Angle Assessment Techniques — MCQs
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?
What is not an advantage of USG over mammography?
Which of the following ophthalmologic conditions shows 'Vossius ring' during examination?
Which diagnostic procedure is not done in a dilated pupil?
Which optical instrument utilizes the principle of total internal reflection?
Statement 1 - A 59-year-old patient presents with flaccid bullae. Histopathology shows a suprabasal acantholytic split. Statement 2 - The row of tombstones appearance is diagnostic of Pemphigus vulgaris.
Indirect ophthalmoscopy is done for:
You are suturing a laceration in the ER using the interrupted suturing technique. What is the angle of needle placement?
40-year-old male with spherophakia is at risk for developing
Laser iridotomy is done in?
Angle Assessment Techniques Indian Medical PG Practice Questions and MCQs
Question 1: 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?
- A. Ultrasound imaging of the eye
- B. Measurement of intraocular pressure
- C. Detailed examination under anesthesia (Correct Answer)
- D. CT imaging of the orbit and head
Explanation: ***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.
Question 2: What is not an advantage of USG over mammography?
- A. Can be used for guided biopsy
- B. Superior detection of microcalcifications (Correct Answer)
- C. In young females with dense breasts
- D. Can be used to differentiate solid VS cystic
Explanation: ***Superior detection of microcalcifications*** - **Mammography** is the gold standard for detecting **microcalcifications**, which can be a key indicator of **ductal carcinoma in situ (DCIS)** or early invasive breast cancer. - **Ultrasound (USG)** has limited sensitivity for detecting and characterizing microcalcifications. *Can be used for guided biopsy* - **USG-guided biopsy** is a common and advantageous technique for obtaining tissue samples from suspicious lesions in the breast or other organs. - This allows for **real-time visualization** of the needle, improving accuracy and reducing complications. *Can be used to differentiate solid VS cystic* - **USG** excels at distinguishing between **solid masses and fluid-filled cysts** due to differences in sound wave reflection. - This capability is crucial in characterizing breast lesions and often eliminates the need for further invasive procedures for benign cysts. *In young females with dense breasts* - **Dense breast tissue** in young females can obscure lesions on mammography, making interpretation difficult. - **USG** is particularly valuable in this population because it is not hindered by breast density and can provide a clearer view of underlying pathology.
Question 3: Which of the following ophthalmologic conditions shows 'Vossius ring' during examination?
- A. Angle closure glaucoma
- B. Traumatic iritis (Correct Answer)
- C. Retinal detachment
- D. Corneal ulcer
Explanation: ***Traumatic iritis*** - A **Vossius ring** is a circular pigment deposit on the anterior lens capsule, formed by the impact of the iris during **ocular trauma**. - Its presence is a clear indicator of **blunt globe trauma**, which often leads to traumatic iritis. *Angle closure glaucoma* - This condition involves an **acute increase in intraocular pressure** due to the iris blocking the drainage angle. - While it can cause severe pain and vision loss, it does not involve the formation of a **Vossius ring**. *Retinal detachment* - This condition involves the separation of the sensory retina from the underlying retinal pigment epithelium. - Symptoms include **flashing lights**, **floaters**, and a **"curtain" vision loss**, with no association with a Vossius ring. *Corneal ulcer* - A corneal ulcer is an **open sore on the cornea**, typically caused by infection or injury. - It presents with **pain**, **photophobia**, **redness**, and **discharge**, without the characteristic lens pigment deposit.
Question 4: Which diagnostic procedure is not done in a dilated pupil?
- A. Laser interferometry
- B. Electroretinography
- C. Gonioscopy (Correct Answer)
- D. Fundus examination
Explanation: ***Gonioscopy*** - **Gonioscopy** is the examination of the **anterior chamber angle**, where the **iris** meets the **cornea**. - It is crucial for assessing **glaucoma** and is typically performed with a **nondilated pupil** to allow the iris to lie in its natural anatomical position, which helps visualize the angle structures accurately. *Laser interferometry* - **Laser interferometry** is used to assess **potential visual acuity** in patients with **media opacities** such as cataracts. - This procedure benefits from a **dilated pupil** as it allows more light to pass through existing clear areas of the lens, improving the measurement. *Electroretinography* - **Electroretinography (ERG)** measures the **electrical responses of the retina** to light stimulation. - **Pupil dilation** is generally performed to maximize the amount of light reaching the retina, ensuring a comprehensive assessment of retinal function. *Fundus examination* - A **fundus examination** visualizes the **retina, optic disc, macula, and retinal blood vessels**. - **Dilation of the pupil** is a standard practice for a thorough fundus examination, as it allows for a wider and more complete view of the posterior segment of the eye, facilitating detection of various retinal pathologies.
Question 5: Which optical instrument utilizes the principle of total internal reflection?
- A. Gonioscope (Correct Answer)
- B. Pachymeter
- C. Ophthalmoscope
- D. Lensometer
Explanation: ***Gonioscope*** - A **gonioscope** uses mirrors or prisms to allow visualization of the **anterior chamber angle**, leveraging **total internal reflection** to bypass the normal optical limitations of the cornea. - The principle of total internal reflection occurs when light traveling from a denser medium (like the prism/mirror in the gonioscope) hits an interface with a less dense medium (like air or the aqueous humor) at an angle greater than the **critical angle**, causing all light to reflect back. *Pachymeter* - A **pachymeter** is used to measure the **thickness of the cornea**, typically employing ultrasound or optical methods. - It does not rely on total internal reflection but rather on the time-of-flight of sound waves or the reflection/scattering of light from corneal layers. *Ophthalmoscope* - An **ophthalmoscope** is used to examine the posterior segment of the eye, including the **fundus**, optic disc, and retina. - It works by directing a light source into the eye and viewing the reflected light, using lenses to focus the image, without utilizing total internal reflection. *Lensometer* - A **lensometer** (or focimeter) is an optician's instrument used to measure the prescription of eyeglasses or contact lenses, including **sphere, cylinder, and axis**. - Its operation is based on standard lens optics and does not involve the principle of total internal reflection.
Question 6: Statement 1 - A 59-year-old patient presents with flaccid bullae. Histopathology shows a suprabasal acantholytic split. Statement 2 - The row of tombstones appearance is diagnostic of Pemphigus vulgaris.
- A. Statements 1 & 2 are correct, 2 is not explaining 1 (Correct Answer)
- B. Statements 1 and 2 are correct and 2 is the correct explanation for 1
- C. Statements 1 and 2 are incorrect
- D. Statement 1 is incorrect
Explanation: ***Correct: Statements 1 & 2 are correct, 2 is not explaining 1*** **Analysis of Statement 1:** - A 59-year-old patient with **flaccid bullae** and **suprabasal acantholytic split** on histopathology is the classic presentation of **Pemphigus vulgaris** - The flaccid (easily ruptured) nature of bullae distinguishes it from tense bullae seen in bullous pemphigoid - The suprabasal location of the split (just above the basal layer) with acantholysis (loss of cell-to-cell adhesion) is pathognomonic - **Statement 1 is CORRECT** ✓ **Analysis of Statement 2:** - The **"row of tombstones" or "tombstone appearance"** is indeed a diagnostic histopathological feature of Pemphigus vulgaris - This appearance results from basal keratinocytes remaining attached to the basement membrane while suprabasal cells separate due to acantholysis - The intact basal cells standing upright resemble a row of tombstones - **Statement 2 is CORRECT** ✓ **Does Statement 2 explain Statement 1?** - Statement 2 describes a **histopathological appearance** (tombstone pattern) that is a **consequence** of the suprabasal split - However, it does NOT explain the **underlying cause** of the flaccid bullae or the suprabasal split - The true explanation involves **IgG autoantibodies against desmoglein 3 (and desmoglein 1)**, which attack intercellular adhesion structures (desmosomes), causing **acantholysis** - Therefore, **Statement 2 does NOT explain Statement 1** ✗ *Incorrect: Statement 2 is the correct explanation for Statement 1* - While both statements describe features of Pemphigus vulgaris, the tombstone appearance is a descriptive finding, not an explanatory mechanism *Incorrect: Statements 1 and 2 are incorrect* - Both statements are medically accurate descriptions of Pemphigus vulgaris features *Incorrect: Statement 1 is incorrect* - Statement 1 correctly describes the cardinal clinical and histopathological features of Pemphigus vulgaris
Question 7: Indirect ophthalmoscopy is done for:
- A. Macula and central retina
- B. Periphery of retina (Correct Answer)
- C. Sclera
- D. Angle of anterior chamber
Explanation: ***Periphery of retina*** - Indirect ophthalmoscopy offers a **wide field of view** and **stereoscopic imaging**, making it ideal for examining the **peripheral retina**. - It allows for the detection of peripheral retinal lesions like **tears, detachments, and degenerations** that may be missed with direct ophthalmoscopy. *Macula and central retina* - While indirect ophthalmoscopy can visualize the macula, **direct ophthalmoscopy** provides a **higher magnification** and better resolution for detailed examination of the macula and optic disc. - Conditions like **macular degeneration** or **diabetic macular edema** are usually evaluated more precisely with direct ophthalmoscopy or specialized imaging. *Sclera* - The sclera is the **outer white layer of the eye**; its examination is primarily done through **external inspection** of the globe. - Ophthalmoscopy, whether direct or indirect, is focused on visualizing the **fundus** (retina, optic disc, blood vessels), not the sclera. *Angle of ant. chamber* - The **angle of the anterior chamber** is evaluated using **gonioscopy**, a specialized technique involving a contact lens with mirrors. - Ophthalmoscopy is not suitable for visualizing this structure, which is crucial for diagnosing and managing **glaucoma**.
Question 8: You are suturing a laceration in the ER using the interrupted suturing technique. What is the angle of needle placement?
- A. 80 degrees
- B. 70 degrees
- C. 60 degrees
- D. 90 degrees (Correct Answer)
Explanation: ***90 degrees*** - Placing the needle at a **90-degree angle** to the skin surface ensures that the suture comes out perpendicular to the skin edge, creating an **eversion of the wound edges**. - This perpendicular entry allows for an equal amount of tissue to be grasped on both sides of the wound, promoting proper **wound approximation** and healing. *80 degrees* - An 80-degree angle, while close, would not provide the ideal **perpendicular entry** needed to properly evert the wound edges. - This slight deviation from 90 degrees could lead to less precise **tissue approximation** and potentially an inverted wound edge. *70 degrees* - A 70-degree angle is too shallow and would result in the suture entering the wound more tangentially, leading to **inverted wound edges**. - **Inverted wound edges** hinder optimal healing and can result in a less aesthetically pleasing scar. *60 degrees* - A 60-degree angle is significantly too shallow, which would cause the suture to be placed too superficially and horizontally, resulting in **poor wound edge eversion**. - This angle would make it difficult to adequately appose the deeper dermal layers, compromising **tensile strength** and increasing the risk of scar formation.
Question 9: 40-year-old male with spherophakia is at risk for developing
- A. Phacolytic glaucoma
- B. Phacoanaphylactic glaucoma
- C. Phacomorphic glaucoma (Correct Answer)
- D. Obscuration of disc margins
Explanation: ***Phacomorphic glaucoma*** - **Spherophakia** describes a small, spherical lens that can become swollen, leading to a shallow anterior chamber and subsequent **angle closure glaucoma**. - This condition is termed **phacomorphic glaucoma** when the increase in lens size and shape directly causes obstruction of aqueous outflow. *Phacolytic glaucoma* - This type of glaucoma results from a **leaky lens capsule** in a hypermature cataract, releasing high-molecular-weight proteins that clog the trabecular meshwork. - It is not directly associated with the small, spherical shape of the lens seen in spherophakia. *Phacoanaphylactic glaucoma* - This is an inflammatory response to **lens protein exposure** following trauma or surgery, leading to a granulomatous reaction. - It involves an immune reaction to lens material and is not typically a direct consequence of spherophakia itself. *Obscuration of disc margins* - **Optic disc obscuration** (papilledema) is a sign of increased intracranial pressure, not a direct complication of spherophakia. - While glaucoma can affect the optic disc, spherophakia primarily leads to angle-closure dynamics.
Question 10: Laser iridotomy is done in?
- A. Pigmentary glaucoma
- B. None of the options
- C. Angle closure glaucoma (Correct Answer)
- D. Open angle glaucoma
Explanation: ***Angle closure glaucoma*** - **Laser iridotomy** creates a small hole in the iris, allowing aqueous humor to flow directly from the posterior to the anterior chamber, thus relieving pupillary block and opening the angle. - This procedure is the definitive treatment to prevent further **angle closure attacks** and is also used prophylactically in eyes at risk. *Open angle glaucoma* - This condition involves an **open angle** but impaired outflow of aqueous humor through the **trabecular meshwork**. - Laser iridotomy is not indicated as it does not address the primary outflow obstruction in the trabecular meshwork. *Pigmentary glaucoma* - This is a type of **open-angle glaucoma** caused by pigment dispersion that clogs the trabecular meshwork, leading to increased intraocular pressure. - While pigment can be released from the iris, the primary issue is the **trabecular meshwork obstruction**, which is not directly resolved by iridotomy. *None of the options* - This option is incorrect because **angle closure glaucoma** is a clear indication for laser iridotomy.
Want unlimited practice?
Get full access to all questions, explanations, and performance tracking.
Start For Free