BRS Evaluation of Visual Impairment 2 — Questions and Answers
Question 1: When assessing contrast sensitivity in a patient with low vision, which spatial frequency range is most critical for face recognition?
- High spatial frequencies (12–18 cpd)
- Mid spatial frequencies (3–6 cpd) (Correct answer)
- Very low spatial frequencies (0.5–1 cpd)
- Ultra-high spatial frequencies (>18 cpd)
Correct answer: Mid spatial frequencies (3–6 cpd)
Mid spatial frequencies (3–6 cycles per degree) carry the critical information needed for recognizing faces and many functional tasks.
Question 2: A BRS practitioner uses the Pepper Visual Skills for Reading (PVSR) test. What does this test primarily assess?
- Contrast sensitivity thresholds
- Eccentric viewing stability and reading efficiency with low vision (Correct answer)
- Color discrimination under scotopic conditions
- Binocular summation ratios
Correct answer: Eccentric viewing stability and reading efficiency with low vision
The PVSR assesses whether a client can use eccentric viewing effectively and measures reading efficiency relevant to low vision rehabilitation.
Question 3: Which of the following best describes 'crowding' (contour interaction) in the context of visual impairment evaluation?
- Reduced acuity caused by refractive error at the fovea
- Decreased letter recognition when flanking letters are placed nearby (Correct answer)
- Loss of peripheral field due to glaucomatous damage
- Impaired dark adaptation in patients with retinitis pigmentosa
Correct answer: Decreased letter recognition when flanking letters are placed nearby
Crowding refers to impaired recognition of a target letter or symbol when flanking elements are placed in close proximity, commonly seen with eccentric viewing.
Question 4: A functional vision evaluation documents that a client has a 'preferred retinal locus' (PRL). Which statement about PRL is most accurate?
- A PRL always develops in the superior visual field regardless of lesion location
- A PRL is an area of intact or relatively intact retina used in place of a damaged fovea (Correct answer)
- A PRL is synonymous with the blind spot in patients with macular degeneration
- A PRL can only be identified with microperimetry and not behavioral observation
Correct answer: A PRL is an area of intact or relatively intact retina used in place of a damaged fovea
A PRL is a retinal area outside the damaged fovea that the patient habitually uses for fixation, and it can be identified through both microperimetry and careful behavioral observation.
Question 5: During an evaluation, a client reports difficulty reading standard print but can read with a CCTV. This finding most directly informs which rehabilitation need?
- Need for orientation and mobility services immediately
- Need for electronic or optical magnification for near tasks (Correct answer)
- Need for auditory substitution as the sole adaptive strategy
- Need for glaucoma surgery referral
Correct answer: Need for electronic or optical magnification for near tasks
Success with a CCTV indicates the client can benefit from magnification technology for near tasks, guiding prescription of optical or electronic low vision aids.
Question 6: The Berkeley Rudimentary Vision Test (BRVT) is used for clients who cannot complete standard acuity charts. What does it measure?
- Stereopsis at near distances
- Detection of light, motion, and large-form grating acuity at very low vision levels (Correct answer)
- Photopic contrast sensitivity at 6 meters
- Central scotoma size using Amsler grid
Correct answer: Detection of light, motion, and large-form grating acuity at very low vision levels
The BRVT measures rudimentary vision functions—light perception, light projection, motion detection, and grating acuity—in patients with profound visual impairment.
Question 7: When documenting visual fields for a client with hemianopia, a BRS specialist records that the client has a 'macular sparing' presentation. This means:
- The client retains central vision within a few degrees even though one hemifield is lost (Correct answer)
- The client's macula has been surgically relocated to the intact hemifield
- The client has complete loss of all central and peripheral vision on one side
- The client cannot read because of bilateral macular degeneration
Correct answer: The client retains central vision within a few degrees even though one hemifield is lost
Macular sparing in hemianopia means that a small central region of the affected hemifield is preserved, often improving reading and face recognition prognosis.
BRS Evaluation of Visual Impairment 2
When assessing contrast sensitivity in a patient with low vision, which spatial frequency range is most critical for face recognition?