The eye
The
colored part of the eye is called the iris. It controls light levels inside
the eye similar to the aperture on a camera.
The
round opening in the center of the iris is called the pupil. The iris
is embedded with tiny muscles that dilate (widen) and constrict (narrow)
the pupil size.
|
Eye colour |
Pigment colour |
| Brown | Brown pigment is called melanin. The greater the amount of melanin, the darker the eyes look. |
| Blue | The iris has a colourless body so when light passes through, blue light is scattered making the eye blue in colour. |
| Green | The presence of some yellow pigment called xanthin combined with the scattered blue light gives the colour green. |
| Pink | Absence of melanin. Since there is no pigment to sheild, the blood vessels in the iris make the eye appear pink in colour. Occurs in albinos. |
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