Pediatric Ophthalmology and Strabismus — MCQs

Pediatric Ophthalmology and Strabismus Indian Medical PG Practice Questions and MCQs

Question 61: All of the following can cause a white pupillary reflex except?

A. Toxocara endophthalmitis
B. Retinal detachment
C. PHPV
D. Congenital Glaucoma (Correct Answer)

Explanation: **Explanation:** The white pupillary reflex, known as **Leukocoria**, is a critical clinical sign in pediatric ophthalmology indicating an intraocular abnormality that reflects light back through the pupil. **Why Congenital Glaucoma is the Correct Answer:** Congenital Glaucoma typically presents with the "classic triad" of **epiphora (tearing), photophobia, and blepharospasm**. The hallmark physical finding is a **large, cloudy cornea (buphthalmos)** due to elevated intraocular pressure and corneal edema. It does **not** cause a white reflex behind the lens; rather, it causes a hazy or "steamy" appearance of the anterior segment. **Analysis of Incorrect Options (Causes of Leukocoria):** * **Toxocara endophthalmitis:** A parasitic infection (Toxocara canis) that causes a chronic endophthalmitis leading to a dense vitreous abscess or a peripheral retinal granuloma, resulting in leukocoria. * **Retinal Detachment (RD):** In children, conditions like Coats’ disease or advanced Retinopathy of Prematurity (ROP) can lead to total exudative or tractional RD. The detached retina behind the lens appears as a white mass. * **PHPV (Persistent Hyperplastic Primary Vitreous):** Now termed Persistent Fetal Vasculature (PFV), this is a congenital anomaly where the primary vitreous fails to regress, forming a fibrovascular membrane behind the lens. **High-Yield Clinical Pearls for NEET-PG:** * **Retinoblastoma** is the most common life-threatening cause of leukocoria and must be ruled out first. * **Congenital Cataract** is the most common overall cause of leukocoria. * **Differential Diagnosis of Leukocoria (Mnemonic: "C-R-E-A-M"):** **C**ataract, **R**etinoblastoma/RD, **E**ndophthalmitis (Toxocara), **A**strocytic Hamartoma, **M**alformations (PHPV/Coats’ disease). * **Haab’s Striae** (horizontal breaks in Descemet’s membrane) are a specific sign of Congenital Glaucoma, not leukocoria.

Question 62: Which of the following statements regarding familial retinoblastoma are correct?

A. Has autosomal recessive inheritance
B. More commonly bilateral (Correct Answer)
C. Due to mutation
D. More common than sporadic retinoblastoma

Explanation: **Explanation:** Retinoblastoma (RB) is the most common primary intraocular malignancy of childhood. Understanding the genetic basis is crucial for NEET-PG, specifically **Knudson’s "Two-Hit" Hypothesis**. **Why Option B is Correct:** Familial (heritable) retinoblastoma occurs due to a germline mutation in the **RB1 gene** on chromosome **13q14**. In these cases, the "first hit" is present in every cell of the body. A "second hit" (somatic mutation) occurs early in retinal development. Because the germline mutation is ubiquitous, there is a high probability of multiple tumors developing in both eyes. Thus, familial RB is **characteristically bilateral (and often multifocal)**. **Analysis of Incorrect Options:** * **Option A:** Familial RB follows an **autosomal dominant** inheritance pattern with high penetrance (90%), not autosomal recessive. * **Option C:** While it is due to a mutation, Option B is a more specific clinical descriptor of the familial form. (Note: In many exams, "More commonly bilateral" is the classic distinguishing feature tested). * **Option D:** Sporadic (non-heritable) retinoblastoma is actually **more common**, accounting for approximately **60%** of all cases, whereas familial cases account for about 40%. **High-Yield Clinical Pearls for NEET-PG:** * **Most common presenting sign:** Leukocoria (White pupillary reflex). Second most common: Strabismus. * **Pathology:** Look for **Flexner-Wintersteiner rosettes** (highly specific) and Homer-Wright rosettes. * **Trilateral Retinoblastoma:** Bilateral RB associated with a pinealoblastoma. * **Calcification:** RB is the most common cause of intraocular calcification in a child under 3 years (visible on CT scan). * **Risk:** Patients with familial RB have a high predisposition to secondary non-ocular tumors, most commonly **Osteosarcoma**.

Question 63: Amaurotic cat's eye reflex is seen in:

A. Papilloedema
B. Papillitis
C. Retinoblastoma (Correct Answer)
D. Retinitis pigmentosa

Explanation: **Explanation:** **Amaurotic cat’s eye reflex**, also known as **leukocoria** (white pupillary reflex), is the most common presenting sign of **Retinoblastoma**, the most common intraocular malignancy of childhood. In a normal eye, the pupil appears red during a fundus examination (red reflex) due to the vascularity of the choroid. In Retinoblastoma, a whitish-yellow mass grows from the retina into the vitreous cavity (endophytic growth), reflecting light back through the pupil and mimicking the glow seen in a cat's eye. **Analysis of Options:** * **Retinoblastoma (Correct):** The reflex is caused by the solid, calcified tumor mass behind the lens. It is a "medical emergency" to rule out malignancy in any child presenting with leukocoria. * **Papilloedema:** This is passive swelling of the optic disc due to increased intracranial pressure. It affects the optic nerve head but does not create a large intraocular mass or a white pupillary reflex. * **Papillitis:** This is inflammatory swelling of the optic disc (a form of optic neuritis). Clinical features include sudden vision loss and an afferent pupillary defect, not leukocoria. * **Retinitis Pigmentosa:** This is a degenerative rod-cone dystrophy characterized by "bone-spicule" pigmentation in the mid-periphery and arteriolar attenuation. The pupil remains dark or shows a normal red reflex. **High-Yield Clinical Pearls for NEET-PG:** * **Differential Diagnosis of Leukocoria:** Retinoblastoma (most common), Congenital Cataract, Coats’ Disease, Persistent Fetal Vasculature (PFV), and Retinopathy of Prematurity (ROP). * **Pathognomonic Sign:** Chalky white **calcification** seen on B-scan USG or CT scan is highly suggestive of Retinoblastoma. * **Flexner-Wintersteiner Rosettes:** These are the characteristic histological markers for Retinoblastoma. * **Genetics:** Associated with the **RB1 gene** on chromosome **13q14**.

Question 64: How does retinoblastoma spread?

A. Vascular invasion
B. Direct invasion
C. Optic nerve (Correct Answer)
D. Lymphatic spread

Explanation: **Explanation:** Retinoblastoma is the most common primary intraocular malignancy of childhood. The primary and most significant route of spread is via the **optic nerve**. **Why Optic Nerve is the Correct Answer:** The tumor cells invade the lamina cribrosa and travel along the optic nerve to reach the subarachnoid space. Once in the cerebrospinal fluid (CSF), the tumor can spread to the brain and leptomeninges. This is why the length of the optic nerve resected during enucleation is a critical prognostic factor; a "positive margin" at the cut end of the nerve significantly increases the risk of intracranial metastasis. **Analysis of Incorrect Options:** * **Vascular Invasion (A):** While retinoblastoma is highly vascular and can spread hematogenously to distant sites like bone marrow, lungs, and liver, this typically occurs later or in specific endophytic patterns. It is not the primary characteristic route compared to the optic nerve. * **Direct Invasion (B):** The tumor can grow through the sclera into the orbit (exophytic growth), but the sclera acts as a relatively tough natural barrier. This is less common than neural spread. * **Lymphatic Spread (D):** The eye lacks a traditional lymphatic drainage system. Lymphatic spread only occurs if the tumor involves the conjunctiva or eyelids, draining to the preauricular and submandibular nodes. **High-Yield Clinical Pearls for NEET-PG:** * **Most common presentation:** Leukocoria (60%), followed by strabismus. * **Flexner-Wintersteiner Rosettes:** Pathognomonic histological feature (indicates photoreceptor differentiation). * **Homer-Wright Rosettes:** Seen in retinoblastoma but also in neuroblastoma and medulloblastoma. * **Calcification:** A hallmark sign on CT scan (helps differentiate from Coats' disease). * **Trilateral Retinoblastoma:** Bilateral RB associated with a pinealoblastoma.

Question 65: Normal visual acuity of 6/6 is typically achieved by what age?

A. 2 years
B. 3 years (Correct Answer)
C. 5 years
D. 7 years

Explanation: **Explanation:** The development of visual acuity is a gradual process that begins at birth and matures throughout early childhood. While a newborn has very poor vision (approximately 6/60 to 6/120), the anatomical and physiological pathways of the macula and visual cortex develop rapidly during the first few years of life. **Why 3 years is correct:** According to the most recent clinical guidelines and standardized pediatric vision charts (such as Lea Symbols or Allen Pictures), a child typically achieves **6/6 (20/20) vision by the age of 3 years**. While older textbooks sometimes cited 5 or 6 years, modern testing methods have demonstrated that the neural architecture for adult-level acuity is functional by age 3. **Analysis of Incorrect Options:** * **A. 2 years:** At this age, the average visual acuity is approximately 6/12 to 6/9. Coordination and fixation are well-developed, but the resolution has not yet reached the 6/6 threshold. * **C. 5 years:** By age 5, vision is firmly established at 6/6, but this is not the *earliest* age it is typically achieved. * **D. 7 years:** This age marks the end of the "plastic period" of visual development. If a child has not achieved normal vision by age 7-8 due to stimulus deprivation or refractive errors, they are at high risk for permanent **amblyopia** (lazy eye). **High-Yield Clinical Pearls for NEET-PG:** * **Fixation:** A child should be able to "fix and follow" a target by **3 months** of age. * **Stereopsis:** Depth perception typically develops between **3 to 6 months**. * **Critical Period:** The most sensitive period for visual development is from birth to **2 years**; however, the plastic period extends up to **7–9 years**. * **Preferential Looking:** Used to assess acuity in infants (e.g., Teller Acuity Cards).

Question 66: Spontaneous absorption of lenticular material and bilateral microphthalmos is seen in which of the following conditions?

A. Myotonic dystrophy
B. Hallermann Streiff syndrome (Correct Answer)
C. Aniridia
D. Persistent hyperplastic primary vitreous

Explanation: **Explanation:** **Hallermann-Streiff Syndrome (HSS)**, also known as oculomandibulofacial syndrome, is a rare genetic disorder characterized by a distinct "bird-like" facies. The hallmark ocular finding is **bilateral microphthalmos** associated with **congenital cataracts**. A unique and high-yield feature of HSS is the **spontaneous rupture of the lens capsule**, leading to the **spontaneous absorption of lenticular material**, which may leave behind a clear aphakic pupillary area. **Analysis of Options:** * **Myotonic Dystrophy:** Characterized by the classic **"Christmas tree cataract"** (polychromatic luster). While it involves lens opacities, it does not feature microphthalmos or spontaneous lens absorption. * **Aniridia:** Defined by the partial or complete absence of the iris. Associated findings include glaucoma, foveal hypoplasia, and Wilms tumor (WAGR syndrome), but not spontaneous lens absorption. * **Persistent Hyperplastic Primary Vitreous (PHPV):** Now called Persistent Fetal Vasculature (PFV). It is typically **unilateral** and presents with a white pupillary reflex (leukocoria) and a shallow anterior chamber. While the eye is often microphthalmic, the lens material does not spontaneously absorb in the manner seen in HSS. **Clinical Pearls for NEET-PG:** * **Hallermann-Streiff Triad:** Bird-like facies (beaked nose, mandibular hypoplasia), dental anomalies, and proportionate dwarfism. * **Ocular findings in HSS:** Microphthalmos, congenital cataracts (spontaneous absorption), and nystagmus. * **Differential for Spontaneous Lens Absorption:** Hallermann-Streiff Syndrome and Lowe’s (Oculocerebrorenal) Syndrome. * **Key distinction:** HSS is usually bilateral, whereas PHPV is usually unilateral.

Question 67: At what age is a child with amblyopia typically considered for surgery?

A. Less than 5 years (Correct Answer)
B. 5-10 years
C. 10-15 years
D. 18 years

Explanation: **Explanation:** The correct answer is **A. Less than 5 years**. **Why it is correct:** Amblyopia (lazy eye) is a developmental disorder of the visual cortex caused by abnormal visual experience during the **"critical period"** of visual development. The human visual system is highly plastic in early childhood, typically up to age 7–8. For surgical intervention to be most effective—especially in cases of **stimulus deprivation amblyopia** (e.g., congenital cataracts or severe ptosis) or **strabismic amblyopia**—it must be performed as early as possible. Operating before age 5 ensures that the brain receives a clear, aligned image while the visual cortex is still adaptable, maximizing the chances of restoring binocular single vision and preventing permanent vision loss. **Why other options are incorrect:** * **B & C (5–15 years):** By this age, the "critical period" is nearing its end or has concluded. While some plasticity remains (especially up to age 12), the success rate for reversing amblyopia through surgery or patching drops significantly. Surgery at this stage is often considered **cosmetic** rather than functional. * **D (18 years):** At this age, visual development is complete. Surgery for strabismus in an adult with amblyopia will align the eyes but will not improve the visual acuity of the amblyopic eye. **High-Yield Clinical Pearls for NEET-PG:** * **The "Golden Period":** Treatment for amblyopia is most successful if initiated before age 7. * **Most common cause:** Strabismus is the most frequent cause of amblyopia, followed by anisometropia. * **Management Sequence:** Always treat the cause first (e.g., clear the media, correct refractive errors) followed by **occlusion therapy** (patching the "good" eye) or pharmacological penalization (atropine). * **Rule of Thumb:** In congenital cataracts, surgery should ideally be performed within the first **4–6 weeks** of life to prevent irreversible stimulus deprivation amblyopia.

Question 68: What is the most common site of bony metastases in retinoblastoma?

A. Skull bones (Correct Answer)
B. Hip bones
C. Ribs
D. Vertebrae

Explanation: **Explanation:** Retinoblastoma is the most common intraocular malignancy of childhood. While it primarily spreads via direct extension through the optic nerve to the brain, distant hematogenous metastasis can also occur. **Why Skull Bones are the Correct Answer:** Hematogenous spread in retinoblastoma has a predilection for the **bone marrow and skeletal system**. Among the bones, the **skull bones** are the most common site for metastatic deposits. This is often attributed to the proximity of the primary tumor to the cranial vault and the specific vascular drainage patterns. These metastases often present clinically as palpable soft tissue masses or "bumps" on the head, which are a classic sign of advanced systemic disease. **Analysis of Incorrect Options:** * **B, C, and D (Hip bones, Ribs, Vertebrae):** While retinoblastoma can involve any part of the skeleton (long bones, pelvis, and ribs) once it disseminates hematogenously, these sites are statistically less frequent than the skull. In pediatric oncology, while the spine and pelvis are common sites for other tumors (like Neuroblastoma), the skull remains the primary skeletal site for Retinoblastoma. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site of distant metastasis:** Bone marrow (overall), followed by the skeleton (Skull). * **Most common mode of spread:** Direct extension via the **optic nerve** to the subarachnoid space. * **Trilateral Retinoblastoma:** A specific syndrome involving bilateral retinoblastoma associated with a midline intracranial tumor (usually a **Pineoblastoma**). * **Flexner-Wintersteiner Rosettes:** The most characteristic histological feature (though Homer-Wright rosettes can also be seen). * **Calcification:** Present in 90% of cases; seen as "fine specks" on B-scan USG or CT.

Question 69: The Maddox rod test is used for assessing which of the following?

A. Macular function (Correct Answer)
B. Lens opacity
C. Amount of tear production
D. Vitreous hemorrhage

Explanation: **Explanation:** The **Maddox rod test** is primarily known in strabismus evaluation to detect and measure latent deviations (phorias). However, in the context of **pre-operative assessment for cataract surgery**, it is a vital clinical tool used to assess **macular function**. **Why the correct answer is right:** When a patient has a dense cataract (media opacity), the clinician must determine if the retina/macula is functional before proceeding with surgery. When a point source of light is held behind a Maddox rod, a healthy macula perceives a **sharp, continuous red line** perpendicular to the rods. If the patient perceives a broken, wavy, or distorted line, or cannot see the line at all, it suggests macular pathology (e.g., macular degeneration or scarring), indicating a guarded visual prognosis post-surgery. **Why the incorrect options are wrong:** * **Lens opacity:** While the test is performed *in the presence* of lens opacity, it does not measure the opacity itself. Opacity is assessed via slit-lamp biomicroscopy or distant direct ophthalmoscopy. * **Amount of tear production:** This is evaluated using the **Schirmer’s test** or Phenol Red Thread test. * **Vitreous hemorrhage:** This is a media opacity typically evaluated using **B-scan ultrasonography** to check for retinal detachment or the density of the bleed. **High-Yield Clinical Pearls for NEET-PG:** * **Maddox Rod Principle:** It works on the principle of **dissimilar retinal images**, preventing sensory fusion. * **Orientation:** If the rods are horizontal, the patient sees a **vertical** line (tests horizontal phoria). If rods are vertical, the patient sees a **horizontal** line (tests vertical phoria). * **Other Macular Function Tests:** Entoptic phenomenon (Purkinje images), Two-point discrimination, and Laser Interferometry. * **Contraindication:** It cannot be used in patients with suppression or lack of binocular single vision.

Question 70: Rosettes are characteristic in which of the following conditions?

A. Retinoblastoma (Correct Answer)
B. Lymphoma
C. Melanoma
D. Dysgerminoma

Explanation: **Explanation:** **Retinoblastoma** is the most common primary intraocular malignancy of childhood. The presence of **rosettes** is a hallmark histopathological feature, representing the attempt of primitive neuroepithelial cells to differentiate into photoreceptor-like structures. There are two main types of rosettes seen in Retinoblastoma: 1. **Flexner-Wintersteiner Rosettes:** Highly specific for Retinoblastoma. They consist of a ring of columnar cells surrounding a central lumen (containing hyaluronic acid), mimicking primitive photoreceptors. 2. **Homer-Wright Rosettes:** Less specific; these lack a central lumen and instead have a central tangle of neural fibrils (pseudorosettes). They are also seen in Neuroblastoma and Medulloblastoma. **Why the other options are incorrect:** * **Lymphoma:** Typically characterized by a monotonous population of small round blue cells or large atypical lymphocytes, depending on the subtype (e.g., Primary Intraocular Lymphoma). * **Melanoma:** Histology shows spindle cells (Type A or B) or epithelioid cells. It is the most common primary intraocular tumor in adults, not children. * **Dysgerminoma:** A germ cell tumor (usually ovarian) characterized by nests of uniform germ cells separated by fibrous septa containing lymphocytes. **High-Yield Clinical Pearls for NEET-PG:** * **Leukocoria (White pupillary reflex):** The most common presenting sign of Retinoblastoma. * **Calcification:** A key radiological feature (seen on CT/USG) that helps differentiate it from Coats' disease. * **Fleurettes:** Represent more advanced photoreceptor differentiation (benign-looking foci). * **Genetics:** Associated with the **RB1 gene** on chromosome **13q14**. * **Trilateral Retinoblastoma:** Bilateral retinoblastoma associated with a pineal gland tumor (Pineoblastoma).

Practice by Chapter

Amblyopia

Practice Questions

Esotropia

Practice Questions

Exotropia

Practice Questions

Vertical Deviations

Practice Questions

Special Forms of Strabismus

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Nystagmus in Children

Practice Questions

Pediatric Cataract

Practice Questions

Retinopathy of Prematurity

Practice Questions

Pediatric Glaucoma

Practice Questions

Pediatric Neuro-ophthalmology

Practice Questions

Genetic Eye Diseases in Children

Practice Questions

Pediatric Ocular Trauma

Practice Questions

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