Diseases of the Retina Practice Questions

Q: Waxy pallor of the optic disc is seen in which disease?

Retinitis pigmentosa. The correct answer is **Retinitis pigmentosa (RP)**. ### **Explanation** **Retinitis pigmentosa** is a hereditary dystrophy characterized by the progressive degeneration of photoreceptors (primarily rods). The classic clinical presentation is defined by a **diagnostic triad**: 1. **Waxy pallor of the optic disc:** This occurs due to consecutive optic atrophy resulting from retinal ganglion cell degeneration and glial proliferation (astrocytic gliosis) over the disc surface. 2. **Bony spicule pigmentation:** Pigment migration into the perivascular spaces of the retina, typically in the mid-periphery. 3. **Arteriolar attenuation:** Significant narrowing of the retinal blood vessels. ### **Analysis of Incorrect Options** * **B. Retinopathy of Prematurity (ROP):** Characterized by peripheral neovascularization, fibrovascular proliferation, and tractional retinal detachment. It does not typically cause waxy disc pallor. * **C. Hypertensive Retinopathy:** Features include arteriolar narrowing, AV nipping, flame-shaped hemorrhages, and cotton wool spots. Severe cases (Grade IV) show **papilledema** (swelling), not waxy pallor. * **D. Diabetic Retinopathy:** Characterized by microaneurysms, hard exudates, and neovascularization. While it can lead to optic neuropathy, waxy pallor is not a hallmark feature. ### **NEET-PG High-Yield Pearls** * **Symptoms of RP:** Nyctalopia (night blindness) is the earliest symptom, followed by "ring scotoma" leading to **tubular vision**. * **ERG Findings:** The Electroretinogram (ERG) is **subnormal or extinguished** even in early stages, making it the most sensitive test for diagnosis. * **Associations:** RP is associated with **Posterior Subcapsular Cataract (PSC)**, Cystoid Macular Edema (CME), and Keratoconus. * **Systemic Association:** **Usher syndrome** (RP + Sensorineural hearing loss) is the most common syndromic association.

Q: Select the incorrect statement about this condition?

Associated with vitreous hemorrhage. ***Associated with vitreous hemorrhage*** - **Valsalva retinopathy** causes **preretinal/subhyaloid hemorrhage** or **sub-internal limiting membrane (ILM) hemorrhage**, NOT vitreous hemorrhage. - The blood remains confined to the **retinal layers** and does not extend into the **vitreous cavity**. *Self-resolving* - **Valsalva retinopathy** is typically **self-limiting** and resolves spontaneously over weeks to months. - Most cases do not require intervention as the **preretinal hemorrhage** gradually clears without treatment. *Seen in Valsalva maneuver* - Results from **sudden increase in intrathoracic pressure** during activities like coughing, vomiting, or weight lifting. - The **venous pressure spike** causes rupture of **superficial retinal capillaries** leading to characteristic hemorrhage pattern. *Bleeding profile can be checked* - **Coagulation studies** may be performed to rule out underlying **bleeding disorders** in recurrent cases. - Workup helps exclude systemic causes like **thrombocytopenia** or **coagulopathy** that might predispose to retinal bleeding.

Q: Microaneurysms in diabetic retinopathy are typically found in which retinal layer?

Inner nuclear layer. **Explanation:** Microaneurysms are the **earliest clinically detectable sign** of Diabetic Retinopathy (DR). They represent focal saccular outpouchings of the retinal capillaries, occurring due to the loss of pericytes and basement membrane thickening. **Why the Inner Nuclear Layer (INL) is correct:** The retina has a dual blood supply. The inner layers are supplied by the central retinal artery, which forms two primary capillary networks: 1. **Superficial capillary plexus:** Located in the Nerve Fiber Layer (NFL) or Ganglion Cell Layer (GCL). 2. **Deep capillary plexus:** Located at the junction of the **Inner Nuclear Layer (INL)** and the Outer Plexiform Layer. Microaneurysms predominantly arise from the **venous end** of these deep capillaries located within the **Inner Nuclear Layer**. **Why the other options are incorrect:** * **Outer Nuclear Layer (ONL):** This layer contains the cell bodies of photoreceptors (rods and cones). It is part of the outer retina, which is avascular and relies on the choriocapillaris for nutrition via diffusion. * **Inner Plexiform Layer (IPL):** While the superficial plexus is nearby, the pathological hallmark of microaneurysms is specifically linked to the deeper capillary bed in the INL. * **Outer Plexiform Layer (OPL):** This is the site where **Hard Exudates** (lipid deposits) typically accumulate, but it is not the primary site of microaneurysm formation. **NEET-PG High-Yield Pearls:** * **Earliest Sign of DR:** Microaneurysms (clinically); Loss of pericytes (histologically). * **Dot-Blot Hemorrhages:** Also located in the **Inner Nuclear Layer** (deep retina). * **Flame-shaped Hemorrhages:** Located in the **Nerve Fiber Layer** (superficial retina). * **Investigation of Choice:** Fluorescein Angiography (FFA) shows microaneurysms as tiny "hyperfluorescent" dots.

Q: Asteroid hyalosis bodies are composed of?

Calcium and phosphates. **Explanation:** **Asteroid Hyalosis (Benson’s Disease)** is a common, benign vitreous condition characterized by the presence of numerous small, spherical, white or creamy-white opacities suspended in the vitreous humor. **Why Calcium and Phosphates are correct:** The "asteroid bodies" are biochemically composed of **calcium-containing phospholipids** (specifically calcium hydroxyapatite and complex lipids). These bodies are suspended within the collagen fibrils of the vitreous. Despite their appearance, they are usually asymptomatic and do not significantly impair vision because they move with the vitreous and are not located in the visual axis of the retina. **Why other options are incorrect:** * **Iron:** Accumulation of iron in the eye is known as **Siderosis Bulbi**, usually resulting from a retained intraocular foreign body. It causes toxic damage to the retina and iris (heterochromia), not asteroid bodies. * **Cadmium and Chloride:** These are not physiological or pathological components typically found in vitreous opacities. **High-Yield Clinical Pearls for NEET-PG:** * **Appearance:** Often described as "stars in the night sky" during ophthalmoscopy. * **Movement:** Unlike *Synchysis Scintillans* (which are cholesterol crystals that settle at the bottom), asteroid bodies are attached to vitreous fibrils and **return to their original position** after eye movement. * **Demographics:** Usually unilateral, occurs in older age groups (>60 years), and is associated with Diabetes Mellitus, Hypertension, and Hypercholesterolemia. * **Clinical Significance:** They rarely require treatment (Vitrectomy) unless they interfere with the surgeon's ability to treat underlying retinal pathology. On B-scan ultrasound, they appear as high-amplitude mobile echoes.

Q: What is the most common site for a retinal break?

Upper temporal. **Explanation:** The most common site for a retinal break (tear or hole) is the **upper temporal (superotemporal)** quadrant. **Why Upper Temporal?** The primary mechanism behind retinal breaks is **Vitreoretinal Traction**. The vitreous base is most firmly attached at the ora serrata. Due to the effects of gravity and the anatomical distribution of vitreous liquefaction (synchysis), the vitreous tends to collapse and pull away from the superior retina first. The temporal quadrant is more susceptible than the nasal quadrant because it is more extensive and often undergoes more significant peripheral degenerative changes, such as lattice degeneration. **Analysis of Options:** * **A. Upper temporal (Correct):** Approximately 60% of retinal breaks occur in the superior quadrants, with the superotemporal being the single most frequent site. * **B. Lower temporal:** While common for certain types of retinal dialysis (often traumatic), it is statistically less frequent than the upper temporal quadrant for spontaneous rhegmatogenous breaks. * **C & D. Nasal Quadrants:** These are less common sites because the nasal retina is anatomically shorter and generally experiences less mechanical traction compared to the temporal side. **NEET-PG High-Yield Pearls:** * **Most common type of Retinal Detachment (RD):** Rhegmatogenous RD (caused by a break). * **Most common precursor lesion:** Lattice degeneration (found in ~8% of the population; most common in the superotemporal quadrant). * **Lincoff’s Rules:** These are used to locate the primary retinal break based on the shape of the subretinal fluid. * **Symptom Triad:** Photopsia (flashes), sudden onset of floaters, and a "curtain-like" visual field loss.

Q: What is the most common site of distant metastasis in intraorbital malignant melanoma?

Liver. **Explanation:** **Correct Answer: C. Liver** The liver is the most common site of distant metastasis for uveal (intraocular) melanoma, occurring in approximately **80-90%** of patients with metastatic disease. Unlike most systemic cancers that spread via the lymphatic system, uveal melanoma spreads almost exclusively through the **hematogenous (blood-borne) route**. This is because the uveal tract (iris, ciliary body, and choroid) lacks a formal lymphatic drainage system. Once the tumor cells enter the bloodstream, the liver acts as the primary "filter" and provides a microenvironment highly conducive to the growth of melanoma cells. **Analysis of Incorrect Options:** * **A. Brain:** While melanoma can spread to the CNS, it is a much less frequent site of initial metastasis compared to the liver. * **B. Lung:** The lung is the second most common site of metastasis after the liver, but it rarely occurs in isolation without hepatic involvement. * **D. Lymph Nodes:** Because the intraocular environment lacks lymphatics, regional lymph node involvement is extremely rare. It only occurs if the tumor breaks through the sclera (extraocular extension) and involves the conjunctival lymphatics. **High-Yield Clinical Pearls for NEET-PG:** * **Prognostic Marker:** Monosomy 3 is the most significant genetic predictor of metastatic risk in uveal melanoma. * **Survival:** Once liver metastasis is detected, the prognosis is generally poor, with a median survival of less than 12 months. * **Monitoring:** Patients with uveal melanoma require lifelong systemic surveillance, typically involving periodic Liver Function Tests (LFTs) and abdominal imaging (Ultrasound or MRI). * **Differential:** In contrast to uveal melanoma, **conjunctival melanoma** spreads primarily via the lymphatics to the preauricular and submandibular nodes.

Q: Which of the following is NOT a feature of retinal detachment?

Anterior uveitis with vitreous hemorrhage. **Explanation:** Retinal Detachment (RD), specifically the rhegmatogenous type, occurs when a break in the retina allows fluid to enter the subretinal space, separating the neurosensory retina from the underlying retinal pigment epithelium (RPE). **Why Option C is the correct answer:** While **vitreous hemorrhage** can be associated with retinal tears (due to the rupture of a peripheral vessel), **Anterior Uveitis** is not a standard feature of RD. In fact, RD is typically associated with **low intraocular pressure (hypotony)** and a quiet anterior chamber. If inflammation is present, it is usually mild (Schwartz-Matsuo syndrome). The combination of anterior uveitis and vitreous hemorrhage points more toward inflammatory conditions or trauma rather than a primary RD. **Analysis of incorrect options:** * **A. Field defect:** Patients frequently complain of a "curtain falling" over their vision. The location of the visual field defect is always **opposite** to the site of the detachment. * **B. Retinal tears:** These are the primary cause of Rhegmatogenous RD. Traction from the vitreous (PVD) leads to tears or holes, allowing liquefied vitreous to seep under the retina. * **D. Greyish-brown fundus:** On ophthalmoscopy, the detached retina loses its transparency and appears **pearly grey, opaque, and wrinkled**. It undulates with eye movements. **High-Yield Clinical Pearls for NEET-PG:** * **Shafer’s Sign:** The presence of "tobacco dust" (pigment cells) in the anterior vitreous is pathognomonic for a retinal tear. * **Symptoms:** Photopsia (flashes), floaters, and sudden painless field loss. * **Management:** The gold standard is surgery (Scleral buckling, Pneumatic retinopexy, or Pars Plana Vitrectomy) to seal the break.

Q: Disc oedema is seen in which of the following conditions?

Central Retinal Vein Occlusion (CRVO). **Explanation:** **1. Why Option A is Correct:** Central Retinal Vein Occlusion (CRVO) occurs due to a thrombus at the level of the lamina cribrosa. Because the central retinal vein is the primary drainage system for the entire retina, its obstruction leads to a massive backup of blood and high hydrostatic pressure. This results in the classic **"Blood and Thunder" fundus**, characterized by widespread retinal hemorrhages, dilated tortuous veins, and significant **disc edema**. The disc swelling occurs because the venous congestion affects the optic nerve head's vascular supply and drainage. **2. Why Other Options are Incorrect:** * **CRAO (Option B):** This is an arterial ischemic event. The hallmark is a "pale, milky-white retina" with a **"Cherry Red Spot"** at the macula. The disc is usually normal in the acute phase and eventually becomes pale (optic atrophy); it is not edematous. * **BRVO (Option C):** Obstruction occurs in a branch vein (usually at an AV crossing). Hemorrhages and edema are localized to a specific **quadrant** of the retina. While macular edema is common, generalized disc edema is not a feature unless the occlusion is extremely close to the disc. * **BRAO (Option D):** This causes localized retinal ischemia and whitening in the distribution of the affected artery. It does not cause disc edema. **Clinical Pearls for NEET-PG:** * **CRVO Triad:** Disc edema, massive retinal hemorrhages, and cotton wool spots. * **CRAO Key Sign:** Cherry red spot (due to the thin fovea showing the underlying vascular choroid against the pale, ischemic retina). * **Neovascular Glaucoma (NVG):** A dreaded complication of ischemic CRVO, often occurring around 90 days post-occlusion (**"100-day glaucoma"**). * **Disc Edema vs. Papilledema:** Remember that "Papilledema" is specifically disc edema caused by *increased intracranial pressure* and is almost always bilateral. CRVO causes unilateral disc edema.

Q: Amaurosis fugax is caused by occlusion of which artery?

Central retinal artery. **Explanation:** **Amaurosis fugax** refers to a sudden, painless, and transient loss of vision in one eye, often described by patients as a "curtain falling" over the field of vision. **Why the Correct Answer is Right:** The underlying mechanism is a temporary reduction in blood flow to the retina. It is most commonly caused by an **embolus** (Hollenhorst plaque) originating from an atherosclerotic carotid artery. This embolus travels through the internal carotid artery and ophthalmic artery to cause transient occlusion of the **Central Retinal Artery (CRA)**. Since the CRA is an end-artery supplying the inner layers of the retina, its occlusion leads to immediate ischemia and vision loss until the embolus dissolves or moves distally. **Why the Incorrect Options are Wrong:** * **A. Facial artery:** A branch of the external carotid artery (ECA) that supplies the muscles and skin of the face; it does not supply the retina. * **B. Occipital artery:** A branch of the ECA supplying the posterior scalp and neck muscles. * **D. Posterior auricular artery:** A branch of the ECA supplying the scalp behind the ear and the auricle. **Clinical Pearls for NEET-PG:** * **Hollenhorst Plaques:** These are bright, refractive cholesterol emboli seen at retinal artery bifurcations during fundoscopy. * **Warning Sign:** Amaurosis fugax is a "TIA of the eye" and is a significant warning sign for an impending **Cerebrovascular Accident (Stroke)**. * **Investigation of Choice:** Carotid Doppler (to check for carotid artery stenosis). * **Differential Diagnosis:** Must be distinguished from Giant Cell Arteritis (GCA) in elderly patients.

Q: A 30-year-old male presents with a 15-day history of unilateral blurred vision and floaters. Examination reveals anterior chamber flare and cells, and a 'headlight in fog' appearance on indirect ophthalmoscopy. A single inflammatory focus of fluffy retinochoroiditis is also observed. What is the diagnosis?

Toxoplasmosis chorioretinitis. **Explanation:** The clinical presentation is classic for **Ocular Toxoplasmosis**, the most common cause of posterior uveitis worldwide. **1. Why Toxoplasmosis is Correct:** The hallmark sign described, **'Headlight in fog'**, refers to an active focus of fluffy, white-yellow **necrotizing retinochoroiditis** seen through a dense vitreous inflammatory haze (vitritis). In a 30-year-old, this is often a recurrence of congenital infection. The presence of anterior chamber flare and cells (iridocyclitis) is a common "neighbor reaction" to the posterior segment inflammation. **2. Why Other Options are Incorrect:** * **CMV Retinitis:** Typically occurs in immunocompromised patients (CD4 <50). It presents with minimal vitritis (no "fog") and a "pizza-pie" or "crushed tomato" appearance (hemorrhage and necrosis), not a single fluffy focus. * **Toxocariasis:** Usually presents in children as a solitary white elevated granuloma (macular or peripheral) or endophthalmitis, but lacks the characteristic recurrent retinochoroiditis pattern. * **Sarcoidosis:** Characterized by "mutton-fat" KPs, "string of pearls" vitreous opacities, and "candle-wax drippings" (periphlebitis), rather than a focal necrotizing retinitis. **Clinical Pearls for NEET-PG:** * **Primary site of infection:** The **retina** is the primary site (Toxoplasma is an obligate intracellular parasite); the choroid is involved secondarily. * **Classic Lesion:** An active lesion often appears adjacent to an old, pigmented **"punched-out" chorioretinal scar** (Satellite lesion). * **Treatment:** The "Triple Therapy" includes Pyrimethamine, Sulfadiazine, and Folinic acid. Steroids are added *only after* starting anti-parasitics to reduce inflammation.

Question 1

Waxy pallor of the optic disc is seen in which disease?

Accepted Answer

Retinitis pigmentosa

Answer

Retinopathy of prematurity

Answer

Hypertensive retinopathy

Answer

Diabetic retinopathy

Question 2

Select the incorrect statement about this condition?

Accepted Answer

Associated with vitreous hemorrhage

Answer

Self-resolving

Answer

Seen in Valsalva maneuver

Answer

Bleeding profile can be checked

Question 3

Microaneurysms in diabetic retinopathy are typically found in which retinal layer?

Accepted Answer

Inner nuclear layer

Answer

Outer nuclear layer

Answer

Inner plexiform layer

Answer

Outer plexiform layer

Question 4

Asteroid hyalosis bodies are composed of?

Accepted Answer

Calcium and phosphates

Answer

Iron

Answer

Cadmium and chloride

Answer

None of the above

Question 5

What is the most common site for a retinal break?

Accepted Answer

Upper temporal

Answer

Lower temporal

Answer

Upper nasal

Answer

Lower nasal

Question 6

What is the most common site of distant metastasis in intraorbital malignant melanoma?

Accepted Answer

Liver

Answer

Brain

Answer

Lung

Answer

Lymph nodes

Question 7

Which of the following is NOT a feature of retinal detachment?

Accepted Answer

Anterior uveitis with vitreous hemorrhage

Answer

Field defect

Answer

Retinal tears

Answer

Greyish-brown fundus

Question 8

Disc oedema is seen in which of the following conditions?

Accepted Answer

Central Retinal Vein Occlusion (CRVO)

Answer

Central Retinal Artery Occlusion (CRAO)

Answer

Branch Retinal Vein Occlusion (BRVO)

Answer

Branch Retinal Artery Occlusion (BRAO)

Question 9

Amaurosis fugax is caused by occlusion of which artery?

Accepted Answer

Central retinal artery

Answer

Facial artery

Answer

Occipital artery

Answer

Posterior auricular artery

Question 10

A 30-year-old male presents with a 15-day history of unilateral blurred vision and floaters. Examination reveals anterior chamber flare and cells, and a 'headlight in fog' appearance on indirect ophthalmoscopy. A single inflammatory focus of fluffy retinochoroiditis is also observed. What is the diagnosis?

Accepted Answer

Toxoplasmosis chorioretinitis

Answer

Cytomegalovirus retinitis

Answer

Toxocariasis

Answer

Sarcoidosis

Diseases of the Retina — MCQs

Diseases of the Retina — MCQs

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