| |
Blue eyesEye color is a physical trait that is genetically determined. A favorite pastime for many expectant parents is documenting the eye color of grandparents and extended family members to attempt to predict the eye color of their baby. Any discussion of the inheritance of eye color requires a review of genetics. In basic terms, eye color is determined by the amount of a pigment called melanin that is in the iris of the eye. Brown eyes have lots of pigment, blue eyes very little. The
amount of pigment is determined by a number of genes controlling pigment production. Generally speaking, brown is dominant, meaning that if one parent has brown eyes and the other has blue eyes, the baby will most likely have brown eyes. But the situation is really much more complicated than that.
Why blue eyes?
Eyes are said to be the most attractive part of a person. Personality of a person is also looked upon by the eye color or the eye they inherit. Eyes have always been a question to most of us. Basically how a baby is born with a different color eye when their parents do not inherit it. It is the melanin, a brown pigment molecule that colors the skin, hair and eyes also. It is deposited in the irises of the eyes. The iris is the colored part of the eye that controls the amount of light that is allowed to enter. Some of the animals are born with blue eyes, too, like that of kittens. Melanin generally is a protein just like other proteins, the amount that is coded in our genes. An iris contains a large amount of melanin which appear black or brown. Less melanin produces green, gray, or light brown eyes. If eyes contains very small amount of melanin they will appear blue or light gray. People with albinism have no melanin in their irises and their eyes may appear pink because the blood vessels in the back of their eyes reflect light. Melanin production generally increases during the first year of baby's life, leading to a deepening of eye color. The color is often stable by about 6 months of age. However several factors can affect eye color, including use of certain medications and environmental factors. Some people experience changes in eye color over the course of their lives. People can have eyes of two colors. Even the genetics of eye color inheritance isn't as cut-and-dried as was once thought, as blue-eyed parents have been known (rarely) to have a brown-eyed child!
Glasses:
For a prefect vision: Glasses are recommended by the doctor if the vision is not perfect that is, if the person has got some eye disorder that affects the vision in general. There is a great variety of lenses and they are worn by the people for...
Dark Circles under Eyes:
Dark circle under eyes has become the most common problem every second person is found to face this problem there could be several reasons for this which might varies from person to person. It might be because of lack of sleep or because of some...
Reading Glasses -
If you have reached the point of not being able to read up close without stretching your arms past the limit, you need to turn to single-vision reading glasses. Reading glasses come mainly in two styles: full frames, in which the whole lens is made...
Spy sunglasses:
There are lots of companies in the market having the sunglasses many of them have good reputation but none competing with spy sun glasses. Spy glasses have exclusively distinct features, its performance level has been tested by world known athletes...
Replica Oakley sun glasses:
Oakley sung glasses have a long history. It was in the mid-18th century when James Ayscough began experimenting with tinted lenses in spectacles. He believed that blue- or green-tinted glass could correct specific vision impairments. Incidentally,...
|
|
|
|
|
- Eyes