Definition and Classification of Low Vision Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Definition and Classification of Low Vision. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Definition and Classification of Low Vision Indian Medical PG Question 1: What does a visual acuity test primarily assess?
- A. Ability to perceive light
- B. Ability to differentiate colors
- C. Ability to recognize shapes and details (Correct Answer)
- D. Ability to detect contrast
Definition and Classification of Low Vision Explanation: ***Ability to recognize shapes and details***
- A visual acuity test, typically using a **Snellen chart**, measures the sharpness of vision, specifically the ability to discern letters or symbols at a given distance.
- It assesses the eye's capacity to resolve fine **spatial detail**, which is crucial for tasks like reading and recognizing faces.
- This is the fundamental definition of visual acuity and what these tests are specifically designed to measure.
*Ability to perceive light*
- This refers to **light perception (LP)**, the most basic form of vision, indicating whether a person can detect the presence or absence of light.
- While essential for vision, it is a much simpler function than what visual acuity tests measure and is assessed separately.
*Ability to differentiate colors*
- This is assessed by **color vision tests**, such as the Ishihara plates, which evaluate the function of cone photoreceptors.
- It specifically checks for **color blindness** (e.g., red-green or blue-yellow deficiencies) and is distinct from the sharpness of vision.
*Ability to detect contrast*
- This is measured by **contrast sensitivity tests**, which evaluate the ability to distinguish objects from their background at various contrast levels.
- While related to overall visual quality, it is a different aspect of vision than the ability to recognize fine details at high contrast.
Definition and Classification of Low Vision Indian Medical PG Question 2: A 50-year-old patient has difficulty reading close objects. Likely diagnosis?
- A. Hypermetropia
- B. Astigmatism
- C. Myopia
- D. Presbyopia (Correct Answer)
Definition and Classification of Low Vision Explanation: ***Presbyopia***
- This condition is characterized by the **loss of elasticity** in the lens of the eye, which occurs naturally with age, making it difficult to focus on **near objects**.
- Its typical presentation, as seen in this 50-year-old patient, is **difficulty reading close objects** or performing other tasks requiring near vision.
*Hypermetropia*
- Often causes **farsightedness**, meaning distant objects are seen clearly, but near objects appear blurry due to the eye attempting to constantly accommodate.
- While it can make near vision difficult, it is not primarily an age-related loss of accommodation and can affect individuals of various ages.
*Astigmatism*
- Results from an **irregular curvature of the cornea or lens**, causing blurred or distorted vision at all distances, rather than specifically difficulty with close objects.
- This condition makes it difficult for the eye to focus light uniformly on the retina, leading to multiple focal points or streaks.
*Myopia*
- This is commonly known as **nearsightedness**, where distant objects appear blurry while near objects are seen clearly.
- It occurs when the eyeball is too long or the cornea is too steeply curved, causing light to focus in front of the retina.
Definition and Classification of Low Vision Indian Medical PG Question 3: A patient complains of an inability to read a newspaper, particularly in bright sunlight. What is the most likely diagnosis?
- A. Nuclear cataract
- B. Cortical cataract
- C. Posterior subcapsular cataract (Correct Answer)
- D. Congenital cataract
Definition and Classification of Low Vision Explanation: ***Posterior subcapsular cataract***
- This type of cataract causes significant **glare** and **photophobia**, making it difficult to read in bright light due to opacities located at the **posterior lens capsule**.
- The patient experiences worsening vision in **bright light** conditions because the constricted pupil directs more light through the **central posterior opacity**, which lies directly in the visual axis.
*Nuclear cataract*
- Patients with **nuclear cataracts** typically experience **myopic shift** and improved near vision (second sight) due to increased refractive power of the lens.
- Vision is usually worse in **dim light** conditions because of pupillary dilation, which allows more light to pass through the central opacity.
*Cortical cataract*
- Characterized by **spoke-like opacities** that start in the periphery and extend inward.
- While it can cause glare, vision often remains good until the opacities encroach upon the **visual axis**, and it doesn't specifically cause worsening vision in bright light to the same degree as PSC.
*Congenital cataract*
- Present at birth or shortly after, and symptoms depend on the density and location of the opacity.
- While it affects vision, the specific complaint of difficulty reading in bright sunlight is not a typical distinguishing feature of **congenital cataracts**.
Definition and Classification of Low Vision Indian Medical PG Question 4: According to WHO ICD-11 classification, visual impairment in the better eye (with best correction) begins at a visual acuity worse than:
- A. 6/60
- B. 6/36
- C. 6/12 (Correct Answer)
- D. 6/24
Definition and Classification of Low Vision Explanation: ***6/12***
- According to the **WHO ICD-11 classification**, visual impairment begins when visual acuity is **less than 6/12** in the better eye with best correction.
- This threshold marks the beginning of **mild visual impairment** (visual acuity < 6/12 to ≥ 6/18).
- Visual acuity of 6/12 or better is considered **normal vision** without significant impairment.
*6/24*
- Visual acuity of **6/24** falls within the **moderate visual impairment** category (< 6/18 to ≥ 6/60).
- This represents established visual impairment but is not the threshold where impairment begins.
*6/36*
- Visual acuity of **6/36** also falls within the **moderate visual impairment** range.
- This indicates more significant vision loss than the threshold that defines the beginning of visual impairment.
*6/60*
- Visual acuity of **6/60 or worse** (< 6/60 to ≥ 3/60) is classified as **severe visual impairment**.
- Visual acuity worse than 3/60 is classified as **blindness**.
- This represents much more severe vision loss than the initial threshold for visual impairment.
Definition and Classification of Low Vision Indian Medical PG Question 5: Which finding excludes BIRADS 3 categorization?
- A. Normal lymph node
- B. Simple cyst
- C. Architectural distortion (Correct Answer)
- D. Focal asymmetry
Definition and Classification of Low Vision Explanation: ***Architectural distortion***
- **Architectural distortion** refers to a disruption of the normal breast parenchymal architecture in the absence of a discrete mass, often indicating an underlying malignancy.
- This finding is suspicious enough to warrant a recommendation of **biopsy (BI-RADS 4 or 5)**, thus **excluding BI-RADS 3**, which implies a probably benign finding with a low likelihood of malignancy (<2%).
- Architectural distortion has a high association with malignancy and cannot be categorized as BI-RADS 3.
*Normal lymph node*
- A **normal lymph node** within the breast or axilla is a common and benign finding, characterized by an oval shape, fatty hilum, and thin cortex.
- Its presence does not increase the suspicion of malignancy and is classified as **BI-RADS 1 or 2** (definitely benign).
- This does NOT exclude BI-RADS 3; it is simply a more benign finding.
*Simple cyst*
- A **simple cyst** is a very common and benign fluid-filled sac, readily identifiable by clear sonographic criteria (anechoic, thin smooth walls, posterior acoustic enhancement).
- It is classified as **BI-RADS 2** (benign finding), meaning it is definitely not malignant.
- This does NOT exclude BI-RADS 3; it is simply a more benign finding that does not require follow-up.
*Focal asymmetry*
- **Focal asymmetry** refers to an area of fibroglandular tissue that is visible on only one mammographic projection or is less conspicuous than a mass.
- If it has **no associated suspicious features**, it can be appropriately categorized as **BI-RADS 3**, requiring short interval follow-up.
- This does NOT exclude BI-RADS 3 categorization.
Definition and Classification of Low Vision Indian Medical PG Question 6: Which of the following is the platinum-based chemotherapeutic agent used as first-line treatment for ovarian carcinoma?
- A. Cyclophosphamide
- B. Methotrexate
- C. Cisplatin (Correct Answer)
- D. Dacarbazine
Definition and Classification of Low Vision Explanation: ***Cisplatin***
- **Cisplatin** is a platinum-based chemotherapy drug that forms **DNA cross-links**, inhibiting DNA synthesis and leading to the death of rapidly dividing cells, making it highly effective against **ovarian carcinoma**.
- It is a cornerstone of chemotherapy regimens for ovarian cancer, often used in combination with other agents such as paclitaxel.
*Methotrexate*
- **Methotrexate** is an **antimetabolite** that inhibits dihydrofolate reductase, thereby interfering with DNA synthesis.
- While it is used in various cancers like leukemia, lymphoma, and some solid tumors (e.g., breast cancer, gestational trophoblastic disease), it is **not a primary recommended drug for ovarian carcinoma**.
*Cyclophosphamide*
- **Cyclophosphamide** is an **alkylating agent** that causes DNA damage, leading to cell death.
- It is used in many cancers, including lymphoma, breast cancer, and some leukemias, but it is **not a first-line or primary agent for ovarian carcinoma** in contemporary treatment guidelines.
*Dacarbazine*
- **Dacarbazine** is an **alkylating agent** primarily used in the treatment of **malignant melanoma** and Hodgkin lymphoma.
- It is **not indicated for the treatment of ovarian carcinoma**.
Definition and Classification of Low Vision Indian Medical PG Question 7: What is the classification of intelligence corresponding to an IQ score of 90-109?
- A. Below average
- B. Average (Correct Answer)
- C. Slightly below average
- D. Above average
Definition and Classification of Low Vision Explanation: ***Average***
- An **IQ score** range of **90-109** is traditionally classified as **Average** intelligence.
- This range represents the **mean** and surrounding **standard deviation** of IQ scores in the general population.
*Below average*
- This classification usually corresponds to IQ scores in the range of **70-79** or **80-89**, depending on the specific scale.
- It does not represent the central tendency of the population's intelligence.
*Slightly below average*
- This category typically corresponds to IQ scores in the range of **80-89**.
- It falls just below the average range but is not as low as the "below average" classification.
*Above average*
- This classification is typically assigned to IQ scores that are in the range of **110-119** or higher.
- It signifies cognitive abilities that are greater than the majority of the population.
Definition and Classification of Low Vision Indian Medical PG Question 8: Which of the following statements about conjunctival lesions is NOT true?
- A. Arise from any part of conjunctiva
- B. Can cause Astigmatism
- C. Surgery is treatment of choice (Correct Answer)
- D. UV exposure is risk factor
Definition and Classification of Low Vision Explanation: ***Surgery is treatment of choice***
- While surgery can be used to treat conjunctival lesions, it is not always the **treatment of choice**, especially for smaller, asymptomatic lesions like **pinguecula** which may only require observation and lubrication.
- Many conjunctival lesions, such as uncomplicated **pterygium** or **pinguecula**, are managed conservatively unless they cause significant symptoms, vision impairment, or cosmetic concerns.
*Arise from any part of conjunctiva*
- **Conjunctival lesions** can indeed arise from various parts of the conjunctiva, including the palpebral, bulbar, and forniceal conjunctiva.
- For example, **pterygium** typically arises from the bulbar conjunctiva, while **pinguecula** also originates in the bulbar conjunctiva, specifically in the interpalpebral fissure.
*Can cause Astigmatism*
- Larger **conjunctival lesions**, particularly a **pterygium** that encroaches onto the cornea, can induce or alter astigmatism.
- The growth of the lesion can change the **curvature of the cornea**, leading to optical distortion and astigmatism.
*UV exposure is risk factor*
- **Ultraviolet (UV) light exposure** is a well-established risk factor for the development of many conjunctival lesions, including **pterygium** and **pinguecula**.
- Chronic UV exposure leads to **elastotic degeneration** of the conjunctival collagen and is thought to play a key role in the pathogenesis of these growths.
Definition and Classification of Low Vision Indian Medical PG Question 9: What is the WHO definition of blindness?
- A. visual acuity less than 6/60 or its equivalent
- B. visual acuity less than 3/60 or its equivalent (Correct Answer)
- C. visual acuity less than 6/18 or its equivalent
- D. visual acuity less than 1/60 or its equivalent
Definition and Classification of Low Vision Explanation: ***Visual acuity less than 3/60 or its equivalent***
- The **WHO definition of blindness** refers to a **presenting visual acuity** of less than 3/60 (or 20/400) in the better eye, or a **visual field** of less than 10 degrees from the point of fixation.
- This threshold signifies severe visual impairment that meets the criteria for legal or public health definitions of blindness.
- The 3/60 criterion is the internationally recognized standard for defining blindness in epidemiological and public health contexts.
*Visual acuity less than 6/60 or its equivalent*
- This level of vision typically falls under the category of **severe visual impairment** or **low vision** according to WHO classification, not blindness.
- While it represents significant visual loss, it is considered less severe than the 3/60 threshold used for defining blindness.
*Visual acuity less than 6/18 or its equivalent*
- A visual acuity of less than 6/18 is generally considered **moderate visual impairment** or **low vision**, not blindness.
- This level of vision implies difficulty with standard visual tasks but is typically not severe enough to be classified as blindness.
*Visual acuity less than 1/60 or its equivalent*
- This visual acuity is indeed very poor and would certainly be classified as blindness, but it is **more severe** than the WHO definition threshold.
- The 3/60 threshold is the specific cutoff point; while 1/60 indicates blindness, it is not the definition itself.
Definition and Classification of Low Vision Indian Medical PG Question 10: Semantic memory includes all except:
- A. Rules
- B. Language
- C. Events (Correct Answer)
- D. Words
Definition and Classification of Low Vision Explanation: ***Events***
- **Episodic memory** is the type of long-term memory that stores information about specific **personal events** and experiences, complete with their contextual details like time and place.
- Semantic memory, in contrast, involves general facts and knowledge, decoupled from specific personal experiences.
*Rules*
- **Semantic memory** encompasses our understanding of operating principles and **general truths**, such as the laws of physics or social conventions.
- This abstract knowledge about how things work or are structured is a core component of semantic memory.
*Language*
- The understanding of **vocabulary**, **grammar**, and syntax necessary for communication is a key aspect of semantic memory.
- This includes knowledge of word meanings, relationships between words, and how to construct grammatically correct sentences.
*Words*
- The meaning and definition of individual **words** are stored within **semantic memory**.
- This allows us to comprehend spoken and written language and to use words appropriately in context.
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