A patient with a visual field of 8 degrees from the point of fixation meets the WHO clinical definition for low vision. What is the other primary metric used for this assessment?

The other primary metric is visual acuity , which must be 20/70 or worse in the better-seeing eye after the best possible optical correction is applied.

Which five distinct visual functions are included in the ICD-11 classification of visual impairment?

The ICD-11 recognizes that impairment is multifaceted, including: Visual Acuity Visual Field Photosensitivity Color Vision Contrast Sensitivity

A patient has a measured distance visual acuity of 6/18. Based on standard severity classifications, how is this level of visual impairment categorized?

A visual acuity of 6/18 falls into the Moderate visual impairment category. This range is defined as worse than 6/12 to 6/60.

What is the primary difference between the legal definition of blindness in the USA compared to the Philippines?

In the USA , legal blindness is defined as visual acuity Philippines , the threshold is more restrictive, defined as <= 20/400 or a field < 5 degrees.

How does the World Health Organization (WHO) define the threshold for legal blindness in terms of visual acuity?

The WHO defines legal blindness as a visual acuity that is worse than 20/400 in the better-seeing eye after the best possible correction.

Why is it important to distinguish between a 'Visual Disability' and a 'Visual Handicap' in a patient with a chronic eye condition?

The distinction lies in impact: Visual Disability refers to the inability to perform specific functional skills (e.g., reading, ambulating). Visual Handicap refers to the resulting psychosocial and economic barriers an individual faces when interacting with their environment.

Which of the following would be considered an 'acquired' condition leading to functional visual impairment: Retinitis pigmentosa or Age-related macular degeneration?

Age-related macular degeneration is considered an acquired condition. Retinitis pigmentosa is classified as a hereditary condition.

In the progression from disorder to handicap, which category best describes the inability to perform basic personal hygiene?

This represents a Visual Disability , as it specifically identifies a limitation in performing essential skills or Activities of Daily Living (ADLs) .

If a patient is measured at N6 near vision, what does this indicate regarding their current visual status?

N6 is a standard measurement for near vision at 40cm. Assessing near vision is critical because distance acuity alone may not fully reflect a patient's functional ability to perform close-range tasks like reading.

How does the 'disorder to handicap' model assist a clinician in developing a rehabilitation plan?

It provides a holistic framework: the clinician addresses the anatomical disorder , mitigates the functional impairment , trains the patient to overcome disabilities (skills training), and provides support to reduce environmental handicaps .

Why might a patient with 20/40 acuity still report significant difficulties in daily life, suggesting a need for low vision assessment?

While 20/40 is often considered normal/mild, the patient may have deficits in other visual functions like contrast sensitivity or color vision , which are not captured by acuity charts but significantly impact functional performance.

What is the primary anatomical difference between a visual disorder and a visual impairment?

A visual disorder refers to the underlying anatomical or pathological change in the eye, whereas a visual impairment describes the resulting loss of a specific visual function or capability.

If a patient's visual field is 4 degrees from the point of fixation, does this meet the WHO criterion for blindness?

Yes. The WHO defines blindness criteria as acuity worse than 20/400 OR a visual field of from the point of fixation. Therefore, 4 degrees satisfies the criteria.

Clinical Assessment And Functional Classification Of Visual Impairment Flashcards

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Clinical Assessment and Functional Classification of Visual Impairment

This deck covers the foundational clinical criteria, legal definitions, and functional classifications of visual impairment, helping professionals understand the continuum from anatomical disorder to social handicap.

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by @huhu_haha

Q: Why is the use of 'best possible correction' a mandatory prerequisite for diagnosing visual impairme...

Q: A patient with a visual field of 8 degrees from the point of fixation meets the WHO clinical definit...

Q: How does the functional definition of low vision differ from the clinical definition provided by the...

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