Although pigmented the Iris itself is actually partially transparent in color

In most cases, when discussing eye problems, the discussion will turn, at one point or another, to the topic of the iris. However, what is the iris, and why is it so relevant to vision problems?

The Iris is the circular pigmented tissue around the pupil of the eye. It is also the most visible part of the eye. Although pigmented, with colors like red, gray, blue, green, hazel, brown and black, the iris itself is actually slightly transparent in color. Thus, the iris acts as the person's eye color.

Wearing any number of different contact lenses, most noticeable color contacts and novelty contacts, it is now possible to change the color of a person's iris to a color other than that which is their natural color. More complicated than this, however, is when the color of a person's iris is different in each eye. In Latin, this is called heterochromia iridis, and, whilst being perfectly normal, is a condition that was suffered by such people as Alexander the Great and David Bowie, in more recent times.

The iris plays an important function in that it is the part of the eye that actively permits the pupil to open and close on a continuos basis. It does this so that the iris can control the level of sunlight striking the retina of the eye.

As you can see then, the iris play an important function in the mechanism of the workings of an eye. Further, it is especially important when it comes to time to consider whether to wear green, blue or brown colored contact lenses!

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