox rod

Answer

Maddox wing

Answer

Maddox glass

Answer

Red glasses

Question 10

A 65-year-old male with a history of hypertension and diabetes presents to the OPD with complaints of diplopia and squint. On examination, the secondary deviation is more than the primary deviation. Which of the following is the most likely diagnosis?

Accepted Answer

paralytic squint

Answer

concomitant strabismus

Answer

restrictive strabismus

Answer

pseudo strabismus

Pediatric Ophthalmology and Strabismus — MCQs

Pediatric Ophthalmology and Strabismus — MCQs

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