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Vision

You cannot create efficient screen interaction unless you understand the human eye. Our courses build from an understanding of fundamental rules and concepts. This makes the material easier to understand and apply, and provides greater long term benefits.

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1 While looking at any location on a screen, you only see a small area in detail, the rest is really blurred as simulated in this screen image.

2 Things that move can kill you so the mammalian visual system is optimized to detect change. Also, to find fruits and berries, human eyes can detect the color of something even when we cannot see any detail.
3 The human eye is not a camera. The perception of color is a complex process and not the wavelength of light falling on the eye. This demo shows the influence of the background.
4

"Color blindness"* is far more common than most people think. Failure to allow for it can have serious consequences such as making a web site unusable to a significant percentage of people. Click on the image to see how a web page might appear.

*This commonly used term is misleading as it implies that these people see in black and white which is not true. They see colors differently than the majority of people. "Anomalous color vision" would be a better term
5

The most rapidly growing group on the web is the elderly.

 

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updated 16 March, 2004