Your Iris : NOW A BIOTECHNOLOGY TOOL
The iris is the noticeable circular and colored part of the eye. It has central hole usually seen as black colour ( but not black actually), the hole is called the pupil and the opening and closing of the pupil controls the amount of light entering the eye. The iris has a ring of muscle fibers around the pupil such that when the muscles contract, it causes the pupil to constrict (become smaller). This occurs in bright light or under the sun.
The second set of muscle fibers radiate outward from the pupil. When these muscles contract, the pupil dilates (becomes larger). This occurs under reduced illumination or in darkness. You can actually demonstrate this on mirror by shining light on and away from the eye.
Looking straight at the eye, you can safely assume the iris is located in front of the eye however that’s not true, the iris is located between the cornea and the lens.
The amount of pigment contained in the iris determines eye colour. When there is very little pigment, the eye appears blue. With increased pigment, the colour becomes deep brown to black. This is also explains why black has a brown eye colour.
Iris for recognition.
The iris once developed from birth doesn’t change pattern regardless of aging and also the pattern of iris of each individual is different, so your iris pattern can never match another’s, just like finger prints. Therefore iris are used in technology for identification and verification of identity. This feature now exists in recent mobile phones where you have the iris unlock ( Samsung devices) or face ID (apple devices).
Now, you have an idea of what your iris is and how it works
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