Pediatric Ophthalmology and Strabismus Practice Questions

Q: Extraretinal fibrovascular proliferation at the ridge between normal and avascular retina is characteristic of which grade of Retinopathy of Prematurity (ROP)?

Grade 3. **Explanation:** Retinopathy of Prematurity (ROP) is a vasoproliferative disorder of the retina in preterm infants. The International Classification of Retinopathy of Prematurity (ICROP) defines the severity of the disease through five distinct stages: * **Stage 3 (Correct Answer):** This stage is characterized by **extraretinal fibrovascular proliferation**. The hallmark is the growth of new, abnormal vessels (neovascularization) extending from the ridge into the vitreous. This is a critical stage as it indicates a high risk of progression to retinal detachment. **Analysis of Incorrect Options:** * **Stage 1:** Characterized by a thin, flat, white **demarcation line** separating the vascularized retina from the avascular retina. There is no height or thickness to this line. * **Stage 2:** The demarcation line progresses into a **ridge** that has height, width, and volume. However, the proliferation remains intraretinal (within the ridge). * **Stage 4:** Defined by **subtotal retinal detachment**. It is further divided into 4A (extra-foveal) and 4B (foveal involvement). Stage 5 represents total retinal detachment. **High-Yield Clinical Pearls for NEET-PG:** * **Screening Criteria (India):** Birth weight **<1750g** or Gestational Age **<34 weeks**, or infants with an unstable clinical course. * **Screening Timing:** First screening should be done at **4 weeks** post-natal age (or 3 weeks if born <28 weeks). * **Plus Disease:** Characterized by arterial tortuosity and venous dilation in the posterior pole; it indicates active, severe disease. * **Treatment:** Laser photocoagulation or Anti-VEGF (Ranibizumab/Bevacizumab) is typically indicated for "Type 1 ROP" (e.g., Stage 3 with Plus disease in Zone I or II).

Q: What is the management for a mature uniocular cataract in a 3-year-old child?

Surgical removal. **Explanation:** The management of a pediatric cataract is a medical emergency because the visual system is still in the "critical period" of development. **1. Why Surgical Removal is Correct:** In a 3-year-old with a mature uniocular cataract, the visual axis is completely obstructed. This leads to **stimulus-deprivation amblyopia** (lazy eye), which can become irreversible if the obstruction is not removed promptly. The goal of surgery (Lens aspiration + Posterior Capsulotomy + Anterior Vitrectomy ± IOL implantation) is to clear the visual axis and allow for immediate optical rehabilitation to ensure normal visual development. **2. Why Other Options are Incorrect:** * **Refraction:** A mature cataract is an opaque lens; light cannot pass through it. Refraction is only possible and effective after the cataract has been surgically removed. * **Absorption:** While very rare cases of spontaneous lens protein absorption occur (membranous cataract), it is unpredictable, often leads to inflammation (uveitis), and takes too long to prevent amblyopia. * **Observation:** Delaying treatment in a child leads to permanent visual loss due to dense amblyopia and potential sensory strabismus (squint). **Clinical Pearls for NEET-PG:** * **Critical Period:** The most sensitive period for visual development is from birth to 6 years of age. * **Timing:** For congenital cataracts, surgery is ideally performed within **4–6 weeks** for unilateral cases and **8–10 weeks** for bilateral cases. * **Surgical Technique:** In children, the posterior capsule must be addressed (**Primary Posterior Capsulotomy and Anterior Vitrectomy**) because the visual axis opacifies rapidly (100% rate) if the capsule is left intact. * **IOL:** Intraocular lens implantation is generally avoided in infants under 6 months but is the standard of care for a 3-year-old.

Q: Which of the following is the most common cause of vitreous hemorrhage in children?

Trauma. **Explanation:** **Vitreous hemorrhage (VH)** in the pediatric population is a significant clinical finding that often indicates severe underlying ocular pathology. **Why Trauma is the Correct Answer:** In children, **trauma** (both accidental and non-accidental) is the leading cause of vitreous hemorrhage, accounting for approximately **70% to 85%** of cases. This includes penetrating injuries, blunt trauma causing retinal tears, and Shaken Baby Syndrome (Non-accidental injury). In blunt trauma, the sudden anteroposterior compression and equatorial expansion of the globe lead to traction on the vitreous base or retinal vessels, resulting in hemorrhage. **Analysis of Incorrect Options:** * **Diabetic Retinopathy (A):** While this is the most common cause of VH in **adults**, it is extremely rare in children as proliferative changes typically take years to develop after the onset of Type 1 Diabetes. * **Eales Disease (B):** This is an idiopathic peripheral perivasculitis that primarily affects **young adult males** (20–40 years). It is a common cause of VH in the Indian subcontinent but is not the primary cause in the pediatric age group. * **Coats’ Disease (D):** This is a condition characterized by telangiectatic retinal vessels and exudation. While it can lead to retinal detachment, vitreous hemorrhage is a rare complication compared to trauma. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of VH in adults:** Proliferative Diabetic Retinopathy (PDR). * **Most common spontaneous (non-traumatic) cause of VH in children:** Pars Planitis or Persistent Fetal Vasculature (PFV). * **Terson Syndrome:** Vitreous hemorrhage associated with subarachnoid hemorrhage (due to a sudden rise in intracranial pressure). * **Management:** In children, early B-scan ultrasonography is mandatory to rule out retinal detachment, as visual deprivation can lead to permanent **amblyopia**.

Q: Most bilateral multifocal retinoblastoma require which of the following?

Multimodality therapy. **Explanation:** **Retinoblastoma (RB)** is the most common primary intraocular malignancy in children. The management of RB has evolved from life-saving to eye-saving and vision-preserving. **Why Multimodality Therapy is Correct:** Bilateral and multifocal cases are almost always **germline mutations** (hereditary). Because these patients have multiple tumors in both eyes, a single modality is rarely sufficient. **Multimodality therapy** is the standard of care to achieve "chemoreduction" followed by "consolidation." 1. **Systemic Chemotherapy (VEC protocol: Vincristine, Etoposide, Carboplatin):** Used to shrink the tumor volume. 2. **Local Therapy (Focal Consolidation):** Once shrunk, residual tumors are treated with Cryotherapy, Transpupillary Thermotherapy (TTT), or Brachytherapy. 3. **Intravitreal/Intra-arterial Chemotherapy:** Used for vitreous seeds or resistant tumors. **Why Other Options are Incorrect:** * **Chemotherapy (A):** While essential, it is rarely used alone as it carries a high risk of tumor recurrence without focal consolidation. * **Radiotherapy (B):** External Beam Radiation Therapy (EBRT) is now a **last resort** due to the high risk of secondary malignancies (like osteosarcoma) in children with germline mutations. * **Enucleation (C):** This is the treatment of choice for **Group E (advanced)** unilateral cases. In bilateral cases, the goal is to save at least one (if not both) eyes; enucleation is reserved only for the more severely affected eye if it has no visual potential. **High-Yield Clinical Pearls for NEET-PG:** * **Most common presenting sign:** Leukocoria (60%), followed by Strabismus. * **Pathognomonic Histology:** Flexner-Wintersteiner rosettes. * **Calcification:** A hallmark feature on CT scan (helps differentiate from Coats' disease). * **Classification:** The International Classification of Retinoblastoma (ICRB) groups tumors from A to E based on prognosis for eye salvage.

Q: In clinical aniridia, all of the following are true except:

Iris is completely absent. **Explanation:** **Aniridia** is a misnomer. Despite the name suggesting a complete absence of the iris, it is characterized by **variable degrees of iris hypoplasia**. Clinically, a rudimentary stump of iris tissue is always present, though it may only be visible via gonioscopy or high-resolution imaging. Therefore, **Option A is the correct answer** because the iris is never "completely" absent. **Analysis of other options:** * **Option B:** Most cases (approx. 2/3) are **familial**, following an **Autosomal Dominant** inheritance pattern due to mutations in the **PAX6 gene** on chromosome 11p13. Sporadic cases (1/3) are associated with WAGR syndrome. * **Option C:** Congenital or developmental **glaucoma** occurs in about 50–75% of cases, often due to the rudimentary iris stump pulling forward and obstructing the trabecular meshwork (angle closure). * **Option D:** Because the iris is hypoplastic, the **ciliary processes** and the suspensory ligaments (zonules) of the lens are often clearly visible during a slit-lamp examination. **High-Yield Clinical Pearls for NEET-PG:** * **WAGR Syndrome:** Sporadic aniridia must be screened for **W**ilms tumor, **A**niridia, **G**enitourinary anomalies, and mental **R**etardation (deletion of 11p13). * **Associated Ocular Findings:** Foveal hypoplasia (leading to nystagmus and poor vision), polar cataracts, and limbal stem cell deficiency (pannus). * **Management:** Regular abdominal ultrasounds are mandatory in sporadic cases to rule out Wilms tumor.

Q: In a 2-year-old child, which medication is used for refractive error testing?

1% atropine ointment. **Explanation:** In pediatric ophthalmology, the goal of refraction is to uncover the full hyperopic error by completely paralyzing the strong ciliary muscle (cycloplegia). **1. Why 1% Atropine Ointment is correct:** Atropine is the most potent cycloplegic available. In children under 5 years (especially those with accommodative esotropia), the ciliary muscle is very active, necessitating the strongest agent. **Ointment** is preferred over drops in toddlers because: * **Safety:** It minimizes systemic absorption through the nasolacrimal duct, reducing the risk of atropine toxicity (flushing, fever, tachycardia). * **Reliability:** It is easier to apply in a struggling child and is not washed away by tears. The standard regimen is twice daily for three days prior to the examination. **2. Why other options are incorrect:** * **1% Atropine eye drop:** While pharmacologically similar, drops carry a higher risk of systemic toxicity in small children due to rapid drainage into the nose and absorption through the mucosa. * **Tropicamide 0.5%:** This is a short-acting mydriatic with weak cycloplegic action. It is insufficient to overcome the accommodation of a 2-year-old and is typically used for adult fundus examinations. * **Eucatropine 5%:** This is a weak mydriatic rarely used in modern clinical practice and lacks the cycloplegic potency required for pediatric refraction. **Clinical Pearls for NEET-PG:** * **Drug of Choice (DOC) by Age:** * Drops). * 5–15 years: Homatropine or Cyclopentolate. * > 15 years: Tropicamide or Phenylephrine. * **Atropine Toxicity Antidote:** Physostigmine. * **Contraindication:** Atropine should be avoided in children with Down syndrome as it may cause an exaggerated pupillary response and tachycardia.

Q: Diplopia is a characteristic feature of which of the following?

Paralytic squint. **Explanation:** **1. Why Paralytic Squint is Correct:** Diplopia (double vision) occurs when the visual axes are misaligned, causing the image of an object to fall on the fovea of the fixing eye and on a non-foveal (extra-foveal) retinal point of the deviated eye. In **Paralytic Squint**, there is a sudden loss of motor coordination due to nerve or muscle palsy. Because the onset is typically acquired and the brain has already developed binocular single vision, it cannot immediately "ignore" the second image. This results in true binocular diplopia, which is most marked in the direction of the paralyzed muscle's action. **2. Why the Other Options are Incorrect:** * **Concomitant (Non-paralytic) Squint:** Usually occurs in early childhood. The developing brain utilizes compensatory mechanisms like **suppression** (ignoring the image from the deviated eye) or **amblyopia** to avoid diplopia. Therefore, diplopia is characteristically absent. * **Latent Squint (Heterophoria):** This is a condition where the deviation is kept latent by the power of sensory fusion. Diplopia only occurs if the phoria "breaks down" into a tropia due to fatigue or illness; otherwise, the eyes remain aligned under normal conditions. **3. Clinical Pearls for NEET-PG:** * **Primary vs. Secondary Deviation:** In paralytic squint, the **secondary deviation** (deviation of the sound eye when the paralyzed eye fixes) is always **greater** than the primary deviation (due to Hering’s Law of equal innervation). * **False Orientation (Past-pointing):** A hallmark of paralytic squint where the patient projects the image further than the object's actual position. * **Compensatory Head Posture:** Patients often tilt or turn their heads toward the direction of the paralyzed muscle to minimize diplopia.

Q: What is the instrument of choice for diagnosing pediatric retinal disorders?

Retcam. **Explanation:** The **Retcam (Retinal Camera)** is the gold standard for diagnosing and documenting pediatric retinal disorders, most notably **Retinopathy of Prematurity (ROP)**. It is a wide-field digital imaging system specifically designed for infants. Unlike adult imaging tools, the Retcam uses a contact probe that fits easily between small palpebral fissures, providing a 130-degree view of the retina. This allows for objective documentation, remote screening (tele-ophthalmology), and monitoring of disease progression in neonates who cannot cooperate with traditional examinations. **Analysis of Incorrect Options:** * **Optical Coherence Tomography (OCT):** While excellent for macular pathology, standard tabletop OCT requires patient cooperation and a steady chin rest, making it impractical for infants. (Note: Handheld OCT exists but is not the primary screening tool). * **Fluorescein Angiography (FA):** This is an invasive procedure involving dye injection. While it can be performed using a Retcam (FA-mode), it is a specialized investigation rather than the primary diagnostic instrument of choice. * **Slit Lamp Examination:** This is used primarily for anterior segment evaluation. Even with a 90D lens, it is extremely difficult to perform on an uncooperative infant and provides a limited field of view compared to the Retcam. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard for ROP Screening:** Indirect Ophthalmoscopy (using a 28D lens) remains the clinical gold standard, but **Retcam** is the instrument of choice for digital documentation and objective diagnosis. * **Leukocoria:** Retcam is vital in the workup of a "white pupillary reflex" to differentiate between Retinoblastoma, Coats' disease, and ROP. * **Plus Disease in ROP:** Characterized by arterial tortuosity and venous dilation in at least 2 quadrants of the posterior pole; Retcam imaging is superior for tracking these vascular changes.

Question 1

Extraretinal fibrovascular proliferation at the ridge between normal and avascular retina is characteristic of which grade of Retinopathy of Prematurity (ROP)?

Accepted Answer

Grade 3

Answer

Grade 1

Answer

Grade 2

Answer

Grade 4

Question 2

What is the management for a mature uniocular cataract in a 3-year-old child?

Accepted Answer

Surgical removal

Answer

Refraction

Answer

Absorption

Answer

Observation without intervention

Question 3

Which of the following is the most common cause of vitreous hemorrhage in children?

Accepted Answer

Trauma

Answer

Diabetic Retinopathy

Answer

Eales disease

Answer

Coat's disease

Question 4

Which one of the following statements, concerning persistent hyperplastic primary vitreous (PHPV) is not true?

Accepted Answer

Visual prognosis is usually good

Answer

It is generally unilateral

Answer

It may calcify

Answer

It is most easily differentiated from retinoblastoma by the presence of exophthalmos or cataract

Question 5

Most bilateral multifocal retinoblastoma require which of the following?

Accepted Answer

Multimodality therapy

Answer

Chemotherapy

Answer

Radiotherapy

Answer

Enucleation

Question 6

In clinical aniridia, all of the following are true except:

Accepted Answer

Iris is completely absent

Answer

Usually a familial condition

Answer

May be associated with congenital glaucoma

Answer

Ciliary processes may be visible

Question 7

For a neonate born at 28 weeks of gestation who is being treated in the NICU for sepsis, at what corrected age should ROP screening be performed?

Accepted Answer

30 weeks postmenstrual age

Answer

32 weeks postmenstrual age

Answer

34 weeks postmenstrual age

Answer

36 weeks postmenstrual age

Question 8

In a 2-year-old child, which medication is used for refractive error testing?

Accepted Answer

1% atropine ointment

Answer

1% atropine eye drop

Answer

Tropicamide 0.5%

Answer

Eucatropine 5%

Question 9

Diplopia is a characteristic feature of which of the following?

Accepted Answer

Paralytic squint

Answer

Concomitant squint

Answer

Non-paralytic squint

Answer

Latent squint

Question 10

What is the instrument of choice for diagnosing pediatric retinal disorders?

Accepted Answer

Retcam

Answer

Optical Coherence Tomography (OCT)

Answer

Fluorescein angiography

Answer

Slit lamp examination

Pediatric Ophthalmology and Strabismus — MCQs

Pediatric Ophthalmology and Strabismus — MCQs

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