Today in my psych class we started vision. My psych class is that recommended one for GD majors - Psych 230 - Perception and Sensory Processes.
Here's the cool shit I learned today:

• 70% of the information from the world comes in through the eyes. So if you count up all of the sensory receptors in the human body, 70% of them are being used in and through the eyes. So therefore, vision is such an important thing.
• The upper spectrum of light - red wavelengths - are hardest to be absorbed by rods in the retina. Rods respond better to blue [and a bit to green] and very little to red. But if we are talking about the upper spectrum of light, then yellow is the easiest to see from that.
  
• People with lighter colored eyes get worse red eye when in pictures because their light eyes absorb more light in. And we can see that in our friend Andy who has amazingly blue eyes that make him look like satan in pictures.