The iris is the colored part of the eye. Pigment dispersion syndrome (PDS) occurs when pigment rubs off the back of the iris and floats freely in the eye. Pigment pieces can block the eye’s ...

Conversely, the presence of large particles or aggregates yields a yellow undertone due to poor scattering ... an ideal method for monitoring the state of dispersion of titanium dioxide paints and ...

Most birds with bright yellow or red feathers — think goldfinches and cardinals — use pigments called carotenoids to make those colors. "The reason that a bird's egg's yolk is a bright yellow ...

Pigmentary glaucoma is an eye condition in which color from the iris spreads to other parts of the eye. This color, or pigment, builds up in the eye’s tissues, preventing fluid from draining.

Urochrome, a pigment in urine, causes its yellow color. Drinking liquids can dilute the color, so bright yellow pee may indicate dehydration. Some vitamins, medications, and health conditions can ...

Concern over the discoloration of Michael Jordan’s eyes rebounded after fans noticed yellow pigment in the retired NBA star’s eyes at a soccer match in Monaco against Barcelona, but experts ...