Pediatric Ophthalmology and Strabismus Practice Questions

Q: Persistent Primary Hyperplastic Vitreous (PHPV) is associated with which condition?

Patau syndrome. **Explanation:** **Persistent Primary Hyperplastic Vitreous (PHPV)**, now more commonly termed **Persistent Fetal Vasculature (PFV)**, is a congenital anomaly resulting from the failure of the primary vitreous and hyaloid vascular system to regress during embryogenesis. **Why Patau Syndrome is Correct:** **Patau Syndrome (Trisomy 13)** is the chromosomal anomaly most strongly associated with PHPV. It is characterized by severe midline defects and ocular malformations. In these patients, PHPV often presents as a retrolental mass (leukocoria) in a microphthalmic eye. The association is a high-yield fact because Trisomy 13 is the most common systemic condition linked to bilateral cases of PHPV. **Analysis of Incorrect Options:** * **Edward Syndrome (Trisomy 18):** While it presents with systemic anomalies like clenched fists and rocker-bottom feet, its primary ocular associations are corneal opacities and congenital glaucoma, not typically PHPV. * **Trisomy 14:** This is a rare chromosomal disorder. While it can involve ocular features like microphthalmia, it is not classically associated with PHPV in medical literature or examinations. * **Down Syndrome (Trisomy 21):** Ocular hallmarks include Brushfield spots, epicanthal folds, keratoconus, and early-onset cataracts. PHPV is not a feature of Down syndrome. **Clinical Pearls for NEET-PG:** * **Laterality:** PHPV is typically **unilateral** (90% of cases). If it is **bilateral**, always suspect **Patau Syndrome**. * **Clinical Triad:** Microphthalmos, Leukocoria (white pupillary reflex), and elongated ciliary processes. * **Differential Diagnosis:** PHPV is a major differential for Retinoblastoma. Unlike Retinoblastoma, PHPV presents with a **smaller eye (microphthalmos)** and lacks calcification on ultrasound/CT. * **Complications:** Can lead to secondary angle-closure glaucoma due to the swelling of the lens or traction on the iris.

Q: Pseudoconvergent squint is seen with which of the following conditions?

Broad epicanthus. **Explanation:** **Pseudostrabismus (Apparent Squint)** is a clinical condition where the eyes appear misaligned (crossed or divergent) despite being orthophoric (perfectly aligned) on objective testing, such as the Hirschberg corneal reflex test and the cover-uncover test. **Why Broad Epicanthus is Correct:** **Pseudoconvergent squint (Pseudoesotropia)** is most commonly caused by a **broad epicanthal fold**. This is a vertical fold of skin extending from the upper eyelid to the side of the nose, covering the inner canthus. Because less of the nasal sclera (white of the eye) is visible, the eyes appear to be turned inward, especially when the child looks to either side. Other causes include a flat nasal bridge and a narrow interpupillary distance (IPD). **Analysis of Incorrect Options:** * **Thyrotoxicosis:** Typically associated with **Pseudoexophthalmos** (due to lid retraction) rather than a pseudoconvergent squint. * **Abducent Squint:** This refers to a 6th nerve palsy, which results in a **true esotropia** (convergent squint), not a pseudo-squint. * **Narrow Interpupillary Distance:** While a narrow IPD can cause pseudoesotropia, **Broad Epicanthus** is the classic and most frequent cause cited in exams. (Note: Option D is a potential cause, but B is the definitive clinical hallmark). **High-Yield Clinical Pearls for NEET-PG:** * **Pseudoesotropia:** Caused by broad epicanthus, flat nasal bridge, or narrow IPD. * **Pseudoexotropia:** Caused by a wide IPD (hypertelorism) or a large positive Angle Kappa. * **Diagnostic Test:** The **Hirschberg test** will show a central corneal light reflex in both eyes in cases of pseudo-squint, distinguishing it from true strabismus. * **Angle Kappa:** A large **negative** angle kappa can mimic esotropia; a large **positive** angle kappa (common in high hypermetropia) mimics exotropia.

Q: A patient has right lateral rectus palsy. Towards which side will his head be deviated?

Towards right. **Explanation:** In paralytic strabismus, a patient adopts a compensatory head posture to minimize **diplopia** (double vision) and maintain binocular single vision. The fundamental principle is that the **face turns in the direction of the action of the paralyzed muscle.** 1. **Why Option A is Correct:** The Right Lateral Rectus (RLR) is an abductor; its primary action is to move the right eye outward (towards the right). In RLR palsy, the eye deviates inward (esotropia) due to the unopposed action of the medial rectus. To compensate, the patient turns their **face towards the right**. This rotation of the head shifts the object of interest into the "field of comfort" (the left hemifield relative to the right eye), where the paralyzed muscle is not required to act, thereby neutralizing the diplopia. 2. **Why Other Options are Incorrect:** * **Option B (Towards Left):** Turning the head to the left would require the right eye to abduct further to maintain fixation, which would significantly worsen the diplopia and the deviation. * **Options C & D (Upwards/Downwards):** Vertical head tilts are characteristic of vertical muscle palsies (e.g., Superior Oblique or Superior Rectus) or A/V patterns, not isolated horizontal rectus palsies. **Clinical Pearls for NEET-PG:** * **Rule of Thumb:** The face always turns towards the **direction of the paralyzed muscle's action**. * **Diplopia:** In LR palsy, the diplopia is **uncrossed (homonymous)** and is maximal on attempted abduction of the affected eye. * **Nerve Involved:** LR is supplied by the **6th Cranial Nerve (Abducens)**. * **Differential:** In Superior Oblique (4th Nerve) palsy, the patient presents with a **head tilt to the opposite shoulder** (Bielschowsky's test) to compensate for the loss of intorsion.

Q: In 'A'-esotropia, how does the amount of deviation change with vertical gaze?

Increases in upward gaze and decreases in downward gaze. **Explanation:** In pediatric ophthalmology, **Alphabet Patterns** refer to horizontally manifest strabismus that changes in magnitude depending on the vertical position of the gaze. **1. Why Option A is Correct:** 'A'-pattern esotropia is defined by a horizontal deviation that is **more convergent (increased esotropia) in upward gaze** and **less convergent (decreased esotropia) in downward gaze**. By convention, a difference of **10 prism diopters (PD)** or more between the two gazes is clinically significant for an 'A' pattern. This is frequently associated with **superior oblique overaction**, which causes an abducting effect in downgaze, thereby reducing the esotropia as the eyes move down. **2. Why Other Options are Incorrect:** * **Option B:** This describes **'V'-pattern esotropia**, where the deviation is greater in downward gaze and lesser in upward gaze (often associated with inferior oblique overaction). * **Options C & D:** These do not follow the "Alphabet" morphology. A deviation that increases or decreases in both vertical directions would suggest a different complex motility disorder or a restrictive pathology rather than a standard A or V pattern. **3. High-Yield Clinical Pearls for NEET-PG:** * **Mnemonic:** Think of the shape of the letter. In **'A'**, the top is narrow (more ET/less XT) and the bottom is wide (less ET/more XT). In **'V'**, the top is wide and the bottom is narrow. * **Significance:** 'A' patterns are often associated with **Superior Oblique Overaction**, while 'V' patterns are associated with **Inferior Oblique Overaction**. * **Surgical Rule:** For 'A' patterns, the **Mnemonic "MILS"** (Medial In-Lateral Super) is used: move the Medial Rectus **U**pward or the Lateral Rectus **D**ownward to collapse the pattern.

Q: Which of the following is not a feature of congenital esotropia?

Surgery rarely required. **Explanation:** Congenital (Infantile) Esotropia is a large-angle inward deviation of the eyes that occurs early in life. The correct answer is **D (Surgery rarely required)** because surgery is actually the **mainstay of treatment**. Since the deviation is usually large (>30 prism diopters) and constant, it rarely resolves spontaneously. Early surgical intervention (usually bilateral medial rectus recession) is required, ideally before age 2, to promote the development of binocular single vision. **Analysis of other options:** * **A. Onset before 6 months:** By definition, infantile esotropia manifests within the first six months of life. If it occurs after 6 months, it is classified as acquired esotropia. * **B. Cross fixation:** This is a hallmark feature where the child uses the left eye to look at the right visual field and the right eye to look at the left visual field. This often eliminates the need for abduction, sometimes mimicking a pseudo-abducens nerve palsy. * **C. Inferior oblique overaction (IOOA):** This is a common associated finding, typically appearing after age 1 or 2. It results in elevation of the eye when it moves toward the nose (in adduction). **Clinical Pearls for NEET-PG:** * **Dissociated Vertical Deviation (DVD):** A classic association where the non-fixing eye drifts upward and outward. * **Latent Nystagmus:** Nystagmus that appears or worsens when one eye is covered. * **Refractive Error:** Usually normal for the child's age (mild hypermetropia); unlike accommodative esotropia, it is not corrected by glasses. * **Ciancia Syndrome:** A subtype characterized by large-angle esotropia, cross-fixation, and latent nystagmus.

Q: Which of the following findings is most consistent with accommodative esotropia?

Onset from infancy to 4 years of age. **Explanation:** **Accommodative Esotropia** is a common form of childhood strabismus caused by an overactive accommodative reflex. When a child with uncorrected hypermetropia (farsightedness) attempts to focus on an object, the excessive accommodation triggers an associated over-convergence (the AC/A ratio), leading to an inward deviation of the eyes. 1. **Why Option B is Correct:** The typical onset of accommodative esotropia is between **6 months and 7 years**, with a peak incidence between **2 and 4 years**. This coincides with the age when children begin to develop finer near-vision tasks and their accommodative system becomes more active. 2. **Why Incorrect Options are Wrong:** * **Option A:** Dissociated Vertical Deviation (DVD) is a hallmark of **Infantile (Congenital) Esotropia**, not accommodative esotropia. * **Option C:** While hypermetropia is the cause, it is typically in the range of **+2.00 to +6.00 D**. High hypermetropia (>+8.00 D) often results in blurred vision that the child cannot overcome, leading to a *lack* of accommodative effort and, consequently, no esotropia. * **Option D:** Unlike infantile esotropia, children with accommodative esotropia usually have **excellent binocular potential** if the deviation is corrected early with spectacles, as the eyes were straight during early infancy. **High-Yield Clinical Pearls for NEET-PG:** * **Treatment of Choice:** Full cycloplegic refraction and prescription of the **maximum plus power** glasses. * **AC/A Ratio:** High AC/A ratio esotropia is a subtype where the deviation is significantly greater at near than at distance. * **Amblyopia:** If the esotropia is not fully corrected or is monocular, it can lead to refractive or strabismic amblyopia.

Q: What is to be done for congenital cataract involving the visual axis?

Operate immediately. **Explanation:** The primary goal in managing congenital cataracts is the prevention of **stimulus-deprivation amblyopia**. When a cataract involves the visual axis (central and dense), it prevents a clear image from forming on the retina during the "critical period" of visual development. **1. Why "Operate Immediately" is correct:** Visual development is most rapid in the first few months of life. If the visual axis is obstructed, the brain permanently loses the ability to process images from that eye. To ensure the best visual prognosis, surgery is recommended as soon as possible—ideally within **4 to 6 weeks** for unilateral cataracts and **6 to 8 weeks** for bilateral cataracts. **2. Why the other options are incorrect:** * **Wait and watch / Appropriate age:** Delaying surgery leads to irreversible amblyopia and nystagmus. Unlike senile cataracts, "waiting for maturity" is contraindicated in pediatrics. * **Mydriatics:** While dilating drops can sometimes be used as a temporary measure for small, central zonular cataracts to allow light to pass around the opacity, they are not a definitive treatment for cataracts involving the visual axis. **Clinical Pearls for NEET-PG:** * **Surgical Technique:** The standard procedure is **Lens Aspiration + Posterior Capsulotomy + Anterior Vitrectomy**. This is because the posterior capsule opacifies rapidly in children. * **IOL Implantation:** Generally avoided in infants under 6 months to 1 year due to changing eye size and inflammatory response; contact lenses or aphakic glasses are used initially. * **Most common cause:** Most bilateral cases are idiopathic, but the most common infectious cause is **Congenital Rubella Syndrome** (look for "pearly white" cataract).

Q: Stimulation of the Panum's area results in which of the following?

Stereopsis. ### Explanation **1. Why Stereopsis is the Correct Answer:** To understand this, we must look at the concept of **Binocular Single Vision (BSV)**. * **Horopter:** This is an imaginary curved line in space where objects stimulate exactly corresponding retinal points, resulting in a single image. * **Panum’s Fusional Area:** This is a narrow zone immediately in front of and behind the horopter. Objects falling within this area stimulate **disparate (non-corresponding) retinal points** that are still close enough for the brain to fuse them. * **The Result:** This slight horizontal retinal disparity within Panum’s area is the physiological basis for **Stereopsis** (3D depth perception). **2. Why the Other Options are Incorrect:** * **Fusion (A):** While fusion occurs within Panum’s area, "Fusion" is a general term. Stereopsis is the *specific* sensory result of stimulating Panum’s area via slight disparity. Fusion of exactly corresponding points (on the horopter) does not produce stereopsis. * **Confusion (B):** This occurs when dissimilar objects stimulate corresponding retinal points (e.g., in strabismus), leading to two different images superimposed in the same visual direction. * **Diplopia (C):** This occurs when an object falls **outside** Panum’s fusional area, stimulating widely disparate retinal points that the brain cannot fuse, resulting in double vision. **3. Clinical Pearls for NEET-PG:** * **Degrees of BSV (Worth’s Classification):** 1. Simultaneous Macular Perception (Grade I) 2. Fusion (Grade II) 3. **Stereopsis (Grade III - Highest level)** * **Titmus Fly Test:** The most common clinical test used to evaluate stereopsis. * **Visual Requirement:** Stereopsis requires good vision in both eyes and proper alignment; it is lost in cases of constant strabismus or high anisometropia.

Q: What is the most common type of amblyopia?

Strabismic amblyopia. **Explanation:** **Amblyopia** (lazy eye) is a unilateral or bilateral reduction in best-corrected visual acuity caused by abnormal visual experience early in life. **Why Strabismic Amblyopia is the correct answer:** **Strabismic amblyopia** is clinically recognized as the **most common type** of amblyopia. It occurs when there is a misalignment of the eyes (usually esotropia). To avoid diplopia (double vision) and visual confusion, the brain actively suppresses the image from the deviated eye. Constant suppression during the critical period of visual development leads to a permanent deficit in the visual cortex associated with that eye. **Analysis of Incorrect Options:** * **Anisometropic Amblyopia:** This is the second most common type. It occurs due to a significant difference in refractive error between the two eyes, leading to one blurred image and one clear image. The brain favors the clearer eye. * **Ametropic (Isoametropic) Amblyopia:** A less common bilateral form caused by high, uncorrected refractive errors in both eyes (e.g., high hyperopia), leading to blurred vision in both eyes. * **Stimulus Deprivation Amblyopia:** This is the **least common** but **most severe** form. It results from physical obstruction of the visual axis (e.g., congenital cataract, ptosis). If not treated urgently, it leads to irreversible vision loss. **High-Yield Clinical Pearls for NEET-PG:** * **Critical Period:** The period of visual plasticity is generally from birth to **7–8 years** of age. Treatment after this age is significantly less effective. * **Treatment Gold Standard:** Occlusion therapy (patching) of the **better eye** to force the use of the amblyopic eye. * **Penalization:** Using Atropine drops in the better eye to blur near vision is an alternative to patching. * **Crowding Phenomenon:** Amblyopic eyes often find it easier to see isolated letters than a row of letters.

Question 1

Persistent Primary Hyperplastic Vitreous (PHPV) is associated with which condition?

Accepted Answer

Patau syndrome

Answer

Edward syndrome

Answer

Trisomy 14

Answer

Down syndrome

Question 2

Pseudoconvergent squint is seen with which of the following conditions?

Accepted Answer

Broad epicanthus

Answer

Thyrotoxicosis

Answer

Abducent squint

Answer

Narrow interpupillary distance

Question 3

A patient has right lateral rectus palsy. Towards which side will his head be deviated?

Accepted Answer

Towards right

Answer

Towards left

Answer

Upwards

Answer

Downwards

Question 4

In 'A'-esotropia, how does the amount of deviation change with vertical gaze?

Accepted Answer

Increases in upward gaze and decreases in downward gaze

Answer

Decreases in upward gaze and increases in downward gaze

Answer

Increases in upward as well as downward gaze

Answer

Decreases in upward as well as downward gaze

Question 5

Which of the following is not a feature of congenital esotropia?

Accepted Answer

Surgery rarely required

Answer

Onset before 6 months

Answer

Cross fixation

Answer

Inferior oblique overaction

Question 6

Which of the following findings is most consistent with accommodative esotropia?

Accepted Answer

Onset from infancy to 4 years of age

Answer

Dissociated vertical deviation

Answer

Hypermetropia of 8.00 D

Answer

Poor to no binocular potential

Question 7

What is to be done for congenital cataract involving the visual axis?

Accepted Answer

Operate immediately

Answer

Wait and watch

Answer

Operate when the baby reaches an appropriate age

Answer

Mydriatics are given

Question 8

Stimulation of the Panum's area results in which of the following?

Accepted Answer

Stereopsis

Answer

Fusion

Answer

Confusion

Answer

Diplopia

Question 9

Which of the following conditions can cause leukocoria?

Accepted Answer

Coats disease

Answer

Eales disease

Answer

Central serous retinopathy

Answer

Retinitis pigmentosa

Question 10

What is the most common type of amblyopia?

Accepted Answer

Strabismic amblyopia

Answer

Stimulus deprivation amblyopia

Answer

Anisometropic amblyopia

Answer

Ametropic amblyopia

Pediatric Ophthalmology and Strabismus — MCQs

Pediatric Ophthalmology and Strabismus — MCQs

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