Diseases of the Retina Practice Questions

Q: A patient with a history of myopia presents with new floaters and flashes of light. Fundoscopy reveals a retinal tear. What is the initial management?

Laser photocoagulation. ***Laser photocoagulation*** - **Laser photocoagulation** is the **preferred initial management** for a **retinal tear** without retinal detachment, as it creates a chorioretinal adhesion around the tear, preventing fluid from passing through. - This procedure aims to seal the edges of the tear, thereby **preventing progression to retinal detachment**. - It is **preferred** due to its **precision, minimal inflammation, and ability to treat posterior tears** with excellent visualization. *Vitrectomy* - **Vitrectomy** is generally reserved for more complex cases, such as **retinal detachment with vitreous hemorrhage** or significant vitreous traction. - It involves removing the vitreous gel, which is a more invasive procedure than laser photocoagulation. *Scleral buckle* - A **scleral buckle** is typically used to repair a **retinal detachment** by indenting the sclera and bringing the choroid into contact with the detached retina. - It is not the primary treatment for an isolated retinal tear without detachment. *Cryotherapy* - **Cryotherapy** is an **alternative** to laser photocoagulation for **retinal tears**, especially useful when the view to the tear is obstructed, for **anterior peripheral tears**, or when laser equipment is unavailable. - While equally effective at creating chorioretinal adhesion, laser photocoagulation is **more commonly used** in modern practice due to better control, less inflammation, and superior results for posterior tears.

Q: What is the primary function of the macula in terms of visual field?

Central vision. ***Central vision*** - The **macula** is a small, specialized area within the retina responsible for **sharp, detailed central vision** necessary for tasks like reading and recognizing faces. - It has a high concentration of **cone photoreceptors**, which are essential for high-acuity vision in the **central visual field**. - The macula, particularly the **fovea centralis**, provides the highest visual acuity in the retina. *Peripheral vision* - Peripheral vision detects objects and movement outside the direct line of sight and is primarily mediated by the **peripheral retina** with its rod photoreceptors. - Damage to the macula typically spares peripheral vision, whereas damage to the peripheral retina affects this type of vision. - Conditions like **age-related macular degeneration** demonstrate how macular damage causes central vision loss while preserving peripheral vision. *Night vision* - **Night vision** is primarily mediated by **rod photoreceptors**, which are highly sensitive to low light levels. - The macula is dominated by **cone photoreceptors**, which function best in bright light conditions (photopic vision). - Rods are concentrated in the peripheral retina, not the macula. *Color vision* - While **color vision** is indeed mediated by **cone photoreceptors** concentrated in the macula, this is a **functional characteristic** rather than a **spatial/field function**. - The question asks about the macula's role in terms of visual field distribution, where it specifically serves **central vision**. - Color perception occurs throughout the visual field wherever cones are present, though it's most acute in the macula.

Q: Cotton wool spots on fundoscopic examination are characteristically seen in all of the following EXCEPT:

Glaucoma. ***Glaucoma*** - Glaucoma is characterized by **optic nerve damage** with **optic disc cupping** and **pallor**, along with visual field defects. - **Cotton wool spots are NOT a feature** of glaucoma; the primary pathology involves elevated intraocular pressure causing optic neuropathy. - Fundoscopic findings include increased **cup-to-disc ratio** (>0.5), vertical elongation of the cup, and **RNFL defects**. *Hypertensive retinopathy* - Cotton wool spots are a hallmark of **grade III-IV hypertensive retinopathy**, resulting from **ischemic infarction** of the nerve fiber layer. - They appear as **white, fluffy patches** and indicate severe hypertension with arteriolar occlusion. - Associated with flame-shaped hemorrhages, arteriovenous nicking, and copper/silver wiring. *Diabetic retinopathy* - Cotton wool spots are commonly seen in **severe NPDR and PDR**, indicating **capillary non-perfusion** and ischemia. - They result from **focal retinal ischemia** due to microvascular occlusion from chronic hyperglycemia. - Other features include microaneurysms, dot-blot hemorrhages, hard exudates, and neovascularization. *Retinal detachment* - **Central retinal vein occlusion (CRVO)**, which can lead to retinal detachment, classically presents with cotton wool spots. - Cotton wool spots can be seen in **ischemic CRVO** along with extensive retinal hemorrhages ("blood and thunder" appearance). - True rhegmatogenous retinal detachment presents with flashes, floaters, and visual field defects but may have preceding vascular changes.

Q: A 70-year-old man presents with gradual, painless vision loss and a history of smoking. What is the most likely diagnosis?

Age-related macular degeneration. ***Age-related macular degeneration*** - **Gradual, painless vision loss** in an older individual, especially with a history of **smoking**, is highly suggestive of **age-related macular degeneration** (AMD) - AMD specifically affects the **macula**, leading to loss of **central vision** and difficulty with tasks like reading and recognizing faces - **Smoking is the most significant modifiable risk factor** for developing AMD *Cataracts* - While cataracts also cause gradual, painless vision loss and are common in older adults, they typically present with **cloudy or blurry vision**, problems with glare, and reduced night vision - Smoking is a risk factor for cataracts, but the specific pattern of **central vision loss** points more strongly to AMD *Glaucoma* - Glaucoma is characterized by **optic nerve damage** and is typically associated with **elevated intraocular pressure**, leading to **peripheral vision loss** first - The patient's presentation of painless, gradual vision loss, particularly without mention of tunnel vision, is less typical for glaucoma *Diabetic retinopathy* - **Diabetic retinopathy** occurs in individuals with **diabetes mellitus** and can lead to blurred vision, floaters, or sudden vision loss due to macular edema or retinal hemorrhage - The patient's history does not mention diabetes, making this diagnosis less likely in the absence of that key risk factor

Q: A 65-year-old patient presents with acute vision loss and is diagnosed with central retinal artery occlusion. What is the most appropriate immediate intervention to attempt to restore vision?

Ocular massage. ***Ocular massage*** - **Ocular massage** is an immediate intervention used to attempt to dislodge the **embolic clot** and move it into a smaller branch of the retinal artery, potentially restoring some blood flow. - This maneuver aims to reduce intraocular pressure, which can also help improve retinal perfusion. - It is the **most appropriate immediate intervention** because it can be performed **instantly at bedside** without special equipment or screening. *Laser photocoagulation* - **Laser photocoagulation** is generally used to treat retinal conditions such as **diabetic retinopathy** or retinal tears, not for acute central retinal artery occlusion. - It works by creating small burns to seal blood vessels or destroy abnormal tissue, which would not address an acute arterial blockage. *Intravitreal injection of anti-VEGF* - **Anti-VEGF injections** are commonly used to treat conditions involving **neovascularization** or **macular edema**, such as wet age-related macular degeneration or diabetic macular edema. - They are not indicated for restoring blood flow in an acute arterial occlusion, whose primary pathology is embolic. *Intravenous thrombolysis* - While **intravenous thrombolysis (IV tPA)** has been explored for CRAO and is used in some specialized centers within a **very narrow time window** (typically <4.5 hours), it requires careful patient screening for contraindications and immediate availability of resources. - Compared to **ocular massage**, which can be performed immediately at bedside, IV thrombolysis is **not the most appropriate immediate intervention** due to time required for screening, contraindication assessment, and administration. - Evidence for its efficacy remains controversial, with some studies showing benefit and others showing no significant visual improvement compared to conservative measures.

Q: A 5-year-old child is brought in with leukocoria and a family history of ocular tumors. Fundus examination reveals a white mass. What is the most likely diagnosis?

Retinoblastoma. **Retinoblastoma** - **Leukocoria**, a **whitish pupillary reflex**, is the most common presenting sign of retinoblastoma, especially in children, and the **white mass** seen on fundus examination is characteristic of the tumor. - A **family history of ocular tumors** strongly suggests a genetic predisposition to retinoblastoma, as mutations in the **RB1 gene** are often inherited. - Retinoblastoma is the **most common intraocular malignancy in children**, typically presenting before age 5 years. *Congenital cataract* - While congenital cataracts can cause **leukocoria**, they typically present as a hazy or cloudy lens rather than a **solid white mass** on fundus examination. - A **family history of ocular tumors** is not typically associated with congenital cataracts. - The cataract would be seen in the **lens**, not as a retinal mass. *Coats' disease* - Coats' disease is characterized by **abnormal retinal blood vessels** and **exudative retinal detachment**, leading to leukocoria. - However, it typically presents with **telangiectatic vessels** and lipid exudates rather than a discrete white mass, and a **family history of ocular tumors** is not a common feature. - Usually **unilateral** and occurs in young males with **no hereditary pattern**. *Persistent hyperplastic primary vitreous* - This condition results from the **failure of the primary vitreous to regress** and can cause leukocoria due to a retrolental membrane. - While it presents with leukocoria, fundus examination would reveal a **retrolental fibrovascular membrane** rather than a distinct white intraocular mass, and it is not strongly linked to a **family history of ocular tumors**. - Typically **unilateral** and **non-hereditary**.

Q: Which pattern of inheritance is commonly observed in Best's disease?

Autosomal dominant. ***Autosomal dominant*** - Best's disease, also known as **vitelliform macular dystrophy**, is characterized by its **autosomal dominant** inheritance pattern. - This means only one copy of the defective gene (BEST1 gene) is needed to cause the disorder, and affected individuals have a 50% chance of passing it to each child. *Autosomal recessive* - In **autosomal recessive** inheritance, two copies of the defective gene are required for the disease to manifest, meaning both parents must be carriers. - This pattern is not characteristic of Best's disease. *X-linked recessive* - **X-linked recessive** disorders primarily affect males, as the defective gene is located on the X chromosome, and females usually need two affected X chromosomes to show symptoms. - This mode of inheritance is not seen with Best's disease. *Mitochondrial inheritance* - **Mitochondrial inheritance** involves mutations in the mitochondrial DNA and is passed exclusively from the mother to all her children. - Best's disease is not associated with mitochondrial gene mutations.

Question 1

A patient with a history of myopia presents with new floaters and flashes of light. Fundoscopy reveals a retinal tear. What is the initial management?

Accepted Answer

Laser photocoagulation

Answer

Vitrectomy

Answer

Scleral buckle

Answer

Cryotherapy

Question 2

What is the primary function of the macula in terms of visual field?

Accepted Answer

Central vision

Answer

Peripheral vision

Answer

Night vision

Answer

Color vision

Question 3

Cotton wool spots on fundoscopic examination are characteristically seen in all of the following EXCEPT:

Accepted Answer

Glaucoma

Answer

Hypertensive retinopathy

Answer

Diabetic retinopathy

Answer

Retinal detachment

Question 4

A 70-year-old man presents with gradual, painless vision loss and a history of smoking. What is the most likely diagnosis?

Accepted Answer

Age-related macular degeneration

Answer

Cataracts

Answer

Glaucoma

Answer

Diabetic retinopathy

Question 5

A 75-year-old male with a history of atrial fibrillation presents with sudden vision loss in the right eye. Fundoscopy reveals a cherry-red spot in the macula. Analyze the clinical findings and determine the most appropriate next step in management.

Accepted Answer

Immediate ophthalmology consultation

Answer

Intravenous tissue plasminogen activator

Answer

Emergent carotid endarterectomy

Answer

Intra-arterial thrombolysis

Question 6

A 65-year-old patient presents with acute vision loss and is diagnosed with central retinal artery occlusion. What is the most appropriate immediate intervention to attempt to restore vision?

Accepted Answer

Ocular massage

Answer

Laser photocoagulation

Answer

Intravitreal injection of anti-VEGF

Answer

Intravenous thrombolysis

Question 7

A 5-year-old child is brought in with leukocoria and a family history of ocular tumors. Fundus examination reveals a white mass. What is the most likely diagnosis?

Accepted Answer

Retinoblastoma

Answer

Congenital cataract

Answer

Coats' disease

Answer

Persistent hyperplastic primary vitreous

Question 8

A 55-year-old male with a history of diabetes presents with progressive vision loss. Fundoscopy reveals neovascularization of the disc and vitreous hemorrhage. What is the most appropriate treatment?

Accepted Answer

Panretinal photocoagulation

Answer

Intravitreal anti-VEGF injection

Answer

Focal laser photocoagulation

Answer

Vitrectomy

Question 9

A patient with a history of diabetes presents with sudden vision loss and a "shower of floaters." Fundoscopy reveals a dense vitreous hemorrhage. What is the immediate next step in management?

Accepted Answer

Vitrectomy

Answer

Observation

Answer

Panretinal photocoagulation

Answer

Intravitreal anti-VEGF injection

Question 10

Which pattern of inheritance is commonly observed in Best's disease?

Accepted Answer

Autosomal dominant

Answer

Autosomal recessive

Answer

X-linked recessive

Answer

Mitochondrial inheritance

Diseases of the Retina — MCQs

Diseases of the Retina — MCQs

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