Pediatric Ophthalmology and Strabismus — MCQs

Pediatric Ophthalmology and Strabismus Indian Medical PG Practice Questions and MCQs

Question 201: What is the refractive state of a newborn's eye?

A. Emmetropic
B. Myopic
C. Hypermetropic (Correct Answer)
D. Astigmatic

Explanation: **Explanation:** The refractive state of a newborn’s eye is typically **Hypermetropic**. At birth, the average axial length of the eye is approximately **17–18 mm**, which is significantly shorter than the adult average of 24 mm. Because the eyeball is physically short, the light rays entering the eye converge at a focal point behind the retina, resulting in physiological hypermetropia. The average refractive error in a full-term newborn is approximately **+2.0 to +3.0 Diopters**. As the child grows, the eye undergoes a process called **Emmetropization**, where the axial length increases, and the corneal curvature and lens power flatten to balance the refractive state toward emmetropia. **Analysis of Options:** * **A. Emmetropic:** This is the "ideal" state where light focuses exactly on the retina. While this is the goal of development, it is rarely present at birth due to the short axial length. * **B. Myopic:** Myopia (nearsightedness) occurs when the eyeball is too long or the refractive power is too high. This is uncommon in full-term newborns but can be seen in cases of Prematurity (Retinopathy of Prematurity). * **D. Astigmatic:** While many infants have some degree of corneal astigmatism, it is not the defining refractive state of a newborn. **High-Yield Facts for NEET-PG:** * **Axial Length:** Newborn (~17.5 mm) → Age 3 (~22-23 mm) → Adult (~24 mm). * **Corneal Power:** Newborns have steeper corneas (~50 D) compared to adults (~43 D). * **Emmetropization:** Most children reach an emmetropic state by age 6–7. * **Clinical Pearl:** If a newborn is myopic or has high hypermetropia (>+5.0 D), it is considered pathological and requires monitoring to prevent amblyopia.

Question 202: Which of the following is the most common cause of chronic iridocyclitis in children?

A. Juvenile idiopathic arthritis (Correct Answer)
B. Systemic lupus erythematosus
C. Sjögren's syndrome
D. Behçet's disease

Explanation: **Explanation:** **Juvenile Idiopathic Arthritis (JIA)** is the most common systemic association and cause of chronic anterior uveitis (iridocyclitis) in the pediatric population. The uveitis associated with JIA is typically **nongranulomatous, chronic, and characteristically asymptomatic** (white-eyed/quiet eye), making it particularly dangerous as it can lead to irreversible vision loss before diagnosis. It is most frequently seen in the **Oligoarticular** subtype, especially in young girls who are **ANA (Antinuclear Antibody) positive**. **Analysis of Incorrect Options:** * **Systemic Lupus Erythematosus (SLE):** While SLE can cause ocular manifestations, it more commonly presents with posterior segment involvement (retinal vasculitis or cotton wool spots) rather than chronic iridocyclitis. * **Sjögren's Syndrome:** This primarily affects the lacrimal glands, leading to **Keratoconjunctivitis Sicca** (dry eye). It is rare in children and does not typically cause primary iridocyclitis. * **Behçet's Disease:** This causes a classic "cold" **hypopyon uveitis**. While it is a cause of uveitis, it is less common in children compared to JIA and usually presents as acute recurrent episodes rather than a primary chronic course. **High-Yield Clinical Pearls for NEET-PG:** * **The "Triad" of JIA Uveitis:** Iridocyclitis, Band-shaped keratopathy, and Complicated cataract. * **Screening:** ANA positivity is the strongest predictor for the development of uveitis in JIA patients. * **Treatment:** Topical steroids and cycloplegics are first-line; Methotrexate is the preferred steroid-sparing agent for chronic cases. * **Key Fact:** Because the eye is often asymptomatic ("White Eye"), periodic slit-lamp screening is mandatory for all children diagnosed with JIA.

Question 203: Aniridia is associated with which of the following conditions?

A. Retinoblastoma
B. Hepatoblastoma
C. Wilms tumor (Correct Answer)
D. Medulloblastoma

Explanation: **Explanation:** **Aniridia** is a bilateral condition characterized by the partial or complete absence of the iris. It is most commonly associated with **Wilms tumor** (nephroblastoma) as part of the **WAGR syndrome**. **Why Wilms Tumor is correct:** The association is genetic. Both the *PAX6* gene (responsible for eye development) and the *WT1* gene (Wilms tumor suppressor gene) are located in close proximity on the short arm of **chromosome 11 (11p13)**. A microdeletion in this region leads to WAGR syndrome, which consists of: * **W**ilms tumor * **A**niridia * **G**enitourinary abnormalities (e.g., cryptorchidism) * **R**etardation (Intellectual disability) **Why other options are incorrect:** * **Retinoblastoma:** Associated with a mutation in the *RB1* gene on **chromosome 13q14**. It presents with leukocoria (white reflex) but is not syndromically linked to aniridia. * **Hepatoblastoma:** Associated with Beckwith-Wiedemann syndrome and Familial Adenomatous Polyposis (FAP), not aniridia. * **Medulloblastoma:** Often associated with Gorlin syndrome or Turcot syndrome, but lacks a clinical link to iris hypoplasia. **High-Yield Clinical Pearls for NEET-PG:** 1. **Inheritance:** Most cases of aniridia (85%) are autosomal dominant (Miller’s syndrome) and are *not* associated with Wilms tumor. The sporadic form carries a 30% risk of Wilms tumor. 2. **Ocular Complications:** Aniridia is often associated with secondary glaucoma (due to angle closure), foveal hypoplasia (leading to nystagmus and poor vision), and limbal stem cell deficiency. 3. **Screening:** Any child with sporadic aniridia must undergo regular **renal ultrasounds** (every 3 months until age 7) to screen for Wilms tumor.

Question 204: Pseudoesotropia is associated with which of the following?

A. Hypertelorism
B. Negative angle kappa (Correct Answer)
C. Positive angle kappa
D. None of the above

Explanation: **Explanation:** **Pseudoesotropia** is a clinical condition where the eyes appear to be crossed (turned inward) despite being orthophoric (perfectly aligned). This false impression of esotropia is primarily caused by facial anatomy or optical axes. **Why Negative Angle Kappa is the Correct Answer:** Angle Kappa is the angle between the **visual axis** (line from the object to the fovea) and the **pupillary axis** (line through the center of the pupil). * In a **negative angle kappa**, the fovea is situated nasal to the pupillary axis. To align the visual axis with an object, the eye must shift slightly outward (temporally). * When the eye shifts outward, the light reflex appears to fall on the temporal side of the cornea, making the eye look as if it is turned inward (esotropia). **Analysis of Incorrect Options:** * **A. Hypertelorism:** This refers to an increased distance between the bony orbits. It is typically associated with **pseudoxantropia** (pseudoexotropia), as the wide-set eyes give the appearance of an outward deviation. * **C. Positive Angle Kappa:** This occurs when the fovea is temporal to the pupillary axis (common in hypermetropes). It causes the eye to shift inward to fixate, making the light reflex appear nasal. This results in **pseudoexotropia**. **High-Yield Clinical Pearls for NEET-PG:** 1. **Most Common Cause:** The most common cause of pseudoesotropia in infants is **prominent epicanthal folds** (which hide the nasal sclera) and a **broad, flat nasal bridge**. 2. **Diagnosis:** The **Cover-Uncover Test** is the gold standard; in pseudo-strabismus, there is no corrective movement of the eyes. 3. **Hirschberg Test:** In pseudoesotropia, the corneal light reflex is central or slightly temporal, whereas in true esotropia, it is displaced temporally. 4. **Positive Angle Kappa** is associated with **Hypermetropia**; **Negative Angle Kappa** is associated with **High Myopia**.

Question 205: All of the following are true about paralytic strabismus EXCEPT:

A. Binocular diplopia
B. False orientation
C. Primary deviation = Secondary deviation (Correct Answer)
D. False projection

Explanation: In paralytic strabismus, the fundamental physiological principle is **Hering’s Law of Equal Innervation**. This law states that when a nervous impulse is sent to a muscle to contract, an equal impulse is sent to its yolk muscle in the fellow eye. ### Why Option C is the Correct Answer (The Exception) In paralytic strabismus, the **Secondary deviation** (deviation of the normal eye when the paralyzed eye is fixing) is always **greater than the Primary deviation** (deviation of the paralyzed eye when the normal eye is fixing). * **Mechanism:** To move the paralyzed eye into its field of action, the brain must send an abnormally strong neural impulse. According to Hering’s Law, this excessive impulse is also sent to the healthy yolk muscle of the other eye, causing it to over-rotate. * In contrast, **Primary deviation = Secondary deviation** is a hallmark of **Non-paralytic (Concomitant) strabismus**. ### Why Other Options are Wrong (Features of Paralytic Strabismus) * **A. Binocular Diplopia:** This is a classic feature. Because the visual axes are not aligned, images fall on non-corresponding retinal points. It disappears when one eye is closed. * **B & D. False Orientation/Projection:** These terms are synonymous. Due to the increased innervation required to move the paralyzed eye, the brain "overestimates" the position of the object in space. If the patient is asked to point quickly at an object, they will point beyond it in the direction of the paralyzed muscle’s action (past-pointing). ### High-Yield Clinical Pearls for NEET-PG * **Head Tilt/Posturing:** Patients often adopt a compensatory head position to minimize diplopia and maintain binocular single vision. * **Limitation of Movement:** Unlike concomitant squint, paralytic squint shows a marked limitation of ocular motility in the field of action of the paralyzed muscle. * **Bielschowsky Head Tilt Test:** Used specifically to diagnose **Superior Oblique (IV Nerve) palsy**.

Question 206: What is the most common second malignancy in survivors of retinoblastoma?

A. Thyroid cancer
B. Nasopharyngeal carcinoma
C. Optic glioma
D. Osteosarcoma (Correct Answer)

Explanation: **Explanation:** The correct answer is **Osteosarcoma**. **Why Osteosarcoma?** Retinoblastoma is caused by a mutation in the **RB1 gene** (a tumor suppressor gene located on chromosome 13q14). In the heritable (germline) form of the disease, this mutation is present in every cell of the body. Survivors of heritable retinoblastoma have a significantly increased risk of developing secondary non-ocular malignancies later in life. **Osteosarcoma** (bone cancer) is the most common second primary malignancy, followed by soft tissue sarcomas and melanoma. This risk is further exacerbated if the patient received external beam radiation therapy (EBRT) during initial treatment. **Analysis of Incorrect Options:** * **Thyroid cancer:** While radiation exposure can increase thyroid cancer risk, it is not the most common secondary malignancy associated specifically with the RB1 mutation. * **Nasopharyngeal carcinoma:** This is strongly associated with the Epstein-Barr Virus (EBV) and is not a characteristic secondary tumor of the RB1 germline mutation. * **Optic glioma:** This is most commonly associated with **Neurofibromatosis Type 1 (NF1)**, not retinoblastoma. **High-Yield Clinical Pearls for NEET-PG:** * **Trilateral Retinoblastoma:** Refers to bilateral retinoblastoma associated with a pineal gland tumor (pineoblastoma). * **Most common site for Osteosarcoma in RB survivors:** The femur (long bones), though it can occur in the skull if radiation was used. * **Inheritance:** 40% of cases are heritable (autosomal dominant with 90% penetrance); 60% are sporadic/non-heritable. * **Flexner-Wintersteiner Rosettes:** Pathognomonic histological feature of retinoblastoma.

Question 207: What is the most common eyeball tumor?

A. Retinoblastoma
B. Sarcoma
C. Medulloblastoma
D. Malignant melanoma (Correct Answer)

Explanation: **Explanation:** The question asks for the most common eyeball tumor overall, without age-specific restrictions. **1. Why Malignant Melanoma is correct:** Uveal tract melanoma (specifically **Choroidal Melanoma**) is the most common **primary intraocular malignancy in adults**. When considering the general population across all age groups, it remains the most frequent primary tumor of the eyeball. It arises from melanocytes within the uveal tract (iris, ciliary body, or choroid) and typically presents in the 5th to 6th decades of life. **2. Why the other options are incorrect:** * **Retinoblastoma:** This is the most common primary intraocular tumor in **children**. While it is a high-yield topic in pediatric ophthalmology, its overall incidence is lower than that of adult uveal melanoma. * **Sarcoma:** Primary sarcomas of the eyeball (like rhabdomyosarcoma) are extremely rare and usually involve the orbit rather than the globe itself. * **Medulloblastoma:** This is a primitive neuroectodermal tumor (PNET) of the cerebellum (CNS) and does not occur as a primary eyeball tumor. **Clinical Pearls for NEET-PG:** * **Most common intraocular tumor overall:** Metastatic carcinoma (most commonly from breast in females and lung in males). Note: If "Metastasis" is an option, it is the most common; if "Primary" is specified or metastasis is absent, Melanoma is the answer. * **Most common primary intraocular tumor in adults:** Malignant Melanoma. * **Most common primary intraocular tumor in children:** Retinoblastoma. * **Most common site for Uveal Melanoma:** Choroid (85%), followed by the ciliary body and iris. * **Investigation of choice:** B-Scan Ultrasonography (shows "collar-stud" or mushroom appearance and excavation of the choroid).

Question 208: What is the recommended treatment for uniocular retinoblastoma in the 1st and 2nd stages?

A. Enucleation (Correct Answer)
B. Radiotherapy
C. Chemotherapy
D. None of the above

Explanation: ### Explanation **Correct Answer: A. Enucleation** In the context of **uniocular (unilateral) retinoblastoma**, the primary goal is to save the patient's life, followed by preserving the eye and vision. Historically and clinically, for unilateral cases where the tumor is often advanced at the time of presentation (Stages 1 and 2 in the Reese-Ellsworth classification or Group D/E in the International Classification), **Enucleation** is the gold standard. The underlying medical concept is that in uniocular disease, the other eye is healthy; therefore, removing the affected eye provides a definitive cure by eliminating the risk of intracranial extension or metastasis without significantly compromising the child's overall visual development. **Why other options are incorrect:** * **Radiotherapy (External Beam Radiotherapy):** While effective at shrinking tumors, it is associated with a high risk of secondary malignancies (like osteosarcoma) and facial bone growth retardation. It is generally reserved for bilateral cases or as a salvage therapy. * **Chemotherapy:** Systemic "Chemoreduction" is primarily used to shrink large tumors to a size manageable by local therapies (like cryotherapy or laser) or in bilateral cases to avoid radiation. In unilateral Stage 1 or 2, enucleation is often preferred over the prolonged toxicity of systemic chemotherapy. **High-Yield Clinical Pearls for NEET-PG:** * **Most common intraocular tumor** in children. * **Most common presentation:** Leukocoria (white pupillary reflex), followed by strabismus. * **Pathology:** Flexner-Wintersteiner rosettes (highly specific) and Homer-Wright rosettes. * **Calcification:** Dystrophic calcification is a hallmark feature seen on B-scan USG or CT scan. * **Genetics:** Mutation in the **RB1 gene** on chromosome **13q14**. * **Management Rule:** If the tumor involves >50% of the retina or there is optic nerve involvement, Enucleation is mandatory.

Question 209: Dissociated vertical deviation is seen in which condition?

A. AV dissociation
B. Infantile esotropia
C. Congenital esotropia (Correct Answer)
D. Superior oblique palsy

Explanation: **Explanation:** **Dissociated Vertical Deviation (DVD)** is a unique ocular motility disorder characterized by the slow upward drifting and outward rotation of an eye when it is covered or when the patient is inattentive. Unlike true vertical strabismus, DVD does not obey Hering’s Law of equal innervation (the other eye does not move down when the affected eye moves up). **Why Congenital Esotropia is Correct:** DVD is a classic component of the **Ciancia Syndrome** (Infantile/Congenital Esotropia). It is found in approximately **50–90%** of patients with congenital esotropia, usually manifesting after the age of 18 months. Its presence is a strong clinical indicator of a disruption in early binocular development. **Analysis of Incorrect Options:** * **AV Dissociation:** This is a cardiology term referring to the independent beating of atria and ventricles. In ophthalmology, "A and V patterns" refer to horizontal deviations that change in superior or inferior gaze, but they are not synonymous with DVD. * **Infantile Esotropia:** While often used interchangeably with congenital esotropia in clinical practice, "Congenital Esotropia" is the more specific term used in standard textbooks (like Khurana) to describe the triad associated with DVD. (Note: In many exams, these are synonyms, but "Congenital" is the preferred nomenclature for this association). * **Superior Oblique Palsy:** This presents with a **hypertropia** that increases on contralateral head tilt (Bielschowsky test). Unlike DVD, it follows Hering’s Law and involves a true vertical deviation. **High-Yield Clinical Pearls for NEET-PG:** * **The Triad of Congenital Esotropia:** 1. Large angle esotropia, 2. Dissociated Vertical Deviation (DVD), 3. Inferior Oblique Overaction (IOOA). * **Latent Nystagmus:** Also frequently associated with congenital esotropia. * **Bielschowsky Phenomenon:** In DVD, placing a neutral density filter over the fixing eye causes the deviated (elevated) eye to move downward.

Question 210: Which of the following conditions can premature babies develop?

A. Buphthalmos
B. Retinopathy of prematurity (Correct Answer)
C. Increased incidence of myopia
D. Persistent hyaloid artery

Explanation: **Explanation:** **Retinopathy of Prematurity (ROP)** is the correct answer because it is a vasoproliferative disorder specifically linked to premature birth and low birth weight. In a fetus, retinal vascularization begins at the optic disc at 16 weeks and reaches the nasal periphery by 36 weeks and the temporal periphery by 40 weeks. Premature birth interrupts this process, leaving the peripheral retina avascular. Subsequent exposure to high oxygen levels (hyperoxia) followed by relative hypoxia triggers the release of **VEGF (Vascular Endothelial Growth Factor)**, leading to abnormal neovascularization. **Analysis of Incorrect Options:** * **Buphthalmos (A):** This refers to the enlargement of the globe seen in **Congenital Glaucoma** due to high intraocular pressure. It is a developmental defect of the angle of the anterior chamber, not specifically associated with prematurity. * **Increased incidence of myopia (C):** While premature infants *do* have a higher risk of refractive errors (including myopia and astigmatism) later in life, ROP is the primary, acute, and most characteristic condition directly resulting from the pathophysiology of preterm birth. * **Persistent hyaloid artery (D):** This is a failure of the fetal hyaloid vascular system to regress during the third trimester. While it is a congenital anomaly, it is not a consequence of premature birth itself. **High-Yield Clinical Pearls for NEET-PG:** * **Screening Criteria:** All babies born **<32 weeks** gestation or with a birth weight **<1500g** must be screened for ROP. * **Zone I** (centered on the disc) is the most critical area; disease here is more severe. * **Plus Disease:** Characterized by dilatation and tortuosity of retinal vessels; it indicates active, severe ROP. * **Treatment:** Laser photocoagulation or Intravitreal Anti-VEGF (e.g., Ranibizumab) are the mainstays for Type 1 ROP.

Practice by Chapter

Amblyopia

Practice Questions

Esotropia

Practice Questions

Exotropia

Practice Questions

Vertical Deviations

Practice Questions

Special Forms of Strabismus

Practice Questions

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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