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Functional considerations in evaluation and treatment of the client with low vision.

In evaluating and treating clients who have low vision, the occupational therapist must consider factors in addition to typical measures of the client's visual acuity, field loss, and oculomotor control. It is important to consider the functional implications of the client's ocular pathology, including illumination needs, contrast sensitivity, sensitivity to glare, and need for magnification as well as environmental factors such as the amount of pattern in a visual task, the amount of lighting and contrast available, and the conditions under which the task is performed. These factors are all relevant to occupational therapy low vision rehabilitation because each may influence the way in which a client uses his or her residual vision and achieves successful adaptation. This article provides an overview of these factors and presents a suggested protocol for evaluation of the client with low vision.