Diseases of the Retina Practice Questions

Q: A 70-year-old man presents with deterioration of vision 3 weeks after cataract extraction and intraocular lens implantation. Slit lamp examination shows honeycomb maculopathy and fluorescein angiography shows 'flower petal' hyperfluorescence. What is the most likely diagnosis?

Cystoid Macular Edema. **Explanation:** The clinical presentation and classic imaging findings point directly to **Cystoid Macular Edema (CME)**, specifically **Irvine-Gass Syndrome**, which occurs following cataract surgery. **1. Why the Correct Answer is Right:** CME involves the accumulation of fluid in the outer plexiform (Henle’s) and inner nuclear layers of the retina. * **Honeycomb Maculopathy:** On slit-lamp biomicroscopy, the fluid-filled cysts create a characteristic honeycomb appearance. * **Flower Petal Appearance:** On Fluorescein Angiography (FFA), dye leaks into the star-shaped Henle’s layer around the fovea, creating a "petalloid" or "flower petal" pattern of hyperfluorescence. * **Timing:** Post-cataract CME typically peaks 4–6 weeks after surgery, matching this patient's 3-week timeline. **2. Why Other Options are Incorrect:** * **ARMD:** Presents with drusen (Dry) or choroidal neovascularization/hemorrhage (Wet). FFA would show "stippled" fluorescence or a classic "smoke-stack/pedal" leak, not a petalloid pattern. * **CSR:** Typically affects younger males (20–50 years) and is associated with stress/steroids. FFA shows a "smoke-stack" or "ink-blot" appearance. * **Macular Dystrophy:** These are usually bilateral, genetic conditions (e.g., Stargardt’s) presenting at a younger age with specific patterns like "beaten bronze" macula or "dark choroid" on FFA. **High-Yield Clinical Pearls for NEET-PG:** * **Irvine-Gass Syndrome:** CME occurring specifically after cataract surgery. * **Gold Standard Investigation:** Optical Coherence Tomography (OCT) is now the investigation of choice (shows intraretinal cystic spaces), though FFA remains a classic exam favorite for its "flower petal" description. * **Treatment:** First-line management includes topical NSAIDs (e.g., Nepafenac or Ketorolac) and topical steroids.

Q: What is the investigation of choice for vitreous hemorrhage?

B-Scan. **Explanation:** The investigation of choice for vitreous hemorrhage is **B-Scan (Brightness Scan) ultrasonography**. **Why B-Scan is the Correct Answer:** In cases of vitreous hemorrhage, the blood creates media opacity, making it impossible for the clinician to visualize the posterior segment (retina) using an ophthalmoscope. B-Scan is a two-dimensional, cross-sectional gray-scale ultrasound that can "see through" opaque media. It is essential to rule out underlying sight-threatening conditions such as **Retinal Detachment (RD)** or intraocular tumors, which may be the cause of the hemorrhage. On B-Scan, fresh vitreous hemorrhage appears as low-amplitude, mobile dots or echoes. **Why Other Options are Incorrect:** * **A. Ultrasound Biomicroscopy (UBM):** This uses high-frequency ultrasound to visualize the **anterior segment** (ciliary body, iris, angle) in high resolution. It cannot penetrate deep enough to evaluate the posterior vitreous or retina. * **B. A-Scan:** This is a one-dimensional linear scan used primarily for **biometry** (measuring axial length) to calculate IOL power. It does not provide a structural image of the retina. * **D. Optical Coherence Tomography (OCT):** OCT uses light waves (interferometry). Like ophthalmoscopy, light cannot penetrate dense blood; therefore, OCT is ineffective when a significant vitreous hemorrhage is present. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause** of vitreous hemorrhage: Diabetic Retinopathy (Proliferative). * **Most common cause in trauma:** Mechanical globe injury. * **B-Scan "Membrane" Differentiation:** On B-Scan, a **Retinal Detachment** appears as a high-amplitude, thick, bright membrane that is attached to the optic disc, whereas a **Posterior Vitreous Detachment (PVD)** is a thin, low-amplitude membrane that moves freely and is not attached to the disc.

Q: Snowball opacities are characteristic findings in which ocular condition?

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 findings are: 1. **Snowballs:** These are whitish, inflammatory vitreous condensations or aggregates of inflammatory cells, typically found in the inferior vitreous. 2. **Snowbanking:** This refers to the accumulation of inflammatory exudates (exudative plaques) over the pars plana, most commonly seen in the inferior quadrant. **Analysis of Options:** * **Option A (Acute anterior uveitis):** This primarily presents with aqueous cells, flare, and Keratic Precipitates (KPs) on the corneal endothelium. It does not typically involve the vitreous or pars plana. * **Option B (Posterior uveitis):** While this involves the retina and choroid (e.g., toxoplasmosis, CMV retinitis), "snowballs" are specifically associated with the intermediate compartment (vitreous/pars plana) rather than primary retinal inflammation. * **Option D:** Incorrect, as Pars planitis is the classic association. **High-Yield Clinical Pearls for NEET-PG:** * **Intermediate Uveitis:** The most common cause of vitreous haze/cells in a young patient. * **Most common complication:** Cystoid Macular Edema (CME), which is the primary cause of vision loss in these patients. * **Systemic Association:** Pars planitis is often idiopathic but can be associated with **Multiple Sclerosis (MS)** and Sarcoidosis. * **Treatment:** Usually involves periocular or systemic corticosteroids; "Double-freeze" cryotherapy or laser photocoagulation is used for the snowbank area in resistant cases.

Q: Retinoblastoma differs from pseudoglioma by which of the following?

Enlargement of the optic foramen. **Explanation:** The key to distinguishing **Retinoblastoma** (a malignant intraocular tumor of childhood) from **Pseudoglioma** (non-neoplastic conditions like Coats' disease or persistent hyperplastic primary vitreous that mimic its appearance) lies in the invasive nature of the malignancy. **1. Why "Enlargement of the optic foramen" is correct:** Retinoblastoma has a high propensity for **extraocular extension**. The tumor cells frequently invade the optic nerve [1]. As the tumor grows along the nerve toward the brain, it causes pressure atrophy and expansion of the bony walls of the optic canal. On radiological imaging (X-ray or CT), an **enlarged optic foramen** is a classic sign of intracranial extension of the tumor, a feature absent in pseudogliomas. **2. Why other options are incorrect:** * **Decreasing intraocular pressure (IOP):** In Retinoblastoma, the IOP is typically **increased** (secondary glaucoma) due to the mass effect or neovascularization. Decreased IOP (hypotony) is more characteristic of inflammatory pseudogliomas or endophthalmitis. * **Blurring of vision:** This is a non-specific symptom. Both Retinoblastoma and various forms of pseudoglioma present with visual impairment and **leukocoria** (white pupillary reflex), making it useless for differential diagnosis. **Clinical Pearls for NEET-PG:** * **Inheritance:** Associated with the **RB1 gene** on chromosome **13q14** [2]. * **Pathology:** Look for **Flexner-Wintersteiner rosettes** (highly specific) [1]. * **Calcification:** Intraocular calcification seen on CT scan is a hallmark of Retinoblastoma (present in 90% of cases) [1]. * **Most common presentation:** Leukocoria (60%), followed by Strabismus (20%).

Q: A patient complains of sudden onset blindness without experiencing any pain. What is the likely cause?

Vitreous haemorrhage. ### Explanation The clinical presentation of **sudden, painless loss of vision** is a classic "must-know" for NEET-PG. **Why Vitreous Haemorrhage is correct:** Vitreous haemorrhage (VH) occurs when blood extravasates into the vitreous cavity, often due to proliferative diabetic retinopathy (most common cause), retinal tears, or trauma. Because the vitreous is normally transparent, the sudden presence of blood blocks light from reaching the retina, leading to an immediate drop in vision. Since the retina and vitreous lack pain fibers, the process is entirely painless. Patients often describe "floaters" or "cobwebs" before total vision loss occurs. **Why the other options are incorrect:** * **Glaucoma:** Acute Angle Closure Glaucoma presents with sudden vision loss, but it is **exceedingly painful** and associated with a "stony hard" eye, nausea, and vomiting. Chronic glaucoma is painless but causes gradual, not sudden, vision loss. * **Cataract:** This causes a **gradual, progressive**, and painless blurring of vision (not sudden blindness). * **Age-related Macular Degeneration (ARMD):** While the "wet" type can cause relatively rapid vision loss due to subretinal hemorrhage, it typically results in **metamorphopsia** (distorted vision) or a central scotoma rather than total sudden blindness. **Clinical Pearls for NEET-PG:** * **Differential Diagnosis for Sudden Painless Vision Loss:** 1. Central Retinal Artery Occlusion (CRAO) – Look for "Cherry Red Spot." 2. Central Retinal Vein Occlusion (CRVO) – Look for "Blood and Thunder" fundus. 3. Vitreous Haemorrhage – Look for "Absent Red Reflex." 4. Retinal Detachment – Look for "Flashers and Floaters" followed by a "curtain falling." * **Gold Standard Investigation for VH:** If the fundus is not visible due to hemorrhage, perform a **B-Scan Ultrasound** to rule out underlying retinal detachment.

Q: In a young patient presenting with recurrent vitreous hemorrhage, what is the most likely diagnosis?

Eale's disease. **Explanation:** The correct answer is **Eale’s disease**. This condition is an idiopathic, inflammatory peripheral perivasculitis (primarily affecting the venules) that typically presents in **young, healthy males** (20–40 years). **Why Eale’s Disease is correct:** The pathogenesis involves three stages: perivascular inflammation (sheathing), peripheral capillary non-perfusion (ischemia), and subsequent **neovascularization**. These fragile new vessels (usually at the junction of perfused and non-perfused retina) easily rupture, leading to **recurrent vitreous hemorrhage**. In the Indian subcontinent, it is frequently associated with hypersensitivity to *Mycobacterium tuberculosis* protein. **Why the other options are incorrect:** * **Central Retinal Vein Occlusion (CRVO):** Typically occurs in older patients with systemic risk factors like hypertension. While it can lead to neovascular glaucoma, it is not the classic cause of recurrent vitreous hemorrhage in the young. * **Proliferative Retinopathy:** While Proliferative Diabetic Retinopathy (PDR) is a major cause of vitreous hemorrhage, it is usually bilateral and associated with a long-standing history of diabetes, rather than being the primary diagnosis for an otherwise healthy young patient. * **Coat’s Disease:** This is a non-inflammatory idiopathic condition characterized by telangiectatic retinal vessels and **massive subretinal exudation** ("lightbulb" appearance). It typically presents as leucocoria in young children, not recurrent vitreous hemorrhage. **High-Yield Clinical Pearls for NEET-PG:** * **Demographic:** Young adult males (20-30s). * **Classic Sign:** Retinal perivascular "sheathing" (candle-wax dripping appearance). * **Association:** Positive Mantoux test is common. * **Management:** Photocoagulation for ischemia/neovascularization; Vitrectomy for non-clearing vitreous hemorrhage.

Q: Coat's disease is characterized by which of the following features?

Treatable with laser photocoagulation. **Explanation:** **Coats’ Disease** is an idiopathic condition characterized by **telangiectatic and aneurysmal retinal vessels** leading to massive subretinal exudation (rich in cholesterol crystals), often resulting in exudative retinal detachment. 1. **Why Option D is Correct:** The primary goal of treatment is to ablate the abnormal, leaking telangiectatic vessels. **Laser photocoagulation** (for posterior lesions) or **cryotherapy** (for peripheral lesions) are the mainstays of treatment to stop the leakage and promote the resorption of subretinal fluid. In advanced cases with total detachment, surgical intervention may be required. 2. **Why Other Options are Incorrect:** * **Option A:** It is **not** equal in sex incidence; it shows a strong **male predilection** (approx. 85% of cases). * **Option B:** The hallmark is **telangiectasia and exudation**, not peripheral neovascularization (which is more characteristic of Eales’ disease or ROP). * **Option C:** It is a **non-hereditary, sporadic** condition. There is no genetic inheritance pattern (unlike Retinoblastoma). **High-Yield Clinical Pearls for NEET-PG:** * **Demographics:** Typically affects **young males** (first decade of life) and is **unilateral** in 90% of cases. * **Clinical Presentation:** Patients often present with **Leukocoria** (white pupillary reflex), making it a crucial differential diagnosis for Retinoblastoma. * **Pathognomonic Feature:** "Lightbulb" aneurysms and massive **hard exudates** (subretinal). * **Imaging:** On CT/MRI, Coats' disease shows high density/signal due to proteinaceous exudate but **lacks the calcification** typically seen in Retinoblastoma.

Q: What is the normal value of the Arden index?

More than 185%. ### Explanation The **Arden Index** (or Arden Ratio) is a quantitative measure derived from the **Electro-oculogram (EOG)**. The EOG measures the standing potential between the cornea (positive) and the retina (negative). This potential is primarily generated by the **Retinal Pigment Epithelium (RPE)** in response to light. **1. Why the Correct Answer is Right:** The Arden Index is calculated as the ratio of the **Light Peak** (maximum potential in light) to the **Dark Trough** (minimum potential in the dark). * **Formula:** (Light Peak / Dark Trough) × 100. * In a healthy eye, the potential should significantly increase when exposed to light. A **normal value is >185%** (or >1.85). Values between 165% and 185% are considered borderline, and values **below 165% are subnormal**. **2. Why the Other Options are Wrong:** * **Options A & B (1 and 1.5):** These values represent a significantly depressed RPE response. A ratio of 1.0 means there was no "light rise" at all, indicating severe RPE dysfunction. * **Option C (Less than 185%):** This range includes subnormal and pathological values. An Arden index below 165% is a hallmark of specific retinal dystrophies. **3. Clinical Pearls for NEET-PG:** * **Best Diagnostic Use:** The EOG is the gold standard for diagnosing **Best’s Vitelliform Macular Dystrophy**. In Best’s disease, the EOG is **abnormal (low Arden index)** even when the Electro-retinogram (ERG) is normal. * **RPE Integrity:** Since the EOG depends on the contact between photoreceptors and the RPE, it is also abnormal in conditions like extensive retinal detachment and Vitamin A deficiency. * **Mnemonic:** "Best's is the Best test for EOG" (though ironically, the EOG result is "bad" in this disease).

Question 1

A 25-year-old male presents with decreased vision in both eyes following a viral illness. On examination, he has mild decrease in visual acuity and paracentral scotomas. Examination of the fundus shows wedge-shaped parafoveal retinal lesions. What is he MOST likely suffering from?

Accepted Answer

Acute Macular Neuroretinopathy

Answer

Serpiginous Choroidopathy

Answer

Birdshot Retinochoroidopathy

Answer

Acute zonal occult outer retinopathy

Question 2

A 70-year-old man presents with deterioration of vision 3 weeks after cataract extraction and intraocular lens implantation. Slit lamp examination shows honeycomb maculopathy and fluorescein angiography shows 'flower petal' hyperfluorescence. What is the most likely diagnosis?

Accepted Answer

Cystoid Macular Edema

Answer

Age-related macular degeneration (ARMD)

Answer

Central Serous Retinopathy (CSR)

Answer

Macular Dystrophy

Question 3

What is the investigation of choice for vitreous hemorrhage?

Accepted Answer

B-Scan

Answer

Ultrasound biomicroscopy

Answer

A-Scan

Answer

OCT

Question 4

Snowball opacities are characteristic findings in which ocular condition?

Accepted Answer

Pars planitis

Answer

Acute anterior uveitis

Answer

Posterior uveitis

Answer

None of the above

Question 5

Anterior vitreous cells are least likely to be found in which of the following conditions?

Accepted Answer

Retinitis pigmentosa

Answer

Cytomegalovirus (CMV) retinitis

Answer

Serpiginous choroidopathy

Answer

Chronic cyclitis

Question 6

Retinoblastoma differs from pseudoglioma by which of the following?

Accepted Answer

Enlargement of the optic foramen

Answer

Decreasing intraocular pressure

Answer

Blurring of vision

Answer

All the above

Question 7

A patient complains of sudden onset blindness without experiencing any pain. What is the likely cause?

Accepted Answer

Vitreous haemorrhage

Answer

Glaucoma

Answer

Cataract

Answer

Age-related macular degeneration

Question 8

In a young patient presenting with recurrent vitreous hemorrhage, what is the most likely diagnosis?

Accepted Answer

Eale's disease

Answer

Central Retinal Vein Occlusion (CRVO)

Answer

Proliferative Retinopathy

Answer

Coat's disease

Question 9

Coat's disease is characterized by which of the following features?

Accepted Answer

Treatable with laser photocoagulation

Answer

Equal sex incidence

Answer

Peripheral neovascularization

Answer

Autosomal dominant inheritance pattern

Question 10

What is the normal value of the Arden index?

Accepted Answer

More than 185%

Answer

1

Answer

1.5

Answer

Less than 185%

Diseases of the Retina — MCQs

Diseases of the Retina — MCQs

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