Diseases of the Retina Practice Questions

Q: Keith Wagener classification is for?

Hypertensive retinopathy. ***Hypertensive retinopathy*** - The **Keith-Wagner classification** (or Keith-Wagener-Barker classification) is a historical grading system used to describe the severity of **hypertensive retinopathy**. - It categorizes retinal changes into four grades based on findings like **arteriolar narrowing**, **hemorrhages**, **exudates**, and **papilledema**, correlating them with the patient's prognosis. *Diabetic maculopathy* - **Diabetic maculopathy** is classified using systems like the ETDRS (Early Treatment Diabetic Retinopathy Study) criteria, focusing on the presence of **edema**, **exudates**, and **ischemia** in the macula. - While both relate to vascular damage, the specific classifications and features differ significantly. *CRVO* - **Central Retinal Vein Occlusion (CRVO)** is typically classified based on its **ischemic** or **non-ischemic** status, determined by fluorescein angiography and visual acuity. - The Keith-Wagner classification is not used for grading CRVO. *CRAO* - **Central Retinal Artery Occlusion (CRAO)** is primarily diagnosed by the sudden, profound vision loss and retinal whitening, often with a **cherry-red spot** on the macula. - There isn't a widely used grading classification system for CRAO analogous to Keith-Wagner.

Q: Which part of the eye is primarily affected by Abetalipoproteinemia?

Retina. ***Retina*** - Abetalipoproteinemia leads to a severe deficiency of **fat-soluble vitamins**, especially **vitamin A** and **vitamin E**, which are crucial for retinal health. - This deficiency causes a progressive **retinopathy**, particularly affecting the photoreceptors, leading to **night blindness** and eventual loss of central vision. *Retinal pigment epithelium* - While the **retinal pigment epithelium (RPE)** supports photoreceptor function, the primary and most significant damage in abetalipoproteinemia directly impacts the photoreceptors of the retina itself. - Although the RPE can be secondarily affected due to photoreceptor degeneration, it is not the initial or primary site of pathology. *Choroid* - The **choroid** is a vascular layer that provides oxygen and nutrients to the outer retina, but it is not directly affected by the vitamin deficiencies in abetalipoproteinemia. - Damage to the choroid is not a characteristic feature of this disease. *Optic nerve* - The **optic nerve** transmits visual information from the retina to the brain, and while severe retinal damage can eventually compromise its function, it is not the primary site of pathology in abetalipoproteinemia. - The initial and most direct impact of the vitamin deficiencies is on the retina.

Q: What is a common symptom associated with vitreous hemorrhage?

Sudden loss of vision without pain. ***Sudden loss of vision without pain*** - **Vitreous hemorrhage** often presents as an acute, **painless loss of vision** due to blood obscuring the light path to the retina. - Patients may describe **floaters**, **cobwebs**, or a **reddish tint** to their vision, indicating blood in the vitreous cavity. *Sudden loss of vision with pain* - **Sudden vision loss with pain** is more characteristic of conditions like **acute angle-closure glaucoma** or **optic neuritis**. - Vitreous hemorrhage itself is not typically associated with ocular pain unless there's an underlying painful condition like **neovascular glaucoma**. *Gradual loss of vision with pain* - **Gradual vision loss with pain** is rare and not typical for vitreous hemorrhage. - Painful, gradual vision loss might suggest chronic inflammatory conditions or certain **orbital pathologies**. *Gradual loss of vision without pain* - **Gradual, painless vision loss** is often seen in conditions like **cataracts**, **chronic open-angle glaucoma**, or **diabetic retinopathy without acute hemorrhage**. - Vitreous hemorrhage usually manifests with a more acute onset of symptoms.

Q: Retinoblastoma can occur bilaterally in what percentage of cases?

25-30%. ***25-30%*** - Approximately **25-30%** of retinoblastoma cases are **bilateral**, which is typically associated with the **germline (heritable)** form of the disease. - Patients with bilateral retinoblastoma are at higher risk for **second primary cancers** later in life. *10-15%* - This percentage is too low; **bilateral retinoblastoma** occurs more frequently than this. - A lower incidence of bilateral cases would suggest a stronger predominance of the **sporadic (non-heritable) form**. *15-20%* - This percentage does not accurately reflect the established prevalence of **bilateral retinoblastoma**. - While it's within the range of bilateral occurrences, it underestimates the true frequency. *20-25%* - While closer, this range still slightly underestimates the actual proportion of **bilateral retinoblastoma cases**. - The higher range accounts for cases arising from new germline mutations in addition to inherited ones.

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: Recurrent non-granulomatous uveitis is seen in:

Posner-Schlossman syndrome. ***Posner-Schlossman syndrome*** - Also known as **glaucomatocyclitic crisis**, this syndrome is characterized by recurrent attacks of **unilateral acute non-granulomatous anterior uveitis** with significantly **elevated intraocular pressure**. - The inflammation is typically mild and transient, without posterior synechiae or significant vision loss, but the recurrent nature and association with high IOP are key features. *Vogt-Koyanagi-Harada syndrome* - This is a **granulomatous panuveitis** associated with neurological, auditory, and dermatological manifestations, which is distinct from the non-granulomatous and recurrent nature described. - It is an autoimmune disorder that affects melanin-containing tissues, leading to symptoms like **vitiligo**, **poliosis**, and **hearing loss** in addition to the uveitis. *Tuberculosis* - Ocular tuberculosis can cause various forms of uveitis, but it typically presents as a **granulomatous uveitis**, which contradicts the "non-granulomatous" description in the question. - It is often associated with systemic tuberculosis, and diagnosis requires evidence of mycobacterial infection. *Sarcoidosis* - Ocular sarcoidosis commonly manifests as a **granulomatous uveitis**, often with characteristic "mutton-fat" keratic precipitates and possibly **posterior uveitis** or **vasculitis**. - Like tuberculosis, its granulomatous nature distinguishes it from the non-granulomatous presentation in the question.

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**.

Question 1

Keith Wagener classification is for?

Accepted Answer

Hypertensive retinopathy

Answer

CRVO

Answer

CRAO

Answer

Diabetic maculopathy

Question 2

Which part of the eye is primarily affected by Abetalipoproteinemia?

Accepted Answer

Retina

Answer

Retinal pigment epithelium

Answer

Choroid

Answer

Optic nerve

Question 3

What is a common symptom associated with vitreous hemorrhage?

Accepted Answer

Sudden loss of vision without pain

Answer

Sudden loss of vision with pain

Answer

Gradual loss of vision with pain

Answer

Gradual loss of vision without pain

Question 4

Retinoblastoma can occur bilaterally in what percentage of cases?

Accepted Answer

25-30%

Answer

15-20%

Answer

10-15%

Answer

20-25%

Question 5

Anterior uveitis earliest lesion ?

Accepted Answer

Aqueous flare

Answer

Keratic precipitates

Answer

Circumcorneal congestion

Answer

Blurring of vision

Question 6

Most common primary intraocular neoplasm in a child is?

Accepted Answer

Retinoblastoma

Answer

Metastasis

Answer

Basal cell carcinoma

Answer

Squamous cell carcinoma

Question 7

Recurrent non-granulomatous uveitis is seen in:

Accepted Answer

Posner-Schlossman syndrome

Answer

Vogt-Koyanagi-Harada syndrome

Answer

Tuberculosis

Answer

Sarcoidosis

Question 8

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 9

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 10

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.

Diseases of the Retina — MCQs

Diseases of the Retina — MCQs

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