Retinopathy of Prematurity — MCQs
Optic disc changes of retinitis pigmentosa:
What does extraretinal fibrovascular proliferation at the ridge indicate?
A child presents with night blindness, delayed dark adaptation. Which investigation is to be done further to confirm the diagnosis?
A diabetic patient presents to you with visual acuity of 6/9 in one eye. Further investigations revealed preretinal hemorrhages with neovascularization at the optic disc. What is the next step in management?
All of the following are true for retinopathy of prematurity except which of the following?
One year old male child with cat's reflex and raised IOP. What is the most likely diagnosis?
What is the gold standard method for visualizing the periphery of the retina?
What is the critical period for the development of the fixation reflex?
Which of the following conditions is inherited in an autosomal dominant pattern?
Which of the following extraocular muscles of the eye is involved in intorsion, depression, and abduction of the eyeball?
Retinopathy of Prematurity Indian Medical PG Practice Questions and MCQs
Question 1: Optic disc changes of retinitis pigmentosa:
- A. Hyperemia of disc
- B. Consecutive optic atrophy (Correct Answer)
- C. No significant change
- D. Blurring of disc margins
Explanation: **Consecutive optic atrophy** - In **retinitis pigmentosa**, the progressive degeneration of photoreceptors and retinal pigment epithelium leads to secondary or **consecutive optic atrophy**. - This atrophy is characterized by a **pale, waxy optic disc** due to loss of retinal ganglion cell axons and glia. *Hyperemia of disc* - **Hyperemia of the optic disc** indicates **inflammation** or **swelling** of the optic nerve head, such as in optic neuritis or papilledema. - This is not a typical feature of retinitis pigmentosa, which involves retinal degeneration, not acute inflammation of the optic nerve. *No significant change* - As **retinitis pigmentosa** progresses, significant changes occur in the retina and optic nerve, including **pigmentary deposits**, **vascular attenuation**, and **optic disc pallor**. - Therefore, stating no significant change would be incorrect as the disease significantly alters the fundus appearance. *Blurring of disc margins* - **Blurring of the optic disc margins** is a hallmark sign of **papilledema** (swelling due to increased intracranial pressure) or an acutely inflamed optic nerve head. - This is distinct from the **optic atrophy** seen in retinitis pigmentosa, which typically involves clear but pale disc margins.
Question 2: What does extraretinal fibrovascular proliferation at the ridge indicate?
- A. Normal retina
- B. Stage II Retinopathy of Prematurity
- C. Stage III Retinopathy of Prematurity (Correct Answer)
- D. Stage I Retinopathy of Prematurity
Explanation: ***Stage III Retinopathy of Prematurity*** - Extraretinal fibrovascular proliferation at the ridge is the defining characteristic of **Stage III Retinopathy of Prematurity (ROP)**. - This stage signifies significant **neovascularization** extending into the vitreous, increasing the risk of **retinal detachment**. *Normal retina* - A normal retina does not exhibit **fibrovascular proliferation** or a distinct ridge, as its vascularization is fully developed and confined to the retinal plane. - Absence of any abnormal vascular growth or demarcation line indicates a healthy, mature retinal structure. *Stage II Retinopathy of Prematurity* - Stage II ROP is characterized by a **ridge** that is elevated and appears three-dimensional, but it **lacks extraretinal fibrovascular proliferation**. - This stage represents progression from Stage I, where the demarcation line becomes a prominent ridge, but without new vessel formation outside the retina. *Stage I Retinopathy of Prematurity* - Stage I ROP is characterized by a thin, flat **demarcation line** distinguishing vascularized from avascular retina, without any significant elevation or fibrovascular proliferation. - This initial stage indicates an arrested phase of retinal vascular development, but without the more severe signs of neovascularization.
Question 3: A child presents with night blindness, delayed dark adaptation. Which investigation is to be done further to confirm the diagnosis?
- A. ERG (Correct Answer)
- B. Retinoscopy
- C. Dark adaptometry
- D. EOG
Explanation: ***ERG*** - **Electroretinography (ERG)** measures the electrical responses of various retinal cells, including **rods** and **cones**, to light stimuli. - In conditions like **retinitis pigmentosa** which cause night blindness and delayed dark adaptation, ERG will show characteristic abnormal or extinguished responses, confirming retinal dysfunction. *Retinoscopy* - **Retinoscopy** is an objective method to assess the refractive error of the eye by observing the light reflex from the retina. - It does not directly evaluate the functional integrity of photoreceptors or diagnose conditions causing **night blindness**. *Dark adaptometry* - **Dark adaptometry** measures the time it takes for the eye to adapt to dim light after exposure to bright light, quantifying the function of **rod photoreceptors**. - While it can *detect* delayed dark adaptation, it is a functional test that assesses the symptom, not the underlying cause provided by ERG. *EOG* - **Electrooculography (EOG)** measures the potential difference between the cornea and the retina, primarily assessing the function of the **retinal pigment epithelium (RPE)**. - While useful for conditions like **Best's disease**, it is less direct for evaluating generalized rod dysfunction causing night blindness compared to ERG.
Question 4: A diabetic patient presents to you with visual acuity of 6/9 in one eye. Further investigations revealed preretinal hemorrhages with neovascularization at the optic disc. What is the next step in management?
- A. Focal laser photocoagulation
- B. Pan-retinal photocoagulation (Correct Answer)
- C. Grid laser photocoagulation
- D. Scleral buckling
Explanation: ***Pan-retinal photocoagulation*** - The presence of **preretinal hemorrhages** and **neovascularization at the optic disc (NVD)** indicates **high-risk proliferative diabetic retinopathy (PDR)**. - **NVD is a high-risk characteristic** for severe vision loss and requires urgent treatment with **pan-retinal photocoagulation (PRP)**. - PRP aims to ablate ischemic peripheral retina, which reduces the production of **VEGF** and other angiogenic factors that stimulate neovascularization. *Focal laser photocoagulation* - This treatment targets discrete leaking microaneurysms in cases of **clinically significant macular edema (CSME)**, which is not the primary issue here. - It is used for **non-proliferative diabetic retinopathy** with macular involvement, not for neovascularization. *Grid laser photocoagulation* - Grid laser is a type of focal laser used for **diffuse macular edema** where specific leaking microaneurysms cannot be identified. - It is not indicated for **neovascularization** or **preretinal hemorrhages**, which are signs of PDR. *Scleral buckling* - **Scleral buckling** is a surgical procedure primarily used to treat **retinal detachment** by indenting the sclera to relieve vitreoretinal traction. - It is not the initial or primary treatment for **proliferative diabetic retinopathy** or **neovascularization**.
Question 5: All of the following are true for retinopathy of prematurity except which of the following?
- A. Due to hypoxia there occurs neovascularization followed by fibroproliferation
- B. Occurs in premature infants due to abnormal retinal blood vessel development.
- C. End result is bilateral blindness (Correct Answer)
- D. Blindness can be prevented by early diagnosis and ablation of avascular peripheral retina with cryotherapy or photocoagulation
Explanation: ***End result is bilateral blindness*** - While retinopathy of prematurity (ROP) can lead to severe vision loss or blindness, it is not always a bilateral end result, especially with early diagnosis and treatment. The severity can vary between eyes, and some cases resolve spontaneously. - Modern screening and intervention strategies, such as laser photocoagulation or anti-VEGF injections, are often successful in preventing complete blindness in one or both eyes. *Due to hypoxia there occurs neovascularization followed by fibroproliferation* - This statement accurately describes the pathogenesis of ROP. The initial phase involves delayed normal retinal vascularization, followed by a proliferative phase characterized by **neovascularization** in response to hypoxia in the avascular retina. - These new, abnormal vessels are fragile and prone to bleeding, and their associated **fibrovascular proliferation** can lead to retinal detachment. *Blindness can be prevented by early diagnosis and ablation of vascular premature retina with cryotherapy or photocoagulation* - This is a true statement. **Early diagnosis** through ophthalmologic screening of premature infants is crucial, and treatments like **laser photocoagulation** or **cryotherapy** are effective in ablating the avascular peripheral retina to halt the progression of abnormal vessel growth. - These interventions reduce the hypoxic drive that fuels neovascularization, thereby preventing severe retinal detachment and subsequent blindness. *Occurs in premature infants due to abnormal retinal blood vessel development.* - This statement is correct. ROP is a disease primarily affecting **premature infants** because their retinal blood vessels have not completed development by the time of birth. - Postnatal factors, including oxygen fluctuations and low birth weight, further disrupt this critical development, leading to **abnormal vascularization**.
Question 6: One year old male child with cat's reflex and raised IOP. What is the most likely diagnosis?
- A. Toxocara canis
- B. Retinopathy of prematurity
- C. Retinoblastoma (Correct Answer)
- D. Toxoplasma gondii infection
Explanation: ***Retinoblastoma*** - A **cat's reflex (leukocoria)**, which is a white pupillary reflex, is the most common presenting sign of retinoblastoma in children. - **Raised intraocular pressure (IOP)** can occur in advanced retinoblastoma due to secondary glaucoma caused by tumor growth or neovascularization. *Toxocara canis* - Ocular **toxocariasis** can cause leukocoria and inflammation, but it's typically associated with **granuloma formation** and not usually primary elevated IOP. - This condition is caused by a **parasitic infection** from roundworms, often seen in children with exposure to contaminated soil or pets. *Retinopathy of prematurity* - Primarily affects **premature infants** exposed to high oxygen, leading to abnormal retinal vessel development. - While it can cause leukocoria in severe stages, it would be unusual for a **one-year-old** to present with this primary diagnosis especially with raised IOP. *Toxoplasma gondii infection* - Ocular **toxoplasmosis** typically presents with **chorioretinitis** and can cause inflammation, but **leukocoria** and **raised IOP** are not its primary or most characteristic features. - This is a parasitic infection, congenital or acquired, often presenting with **retinal scars**.
Question 7: What is the gold standard method for visualizing the periphery of the retina?
- A. Direct ophthalmoscopy
- B. Indirect ophthalmoscopy (Correct Answer)
- C. Retinoscopy
- D. USG
Explanation: ***Correct: Indirect ophthalmoscopy*** - This method uses a **condensing lens** and a bright light source to provide a **wide-field, stereoscopic view** of the retina, making it ideal for visualizing the periphery. - It allows for examination even through some media opacities and is particularly useful for detecting peripheral retinal tears or detachments. - Provides a **field of view of 25-40 degrees** compared to only 5-10 degrees with direct ophthalmoscopy. *Incorrect: Direct ophthalmoscopy* - Provides a **highly magnified but narrow field of view**, making it difficult to systematically scan and visualize the entire peripheral retina. - It offers an **upright, monocular image** with limited depth perception, which is not optimal for assessing the three-dimensional structures of the retinal periphery. *Incorrect: Retinoscopy* - This is an objective method used to **determine the refractive error** of an eye, not for direct visualization of the retinal structures. - It involves observing the reflection of light from the retina as the examiner moves a light source across the eye. *Incorrect: USG* - **Ultrasound (USG)** is primarily used to visualize ocular structures when direct visualization is obscured by dense media opacities (e.g., severe cataracts, vitreous hemorrhage). - It provides 2D images and is not the gold standard for **routine, high-resolution visualization** of the retinal periphery when a clear view is obtainable.
Question 8: What is the critical period for the development of the fixation reflex?
- A. 2-4 months of age (Correct Answer)
- B. 6-8 months of age
- C. 2 years
- D. 3 years
Explanation: **Explanation:** The development of visual function in infants follows a specific chronological sequence. The **fixation reflex** is the ability of the eyes to focus on and follow an object. While a rudimentary fixation reflex is present at birth, it undergoes a critical maturation phase between **2 to 4 months of age**. By the end of the 4th month, a healthy infant should demonstrate steady, central, and maintained fixation. * **Why Option A is correct:** The neural pathways connecting the retina to the visual cortex and the motor pathways for ocular movement mature rapidly during this window. If an infant does not show steady fixation by 4 months, it is a clinical red flag for sensory deprivation (like congenital cataracts) or neurological delay. * **Why Options B, C, and D are incorrect:** By **6-8 months**, higher-order functions like stereopsis (depth perception) are maturing. **2 to 3 years** represents the tail end of the "plastic period" for amblyopia treatment, but the foundational reflex of fixation is established much earlier in infancy. **High-Yield Clinical Pearls for NEET-PG:** * **Visual Acuity at Birth:** Approximately 6/60 to 6/120 (reaches adult levels of 6/6 by 3–5 years). * **Stereopsis:** Begins at 3–4 months and is well-developed by 6 months. * **Critical Period for Amblyopia:** The period during which the visual system is plastic and sensitive to abnormal visual input; it lasts from birth until approximately **7–9 years of age**. * **Accommodation:** Reaches adult-like levels by **4 months**.
Question 9: Which of the following conditions is inherited in an autosomal dominant pattern?
- A. Retinoblastoma (Correct Answer)
- B. Ataxia telangiectasia
- C. Bloom's syndrome
- D. Xeroderma pigmentosa
Explanation: **Explanation:** The correct answer is **Retinoblastoma (Option A)**. Retinoblastoma is the most common primary intraocular malignancy of childhood. While 60% of cases are sporadic and unilateral, 40% are hereditary. Hereditary retinoblastoma follows an **Autosomal Dominant** inheritance pattern with high penetrance (90%). It is caused by a mutation in the **RB1 gene** located on chromosome **13q14**. According to **Knudson’s Two-Hit Hypothesis**, in hereditary cases, the first mutation (hit) is germline (inherited), and the second is somatic. This explains why hereditary cases are often bilateral, multifocal, and present at an earlier age. **Why the other options are incorrect:** * **Ataxia Telangiectasia (Option B):** This is an **Autosomal Recessive** multisystem disorder characterized by cerebellar ataxia, oculocutaneous telangiectasia, and immunodeficiency. It involves a defect in the ATM gene (DNA repair). * **Bloom’s Syndrome (Option C):** This is an **Autosomal Recessive** disorder characterized by short stature, photosensitivity, and genomic instability due to mutations in the BLM gene. * **Xeroderma Pigmentosa (Option D):** This is an **Autosomal Recessive** condition caused by a defect in nucleotide excision repair, leading to extreme sensitivity to UV light and a high risk of skin malignancies. **High-Yield Clinical Pearls for NEET-PG:** * **Most common presenting sign:** Leukocoria (White pupillary reflex). * **Second most common sign:** Strabismus. * **Pathognomonic Histology:** Flexner-Wintersteiner rosettes. * **Calcification:** Present in 90% of cases (visible on CT/Ultrasound B-scan); a key diagnostic feature. * **Trilateral Retinoblastoma:** Bilateral retinoblastoma associated with a pinealoblastoma.
Question 10: Which of the following extraocular muscles of the eye is involved in intorsion, depression, and abduction of the eyeball?
- A. Inferior rectus
- B. Superior rectus
- C. Inferior oblique
- D. Superior oblique (Correct Answer)
Explanation: **Explanation:** The actions of the extraocular muscles are determined by their anatomical origin and insertion relative to the center of rotation of the eyeball. **1. Why Superior Oblique (SO) is correct:** The Superior Oblique originates from the body of the sphenoid, passes through the **trochlea** (acting as a functional origin), and inserts into the postero-superior quadrant of the globe. Because it inserts behind the equator and approaches from the front-medial side, its contraction results in: * **Primary Action:** Intorsion (Inward rotation) * **Secondary Action:** Depression (Downwards) * **Tertiary Action:** Abduction (Outwards) * *Mnemonic:* **"SIN"** (Superior muscles are Intorters) and **"Obliques are Abductors."** **2. Why the other options are incorrect:** * **Inferior Rectus (IR):** Its primary action is depression, but its secondary actions are **extorsion** and **adduction**. * **Superior Rectus (SR):** Its primary action is elevation. Its secondary actions are **intorsion** and **adduction**. * **Inferior Oblique (IO):** Its primary action is **extorsion**. Its secondary actions are elevation and abduction. **High-Yield Clinical Pearls for NEET-PG:** * **RAD Rule:** Recti are Adductors (except Lateral Rectus). * **SIN Rule:** Superior muscles (SR & SO) are Intorters; Inferior muscles (IR & IO) are Extorters. * **Oblique Rule:** Obliques are Abductors; Recti are Adductors. * **Nerve Supply:** All muscles are supplied by CN III except Superior Oblique (**CN IV** - Trochlear) and Lateral Rectus (**CN VI** - Abducens) [Formula: **LR6SO4**]. * **Clinical Testing:** To isolate the Superior Oblique’s action of depression, the eye must be placed in an **adducted** position.
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