The Iris: Facts You May Not Know!

Eyes have long been referred to as “windows to the soul”. The iris is one of the most interesting parts of the human eye. People are often distinguished by the colour of their eyes, blue, green, brown or grey. However, the iris is responsible for more than just the way a person appears, this important part of the eye consists of muscle tissue and pigments that functions as a light regulator.

The iris controls the pupil, causing it to constrict or dilate. The iris is responsible for restricting how much lights get passed into the retina. For example, when its too bright outside, the iris contracts and allows less light in the eye and vice versa at night.

Eye Colour

The colour of an eye is determined by the melanin, or pigment, that is present in the eye. When there is lots of melanin the eye colour will be darker, and therefore with less, the eye is lighter. Colour is also determined by inherited genes and the age of a person. A person under the age of 3 are still producing eye pigments, therefore their eyes can change as they get older.

Heterochromia

Heterochromia is an eye condition that’s distinguished by having two different colours, one in each eye. Heterochromia of the eye is caused by variations in the concentration and distribution of melanin, the pigment that gives colour to the skin, hair, and eyes. Most cases of heterochromia are present at birth; however, some cases of genetic heterochromia are linked to diseases and syndromes.

Iridology

Iridology is the study of the iris and how changes in its appearance over time are linked to health issues. The study explores the iris’s ability to reveal physiological conditions, health risks, challenges and or strengths of various organs and personality traits.

Changing the colour of your eye

There are surgical procedures people can have to change the colour of their eye. However, this is most commonly done for people with extremely light eyes, making them darker to reduce their sensitivity to light.  Although, it is becoming increasingly popular for cosmetic reasons. It is a relatively new and controversial practice. There is another procedure currently undergoing clinic trials, changing brown eyes to blue using low-energy laser. This is not yet available to the public.

 Iris Disorders

The iris is just as vulnerable to infections and disorders as are other parts of the eye. If affected, your vision may be compromised. Disorders can be from both damage or congenital iris defects such as Aniridia and Iris Coloboma. If your iris is damaged, whether it be from hitting your eye or a foreign body, if compromised too much light passes through causing difficulty focusing and can be like glaring into a headlight.  

 It is important to have regular eye exams to ensure the iris is healthy and functioning properly. Speak to one of our optometrists today to book your comprehensive eye health exam. All eye health exams are completely covered by Medicare. Book Today!