eye's red or blue why?

Question

maximum-black,brown and like this
minimum-light brown
some time 1000:1 person - red,blue (without contect lence's)

Answer 1

Determination of eye color
Eye color is an inherited trait influenced by more than one gene. There seem to be three genotypic eye colors (brown, green, and blue) in humans. Although it was once thought that brown eye color was always dominant and blue eye color was always recessive, the fact that two blue-eyed parents can give birth to a brown-eyed child has shown that the determination of eye color does not follow the simple rules of Mendelian inheritance. Three gene pairs coding for human eye color are currently known: EYCL1, EYCL2, and EYCL3.

Classification of colors :
The perception of color depends upon various factors. These are the same eyes; however, depending on the light and surrounding hues, the eye color can appear quite different. There is a copper ring around the pupil.Iris color can provide a large amount of information about an individual, and a classification of various colors may be useful in documenting pathological changes or determining how a person may respond to various ocular pharmaceuticals. Various classification systems have ranged from a basic "light" or "dark" description to detailed gradings employing photographic standards for comparison. Others have attempted to set objective standards of color comparison.

As the perception of color is dependent upon the conditions in which color is viewed (e.g. the amount and type of illumination, as well as the hue of the surrounding environment), so is the perception of eye color.

Eye color exists on a continuum from the darkest shades of brown to the lightest shades of blue. Seeing the need for a standardized classification system that was simple, yet detailed enough for research purposes, Seddon et. al developed a graded one based on the predominant iris color (brown, light brown, green, gray, and blue) and the amount of brown or yellow pigment present.


Brown :
Dark brown human iris. Brown human iris. The color was dropped from the image outside of the iris.In humans, brown eyes contain large amounts of melanin (primarily eumelanin) within the iris stroma which serves to absorb light, particularly at the shorter wavelengths. Very dark brown irises may appear to be black.

Brown is one of the most common eye colors and, in many populations, it is the only iris color present.

Those with non-European ancestry generally have darker eyes and less variability in eye color than those of European descent. Most of the original inhabitants of Africa, Asia, and the Americas have brown eyes. Brown eyes are also found in Europe, Oceania, and North America, though within European populations they are not predominant to the same extent. Brown had been considered to be the most dominant eye color in any gene, but new studies have revealed that this is not always true.


Hazel
A hazel eye.Hazel eyes are the product of moderate amounts of melanin. A number of studies using three-point scales have assigned "hazel" to be the medium-color between brown and blue.This can sometimes produce a multicolored iris, i.e., an eye that is brown near the pupil and green on the outside.

There is some difficulty in defining the eye color "hazel" as it sometimes considered to be synonymous with brown and other times with green. They have been described as light brown or yellowish brown, or as a lighter shade of brown. Hazel eyes have also been described as being equivalent to blue/gray.


Amber and yellow
A cat's iris which is amber colored. Amber human eyes displaying the milky greenish yellow and russet/coppery tint.Amber colored eyes are of a solid color and have a strong yellowish/golden and russet/coppery tint. This might be due to the deposition of the yellow pigment called "lipochrome" in the iris (which is also found in green and violet eyes). Amber eyes are much more common in other animals than they are in humans. They are also nicknamed "cat eyes."

The yellow eyes of some pigeons contain yellow fluorescing pigments known as pteridines. The bright yellow eyes of the Great Horned Owl are thought to be due to the presence of the pteridine pigment xanthopterin within certain chromatophores (called xanthophores) located in the iris stroma.





Green
Green eyesGreen eyes are also the product of moderate amounts of melanin.

Green eye color has been linked to brown hair color.

Green eyes are most often found in people of Celtic, Germanic, and Slavic descent, and to a lesser extent southern Europe.[citation needed] Green eyes are also found, though in much lower proportions, among other Caucasian populations in the Middle East and South Asia.They are so common among Pashtuns that in Pakistan, Pashtuns are often called "Hare Ankheian Vaale": those with green eyes (Urdu translation). They may also be found in many areas of Afghanistan (the native land of the Pashtuns) and parts of India - most common in the north, with the highest percentages respectively in Punjab, Uttar Pradesh, Gujarat, and Rajasthan.

One of the most famous photographs ever published by National Geographic was a close-up of Sharbat Gula, a Pashtun girl with startling green eyes, taken in western Afghanistan by Steve McCurry in 1984.Details of her irises captured by the photograph were used to confirm her identity after she was relocated in 2002.

Gray

Gray eyes. Steel blue-gray eyes.Gray eyes are a variant of blue eyes.A gray iris may indicate the presence of a uveitis.


Blue

Blue eyes are relatively common throughout Europe, especially in Northern Europe, including the northern Baltics and in East Central Europe.Blue eyes contain low amounts of melanin within the iris stroma; longer wavelengths of light tend to be absorbed by the underlying iris pigment epithelium and shorter wavelengths are reflected and undergo Rayleigh scattering. The type of melanin present is primarily eumelanin.

Blue eyes are found mainly in people of northern European and eastern European descent, and to a lesser extent, in people of southern Europe, the Middle East and Central Asia, most commonly in people who live at higher elevations. South Asians may also have blue eyes, but this is uncommon, except amongst Pathans in Afghanistan, Pakistan, and India.It also occurs in other Indians and Pakistanis, generally in highest percentages among Punjabiis - though even then it is not exactly common. Finland and Lithuania have the highest proportions of blue-eyed people, with at least 80% in both countries respectively.[citation needed] Ireland and Great Britain also have high proportions of blue eyes, with estimates of around 70% for Ireland and about 60% for Britain.

A blue-green human eye.Blue is the color of the indole monomer that when polymerised forms melanin. both alleles for brown eyes (a polymerase gene) are absent or damaged, the blue color remains.[citation needed] The inheritance pattern followed by blue eyes is thought to be similar to that of a recessive trait.

A 2002 study found the prevalence of blue eye color among non-Hispanic whites in the United States to be 57.4% for those born between 1899 and 1905 compared to 33.8% for those born between 1936 and 1951.

One survey estimated that nearly 90% of Icelanders have blue or green eyes.

As melanin production generally increases during the first few years of life, the blue eyes of some babies may darken as they get older. Eye color typically stabilizes by 6 years of age.


Violet eyes

The appearance of violet eyes is thought to occur due to the mixing of red and blue reflections. Some albinos have eyes that appear to be violet.Elizabeth Taylor's physical trademark is her "violet" eyes.

Answer 2

well this is a tricky question but think why is every body is different color? if you know why maybe that is the answer for this. JK. i am not a doctor but i know why, the eye colors form the same color as your hair color or your body color. there is no blue eyes, if they are its mean it shows different color. the tissue in your body makes the eye color.

Answer 3

eyes are red when a person is in anger.
Eyes are blue when a person has receives a sound beating from someone else

Answer 4

You need to edit and ask your question differently..it makes no sence...eye color is determined by genetics if that is what you are asking?

Answer 5

the colour of the iris in the eye determines the eye-colour. this is controlled by genes
http://encarta.msn.com/encnet/refpages/search.aspx?q=iris&Submit2=Go

Answer 6

I Don't understand your question.

Answer 7

its in the gene's