Recognizing heterochromia is fairly simple. One needs only to gaze directly into someone's eyes. At first glance, it will be ...

Like most human traits, blue eyes are determined by genes, and no two people have exactly the same hue. It works a lot like ...

Eye color, which is a result of iris pigmentation, doesn't affect the quality of vision. Research shows that the shape of the eyeball, the state of the lens, and the health of the retina are the ...

By keeping the bulb in the center and orbiting the blue gel (for the iris) and the opaque disk (for the pupil) around the bulb, the eye can appear to gaze in different directions. By adjusting the ...