Low Vision pp 490-501 | Cite as

Low Vision Performance as a Function of Task Characteristics

  • Shelly Marmion
Conference paper


A crucial component of the rehabilitation process for low vision persons is the enhancement of visual function through the optimization of residual vision. Intervention strategies of potential benefit are numerous. CORN [1] has proposed a model of low vision visual functioning describing the process as having three distinct components or dimensions, each of which can be subject to intervention. These include (1) Visual Abilities, consisting of the five physiological components of vision, (2) Stored and Available Individuality, consisting of aspects of the individual which impact on performance, and (3) Environmental Cues, consisting of object attributes which determine their visibility. Intervention techniques related to this third dimension have considerable potential in terms of both practical value and widespread applicability, being perhaps the easiest and least expensive of interventions to effect. However, despite this potential, much is still known about the relative benefits of specific environmental modifications to the enhancement of residual vision, and the extent to which facilitative effects are consistent across differing visual conditions and tasks.


Variable Effect Stimulus Effect Visual Performance Stimulus Size Target Speed 
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© Springer-Verlag New York Inc. 1987

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  • Shelly Marmion

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