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Heterochromia means different colours. Usually the term is used to describe the condition where a person has different colored eyes — one blue eye and one green eye, for example.

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A Flow Diagram - To Show How Light Travels Inside Our Eyes

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Animal eyes

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1.   Owls are the only bird which can see the color blue.

2.  Scorpions can have as many as 12 eyes, but the box jellyfish has 24!
3.   Eagles have 1 million light-sensitive cells per square millimeter of the retina – humans only have 200,000
.Shark corneas are similar to human corneas, which is why they have been used in human transplants.

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Eyes are different colours simply because of dominant and recessive genes. Blue is recessive, Green being dominant over blue and brown being dominant over them all. This can also be explained as a punnett square.

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Eyes are different colours simply because of dominant and recessive genes. Blue is recessive, Green being dominant over blue and brown being dominant over them all. This can also be explained as a punnett square.

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Do you know what parts of your head help you see????

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Do you know what parts of your head help you see????

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a)eyes and ears
b)eyes and brain
c)nose and eyes
(leave your answer)

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The lens focuses light through the vitreous humor, a clear gel-like substance that fills the back of the eye and supports the retina. The retina receives the image that the cornea focuses through the eye's internal lens and transforms this image into electrical impulses that are carried by the optic nerve to the brain.

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When the pupil size changes, the pigments in the iris compress or spread apart, changing the eye color a bit. Certain emotions can change both the pupil size and the iris color. That's why some people say their eyes change colors when they're angry or loving. Eye color also can change with age.

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When the pupil size changes, the pigments in the iris compress or spread apart, changing the eye color a bit. Certain emotions can change both the pupil size and the iris color. That's why some people say their eyes change colors when they're angry or loving. Eye color also can change with age.

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The electrical messages from the retina travel along the optic nerve to your brain. It's a bit like the cable that carries all the TV pictures from your aerial to your TV so that you can see the programs. The great thing is that our eyes take these 'movies' all the time and we don't need any film or camera.

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The electrical messages from the retina travel along the optic nerve to your brain. It's a bit like the cable that carries all the TV pictures from your aerial to your TV so that you can see the programs. The great thing is that our eyes take these 'movies' all the time and we don't need any film or camera.

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The retina is the light-sensitive tissue that lines the inside surface of the eye, much like wallpaper. Cells in the retina convert incoming light into electrical impulses. These electrical impulses are carried by the optic nerve (which resembles your television cable) to the brain, which finally interprets them as visual images.

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Left is what we see
ight is what colour blind people see

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The lens is composed of transparent, flexible tissue and is located directly behind the iris and the pupil.  It is the second part of your eye, after the cornea, that helps to focus light and images on your retina.Because the lens is flexible and elastic, it can change its curved shape to focus on objects and people that are either nearby or at a distance.The ciliary muscles, which are part of the ciliary body, are attached to the lens and contract or release to change the lens shape and curvature. The lens becomes more rounded to focus on near objects

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The lens is composed of transparent, flexible tissue and is located directly behind the iris and the pupil.  It is the second part of your eye, after the cornea, that helps to focus light and images on your retina.Because the lens is flexible and elastic, it can change its curved shape to focus on objects and people that are either nearby or at a distance.The ciliary muscles, which are part of the ciliary body, are attached to the lens and contract or release to change the lens shape and curvature. The lens becomes more rounded to focus on near objects

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8% of the male population and 4.5% of the population of the UK as a whole are colour blind and there are estimated to be over 250 million colour blind people worldwide. The vast majority of people with a colour vision deficiency have inherited their condition from their mother, who is normally a ‘carrier’ but not colour blind herself.

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8% of the male population and 4.5% of the population of the UK as a whole are colour blind and there are estimated to be over 250 million colour blind people worldwide. The vast majority of people with a colour vision deficiency have inherited their condition from their mother, who is normally a ‘carrier’ but not colour blind herself.

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Bundle of sensory neurones at back of eye.

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The lining of the back of eye containing two types of photoreceptor cells - rods - sensitive to dim light and black and white - and cones - sensitive to colour. A small area called the fovea in the middle of the retina has many more cones than rods.

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Transparent, bi-convex, flexible disc behind the iris attached by the suspensory ligaments to the ciliary muscles.

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Roses are red and violets are blue, but we only know that thanks to specialized cells in our eyes called cones.

When light hits an object – say, a banana – the object absorbs some of the light and reflects the rest of it. Which wavelengths are reflected or absorbed depends on the properties of the object.

For a ripe banana, wavelengths of about 570 to 580 nanometers bounce back. These are the wavelengths of yellow light.

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Pigmented - decides the colour of your eyes - so light cannot pass through. Its muscles contract and relax to alter the size of its central hole or pupil.

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The iris is a tissue inside the eye that has a hole in the center called the pupil. The iris contains muscles that allow the pupil to become larger and smaller. The iris regulates the amount of light that enters your eye by adjusting the size of the pupil opening. In bright light, the iris closes and makes the pupil opening smaller to restrict the amount of light that enters your eye. The iris in bright light closes. In dim light, the iris opens and makes the pupil opening larger to increase the amount of light that enters your eye.

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The iris is a tissue inside the eye that has a hole in the center called the pupil. The iris contains muscles that allow the pupil to become larger and smaller. The iris regulates the amount of light that enters your eye by adjusting the size of the pupil opening. In bright light, the iris closes and makes the pupil opening smaller to restrict the amount of light that enters your eye. The iris in bright light closes. In dim light, the iris opens and makes the pupil opening larger to increase the amount of light that enters your eye.

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This is our page on eyes!!! We hope this helps!!

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This is our page on eyes!!! We hope this helps!!

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Colour blindness is a case where people can not see the colour in the world like we can.

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The cornea functions as a window and allows light to enter your eye. It also begins the process of focusing light rays that allow you to see words and images clearly.The cornea does not contain any blood vessels, but instead contains many nerve endings that make it extremely sensitive. That is why a scratch or a loose eyelash is so painful.

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The cornea functions as a window and allows light to enter your eye. It also begins the process of focusing light rays that allow you to see words and images clearly.The cornea does not contain any blood vessels, but instead contains many nerve endings that make it extremely sensitive. That is why a scratch or a loose eyelash is so painful.

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Front part of the tough outer coat, the sclera. It is convex and transparent.