Diseases of the Retina Practice Questions

Q: Anterior uveitis earliest lesion ?

Aqueous flare. ***Aqueous flare*** - **Aqueous flare** represents the earliest lesion in anterior uveitis due to increased protein content in the anterior chamber, causing light scattering. - This increased protein is a result of **breakdown of the blood-aqueous barrier** and leakage from inflamed ciliary body capillaries. *Keratic precipitates* - **Keratic precipitates (KPs)** are inflammatory cells that adhere to the corneal endothelium, forming later in the disease process. - While characteristic of uveitis, they are not the *earliest* sign of the inflammatory response within the aqueous humor itself. *Circumcorneal congestion* - **Circumcorneal congestion**, also known as ciliary flush, indicates inflammation of the anterior segment of the eye, particularly the ciliary body. - Although an early sign, it is a vascular response and follows the subtle, microscopic changes of protein leakage that constitute aqueous flare. *Blurring of vision* - **Blurring of vision** is a symptom reported by the patient and is a consequence of the inflammatory process (e.g., cell/protein accumulation, corneal edema, iris spasm). - It is not a direct anatomical or physiological lesion but rather a functional impairment resulting from the underlying inflammation.

Q: Most common primary intraocular neoplasm in a child is?

Retinoblastoma. ***Retinoblastoma*** - **Retinoblastoma** is the **most common primary intraocular malignancy in children**, typically presenting before the age of 5. - It arises from **immature retinal cells** and can be inherited (germline mutation) or sporadic. *Metastasis* - **Metastasis** to the eye is rare in children and is typically associated with advanced, widespread cancers from other primary sites. - While possible, it is not considered the primary intraocular neoplasm of highest incidence in this age group. *Basal cell carcinoma* - **Basal cell carcinoma** is a **skin cancer** that rarely occurs in children and almost exclusively affects sun-exposed areas like the eyelids, not primarily intraocular structures. - It is an **epithelial tumor** and does not originate from intraocular tissues. *Squamous cell carcinoma* - **Squamous cell carcinoma** is another type of **skin cancer**, more common in older adults with significant UV exposure, and is exceedingly rare as a primary intraocular tumor, especially in children. - Like basal cell carcinoma, it primarily affects the skin, including the eyelids, rather than the internal eye.

Q: In which type of retinal detachment are retinal tears most commonly observed?

Rhegmatogenous retinal detachment. ***Rhegmatogenous retinal detachment*** - This type of detachment is characterized by a **full-thickness break or tear** in the neurosensory retina, allowing vitreous fluid to pass into the subretinal space. - The term "rhegma" itself is derived from the Greek word for **tear or rupture**, directly indicating the presence of retinal tears. *Secondary retinal detachment* - This is a broad category that encompasses both exudative and tractional retinal detachments, which do not primarily involve retinal tears. - It refers to any retinal detachment that is not rhegmatogenous, meaning the underlying cause is not a retinal break. *Tractional retinal detachment* - This type occurs when **fibrovascular membranes** on the retinal surface contract, pulling the retina away from the underlying retinal pigment epithelium. - While it can lead to retinal tears in some cases, the primary mechanism is **traction**, not a spontaneous tear. *Exudative retinal detachment* - This is caused by the accumulation of **serous fluid** under the retina due to inflammation, vascular leakage, or tumors, without the presence of retinal breaks. - There is no direct involvement of retinal tears; the detachment is due to **fluid accumulation** from compromised retinal or choroidal vessels.

Q: 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?

Pan-retinal photocoagulation. ***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**.

Q: What conditions can the photostress test help differentiate between?

Macular and optic nerve diseases. ***Macular and optic nerve diseases*** - The **photostress test** assesses the functional recovery of the macula after exposure to bright light. - Patients with **macular dysfunction** will experience a prolonged recovery time of **visual acuity** (>60 seconds) compared to those with **optic nerve disease** or normal eyes, where recovery is typically faster. *Retinal and optic nerve diseases* - While the photostress test differentiates macular (a part of the retina) from optic nerve disease, "retinal diseases" is too broad, as it includes peripheral retinal conditions not directly assessed by macular function. - **Peripheral retinal diseases** may not significantly impact the photostress recovery time, making this option less precise. *Cataract and retinal diseases* - The photostress test is not primarily designed to differentiate between **cataracts** and **retinal diseases**. - **Cataracts** cause generalized reduced vision but do not typically prolong **photostress recovery** unless a significant **macular pathology** is co-existent. *Vitreous and optic nerve diseases* - **Vitreous opacities** or **hemorrhages** can cause scattered light and reduced vision, but they do not specifically prolong **macular recovery** after photostress in the same way **macular degeneration** does. - The test focuses on **photoreceptor recovery**, which is not directly affected by the vitreous.

Q: Which chemotherapy agents are commonly used for the treatment of retinoblastoma?

vincristine, carboplatin and etoposide. ***Vincristine, carboplatin and etoposide*** - This combination is a well-established and commonly used **chemotherapy regimen** for the systemic treatment of retinoblastoma, particularly when there is significant intraocular disease or extraocular extension. - **Vincristine** targets microtubules, **carboplatin** is an alkylating agent, and **etoposide** is a topoisomerase inhibitor, working together to achieve a synergistic antineoplastic effect. *Vinblastine, etoposide and bleomycin* - While etoposide is used, **vinblastine** is not a primary agent for retinoblastoma, and **bleomycin** is more commonly associated with germ cell tumors or lymphomas, not retinoblastoma. - This combination lacks the broad spectrum of activity and specific targeting for retinoblastoma that is present in the standard regimen. *Vinblastine, vincristine and etoposide* - Although vincristine and etoposide are used, **vinblastine** is not typically included in the first-line systemic chemotherapy for retinoblastoma. - The absence of a platinum agent like carboplatin would make this regimen less effective for retinoblastoma, which often requires a strong alkylating agent. *Vinblastine, vincristine and cisplatin* - While vincristine is appropriate, **vinblastine** is not a standard component, and **cisplatin** is an alkylating agent but **carboplatin** is generally preferred in retinoblastoma due to its similar efficacy and a more favorable toxicity profile, especially regarding nephrotoxicity. - The use of cisplatin can lead to more significant **renal toxicity** and potentially ototoxicity compared to carboplatin, which is often avoided in a pediatric population when alternatives exist.

Q: Which of the following statements is false regarding Eale's disease?

Optic neuritis. ***Correct Answer: Optic neuritis*** - This statement is **false** because **Eale's disease** is a **peripheral retinal vasculitis** (periphlebitis) that primarily affects the **peripheral retinal veins**. - The condition does **NOT involve the optic nerve**, and **optic neuritis is NOT a recognized feature or complication** of Eale's disease. - The disease process is confined to the retinal vasculature and does not extend anteriorly to involve the optic disc or nerve in typical cases. *AKT is given* - While the exact etiology of Eale's disease remains uncertain, there is a **historical and clinical association with tuberculosis**, particularly in TB-endemic regions like India. - In clinical practice, **anti-tubercular therapy (ATT/AKT) is often empirically administered** when TB cannot be ruled out or when there is suspicion of systemic TB. - Some studies suggest ATT may help reduce inflammation and prevent recurrence in selected cases. *Vitreous Hemorrhage* - This is a **hallmark complication** of Eale's disease, particularly in stage 3 (proliferative stage). - **Recurrent vitreous hemorrhage** occurs due to rupture of fragile neovascular vessels that form in response to retinal ischemia. - It is one of the most common presentations requiring intervention. *Retinal detachment may occur* - **Tractional retinal detachment** is a recognized complication resulting from contraction of **fibrovascular proliferative membranes**. - **Rhegmatogenous retinal detachment** can also occur if vitreoretinal traction causes retinal breaks. - Both types may require surgical intervention (vitrectomy).

Q: All of the following are true for sympathetic ophthalmitis except which of the following?

Affects the injured eye. ***Affects the injured eye*** - Sympathetic ophthalmia is a **bilateral, granulomatous panuveitis** that characteristically affects the **fellow, uninjured eye** (sympathizing eye) following trauma or surgery to the other eye (exciting eye). - The disease involves an immune response directed against ocular antigens, typically from the uveal tissue, in the uninjured eye. *Mostly results from a penetrating wound* - This statement is true; **penetrating ocular trauma** (e.g., from surgery or injury) is the most common trigger for sympathetic ophthalmia. - The exposure of uveal antigens from the injured eye initiates an autoimmune response. *Autoimmune etiology* - This statement is true; sympathetic ophthalmia is an **autoimmune disease** mediated by T-lymphocytes against uveal antigens. - The condition is characterized by a delayed hypersensitivity reaction against exposed uveal proteins. *Dalen Fuch's nodules may be seen* - This statement is true; **Dalen-Fuchs nodules** are characteristic histopathological findings in sympathetic ophthalmia. - These are accumulations of epithelioid cells and lymphocytes located between the retinal pigment epithelium and Bruch's membrane.

Q: What is the typical appearance of a subhyaloid hemorrhage in the eye?

Boat shaped. ***Boat shaped*** - A subhyaloid hemorrhage is located beneath the **hyaloid membrane** (the posterior vitreous cortex), which is attached to the retina. - The collected blood often assumes a **dependent, gravity-influenced shape**, appearing flat on top and curved underneath, resembling a boat. *Crescent shaped* - This shape is not characteristic of a typical subhyaloid hemorrhage; it might be seen in other types of hemorrhages or detachment patterns. - **Crescentic shapes** are more commonly associated with certain types of **retinal detachments** or tears where fluid accumulation takes on a curved boundary. *Round* - While hemorrhages can be round, a subhyaloid hemorrhage typically spreads out due to gravity within the confined space, resulting in a more distinct shape. - A **perfectly round hemorrhage** is less common in the subhyaloid space as blood tends to layer out rather than remain as a sphere. *Flame shaped* - **Flame-shaped hemorrhages** are typically found in the **nerve fiber layer** due to the orientation of nerve fibers. - These hemorrhages are shallower and follow the linear arrangement of nerve fibers, unlike the larger, more globular subhyaloid bleeds.

Question 1

Anterior uveitis earliest lesion ?

Accepted Answer

Aqueous flare

Answer

Keratic precipitates

Answer

Circumcorneal congestion

Answer

Blurring of vision

Question 2

Most common primary intraocular neoplasm in a child is?

Accepted Answer

Retinoblastoma

Answer

Metastasis

Answer

Basal cell carcinoma

Answer

Squamous cell carcinoma

Question 3

In which type of retinal detachment are retinal tears most commonly observed?

Accepted Answer

Rhegmatogenous retinal detachment

Answer

Secondary retinal detachment

Answer

Tractional retinal detachment

Answer

Exudative retinal detachment

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?

Accepted Answer

Pan-retinal photocoagulation

Answer

Focal laser photocoagulation

Answer

Grid laser photocoagulation

Answer

Scleral buckling

Question 5

What is the primary cause of exudative retinal detachment?

Accepted Answer

Inflammation and vascular abnormalities leading to fluid accumulation beneath the retina.

Answer

Traction on the retina causing detachment.

Answer

Retinal tear leading to fluid accumulation.

Answer

Fluid accumulation due to Coats' disease.

Question 6

What conditions can the photostress test help differentiate between?

Accepted Answer

Macular and optic nerve diseases

Answer

Retinal and optic nerve diseases

Answer

Cataract and retinal diseases

Answer

Vitreous and optic nerve diseases

Question 7

Which chemotherapy agents are commonly used for the treatment of retinoblastoma?

Accepted Answer

vincristine, carboplatin and etoposide

Answer

vinblastine, etoposide and bleomycin

Answer

vinblastine, vincristine and etoposide

Answer

vinblastine, vincristine and cisplatin

Question 8

Which of the following statements is false regarding Eale's disease?

Accepted Answer

Optic neuritis

Answer

AKT is given

Answer

Vitreous Hemorrhage

Answer

Retinal detachment may occur

Question 9

All of the following are true for sympathetic ophthalmitis except which of the following?

Accepted Answer

Affects the injured eye

Answer

Mostly results from a penetrating wound

Answer

Autoimmune etiology

Answer

Dalen-Fuchs nodules may be seen

Question 10

What is the typical appearance of a subhyaloid hemorrhage in the eye?

Accepted Answer

Boat shaped

Answer

Crescent shaped

Answer

Round

Answer

Flame shaped

Diseases of the Retina — MCQs

Diseases of the Retina — MCQs

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