Doctor insights on: Iris

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Iris (Overview)

The iris is a structure within the eye that helps reduce the amount of light that reaches the retina. The iris is known as the colored part of the eye, and can be blue, brown, or any color or combination of colors in between. The iris is the portion of the eye that responds to light stimulation.


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What does iris do?

What does iris do?

Light control: The iris, a circular (donut shaped) muscular ring of tissue in the front of the eye, opens and closes in response to the degree of outside light. It also functions as a portion of the focusing capacity of the eye. It's other role is as a part of your allure given its color and structure. ...Read more

Iris (Overview)

The iris is a structure within the eye that helps reduce the amount of light that reaches the retina. The iris is known as the colored part of the eye, and can be blue, brown, or any color or combination of colors in between. The iris is the portion of the eye that responds to light stimulation.


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Why is my outer iris is dark?

Why is my outer iris is dark?

Multicolored iris: It's very common for people to have variable colors in their iris. Uncommonly, the change in colors can be due to a mole on your iris. If the colors appear to be changing over time, it's important to have your ophthalmologist evaluate this further. ...Read more

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How big is the iris in millimeters?

Iris size: Iris outer dimensions= 11 x 12 mm; iris inner dimensions= 3 mm. ...Read more

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What can cause a ring around my iris?

Probably cornea: The ring is probably around the cornea, appearing like it is around the iris. It is called an arcus and is benign. Can represent high cholesterol on occasion. ...Read more

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Why is the outside of my iris darker?

Why is the outside of my iris darker?

Just color: Is it uniformly dark and symmetrical? Then do not worry, its just the coloration of the iris. The outside is thicker and denser. If you have just localized darkness then you need to see an ophthalmologist. ...Read more

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What is the dark line around the iris?

What is the dark line around the iris?

Normal: If present in both eyes it is a normal variation of pigmentation of iris. If it is new and increasing there could be some diseases that cause deposits on the cornea that may look like dark lines on the iris. ...Read more

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What does the ring around the iris mean?

Ring around iris.: Most likely the "ring" in in the cornea and represents a deposition of lipid which is very common as we get older, it has been named " arcus senilis". However there are other pathological states principally affecting the liver that may cause such ring, example being the keyser-fleisher ring, a deposition of copper in the cornea. It is commonly seen in wilson's disease and obstructive liver disease. ...Read more

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Is a brown ring supposed to be around my iris?

Is a brown ring supposed to be around my iris?

Could be normal: If you see this in both eyes, this is likely a normal variant, the way your eye pigmentation is patterned. If only in one eye, have an eye examination to get a proper diagnosis. ...Read more

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What is the definition or description of: iris?

Colored part of eye: The iris is a structure within the eye that helps reduce the amount of light that reaches the retina. The iris is known as the colored part of the eye, and can be blue, brown, or any color or combination of colors in between. The iris is the portion of the eye that responds to light stimulation. ...Read more

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Please describe these white speckles in my iris?

Please describe these white speckles in my iris?

Normal variation: Iris color comes in a terrific variety - part of the beauty of being alive. Sometimes this is reflected with whitish deposits, really structural elements, on the iris surface. Enjoy them as part of human variation - they are not pathologic. ...Read more

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Can big black dots on my green iris mean anything?

Iris dots: Black dots on the iris are most likely due to iris nevi or pigment variation. Rarely, pigmented lesions of the iris can be neoplastic in nature. Many other issues can cause iris pigment changes including topical and systemic medications. The dark spots should be monitored closely. See an eye doctor. ...Read more

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My right iris is higher than the other. Is this normal?

My right iris is higher than the other. Is this normal?

Need exam: Hard to say if this is normal for you without an eye exam and more details. Be well. ...Read more

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I need advice on what to do with this ring around my iris?

I need advice on what to do with this ring around my iris?

Iris ring: Enjoy the condition, which is most likely congenital and not related to any major disease. However, see your local ophthalmologist before going further. Colored contact lenses may give some camouflage and ordered by your eye doctor. ...Read more

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