Model Of The Eye


A Quick Description Of The Model Of The Eye
The human eye falls under the camera eyes within nature. The working together of the several parts, which form the complete model of the eye, facilitates the functioning of the eye. The coordination of these parts scopes from collecting light from the environments, regulating this light, focusing, forming of image, converting the image into signals to sending them to the brain.

  • Explicitly, the model of the eye consists of:

The cornea situates at the front part of the eye, which is transparent in a structure that regulates the focus of the light entering the eye. The focus is preset, and the cornea protects the pupil and the iris. The pupil is a circular opening, which is flexible in adjusting to lights coming through it. It expands and contracts to ensure that the needed amount of light enters the eye. The iris is membrane taking the shape of a ring. It is blue in color and controls the diameter as well as the size of the pupil. It also plays a role in regulating the quantity of light getting to the retina.

Between the cornea and the iris, settles a clear fluid known as the aqueous humor. At the back of the pupil is the crystalline lens, which is a transparent structure. Ciliary muscles hold these lenses firmly and play a role in vision. They play the role of changing the lens size. Upon relaxing, these muscles stretch flattening the lens, hence allows the eyes to see objects at varying distances. In the case of close objects, the muscles contract thus thickening the lens.

There is the eyeball’s interior chamber. This chamber consists of the vitreous humor, which is a thick jelly like liquid. It helps to keep the retina in position by ensuring it remains intact with the choroid. Light entering the aye must pass through the humor before getting to the sensitive part of the eye (retina). The retina is at the innermost of the eye. It comprises of layers of neurons, which pass images signals to the brain. The outermost layer of the eye is the sclera. It gives the eyeball the white color as in many instances. In addition, forming part of this outer layer is the cornea.

The choroid is part of the model of the eye and is between the sensitive part of the eye (retina) and the sclera. It has blood vessels, which supply the retina with both oxygen and nutrients and remove wastes. The retina also contains two types of light sensitive cells. These include the rods and cones which are photoreceptors and in numerous numbers. Rods enable vision in dim lighting. The cones, on the other hand, detect fine details of an image.

When the light entering the eye hits the cones and the rods, it undergoes conversion giving out electric signals. The optic nerves transmit these signals to the brain, which them converts them into the seeable images.
In conclusion, the model of the eye has several parts working together to achieve the overall purpose of the eye. Without one of these parts, it is then not possible for the model to run.

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