Glaucoma — MCQs

Glaucoma Indian Medical PG Practice Questions and MCQs

Question 361: In a 45-year-old patient presenting with sudden onset of severe headache, blurred vision, nausea, and eye pain over the past 6 hours, which condition should be prioritized for evaluation?

A. Migraine
B. Temporal arteritis
C. Glaucoma (Correct Answer)
D. Brain tumor

Explanation: ***Glaucoma*** - The sudden onset of **severe headache**, **blurred vision**, **nausea**, and **eye pain** over 6 hours is highly suggestive of **acute angle-closure glaucoma (AACG)**. - AACG is an **ophthalmic emergency** that can lead to rapid irreversible vision loss if not treated promptly. - The classic triad includes **severe eye pain**, **decreased vision**, and **systemic symptoms** (headache, nausea, vomiting). - Examination would typically reveal **mid-dilated non-reactive pupil**, **corneal edema**, **elevated intraocular pressure**, and **shallow anterior chamber**. *Migraine* - While migraines cause **headache**, **nausea**, and **photophobia**, they typically do not present with acute, severe eye pain or rapid vision loss as the primary symptom. - The acute onset with prominent eye pain and the specific constellation of symptoms point away from migraine. - Visual symptoms in migraine are usually bilateral and present as scintillating scotomas or visual aura. *Temporal arteritis* - This condition typically affects individuals **over 50 years** and presents with **temporal headache**, **jaw claudication**, **scalp tenderness**, and **systemic symptoms** (fever, weight loss, elevated ESR). - While it can cause **sudden vision loss** due to **anterior ischemic optic neuropathy (AION)**, it does not typically present with acute eye pain. - The patient's age (45 years) and acute eye pain make this less likely. *Brain tumor* - Brain tumors usually cause **progressive headaches** that are worse in the morning and may be accompanied by **focal neurological deficits**, **seizures**, or **papilledema**. - The **acute onset** (over 6 hours), **prominent eye pain**, and **absence of neurological deficits** make a brain tumor unlikely as the primary concern. - This would not explain the acute eye pain and rapid vision changes.

Question 362: What is the normal range of intraocular pressure (IOP) in mm Hg?

A. 10-21 mm Hg (Correct Answer)
B. 5-10 mm Hg
C. 8-15 mm Hg
D. 15-25 mm Hg

Explanation: ***10-21 mm Hg*** - This range is considered the physiological **normal intraocular pressure (IOP)**, maintained by a balance between aqueous humor production and drainage. - Deviations outside this range can indicate a risk for ocular pathologies like **glaucoma** (high IOP) or hypotony (low IOP). *8-15 mm Hg* - This range is generally considered to be on the **lower side** of normal IOP and might be seen in some individuals, but it's not the full standard normal range. - While an IOP within this range is usually healthy, it excludes some values typically considered normal, such as 16-21 mm Hg. *5-10 mm Hg* - An IOP in this range is typically considered **low** or indicative of **ocular hypotony**, which can be caused by various conditions such as inflammation, trauma, or certain surgical complications. - Sustained low IOP can lead to complications such as **macular edema** and choroidal folds. *15-25 mm Hg* - While the lower part of this range (15-21 mm Hg) is normal, an IOP getting close to or exceeding **21 mm Hg** is considered **ocular hypertension** and a risk factor for glaucoma. - Although it's a broad range, the upper limit of 25 mm Hg falls outside the standard normal physiological range for IOP.

Question 363: A patient presents with blurred vision and sees 'halos' around lights. Examination reveals corneal edema and a mid-dilated pupil. What is the most likely diagnosis?

A. Acute angle-closure glaucoma (Correct Answer)
B. Chronic open-angle glaucoma
C. Central retinal vein occlusion
D. Keratitis

Explanation: ***Acute angle-closure glaucoma*** - The sudden onset of **blurred vision**, **halos** around lights, **corneal edema**, and a **mid-dilated pupil** are classic signs of acute angle-closure glaucoma, indicating a rapid increase in intraocular pressure. - This condition is an **ophthalmic emergency** requiring immediate pressure reduction to prevent permanent vision loss. *Chronic open-angle glaucoma* - This condition is typically **asymptomatic** in its early stages and progresses slowly, causing gradual peripheral vision loss without acute pain or halos. - It usually presents with a **normal pupil** and *does not cause sudden corneal edema* or a mid-dilated pupil. *Central retinal vein occlusion* - This presents with sudden **painless vision loss**, and does not typically cause halos, corneal edema, or a mid-dilated pupil. - Funduscopic examination would reveal **retinal hemorrhages** and **dilated, tortuous veins**. *Keratitis* - **Keratitis** involves inflammation of the cornea, which can cause pain, blurred vision, and light sensitivity, but typically *does not cause halos* or a mid-dilated pupil. - It's often associated with a **foreign body sensation**, redness, and visible corneal lesions or ulcers.

Question 364: A 50-year-old man with progressive visual field loss is diagnosed with primary open-angle glaucoma. Which surgical procedure is most commonly performed if medical management is unsuccessful?

A. Trabeculectomy (Correct Answer)
B. Laser trabeculoplasty
C. Cyclophotocoagulation
D. Goniotomy

Explanation: ***Trabeculectomy*** - **Trabeculectomy** is the most common traditional incisional surgical procedure for primary open-angle glaucoma when medical management fails, creating a new drainage pathway for aqueous humor. - It involves creating a **scleral flap** and an opening into the anterior chamber, forming a bleb under the conjunctiva to reduce intraocular pressure. *Laser trabeculoplasty* - This is a **non-incisional laser procedure** that improves aqueous outflow through the trabecular meshwork. - It is typically used **before or as an adjunct to medical therapy**, not after medical management has failed, and is considered part of the treatment ladder rather than a surgical rescue option. - While it can lower intraocular pressure, its effects may diminish over time and typically do not achieve the same significant, long-term pressure reduction as trabeculectomy. *Cyclophotocoagulation* - This procedure uses a laser to **destroy part of the ciliary body** epithelium, reducing aqueous humor production. - It is typically reserved for more advanced or refractory cases where other surgeries have failed or are not suitable, often associated with higher risks of inflammation and vision loss. *Goniotomy* - **Goniotomy** is primarily indicated for **congenital glaucoma** in infants and young children, where there is an abnormal angle structure. - It involves incising the trabecular meshwork directly to improve aqueous drainage, but it is generally not effective for adult primary open-angle glaucoma.

Question 365: Which test is used to directly visualize the drainage angle of the eye to help diagnose and differentiate types of glaucoma?

A. Gonioscopy (Correct Answer)
B. Tonometry
C. Pachymetry
D. Visual field testing

Explanation: ***Gonioscopy*** - **Gonioscopy** directly visualizes the **iridocorneal angle**, allowing assessment of its openness and identifying any structural abnormalities or blockages contributing to glaucoma. - This crucial diagnostic procedure helps differentiate between **open-angle** and **angle-closure glaucoma**, guiding appropriate treatment strategies. *Tonometry* - **Tonometry** measures the **intraocular pressure (IOP)**, which is a significant risk factor for glaucoma but does not directly assess the drainage angle. - While high IOP is associated with glaucoma, it doesn't definitively diagnose open-angle glaucoma, as some individuals with normal IOP can still develop the condition. *Pachymetry* - **Pachymetry** measures the **corneal thickness**, which influences the accuracy of IOP readings obtained via tonometry. - It helps in interpreting IOP values by correcting for corneal thickness, but it does not directly evaluate the drainage angle or diagnose glaucoma itself. *Visual field testing* - **Visual field testing** assesses the extent of peripheral vision and identifies any **blind spots** or defects caused by optic nerve damage due to glaucoma. - While essential for monitoring disease progression and severity, it is an indirect measure of glaucoma's impact on vision, not a direct assessment of the drainage angle.

Question 366: A patient with glaucoma is being monitored for disease progression. What is the most appropriate method for detecting early functional changes?

A. Perimetry (Correct Answer)
B. Tonometry
C. Gonioscopy
D. OCT

Explanation: ***Perimetry*** - **Perimetry** (visual field testing) directly assesses the patient's **functional vision** by detecting **scotomas** and visual field defects. - This is the gold standard for detecting **functional changes** in glaucoma, showing areas of vision loss that impact the patient's daily activities. - Automated perimetry (Humphrey visual field) can detect functional deficits and monitor progression over time. *Tonometry* - **Tonometry** measures **intraocular pressure (IOP)**, which is a risk factor for glaucoma but not a measure of functional damage. - Elevated IOP indicates risk but doesn't directly assess whether **visual function** has been affected or is progressing. *Gonioscopy* - **Gonioscopy** visualizes the **anterior chamber angle** to classify glaucoma type (open-angle vs. angle-closure). - Provides anatomical information but does not measure **functional vision loss** or detect progression of visual field defects. *OCT* - **Optical Coherence Tomography (OCT)** detects **structural changes** in the retinal nerve fiber layer (RNFL) and optic disc. - While OCT can detect structural damage early (sometimes before functional changes), it measures **anatomy**, not **function**. - The question specifically asks for functional changes, making perimetry the most appropriate choice.

Question 367: Which test is used to measure intraocular pressure?

A. Gonioscopy
B. Tonometry (Correct Answer)
C. Perimetry
D. Ophthalmoscopy

Explanation: ***Tonometry*** - **Tonometry** is the specific test designed to measure the **intraocular pressure (IOP)** within the eye. - This measurement is crucial for diagnosing and monitoring conditions like **glaucoma**, where elevated IOP can damage the **optic nerve**. *Gonioscopy* - **Gonioscopy** is a technique used to visualize the **anterior chamber angle** of the eye. - It helps in assessing the drainage angle and identifying types of **glaucoma**, but it does not directly measure pressure. *Perimetry* - **Perimetry**, also known as a visual field test, assesses a patient's **peripheral and central vision**. - It is used to detect and monitor **visual field defects** which can be caused by conditions like glaucoma, but it does not measure IOP. *Ophthalmoscopy* - **Ophthalmoscopy** is a procedure used to examine the posterior structures of the eye, including the **retina**, **optic disc**, and **blood vessels**. - It helps assess for signs of disease, such as **optic nerve damage** in glaucoma, but it does not directly measure intraocular pressure.

Question 368: A patient with chronic glaucoma is found to have optic nerve head cupping and visual field loss. What is the most well-established mechanism of optic nerve damage in glaucoma?

A. Increased intraocular pressure (Correct Answer)
B. Vascular insufficiency
C. Genetic predisposition
D. Inflammation

Explanation: ***Increased intraocular pressure*** - **Elevated intraocular pressure** is the most significant and well-established risk factor for **optic nerve damage** in glaucoma, leading to mechanical stress and axonal injury. - This increased pressure causes **optic nerve head cupping** and **visual field loss** by damaging the retinal ganglion cell axons at the lamina cribrosa. *Vascular insufficiency* - While vascular factors may contribute to **optic nerve damage** in some glaucoma patients, particularly in normal-tension glaucoma, they are not considered the primary or **most well-established mechanism** across all forms of the disease. - Reduced blood flow can exacerbate damage, but **intraocular pressure** remains the leading cause. *Genetic predisposition* - **Genetic factors** play a role in susceptibility to glaucoma and can influence the severity and age of onset, but they are not a direct mechanism of **optic nerve damage**. - Genes predispose individuals to develop glaucoma, but the actual damage is mediated by **downstream mechanisms** like elevated IOP. *Inflammation* - **Inflammation** is not a primary or well-established mechanism of **optic nerve damage** in chronic glaucoma. - While some research explores inflammatory components, it is not considered the main pathophysiological pathway, unlike in conditions such as **optic neuritis**.

Question 369: Which type of visual field defect is typically observed in glaucoma?

A. Arcuate scotoma (Correct Answer)
B. Central scotoma
C. Homonymous hemianopia
D. Bitemporal hemianopia

Explanation: ***Arcuate scotoma*** - An **arcuate scotoma** is a characteristic visual field defect in glaucoma, following the path of the **retinal nerve fibers** as they arc over the macula to the optic nerve head. - It typically starts as a **paracentral scotoma** and then expands, eventually connecting to the blind spot and forming an arc-shaped defect. *Central scotoma* - A **central scotoma** involves the fovea and is common in **macular diseases** such as **age-related macular degeneration** or optic neuropathies other than glaucoma. - This defect directly affects central vision and is not typically the primary visual field defect in glaucoma. *Homonymous hemianopia* - **Homonymous hemianopia** is a loss of visual field on the same side in both eyes, indicating a lesion in the **visual pathway posterior to the optic chiasm** (e.g., stroke, tumor). - This type of defect is not associated with glaucoma, which is an optic nerve disease affecting individual eyes. *Bitemporal hemianopia* - **Bitemporal hemianopia** is a loss of vision in the outer half of both visual fields, typically caused by compression of the **optic chiasm**, most commonly by a **pituitary adenoma**. - This specific pattern of visual field loss is distinct from the damage caused by elevated intraocular pressure in glaucoma.

Question 370: Which of the following is NOT a sign of angle closure glaucoma?

A. Mid-dilated fixed pupil
B. Edematous cornea
C. Edematous and hyperemic optic disc
D. Multiple iris nodules (Correct Answer)

Explanation: ***Multiple iris nodules*** - **Iris nodules**, such as **Lisch nodules** in neurofibromatosis or **Brushfield spots** in Down syndrome, are developmental anomalies or manifestations of systemic diseases, not signs of acute angle-closure glaucoma. - Their presence does not relate to the rapid increase in **intraocular pressure** characteristic of acute angle closure. *Mid-dilated fixed pupil* - A **mid-dilated, fixed pupil** (typically 4-6 mm) that is poorly reactive or non-reactive to light is a classic sign of **acute angle-closure glaucoma**. - The pupil becomes fixed due to **iris sphincter ischemia** from the sudden elevation of intraocular pressure, and may appear **vertically oval** or irregular. *Edematous cornea* - **Corneal edema** (swelling) results from very high **intraocular pressure** exceeding the osmotic gradient that ordinarily keeps the cornea clear and deturgescent. - This leads to a hazy or cloudy cornea, causing **blurred vision** and often **halos around lights**. *Edematous and hyperemic optic disc* - While less common in acute angle closure compared to chronic forms, severe and prolonged elevations in **intraocular pressure** can lead to **optic disc edema** (swelling and congestion of the optic nerve head). - This is an indicator of optic nerve compromise due to pressure and impaired axoplasmic flow.

Practice by Chapter

Aqueous Humor Dynamics

Practice Questions

Primary Open-Angle Glaucoma

Practice Questions

Primary Angle-Closure Glaucoma

Practice Questions

Secondary Open-Angle Glaucomas

Practice Questions

Secondary Angle-Closure Glaucomas

Practice Questions

Developmental and Congenital Glaucomas

Practice Questions

Medical Management of Glaucoma

Practice Questions

Laser Therapy in Glaucoma

Practice Questions

Glaucoma Filtration Surgery

Practice Questions

Glaucoma Drainage Devices

Practice Questions

Angle Assessment Techniques

Practice Questions

Visual Field Testing in Glaucoma

Practice Questions

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Glaucoma — MCQs

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