The Eye

The eye is a round shaped organ that provides us with vision. It consists of three separate tiers, the sclera, the choroid layer, and the retina, also known as the satellite layer, the middle layer and the inner layer. The sclera is the outer white layer of the eye. It gives shape to the eye and is the attachment internet site of the extrinsic muscles. The choroid layer is just inside of the sclera. It contains inventory vessels supplying the eye with nutrients and oxygen. The innermost layer is the retina. It is the most pregnant layer in the eye as it contains photoreceptor cells. The two types of photoreceptor cells be cones and rods. Cones are specialized for color vision and sharp detail, plot of ground rods are specialized for vision in dim sprightly and used to identify shapes and movements. Both the rods and cones act as the centripetal receptors. Once they are excited the nerve message is passed from the rods and cones to the bipolar cells, which then relay the message to the optic nerve, sending the pulse rate to the brain.
Inside these layers of the eye there are many structures which uphold with transmitting the visual information to the occipital lobe of the brain. The outer layer contains the cornea along with the sclera. The cornea is a transparent covering at the apparent movement of the eye which bends light towards the pupil.



Like the crystal on a watch, it gives us a clear window to port through.
The middle layer consists of the aqueous witticism, iris, vitreous humour, lens, and the pupil. The aqueous humor is the transparent fluid in a chamber bathroom the cornea which supplies it with nutrients. Near the front of the middle layer is the iris. It is made of washed-out muscle that controls the size of the pupil depending on the light availability. The brighter it is, the small the pupil is, and the darker it is, the larger the pupil gets. The pupil is located at the front of the eye as well, and is the opening into the eyeball. The pupil appears dumb because the light entering...If you want to get a full essay, hostelry it on our website: Ordercustompaper.com



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