Diseases of the Retina Practice Questions

Q: Koeppe nodules are typically found on which part of the eye?

Iris. ***Iris*** - **Koeppe nodules** are characteristic inflammatory granulomas found along the **pupillary margin** of the iris. - They are typically seen in **granulomatous uveitis**, particularly in conditions like sarcoidosis or tuberculosis. *Cornea* - The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber. - While corneal changes like **keratic precipitates** can occur in uveitis, **Koeppe nodules** do not develop on the cornea itself. *Conjunctiva* - The conjunctiva is the mucous membrane lining the inner surface of the eyelids and covering the anterior sclera. - Inflammatory conditions of the conjunctiva may present with follicles or papillae, but **Koeppe nodules** are not found here. *Retina* - The retina is the light-sensitive tissue at the back of the eye, responsible for vision. - Retinal involvement in uveitis can lead to vasculitis or macula edema, but **Koeppe nodules** are specific to the iris.

Q: Fluorescein dye study is done to detect:

Retinal vascular pathology. ***Retinal vascular pathology*** - **Fluorescein angiography** is a diagnostic procedure using a fluorescent dye to visualize and study blood flow in the **retinal blood vessels**. - It helps detect and characterize various retinal vascular conditions like **diabetic retinopathy**, **retinal vein occlusions**, and **macular edema**. *Assess retinal vascular conditions in babies* - While fluorescein angiography can be performed in babies, it's generally avoided due to the need for sedation and potential risks, making it less routine than for adult retinal conditions. - The primary purpose is broader than just babies; it's used across all age groups where retinal vascular pathology is suspected. *Macular vascular pathology* - **Macular vascular pathology** is a specific type of retinal vascular pathology, but the dye study assesses the entire retinal vasculature, not just the macula. - Focusing solely on the macula would be an incomplete description of the widespread utility of fluorescein angiography. *Posterior segment of eye* - The **posterior segment** includes structures beyond just the retina, such as the choroid and optic nerve. - While fluorescein angiography provides some information about choroidal circulation, its primary and most detailed application is for evaluating the **retinal vasculature**.

Q: Treatment of choice for clinically significant macular edema in a diabetic is?

Intravitreal anti-VEGF injections. ***Intravitreal anti-VEGF injections*** - **Anti-VEGF agents** (e.g., ranibizumab, aflibercept) are the first-line treatment for **clinically significant diabetic macular edema (DME)** as they effectively reduce vascular leakage and improve vision. - They target **vascular endothelial growth factor (VEGF)**, a key mediator of increased vascular permeability and neovascularization in diabetic retinopathy. *Control of Diabetes* - While essential for preventing the **progression of diabetic retinopathy** and overall health, it is not the primary direct treatment for *existing* clinically significant macular edema. - Good glycemic control can reduce the *risk* of developing DME but does not acutely resolve established edema. *Panretinal Photocoagulation* - **Panretinal photocoagulation (PRP)** is primarily used for **proliferative diabetic retinopathy (PDR)** to ablate ischemic retina and reduce neovascularization. - It is not the treatment of choice for macular edema, as it can sometimes worsen macular function and visual acuity due to treatment-induced damage. *Focal Photocoagulation* - **Focal laser photocoagulation** was historically used for DME, targeting discrete leaking microaneurysms. - While effective for specific focal leakage, it has largely been superseded by **anti-VEGF injections** due to their superior efficacy in diffuse edema and better visual outcomes, especially when edema involves the fovea.

Q: All are seen in non-proliferative diabetic retinopathy except which of the following?

Neovascularization. ***Neovascularization*** - **Neovascularization** signifies the growth of new, fragile blood vessels and is a hallmark feature of **proliferative diabetic retinopathy**, not non-proliferative. - These new vessels can bleed, leading to vitreous hemorrhage and tractional retinal detachment, which are severe complications. *Microaneurysm* - **Microaneurysms** are the earliest clinical sign of diabetic retinopathy, visible as small, red dots on funduscopic examination due to capillary outpouchings. - They are characteristic findings in **non-proliferative diabetic retinopathy (NPDR)**. *Cotton wool spots* - **Cotton wool spots** are soft exudates resulting from microinfarcts in the retinal nerve fiber layer due to occluded precapillary arterioles. - They are findings commonly seen in **non-proliferative diabetic retinopathy (NPDR)**. *Retinal hemorrhages* - **Retinal hemorrhages** (dot-blot hemorrhages) occur when blood leaks from damaged capillaries in the retina. - They are a common occurrence in **non-proliferative diabetic retinopathy (NPDR)**.

Q: First retinal abnormality in diabetic retinopathy is

Microaneurysm. ***Microaneurysm*** - **Microaneurysms** are the **earliest clinically detectable lesions** in diabetic retinopathy, forming as out-pouchings of weakened capillary walls. - They are typically seen as **small, red dots** on funduscopic examination and indicate initial capillary damage. *Hard exudates* - **Hard exudates** represent **lipid and lipoprotein deposits** and indicate leakage from damaged capillaries, usually appearing later than microaneurysms. - They are typically **yellow-white, shiny lesions** with distinct margins, often found in a circinate pattern around leaking vessels. *Soft exudates* - **Soft exudates**, also known as **cotton wool spots**, are microinfarctions of the retinal nerve fiber layer due to capillary occlusion, indicating more severe ischemia. - They appear as **fluffy, white patches** with indistinct borders and are generally a sign of more advanced retinopathy. *Flame-shaped hemorrhages* - **Flame-shaped hemorrhages** occur in the **nerve fiber layer** and typically indicate superficial retinal bleeding, often associated with hypertension. - While common in diabetic retinopathy, they are not the *first* abnormality, as microaneurysms precede them in the disease progression.

Q: A child presents with unilateral white reflex (leukocoria) and raised intraocular pressure, raising suspicion of retinoblastoma. Which of the following investigations is the most appropriate to perform?

Detailed examination under anesthesia. ***Detailed examination under anesthesia*** - A **detailed examination under anesthesia (EUA)** is crucial for accurately assessing the extent of intraocular lesions in children, particularly those with suspected retinoblastoma. It allows for a thorough and precise evaluation of tumor size, location, and multifocality that is otherwise difficult to achieve in an awake child. - EUA often includes fundus photography, ultrasonography, and sometimes anterior segment examination, all performed systematically without the child moving. It is the gold standard for **diagnosing and staging retinoblastoma**. *Ultrasound imaging of the eye* - **Ocular ultrasound** is a key component of the investigation and can help identify the intraocular mass and detect calcifications, which are characteristic of retinoblastoma. - However, ultrasound alone is often insufficient to fully characterize the tumor's extent or for precise staging, and it doesn't replace the need for direct visualization and comprehensive examination. *Measurement of intraocular pressure* - **Raised intraocular pressure** is a symptom that can be present in retinoblastoma but is not a diagnostic tool for the condition itself; it indicates secondary glaucoma due to the tumor. - While important for clinical management, measuring IOP does not directly visualize or characterize the tumor to confirm the diagnosis of retinoblastoma. *CT imaging of the orbit and head* - While **CT imaging** can detect orbital and intracranial extension of retinoblastoma, it involves **ionizing radiation**, which is a significant concern in children, especially those with an increased genetic risk for secondary cancers. - **MRI** is generally preferred over CT for assessing extraocular extension and possible central nervous system involvement due to its superior soft tissue contrast and lack of radiation exposure.

Q: A young patient presents to the ophthalmology clinic with loss of central vision. The electroretinogram (ERG) is normal, but the electrooculogram (EOG) is abnormal. Which of the following is the most likely diagnosis?

Best's vitelliform dystrophy. ***Best's vitelliform dystrophy*** - This condition is characterized by an **abnormal electrooculogram (EOG)** with a normal electroretinogram (ERG). - It primarily affects the retinal pigment epithelium (**RPE**) and leads to **central vision loss** due to macula degeneration. *Stargardt's disease* - Patients typically present with **central vision loss** and a normal ERG, but the **EOG is also normal**, distinguishing it from Best's. - It is caused by mutations in the **ABCA4 gene** and results in progressive macular degeneration. *Retinitis pigmentosa* - This is a progressive degeneration of the **retina's photoreceptors**, leading to **night blindness** and **peripheral vision loss**. - Both the **ERG and EOG are typically abnormal**, reflecting widespread retinal dysfunction. *Cone-rod dystrophy* - This condition is also characterized by progressive **photoreceptor degeneration**, but primarily affecting **cones** more than rods initially, leading to central vision loss and color vision abnormalities. - Both **ERG and EOG would typically be abnormal**, showing reduced cone and rod responses.

Q: Condition where subhyaloid hemorrhage is associated with subarachnoid hemorrhage is what?

Terson's syndrome. ***Terson's syndrome*** - Terson's syndrome is characterized by **intraocular hemorrhage** (e.g., vitreous, subhyaloid, preretinal hemorrhage) associated with **subarachnoid hemorrhage**. - The presumed mechanism involves a sudden increase in **intracranial pressure (ICP)** during subarachnoid hemorrhage, leading to rupture of retinal capillaries or venules. *Posner-Schlossman syndrome* - This syndrome is a recurrent, unilateral **nongranulomatous anterior uveitis** associated with **elevated intraocular pressure**. - It is not directly associated with subarachnoid hemorrhage or subhyaloid bleeding. *Axenfeld-Rieger syndrome* - This is a rare, **autosomal dominant developmental disorder** affecting the anterior segment of the eye, often associated with systemic anomalies. - It can lead to **glaucoma** but does not involve subhyaloid hemorrhage linked to subarachnoid hemorrhage. *Pseudoexfoliation syndrome* - This condition is characterized by the production and deposition of an **extracellular fibrillar material** throughout the anterior segment of the eye. - It is a significant risk factor for **pseudoexfoliation glaucoma** and cataract formation but has no association with subarachnoid hemorrhage.

Q: Which of the following is NOT a feature of Fuchs' Heterochromic Uveitis?

Posterior Synechiae. ***Posterior Synechiae*** - Posterior synechiae, which are **adhesions between the iris and the lens**, are notably absent in Fuchs' heterochromic uveitis. - This is because Fuchs' uveitis is characterized by a **mild, non-granulomatous inflammation** that does not typically lead to the formation of such adhesions. - The **absence of posterior synechiae** is a key distinguishing feature from other forms of chronic anterior uveitis. *Heterochromia* - **Heterochromia** (difference in iris color between the two eyes) is the **defining clinical feature** of this condition and gives it its name. - The affected eye typically shows a **lighter iris color** due to stromal atrophy and loss of pigment. - This feature is present in the majority of cases, though it may be subtle and sometimes only detected on careful examination. *Rubeosis iridis* - **Rubeosis iridis**, or the **formation of fine new blood vessels on the iris surface**, is a characteristic feature of Fuchs' heterochromic uveitis. - These fragile new vessels can lead to **spontaneous hyphema** (blood in the anterior chamber), particularly during intraocular surgery or paracentesis. *Stellate Keratic precipitate* - **Stellate keratic precipitates** (KPs), which are **small, star-shaped deposits** on the corneal endothelium, are a characteristic feature. - These KPs are **fine, diffuse, and scattered** over the entire corneal endothelium, unlike the larger, greasy KPs seen in granulomatous uveitis.

Question 1

Koeppe nodules are typically found on which part of the eye?

Accepted Answer

Iris

Answer

Cornea

Answer

Conjunctiva

Answer

Retina

Question 2

Most common mode of inheritance for retinitis pigmentosa is:

Accepted Answer

Autosomal recessive

Answer

Autosomal dominant

Answer

X-linked

Answer

Mitochondrial inheritance

Question 3

Fluorescein dye study is done to detect:

Accepted Answer

Retinal vascular pathology

Answer

Posterior segment of eye

Answer

Assess retinal vascular conditions in babies

Answer

Macular vascular pathology

Question 4

Treatment of choice for clinically significant macular edema in a diabetic is?

Accepted Answer

Intravitreal anti-VEGF injections

Answer

Control of Diabetes

Answer

Panretinal Photocoagulation

Answer

Focal Photocoagulation

Question 5

All are seen in non-proliferative diabetic retinopathy except which of the following?

Accepted Answer

Neovascularization

Answer

Microaneurysm

Answer

Cotton wool spots

Answer

Retinal hemorrhages

Question 6

First retinal abnormality in diabetic retinopathy is

Accepted Answer

Microaneurysm

Answer

Hard exudates

Answer

Soft exudates

Answer

Flame-shaped hemorrhages

Question 7

A child presents with unilateral white reflex (leukocoria) and raised intraocular pressure, raising suspicion of retinoblastoma. Which of the following investigations is the most appropriate to perform?

Accepted Answer

Detailed examination under anesthesia

Answer

Ultrasound imaging of the eye

Answer

Measurement of intraocular pressure

Answer

CT imaging of the orbit and head

Question 8

A young patient presents to the ophthalmology clinic with loss of central vision. The electroretinogram (ERG) is normal, but the electrooculogram (EOG) is abnormal. Which of the following is the most likely diagnosis?

Accepted Answer

Best's vitelliform dystrophy

Answer

Stargardt's disease

Answer

Retinitis pigmentosa

Answer

Cone-rod dystrophy

Question 9

Condition where subhyaloid hemorrhage is associated with subarachnoid hemorrhage is what?

Accepted Answer

Terson's syndrome

Answer

Posner-Schlossman syndrome

Answer

Pseudoexfoliation syndrome

Answer

Axenfeld-Rieger syndrome

Question 10

Which of the following is NOT a feature of Fuchs' Heterochromic Uveitis?

Accepted Answer

Posterior Synechiae

Answer

Heterochromia

Answer

Rubeosis iridis

Answer

Stellate Keratic precipitate

Diseases of the Retina — MCQs

Diseases of the Retina — MCQs

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