Eye and vision

Eye and vision

Our eyes resemble a TV camera. At the front is a lens called the cornea the disc in the centre of your eye. This projects a picture onto an array of light-sensitive cells.hias area Is called the retina which lines the back of your eye. The retsa then sends signals to your brain.

Why have we got two eyes?

Each eye gives a slightly different view of the same thing. The near era thing is, the greater the difference between the view. These slight differences combine in the brain to give us an impression of 3D depth and solidity, and allow you to judge easily just how far away things are.

Eyes

Your eyes eyes are two tough little balls filled with a jelly-like substance. They are very sensitive to dirt, so you blink frequently to wipe away the dust, and they are washed away by tears.

How do you see when it is dark?

In order to see well in the dark, your pupils open wider to let in more light. In the dark, it gets up to 16 times bigger. The sensitivity of the retina increases too, by up to 100,000 times. But the retina becomes less sensitive and the pupil narows in very bright light. Even so, very bright light can damage the eyes, which is why you should never look directly at the sun.

Color mix

All the colours you see are contained in white daylight. If you spin this wheel of color, the colours would mix to look white.

What are rods and cones?

Rods and cones are the two kinds of light-sensifive cells in your retina. Rods tell you how bright a light is. Cones fell you what colour it is. Rods are much more sensitive than Cones and work even in dim light. Cones do not work well in dim light, which iS why colours look grey at night.

How do you see in colour?

If was once thought that there are three kinds of cones in the eye-Some sensifive to red lignt, some to green and some fo blue. So, some scientists think you see colours simply as different mixtures of these three primary colors. Others think that there are pairs of cones sensifive to blue and yellow, red and green, and the colour you see depends on which half of the pair is stimulated most by the light.

What is in your eyeball?

Eyes are filled with a jelly- like substance called vitreous humour which is very clear to let you see well.

What are the primary colors of light?

Primary colours are three basic Colors fthat can be mixed in different proportions to make every ofther colour. The primary Colours of light are blue, green and red. But when mixing paint. you use three different primary Colours-yellow, magenta (a kind of purply red). and cyan (a greeny blue).

What is short sight?

A short-sighted person can only clearly see objects that are close fo them.

What is your iris?

It is the coloured part of the eyes is the iris. It is the ring around the dark centre or pupil of your eye It has muscles that control the size of the pupil and pigments which give your eye its colour.

Flipped flower

As rays of light focus through the cornea, they cross over. So the picture in your eye is flipped upside down though your brain see sit as normal.

 

Thank you  guys please read and watch all my post and comment in my post. I will post important contain about today science and  useful contain in our life. Thank you so much all of you

'Best of luck'