We are least sensitive to the blue-violet end of the spectrum and I have only seen these colors well on extremely rare occasions. Color film does not have the same limitations of our human vision and is able to record even faint colors that might evade us visually. Many times I have taken photos of seemingly colorless auroras and been surprised to find beautiful hues that went undetected. Sometimes the color might be just on the brink of visibility but quite vivid on film. On special occasions when the aurora is extremely bright it crosses the threshold into our world of color vision and can then show colors that I can only describe as the purest laser light imaginable.
Carrots are rich in beta carotine which is converted in the body to vitamin A or retinol .
This is an essential vitamin for healthy vision. It helps us with contrast, seeing colors and our night vision. Click here for more on photo sets .