the colour brown change to bleuish in native people eyes when they get into there late 50 why his that?
413890
the same as why hair turns Grey the cells that produce the brown pigment stop working as well as when you are young or it could be a cataract
339023
Brown eyes\n \nBrown eyesThe vast majority of the world's people have dark eyes, ranging from brown to nearly black. Light brown eyes are also present in many people, but to a lesser extent. 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
123890
My doctor says they just come from old age.  We are all working up a nice pair of cataracts as we go through life.  If we live long enough, we will all need our lenses replaced.\n_______________________________________________\nThe following is cut and pasted:\nAge-related cataracts develop in two ways:\n\n1. Clumps of protein reduce the sharpness of the image reaching the retina.\n\nThe lens consists mostly of water and protein. When the protein clumps up, it clouds the lens and reduces the light that reaches the retina. The clouding may become severe enough to cause blurred vision. Most age-related cataracts develop from protein clumpings.\n\nWhen a cataract is small, the cloudiness affects only a small part of the lens. You may not notice any changes in your vision. Cataracts tend to "grow" slowly, so vision gets worse gradually. Over time, the cloudy area in the lens may get larger, and the cataract may increase in size. Seeing may become more difficult. Your vision may get duller or blurrier.\n\n2. The clear lens slowly changes to a yellowish/brownish color, adding a brownish tint to vision.\n\nAs the clear lens slowly colors with age, your vision gradually may acquire a brownish shade. At first, the amount of tinting may be small and may not cause a vision problem. Over time, increased tinting may make it more difficult to read and perform other routine activities. This gradual change in the amount of tinting does not affect the sharpness of the image transmitted to the retina.
674300
>>>> Why do chinese people have chinky eyes?\n\nAcceptable common terms are slanted, slit or (preferably) Mongoloid. Chinky is just plain offensive.\n\nAnyway Chinese people have slit eyes because the skin beneath the eyelid fold  folds upwards over the eye to some degree, producing a partial third eyelid know as an epicanthic fold.\n\nWhy do Chinese people have an epicanthic fold? Because humans evolved with an epicanthic fold. That particular feature isn't restricted to the Chinese, it is found amongst all East Asians and Native Americans and perhaps most surprisingly is also normal in the Khoi-San peoples of Africa. It is assumed that the first humans had the same basic eye shape found today in Chinese and San. Other human populations have since mutated in such a way that the epicanthic fold has been lost while Asians and San retain the ancestral condition.\n\n>>>>Why are there white people and black people?\n\nThere aren't. There are only two major skin types in this world: brown and not-brown.\n\nThe ancestral skin colour is assumed to be the brown colouration seen mostly amongst the Khoi-San and some South-East Asian populations but also fairly common amongst North-Western Europeans.\n\nThe brown skin type maintains the colour producing units of the skin in discrete clusters. The non-brown skin types have those colour producing units spread throughout the skin evenly.\n\nBlack and white skin are both largely the same, and both are of the non-brown type. the only difference is how much melanin the skin produces. There is no point at which you can say that a skin type stops being brown and becomes white as there is with the difference between brown and non-brown skin colours.\n\n\nThe reason some people have darker skin is because the skin has produced more melanin. People at the equator tend to have darker skin than people living further north or south, but it's a very poor relationship.\n\n\nThose people telling you that black skin relates to life in warm climates obviously aren't thinking. Brazilian Indians live in warm climates but they don't have black skin, and Tasmanian Aborigines live in cold climates and they do have black skin.  Skin colour has very little to do with climate and a lot to do with ancestry.
309268
Yes it is true.  Melanin is a wonderful thing when it comes to aging.  That an the fact that black people don't subject their skin to the harshness of the sunlight in the way that some do.
626058
Since it is believed that people are originally from Africa, dark colored skin would have been the norm.  However, as people migrated north they weren't getting as much sun because they had to cover up to keep warm.  However, black people who get very little sun develope vitamin D deficiency because your body requires sunlight to make the last step of the synthesis go.  So, their skin needed to let more light in and it was beneficial to them to evolve lighter colored skin.  \nHave you noticed (part of it is interbreeding with white people, of course) that American blacks, who have been in the US about 200 years, are not nearly as dark black as native Africans anymore?
76008
There was a time when people were hunter-gatherers and lived a nomadic lifestyle.  Because of this, the population spread throughout the world.  Over time, peoples' skin colors changed to adapt to the amount and intensity of the sun where they lived.   For example, people closer to the equator developed darker skin because they got a lot of sunlight and people closer to the poles developed lighter skin because they got a lot less sunlight.  That's why people have different skin colors.  \n\nWhy do people marry when we are really all distant relatives?  Well, if the Biblical accounts are to be accepted, the simple truth is that we do marry our far-distant relatives.  In fact, in the South, when a person marries, one of the questions on the marriage application is, "are you related by blood?".  It is not uncommon in that area of the country, and is allowed by law, for second cousins to marry.
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i stand corrected (looked up answer). its rare but possible.  \n\nEye color is an inherited trait influenced by more than one gene.[6][7] There seem to be three genotypic eye colors (brown, green, and blue) in humans.[3] 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.[6][8] Three gene pairs coding for human eye color are currently known: EYCL1, EYCL2, and EYCL3.[9][10]\n\nhttp://en.wikipedia.org/wiki/Eye_color#Determination_of_eye_color\nhttp://www.biosci.ohio-state.edu/~pfuerst/courses/eeobmg640/reading1eyecolor.pdf
903682
My co-worker told me its because the bodies take longer to start to turn.  Pigment and such.
72771
About the colour - can't be from surfing or from the sun. Two possible explanations:\n1) You had the gene from one of your parents fully expressed, and now the other parent's gene kicked-in and the colour of your eyes changed (happens a lot with hair colour).\n2) Ask your friends and find-out whether you all eat some kind of food regularly, especially red or orange vegetables. These vegetables have a stuff called carotene in them, and when you eat a lot of it your eyes tend to get coloured orange and a bit lighter. This is not dangerous in any way, but if you want it to stop just eat less carrots/tomatoes/etc.\n\nGood luck :).
14575
Eye color is a complicated trait, because it is controlled by several genes. It is likely that all of the genes have not yet been found. So far, scientists have a model in which one gene can either be blue or brown, with brown being dominant, and the other gene being blue or green and green being dominant. The brown trait from the first gene overrides either blue or green on the second. So, if someone has the brown trait, they have brown eyes. This model obviously fails to explain hazel, gray, and various other multi-shaded eye colors.\n\nWhat these genes do is turn on melanin production in the eye, the same thing that determines skin color. The more melanin, the darker the eyes. The reason a baby's eye color changes is it is born with very little melanin, both in its skin and in its eyes. As it is exposed to sun, melanin production increases until they've reached the skin and eye color their genes code for.\n\nThis is unrelated to hair color, which is controlled by several genes as well.
128118
To steal an answer recently posted by someone else, it simply comes down to the lack of need for dark pigmentation at high latitudes.\n\nAt low laititudes the risk of death or illness from skin cancer is higher than the risk of death from rickets. As a result people who lived at low latitides retained dark pigmentation since that provides portection from skin cancer. \n\nNote that it isn't only Asians that retained this trait.  Southern Europeans are no more or less prone to having dark hair than Asians.\n\nAt higher latitudes the risk from skin cancer declined and the risk of rickets increased. Having pale skin reduced the incidence of rickets, so pale pigmentation evolved through a reduction of eumelanin\n\nOne of the side effects of of low eumelanin levels is that it allows for multiple hair colours as well. With no eumelanin at all hair can be blonde, or it can be red colours that are difficult to achive in skin that  has high levels of eumelanin. With moderate levls hair can be brown, and with normal levels the hair can be black.\n\nPeople with normal eumelanin production can only really have one hair colour: black. That's because eumelanin covers over any other pigments.\n\n\nYou will note that it isn't only Asians who have almost exclusively black hair. It is equally Negroes, San, Aborigines, American Indians, Negritoes and so forth. European were freed up by their pale skin to express a range of skin colours not seen in normal humans.\n_________________\n\nMay said "the alleles are inherited and contained in the >>>>>>>same race."\n\nUtter Bollocks. If you are going to answer a question at least have some idea what you are talking about.\n\nThere is no such thing as a biological race. There are no alleles for black hair that are contained within the Asian race.
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Most babies have blue eyes when they are born and then their eyes darken as they age.\n\nWhen someone has two eyes of a different color it is pretty rare and usually results from some sort of genetic loss of pigmentation or can result from eye trauma.\n\nThe basis of eye color mostly has to do with melanin pigmentation.  If you have a lot of melanin you have brown eyes if you have very little you have blue eyes.  Everyone else is somewhere in between except people with green eyes which can result from flecks of yellowish fatty pigments against a dark background.
520332
It's a question of genetics. Different genes will lead to different quantities of various substances produced and present in some part of your body. Eye color is mainly determined by the pigment melanin (the same that gives you a tan when you lie in the sun). \n\nIf your eyes have a lot of it, they're brown. If they don't, they're blue. Green eyes result from yellowish flecks of a fatty pigment against a dark background, and no melanin.\n\nThere you go :-)
572115
Their skin is a differnt colour.
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It's genetic in most people.\n\nThe second main cause is a change in melanin levels in one eye, this can be because of illness or trauma to the head.\n\nFor others a trauma to the head can jolt the blood vessels in the eye causing a change in colour
723382
First of all, eye color can change with age. Second, it's more complicated that the simple brown / blue description that they give in high school biology class. So I suspect that the answer is yes.