What the Eye Tells the Brain

Light illuminates our surroundings and ensures that we can see fine details, recognize faces, discriminate ripe blackberries from those that need a little bit...
sunny morning environmental therapeutics

How does light work?

Light is a powerful antidepressant and is also the most powerful known zeitgeber (time-setter) for the internal biological clocks of the body. Surprisingly,...

The long-term evolution of light sensitivity from single-cell organisms to humans: What we are missing now

Evolutionary biologists assume that life arose in the earth's oceans about 3.5 billion years ago. About a billion years later,...

Vision

Human vision is a masterpiece: we can see in bright sunlight all the way down to dim starlight (this is called photopic-, mesopic-, and...