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Designing for the Life Span Segment 3

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Slide 12 of 74

Slide 12 Content

Changes to the Eye result in the following changes in acuity and perception:

• Loss of ability to discriminate fine detail.
• Heightened susceptibility to glare in all forms.
• Loss of ability to discriminate close distances- a flattening of space- especially steps and curbs.
• Less ability to discriminate closely related colors.
• Loss of ability to see the actual saturation or intensity of all color.
• Loss of sensitivity to blue light and blue color in pigment (graying out).
• General lessening of the ability to process complex visual information from the environment when differing information overlaps or is in conflict.

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Age related changes in the ability to perceive objects and space visually may require more time to process information. For example, older drivers with slow light adaptation, drive at slower speeds to cope with that perilous environment. Likewise, older people walking more slowly than others will tend to move away from the middle of pedestrian traffic and move closer to boundaries such as walls to avoid problems of interference in heavy foot traffic.

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