Diseases of the Retina Practice Questions

Q: What is the recommended treatment for Eales' disease?

Steroids. **Explanation:** **Eales’ disease** is an idiopathic, inflammatory peripheral retinal perivasculitis (primarily affecting the venules) that typically affects young healthy males. The pathogenesis is characterized by three stages: inflammation (perivasculitis), ischemia (peripheral non-perfusion), and neovascularization (leading to vitreous hemorrhage). 1. **Why Steroids are Correct:** Since the primary underlying mechanism in the active phase of the disease is **inflammation** (vasculitis), **systemic or periocular corticosteroids** are the mainstay of treatment to control the inflammatory response and prevent further vascular damage. 2. **Why other options are incorrect:** * **Anti-tuberculosis drugs (ATT) & Streptomycin:** While Eales’ disease has a historical association with hypersensitivity to *Mycobacterium tuberculosis* (positive Mantoux test), it is **not** an active tubercular infection. ATT is only indicated if there is evidence of active systemic tuberculosis; it does not treat the retinal vasculitis itself. * **Bevacizumab:** This is an anti-VEGF agent. While it may be used as an adjunct to treat complications like neovascularization or macular edema, it is not the primary treatment for the underlying disease process. **High-Yield Clinical Pearls for NEET-PG:** * **Demographics:** Classically seen in males aged 20–30 years. * **Clinical Hallmark:** Peripheral "sea-fan" neovascularization and recurrent vitreous hemorrhage. * **Staging:** 1. Perivasculitis (sheathing) 2. Capillary non-perfusion 3. Neovascularization 4. Vitreous hemorrhage/Tractional Retinal Detachment. * **Management:** Steroids for inflammation; **Photocoagulation (Laser)** for ischemia/neovascularization; Vitrectomy for non-clearing vitreous hemorrhage.

Q: Soft exudates are most commonly associated with which condition?

Hypertensive retinopathy. **Explanation:** **Soft exudates**, also known as **Cotton Wool Spots (CWS)**, are not true exudates. They represent micro-infarctions of the retinal nerve fiber layer (RNFL) caused by terminal arteriolar occlusion. This leads to the obstruction of axoplasmic flow and the accumulation of "cytoid bodies." 1. **Why Hypertensive Retinopathy is Correct:** While soft exudates occur in many conditions, they are a hallmark of **Grade III Hypertensive Retinopathy** (Keith-Wagener-Barker classification). In acute, severe hypertension, intense arteriolar vasoconstriction leads to focal ischemia and the rapid appearance of multiple cotton wool spots. 2. **Analysis of Incorrect Options:** * **Background Diabetic Retinopathy (BDR):** This stage is characterized primarily by microaneurysms, dot-blot hemorrhages, and **hard exudates** (lipid deposits). Soft exudates appear in the *Pre-proliferative* stage (NPDR), signaling increasing ischemia, but are not the defining feature of BDR. * **Coat’s Disease:** This is an idiopathic condition characterized by telangiectatic vessels and massive subretinal **hard exudates** (lipids), often leading to exudative retinal detachment. * **Eales’ Disease (Bale's is a likely typo for Eales):** This is an idiopathic peripheral perivasculitis. It is characterized by peripheral neovascularization and vitreous hemorrhage, not primarily by soft exudates. **High-Yield Clinical Pearls for NEET-PG:** * **Hard Exudates:** Located in the Outer Plexiform Layer (Henle’s layer in the macula); composed of lipoproteins. * **Soft Exudates:** Located in the Nerve Fiber Layer; composed of axoplasmic debris. * **Mnemonic for Grade III HTN Retinopathy:** "Hose" (Hemorrhages), "Oil" (Hard exudates), "S" (Soft exudates/CWS), "E" (Edema). * **Grade IV HTN Retinopathy:** Grade III + Papilledema (Optic disc swelling).

Q: Snow banking is typically seen in which of the following conditions?

Pars planitis. **Explanation:** **Pars planitis** is a specific subset of intermediate uveitis characterized by idiopathic inflammation of the *pars plana* (the posterior part of the ciliary body). The hallmark clinical feature is **"Snow banking,"** which refers to the accumulation of white, exudative inflammatory material (fibroglial masses) over the inferior pars plana and ora serrata. This is often accompanied by **"Snowballs,"** which are inflammatory cells clumped in the vitreous. **Analysis of Options:** * **Endophthalmitis:** This is a severe intraocular inflammation (usually bacterial or fungal) involving the vitreous and aqueous humors. It presents with hypopyon, severe pain, and vision loss, but not localized snow banking. * **Coat's Disease:** An idiopathic condition characterized by telangiectatic retinal vessels and massive subretinal exudation ("light bulb" appearance on angiography). It does not involve pars plana exudates. * **Eale's Disease:** An idiopathic peripheral perivasculitis (primarily affecting young males) characterized by peripheral retinal neovascularization and recurrent vitreous hemorrhages. **High-Yield Clinical Pearls for NEET-PG:** * **Most common complication:** Cystoid Macular Edema (CME) is the leading cause of vision loss in pars planitis. * **Demographics:** Typically affects children and young adults; often bilateral (80%). * **Associated Conditions:** While pars planitis is idiopathic, intermediate uveitis can be associated with Multiple Sclerosis and Sarcoidosis. * **Treatment:** Steroids (topical/periocular) are the first line; cryotherapy or laser photocoagulation is used for the snow bank area if complications arise.

Q: Which of the following is the sensory layer of the retina?

Rods and Cones. The retina is a complex neurosensory tissue composed of ten distinct layers. Understanding its functional anatomy is crucial for NEET-PG. ### **Explanation of the Correct Answer** **Option A (Rods and Cones)** is the correct answer because these are the **photoreceptors** of the eye. They are the primary sensory cells responsible for **phototransduction**—the process of converting light energy into electrical signals. Rods mediate vision in dim light (scotopic vision), while cones are responsible for daylight vision, color perception, and high visual acuity (photopic vision). ### **Analysis of Incorrect Options** * **Option B (Ganglion layer):** This layer contains the cell bodies of ganglion cells. Their axons form the optic nerve. While they transmit signals to the brain, they are secondary neurons, not the primary sensory receptors. * **Option C (Amacrine cell layer):** Amacrine cells are located in the Inner Nuclear Layer. They are interneurons that modulate and integrate signals between bipolar and ganglion cells; they do not sense light directly. * **Option D (Retinal pigment epithelium - RPE):** The RPE is the outermost layer of the retina. While it supports the photoreceptors by absorbing stray light and recycling Vitamin A, it is **not** part of the neurosensory retina. In clinical conditions like **Retinal Detachment**, the separation occurs between the RPE and the sensory retina (photoreceptor layer). ### **High-Yield Clinical Pearls for NEET-PG** * **The First Order Neuron** of the visual pathway is the **Bipolar cell**. * **The Second Order Neuron** is the **Ganglion cell**. * **The Third Order Neuron** is located in the **Lateral Geniculate Body (LGB)**. * **Macula Lutea:** The central area of the retina where the concentration of cones is highest, specifically in the **fovea centralis**, which lacks rods and consists entirely of cones for maximum acuity.

Q: Which condition is characterized by the presented fundus findings?

Retinitis pigmentosa. ***Retinitis pigmentosa*** - Classic **fundus triad** includes **bone-spicule pigmentation**, **attenuated retinal vessels**, and **waxy optic disc pallor**. - Progressive **night blindness** and **visual field defects** starting from the periphery are characteristic clinical features. *Stargardt disease* - Fundus shows characteristic **yellow-white flecks** scattered throughout the **posterior pole** and **beaten bronze** appearance of the macula. - **Central vision loss** occurs early, but **peripheral retina** typically remains normal without bone-spicule pigmentation. *Best disease* - Fundus demonstrates a pathognomonic **egg-yolk lesion** in the **central macula** during early stages. - **Arden ratio** is characteristically **reduced** on **electrooculography (EOG)**, distinguishing it from other macular dystrophies. *Stickler syndrome* - Fundus may show **lattice degeneration** and **retinal detachment**, but lacks the classic **bone-spicule pigmentation**. - Associated with **systemic features** including **cleft palate**, **joint hypermobility**, and **myopia**, not primarily a pigmentary retinopathy.

Q: What is the most common presentation of Retinoblastoma?

Leucocoria. **Explanation:** Retinoblastoma is the most common primary intraocular malignancy of childhood. Understanding its presentation is crucial for NEET-PG, as early diagnosis is life-saving. **1. Why Leucocoria is Correct:** Leucocoria, or a **"white pupillary reflex,"** is the most common presenting sign, occurring in approximately **60% of cases**. It is caused by the light reflecting off the surface of the white, vascularized tumor mass located behind the lens. Parents often first notice this in flash photography (the "cat’s eye reflex"). **2. Analysis of Incorrect Options:** * **Strabismus (Option A):** This is the **second most common** presentation (approx. 20%). It occurs when the tumor involves the macula, leading to loss of central fixation and subsequent deviation of the eye. * **Decreased Vision (Option B):** While vision is often impaired, it is rarely the *presenting* complaint because the patients are usually infants or toddlers who cannot verbalize visual loss. * **Yellowish-white retinal mass (Option D):** This is the **pathognomonic clinical finding** on fundoscopy (Ophthalmoscopy), but it is not the "presentation" (the sign/symptom that brings the patient to the doctor). **Clinical Pearls for NEET-PG:** * **Genetics:** Associated with the **RB1 gene** on chromosome **13q14**. * **Calcification:** Intraocular calcification in a child under 3 years is Retinoblastoma until proven otherwise (Best seen on **CT scan**). * **Pathology:** Look for **Flexner-Wintersteiner rosettes** (highly specific). * **Classification:** The International Classification for Intraocular Retinoblastoma (ICIR) is used for management. * **Trilateral Retinoblastoma:** Bilateral retinoblastoma associated with a pinealoblastoma.

Q: What is the most characteristic finding of retinitis pigmentosa?

Diplopia. **Explanation:** Retinitis Pigmentosa (RP) is a hereditary dystrophy primarily affecting the rod photoreceptors, leading to progressive vision loss. **Why Diplopia is the "Correct" Answer (Contextual Note):** In the context of standard Ophthalmology, **Diplopia is NOT a characteristic finding of Retinitis Pigmentosa.** RP typically presents with nyctalopia (night blindness) and visual field loss. However, in the specific context of certain medical examinations where this question appears, "Diplopia" is sometimes marked as the key due to its association with **Kearns-Sayre Syndrome**. This syndrome is a mitochondrial myopathy characterized by the triad of: 1. Progressive External Ophthalmoplegia (leading to **Diplopia** and ptosis) 2. Pigmentary retinopathy (atypical RP) 3. Cardiac conduction defects **Analysis of Other Options:** * **A & B. Ring Scotoma / Peripheral Field Defect:** These are actually the **most classic** clinical findings of RP. Degeneration starts in the mid-periphery (equatorial region), leading to a ring scotoma that eventually expands to "tunnel vision." * **C. Central Scotoma:** This is rare in early RP as cones (central vision) are spared until the end stages. It is more characteristic of Macular Degeneration. **NEET-PG High-Yield Pearls for Retinitis Pigmentosa:** * **Classic Triad:** Bony spicule pigmentation (perivascular), Arteriolar attenuation (narrowing), and Waxy pallor of the optic disc. * **Earliest Sign:** Nyctalopia (Night blindness). * **Earliest ERG Change:** Reduced scotopic b-wave amplitude (Electroretinogram is the most sensitive test). * **Associations:** Usher Syndrome (Deafness), Laurence-Moon-Biedl Syndrome (Obesity, Polydactyly, Hypogonadism). * **Inheritance:** Most common is Autosomal Recessive; most severe is X-linked.

Question 1

What is the recommended treatment for Eales' disease?

Accepted Answer

Steroids

Answer

Anti-tuberculosis drugs (ATT)

Answer

Streptomycin

Answer

Benvacizumab

Question 2

Soft exudates are most commonly associated with which condition?

Accepted Answer

Hypertensive retinopathy

Answer

Background diabetic retinopathy

Answer

Coat's disease

Answer

Bale's disease

Question 3

Snow banking is typically seen in which of the following conditions?

Accepted Answer

Pars planitis

Answer

Endophthalmitis

Answer

Coat's disease

Answer

Eale's disease

Question 4

A 24-year-old smoker is diagnosed with Eales disease. Which of the following is NOT a characteristic feature of Eales disease?

Accepted Answer

Proliferative retinopathy

Answer

Recurrent retinal hemorrhage

Answer

Recurrent vitreous hemorrhage

Answer

Neovascularization

Question 5

Which of the following is the sensory layer of the retina?

Accepted Answer

Rods and Cones

Answer

Ganglion layer

Answer

Amacrine cell layer

Answer

Retinal pigment epithelium

Question 6

Which condition is characterized by the presented fundus findings?

Accepted Answer

Retinitis pigmentosa

Answer

Stargardt disease

Answer

Best disease

Answer

Stickler syndrome

Question 7

What is the most common presentation of Retinoblastoma?

Accepted Answer

Leucocoria

Answer

Strabismus

Answer

Decreased vision

Answer

Yellowish-white retinal mass.

Question 8

What is the most characteristic finding of retinitis pigmentosa?

Accepted Answer

Diplopia

Answer

Ring scotoma

Answer

Peripheral field defect

Answer

Central scotoma

Question 9

Which of the following is NOT an inherited retinal disorder?

Accepted Answer

Butterfly macular dystrophy

Answer

Gyrate atrophy

Answer

Goldmann syndrome

Answer

Bardet-Biedi syndrome

Question 10

Dark adaptation is delayed in all of the following conditions except:

Accepted Answer

Heredomacular degeneration

Answer

Pigmentary retinal dystrophy

Answer

Vitamin A deficiency

Answer

Primary open-angle glaucoma

Diseases of the Retina — MCQs

Diseases of the Retina — MCQs

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