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article: Writing for the web: Online format: Reflected vs. Projected light
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When reading a standard book or piece of paper your eyes are actually looking at light that is reflected off the paper. The light bounces off the paper and sends information to your eyeballs.

Reflected light is what we are used to, and it is how we learn to read and understand the world. Computer monitors do not reflect light, but project light. They send a light signal directly to the screen so our eyes pick up the signal in the opposite way from reflected light.

The main difference is that light is now shooting directly into our eyes, instead of gently reflecting. Our eyes get tired faster, and the whole process is agitating to the eyeball. It is not how we learned to read.

Write your text to have short line lengths and make scanning easy by “chunking your text”http://en.wikipedia.org/wiki/Chunking_(writing) and using emphasis to highlight important concepts.

Further reading

Light and colour

Additive colour vs. subtractive colour