Exploring the dualism of vision – visual function and functional vision
| 05 oct 2018
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Publicado en línea: 05 oct 2018
Páginas: 1 - 10
DOI: https://doi.org/10.21307/ijom-2019-001
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© 2019 Susan Silveira, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
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Features of the visual function assessment and the functional vision assessment
| Assessment of visual function | Assessment of functional vision | |
|---|---|---|
| Examples | Visual acuity, visual field, contrast sensitivity, dark adaptation, colour vision | Use of vision to learn orientation and mobility, daily living skills, communication, sustained near activities, and to gain visual access to information |
| Measured | Separately for each eye | With both eyes open |
| Scale | Based on stimulus characteristics | Based on response characteristics |
| Tests | Single variable under controlled, usually static conditions | Multiple variables under real-life conditions |
| Criteria | Threshold performance | Sustainable performance |
| Involves | Visual parameters only | May also reflect non-visual factors |
Profile of visual functioning
| Key vision areas | Example of vision-related functions |
|---|---|
| Ocular motor | Fixation, saccades, scanning, accommodation, refraction |
| Sensory functions | Visual acuity near and distance, contrast sensitivity, colour vision, visual field |
| Early processing | Figure ground, background ground, stereovision, matching colours |
| Interior temporal networks | Face recognition, reading words, copying pictures |
| Parietal networks | Spatial awareness, body awareness, eye-hand coordination |