Those stars and colors you see when you rub your eyes are phosphenes

Those stars and colors you see when you rub your eyes are phosphenes

How often do you see stars and colors?┬áVisual sensations evoked by stimuli other than luminance changes are called phosphenes. Phosphenes may be an early symptom in a variety of diseases of the retina or of the visual pathways, but healthy individuals may perceive them as well. Phosphene-like phenomena are perhaps the most common side effect […]

So why do we see colors?

So why do we see colors?

We see the colors that we do because that is just about the only spectrum of light that passes through water, the area where eyes first evolved. There hasn’t been any evolutionary reason on land to see any broader spectrum “Color vision is the faculty of the organism to distinguish lights of different spectral qualities.” […]