G106 – Background screens should not be pure white or change rapidly in brightness between screens.

Standard

Guideline:

Background screens should not be pure white or change rapidly in brightness between screens.

Guideline Description:

Aging process brings some visual impairments. Reading text  on a computer can represent an difficult task. The older users not only have difficult to read characters too small but also standard white screen can hamper this task. Older adults also adapt more slowly to changes in illumination, so the rapidly changes  in brightness between screens should be avoided.

Example:

example_g106_

Some examples of colors combination to avoid, and a good example of colors combination.

Source:

Designing touch-based interfaces for the elderly,2010

Tags:

Colors, Content, Elderly, Graphics, Layout, Screen.

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G105 – Blue and yellow or red and green tones should be avoided. Warm colors are the most suitable.

Standard

Guideline

Blue and yellow or red and green tones should be avoided. Warm colors are the most suitable.

Guideline Description:

Blue and yellow combinations should be avoided, given that many users (including the older adults and young’s) can suffer from tritanopia i.e. a visual defect that causes inability to discern blue and yellow.

Green and Red combination should also be avoided, once that many users can suffer from protanopia and deuteranopia, i.e. a visual defect  that  causes inability to perception of red and confusion of red with green.

Excluding the aspects mentioned before, the use of colors with long-wavelength end of spectrum (i.e. “warm” colors) are most perceptible than the use of short-wavelenghts (“cool” colors).

Example:

example_g105_Visible spectrum of users with protanopia, tritanopia and identification of  “warm” and “cold” colors.

Source:

Designing touch-based interfaces for the elderly,2010
Design Principles to Accommodate Older Adults,2012

Tags:

Colors, Content,  Elderly, Graphics, Layout, Vision.

G91 – Use colors with a good contrast. Colors should be used conservatively.

Standard

Guideline:

Use colors with a good contrast. Colors should be used conservatively.

Guideline Description:

A good contrast of colors used in a user interface is crucial for a correct viewing by older adults, in particular older adults with visual acuity limitations. So in the user interface should be used a sufficient degree of contrast between the background and the foreground. One way to achieve this goal is using highly contrasting colors schemes, such as negative (light text on dark background) or positive (dark text on light background) polarities. Both polarities have similar levels of readability, but it has been noticed that negative polarity is slightly easier to read on the screen.

Example:

examplo G91An example of an application using  a negative high contrast color scheme.

Source:

Design of Unimanual Multi-Finger Pie Menu Interaction,2011
Designing touch-based interfaces for the elderly,2010
Touch Screens for the Older User,2011
Design Principles to Accommodate Older Adults,2012
Design Recommendations for TV User Interfaces for Older Adults: Findings from the eCAALYX Project,2012

Tags:

Colors, Content, Elderly, Graphics, Layout.

G73 – Use high contrast between the elements of the user interface. A high contrast between the foreground and background should exist.

Standard

Guideline:

Use high contrast between the elements of the user interface. A high contrast between the foreground and background should exist.

Guideline Description:

The choice of a good contrast of colors influences the viewing of the user interface, in particular by older adults having visual acuity limitations. So, to face these limitations , in the user interface should exist  a high contrast between the background and the  foreground.

Example:

exemplo G73An example of an application that providing a higher contrast between the button color (light green) and the background color.

Illustration adapted from Designing touch-based interfaces for the elderly

Source:

Healthcare TV Based User Interfaces for Older Adults, 2010
Designing touch-based interfaces for the elderly,2010
Touch Screens for the Older User,2011
Design Principles to Accommodate Older Adults,2012
Design Recommendations for TV User Interfaces for Older Adults: Findings from the eCAALYX Project,2012

Tags:

Colors, Content, Elderly, Graphics, Layout.