Science eyes #1

• The lens is located behind the iris.
• The retina contains photoreceptor cells called rods and cones, which convert light into electrical signals that are sent to the brain via the optic nerve.
• Rods are responsible for night vision and peripheral vision, while cones are responsible for color vision and central vision.
• Eyes are animal organs that are used for sight. For example mammals have a single lens and retina which gather light and turn that light into info That the Brian can read.
• In the eye there is the Iris, culinary mussel, virtuous humour, anterior chamber, cornea, pupil, lens, choroid, retina, macula, optic nerve and optic disc
• The iris controls how much light enters the eye by changing its size. The coloured part of your eye.
• The cornea is the transparent layer at the front of the eye that refracts light. And this transparent layer tissue sits on top of the iris and pupil.
• light passing through the cornea is focused onto the retina by the lens.
• The anterior chamber is a small pocket of squid that lies between the cornea and the iris. the fluid « aqueous humour » (a watery solution that helps the cornea and pupil to focus light. And the aqueous humour helps the eye to form an image by refracting light at a constant rate.
• posterior chamber is the aqueous fluid-filled chamber between the iris and pupil.

  funcution: completes the job of focusing light
• The iris is the colored part of the eye that controls the size of the pupil and the amount of light entering the eye
• In dim light the iris dilate or expands the pupil to allow more light to enter

  in bright light the iris contracts the pupil to reduce the amount of light entering the eye
• the pupil is the opening to the inner chamber of the eye.

  It appears black because light passes through them and does not return, then it travels the eye to the retina and turns the light into signals for our brian
• the lens lies behind the pupil and focuses light onto the retina. it preforms the final focusing of the light is found inside the eye.

  it contains protein and water which refracts light at a contant rate
• The vitreous humour is a thick fluid that fills most of the eye.

  it refracts light at a constant rate.

  the jelly like thickness helps retain the shape
• Retina is a light sensitive layer of tissue that covers the back of the inner eye.

  it converts colour into new info and sends it to the Brain.
• rod cells respond to all wavlengths of visible light.
• Cone cells allow us to see colour
• optic nerve is a bundle of nerve fibres that travels from the retina to the Brain.

  it encodes image data recorded by the retina in the form of signals read by the brain